String.Split 方法

定義

命名空間:: System

組件:: netstandard.dll, System.Runtime.dll

組件:: mscorlib.dll, System.Runtime.dll

組件:: System.Runtime.dll

組件:: mscorlib.dll

組件:: netstandard.dll

重要

部分資訊涉及發行前產品，在發行之前可能會有大幅修改。 Microsoft 對此處提供的資訊，不做任何明確或隱含的瑕疵擔保。

傳回字串數位，其中包含這個實例中由指定字串或 Unicode 字元陣列的專案分隔的子字串。

多載

名稱	Description
Split(Rune, StringSplitOptions)
Split(String[], Int32, StringSplitOptions)	根據指定的分隔字串和選擇性選項，將字串分割成子字串數目上限。
Split(Rune, Int32, StringSplitOptions)
Split(Char[], Int32, StringSplitOptions)	根據指定的分隔字元和選擇性選項，將字串分割成最大子字串數目。
Split(Char, Int32, StringSplitOptions)	根據提供的字元分隔符，將字串分割成最大子字串數目，選擇性地省略結果中的空白子字串。
Split(String[], StringSplitOptions)	根據指定的分隔字串，將字串分割成子字串串，並選擇性地將字串分割成子字串。
Split(String, Int32, StringSplitOptions)	根據指定的分隔字串，將字串分割成最大子字串數目，並選擇性地將字串分割成最大數目。
Split(Char[], StringSplitOptions)	根據指定的分隔字元和選項，將字串分割成子字串。
Split(Char[], Int32)	根據指定的分隔字元，將字串分割成最大子字串數目。
Split(Char, StringSplitOptions)	根據指定的分隔字元，將字串分割成子字串，並選擇性地將字串分割成子字串。
Split(ReadOnlySpan<Char>)	根據指定的分隔字元，將字串分割成子字串。
Split(Char[])	根據指定的分隔字元，將字串分割成子字串。
Split(String, StringSplitOptions)	將字串分割成以提供的字串分隔符為基礎的子字串。

備註

Split 用於將分隔字串拆分成子字串。您可以使用字元陣列或字串數組來指定零個或多個分隔字元或字串。如果未指定任何分隔字元，字串會分割成空格符。

方法的超載 Split 功能允許你限制方法回傳的子字串數量（方法）、 Split(Char[], Int32) 指定是否包含空字串和/或裁剪子字串（the Split(Char[], StringSplitOptions) and Split(String[], StringSplitOptions) methods），或兩者同時做（the Split(Char[], Int32, StringSplitOptions) and Split(String[], Int32, StringSplitOptions) 方法）。

提示

此 Split 方法不一定是將分隔字串拆解成子字串的最佳方式。如果你不想提取分隔字串的所有子字串，或想根據模式解析字串而非分隔字元集合，可以考慮使用正則表達式，或結合回傳字元索引的搜尋方法與該 Substring 方法。欲了解更多資訊，請參閱從字串中擷取子字串。

例

下列範例顯示三個不同的 String.Split() 重載。第一個範例呼叫過 Split(Char[]) 載，並通過一個分隔符。

string s = "You win some. You lose some.";

string[] subs = s.Split(' ');

foreach (var sub in subs)
{
    Console.WriteLine($"Substring: {sub}");
}

// This example produces the following output:
//
// Substring: You
// Substring: win
// Substring: some.
// Substring: You
// Substring: lose
// Substring: some.

let s = "You win some. You lose some."

let subs = s.Split ' '

for sub in subs do
    printfn $"Substring: {sub}"

// This example produces the following output:
//
// Substring: You
// Substring: win
// Substring: some.
// Substring: You
// Substring: lose
// Substring: some.

Dim s As String = "You win some. You lose some."
Dim subs As String() = s.Split()

For Each substring As String In subs
    Console.WriteLine($"Substring: {substring}")
Next

' This example produces the following output:
'
' Substring: You
' Substring: win
' Substring: some.
' Substring: You
' Substring: lose
' Substring: some.

如您所見，句號字元 (.) 包含在兩個子字串中。如果您想要排除句點字元，您可以將句點字元新增為額外的分隔字元。下一個範例示範如何執行這項操作。

string s = "You win some. You lose some.";

string[] subs = s.Split(' ', '.');

foreach (var sub in subs)
{
    Console.WriteLine($"Substring: {sub}");
}

// This example produces the following output:
//
// Substring: You
// Substring: win
// Substring: some
// Substring:
// Substring: You
// Substring: lose
// Substring: some
// Substring:

let s = "You win some. You lose some."

let subs = s.Split(' ', '.')

for sub in subs do
    printfn $"Substring: {sub}"

// This example produces the following output:
//
// Substring: You
// Substring: win
// Substring: some
// Substring:
// Substring: You
// Substring: lose
// Substring: some
// Substring:

Dim s As String = "You win some. You lose some."
Dim subs As String() = s.Split(" "c, "."c)

For Each substring As String In subs
    Console.WriteLine($"Substring: {substring}")
Next

' This example produces the following output:
'
' Substring: You
' Substring: win
' Substring: some
' Substring:
' Substring: You
' Substring: lose
' Substring: some
' Substring:

期間會從子字串中消失，但現在已包含兩個額外的空白子字串。這些空子字串代表單字與後面句號之間的子字串。若要從產生的陣列中省略空白子字串，您可以呼叫 Split(Char[], StringSplitOptions) 多載並指定 StringSplitOptions.RemoveEmptyEntries 做為 options 參數。

string s = "You win some. You lose some.";
char[] separators = new char[] { ' ', '.' };

string[] subs = s.Split(separators, StringSplitOptions.RemoveEmptyEntries);

foreach (var sub in subs)
{
    Console.WriteLine($"Substring: {sub}");
}

// This example produces the following output:
//
// Substring: You
// Substring: win
// Substring: some
// Substring: You
// Substring: lose
// Substring: some

let s = "You win some. You lose some."
let separators = [| ' '; '.' |]

let subs = s.Split(separators, StringSplitOptions.RemoveEmptyEntries)

for sub in subs do
    printfn $"Substring: {sub}"

// This example produces the following output:
//
// Substring: You
// Substring: win
// Substring: some
// Substring: You
// Substring: lose
// Substring: some

Dim s As String = "You win some. You lose some."
Dim separators As Char() = New Char() {" "c, "."c}
Dim subs As String() = s.Split(separators, StringSplitOptions.RemoveEmptyEntries)

For Each substring As String In subs
    Console.WriteLine($"Substring: {substring}")
Next

' This example produces the following output:
'
' Substring: You
' Substring: win
' Substring: some
' Substring: You
' Substring: lose
' Substring: some

各單元的超載 String.Split() 段落包含更多範例。

Split(Rune, StringSplitOptions)

public string[] Split(System.Text.Rune separator, StringSplitOptions options = System.StringSplitOptions.None);

member this.Split : System.Text.Rune * StringSplitOptions -> string[]

Public Function Split (separator As Rune, Optional options As StringSplitOptions = System.StringSplitOptions.None) As String()

參數

separator: Rune

options: StringSplitOptions

傳回

String[]

適用於

Split(String[], Int32, StringSplitOptions)

來源:: String.Manipulation.cs

來源:: String.Manipulation.cs

來源:: String.Manipulation.cs

來源:: String.Manipulation.cs

根據指定的分隔字串和選擇性選項，將字串分割成子字串數目上限。

public:
 cli::array <System::String ^> ^ Split(cli::array <System::String ^> ^ separator, int count, StringSplitOptions options);

public string[] Split(string[] separator, int count, StringSplitOptions options);

public string[] Split(string[]? separator, int count, StringSplitOptions options);

[System.Runtime.InteropServices.ComVisible(false)]
public string[] Split(string[] separator, int count, StringSplitOptions options);

member this.Split : string[] * int * StringSplitOptions -> string[]

[<System.Runtime.InteropServices.ComVisible(false)>]
member this.Split : string[] * int * StringSplitOptions -> string[]

Public Function Split (separator As String(), count As Integer, options As StringSplitOptions) As String()

參數

separator: String[]

分隔此字串子串的字串、不含分隔符的空陣列，或 null。

count: Int32

要傳回的子字串數目上限。

options: StringSplitOptions

列舉值的位元組合，指定是否要修剪子字串並包含空子字串。

傳回

String[]

一個陣列，其元素包含該字串中由一個或多個字串 separator分隔的子字串。如需詳細資訊，請參閱一節。

屬性: ComVisibleAttribute

例外狀況

ArgumentOutOfRangeException

count 是負的。

ArgumentException

options 不是其中 StringSplitOptions 的價值觀之一。

範例

以下範例利用 StringSplitOptions 列舉來包含或排除由 Split 該方法產生的子字串。

// This example demonstrates the String.Split() methods that use
// the StringSplitOptions enumeration.

// Example 1: Split a string delimited by characters
Console.WriteLine("1) Split a string delimited by characters:\n");

string s1 = ",ONE,, TWO,, , THREE,,";
char[] charSeparators = new char[] { ',' };
string[] result;

Console.WriteLine($"The original string is: \"{s1}\".");
Console.WriteLine($"The delimiter character is: '{charSeparators[0]}'.\n");

// Split the string and return all elements
Console.WriteLine("1a) Return all elements:");
result = s1.Split(charSeparators, StringSplitOptions.None);
Show(result);

// Split the string and return all elements with whitespace trimmed
Console.WriteLine("1b) Return all elements with whitespace trimmed:");
result = s1.Split(charSeparators, StringSplitOptions.TrimEntries);
Show(result);

// Split the string and return all non-empty elements
Console.WriteLine("1c) Return all non-empty elements:");
result = s1.Split(charSeparators, StringSplitOptions.RemoveEmptyEntries);
Show(result);

// Split the string and return all non-whitespace elements with whitespace trimmed
Console.WriteLine("1d) Return all non-whitespace elements with whitespace trimmed:");
result = s1.Split(charSeparators, StringSplitOptions.RemoveEmptyEntries | StringSplitOptions.TrimEntries);
Show(result);


// Split the string into only two elements, keeping the remainder in the last match
Console.WriteLine("1e) Split into only two elements:");
result = s1.Split(charSeparators, 2, StringSplitOptions.None);
Show(result);

// Split the string into only two elements with whitespace trimmed, keeping the remainder in the last match
Console.WriteLine("1f) Split into only two elements with whitespace trimmed:");
result = s1.Split(charSeparators, 2, StringSplitOptions.TrimEntries);
Show(result);

// Split the string into only two non-empty elements, keeping the remainder in the last match
Console.WriteLine("1g) Split into only two non-empty elements:");
result = s1.Split(charSeparators, 2, StringSplitOptions.RemoveEmptyEntries);
Show(result);

// Split the string into only two non-whitespace elements with whitespace trimmed, keeping the remainder in the last match
Console.WriteLine("1h) Split into only two non-whitespace elements with whitespace trimmed:");
result = s1.Split(charSeparators, 2, StringSplitOptions.RemoveEmptyEntries | StringSplitOptions.TrimEntries);
Show(result);


// Example 2: Split a string delimited by another string
Console.WriteLine("2) Split a string delimited by another string:\n");

string s2 = "[stop]" +
            "ONE[stop] [stop]" +
            "TWO  [stop][stop]  [stop]" +
            "THREE[stop][stop]  ";
string[] stringSeparators = new string[] { "[stop]" };

Console.WriteLine($"The original string is: \"{s2}\".");
Console.WriteLine($"The delimiter string is: \"{stringSeparators[0]}\".\n");

// Split the string and return all elements
Console.WriteLine("2a) Return all elements:");
result = s2.Split(stringSeparators, StringSplitOptions.None);
Show(result);

// Split the string and return all elements with whitespace trimmed
Console.WriteLine("2b) Return all elements with whitespace trimmed:");
result = s2.Split(stringSeparators, StringSplitOptions.TrimEntries);
Show(result);

// Split the string and return all non-empty elements
Console.WriteLine("2c) Return all non-empty elements:");
result = s2.Split(stringSeparators, StringSplitOptions.RemoveEmptyEntries);
Show(result);

// Split the string and return all non-whitespace elements with whitespace trimmed
Console.WriteLine("2d) Return all non-whitespace elements with whitespace trimmed:");
result = s2.Split(stringSeparators, StringSplitOptions.RemoveEmptyEntries | StringSplitOptions.TrimEntries);
Show(result);


// Split the string into only two elements, keeping the remainder in the last match
Console.WriteLine("2e) Split into only two elements:");
result = s2.Split(stringSeparators, 2, StringSplitOptions.None);
Show(result);

// Split the string into only two elements with whitespace trimmed, keeping the remainder in the last match
Console.WriteLine("2f) Split into only two elements with whitespace trimmed:");
result = s2.Split(stringSeparators, 2, StringSplitOptions.TrimEntries);
Show(result);

// Split the string into only two non-empty elements, keeping the remainder in the last match
Console.WriteLine("2g) Split into only two non-empty elements:");
result = s2.Split(stringSeparators, 2, StringSplitOptions.RemoveEmptyEntries);
Show(result);

// Split the string into only two non-whitespace elements with whitespace trimmed, keeping the remainder in the last match
Console.WriteLine("2h) Split into only two non-whitespace elements with whitespace trimmed:");
result = s2.Split(stringSeparators, 2, StringSplitOptions.RemoveEmptyEntries | StringSplitOptions.TrimEntries);
Show(result);


// Display the array of separated strings using a local function
void Show(string[] entries)
{
    Console.WriteLine($"The return value contains these {entries.Length} elements:");
    foreach (string entry in entries)
    {
        Console.Write($"<{entry}>");
    }
    Console.Write("\n\n");
}

/*
This example produces the following results:

1) Split a string delimited by characters:

The original string is: ",ONE,, TWO,, , THREE,,".
The delimiter character is: ','.

1a) Return all elements:
The return value contains these 9 elements:
<><ONE><>< TWO><>< >< THREE><><>

1b) Return all elements with whitespace trimmed:
The return value contains these 9 elements:
<><ONE><><TWO><><><THREE><><>

1c) Return all non-empty elements:
The return value contains these 4 elements:
<ONE>< TWO>< >< THREE>

1d) Return all non-whitespace elements with whitespace trimmed:
The return value contains these 3 elements:
<ONE><TWO><THREE>

1e) Split into only two elements:
The return value contains these 2 elements:
<><ONE,, TWO,, , THREE,,>

1f) Split into only two elements with whitespace trimmed:
The return value contains these 2 elements:
<><ONE,, TWO,, , THREE,,>

1g) Split into only two non-empty elements:
The return value contains these 2 elements:
<ONE>< TWO,, , THREE,,>

1h) Split into only two non-whitespace elements with whitespace trimmed:
The return value contains these 2 elements:
<ONE><TWO,, , THREE,,>

2) Split a string delimited by another string:

The original string is: "[stop]ONE[stop] [stop]TWO  [stop][stop]  [stop]THREE[stop][stop]  ".
The delimiter string is: "[stop]".

2a) Return all elements:
The return value contains these 9 elements:
<><ONE>< ><TWO  ><><  ><THREE><><  >

2b) Return all elements with whitespace trimmed:
The return value contains these 9 elements:
<><ONE><><TWO><><><THREE><><>

2c) Return all non-empty elements:
The return value contains these 6 elements:
<ONE>< ><TWO  ><  ><THREE><  >

2d) Return all non-whitespace elements with whitespace trimmed:
The return value contains these 3 elements:
<ONE><TWO><THREE>

2e) Split into only two elements:
The return value contains these 2 elements:
<><ONE[stop] [stop]TWO  [stop][stop]  [stop]THREE[stop][stop]  >

2f) Split into only two elements with whitespace trimmed:
The return value contains these 2 elements:
<><ONE[stop] [stop]TWO  [stop][stop]  [stop]THREE[stop][stop]>

2g) Split into only two non-empty elements:
The return value contains these 2 elements:
<ONE>< [stop]TWO  [stop][stop]  [stop]THREE[stop][stop]  >

2h) Split into only two non-whitespace elements with whitespace trimmed:
The return value contains these 2 elements:
<ONE><TWO  [stop][stop]  [stop]THREE[stop][stop]>

*/

// This example demonstrates the String.Split() methods that use
// the StringSplitOptions enumeration.

// Display the array of separated strings using a local function
let show  (entries: string[]) =
    printfn $"The return value contains these {entries.Length} elements:"
    for entry in entries do
        printf $"<{entry}>"
    printf "\n\n"

// Example 1: Split a string delimited by characters
printfn "1) Split a string delimited by characters:\n"

let s1 = ",ONE,, TWO,, , THREE,,"
let charSeparators = [| ',' |]

printfn $"The original string is: \"{s1}\"."
printfn $"The delimiter character is: '{charSeparators[0]}'.\n"

// Split the string and return all elements
printfn "1a) Return all elements:"
let result = s1.Split(charSeparators, StringSplitOptions.None)
show result

// Split the string and return all elements with whitespace trimmed
printfn "1b) Return all elements with whitespace trimmed:"
let result = s1.Split(charSeparators, StringSplitOptions.TrimEntries)
show result

// Split the string and return all non-empty elements
printfn "1c) Return all non-empty elements:"
let result = s1.Split(charSeparators, StringSplitOptions.RemoveEmptyEntries)
show result

// Split the string and return all non-whitespace elements with whitespace trimmed
printfn "1d) Return all non-whitespace elements with whitespace trimmed:"
let result = s1.Split(charSeparators, StringSplitOptions.RemoveEmptyEntries ||| StringSplitOptions.TrimEntries)
show result


// Split the string into only two elements, keeping the remainder in the last match
printfn "1e) Split into only two elements:"
let result = s1.Split(charSeparators, 2, StringSplitOptions.None)
show result

// Split the string into only two elements with whitespace trimmed, keeping the remainder in the last match
printfn "1f) Split into only two elements with whitespace trimmed:"
let result = s1.Split(charSeparators, 2, StringSplitOptions.TrimEntries)
show result

// Split the string into only two non-empty elements, keeping the remainder in the last match
printfn "1g) Split into only two non-empty elements:"
let result = s1.Split(charSeparators, 2, StringSplitOptions.RemoveEmptyEntries)
show result

// Split the string into only two non-whitespace elements with whitespace trimmed, keeping the remainder in the last match
printfn "1h) Split into only two non-whitespace elements with whitespace trimmed:"
let result = s1.Split(charSeparators, 2, StringSplitOptions.RemoveEmptyEntries ||| StringSplitOptions.TrimEntries)
show result


// Example 2: Split a string delimited by another string
printfn "2) Split a string delimited by another string:\n"

let s2 = "[stop]" +
            "ONE[stop] [stop]" +
            "TWO  [stop][stop]  [stop]" +
            "THREE[stop][stop]  "
let stringSeparators = [| "[stop]" |]

printfn $"The original string is: \"{s2}\"."
printfn $"The delimiter string is: \"{stringSeparators[0]}\".\n"

// Split the string and return all elements
printfn "2a) Return all elements:"
let result = s2.Split(stringSeparators, StringSplitOptions.None)
show result

// Split the string and return all elements with whitespace trimmed
printfn "2b) Return all elements with whitespace trimmed:"
let result = s2.Split(stringSeparators, StringSplitOptions.TrimEntries)
show result

// Split the string and return all non-empty elements
printfn "2c) Return all non-empty elements:"
let result = s2.Split(stringSeparators, StringSplitOptions.RemoveEmptyEntries)
show result

// Split the string and return all non-whitespace elements with whitespace trimmed
printfn "2d) Return all non-whitespace elements with whitespace trimmed:"
let result = s2.Split(stringSeparators, StringSplitOptions.RemoveEmptyEntries ||| StringSplitOptions.TrimEntries)
show result


// Split the string into only two elements, keeping the remainder in the last match
printfn "2e) Split into only two elements:"
let result = s2.Split(stringSeparators, 2, StringSplitOptions.None)
show result

// Split the string into only two elements with whitespace trimmed, keeping the remainder in the last match
printfn "2f) Split into only two elements with whitespace trimmed:"
let result = s2.Split(stringSeparators, 2, StringSplitOptions.TrimEntries)
show result

// Split the string into only two non-empty elements, keeping the remainder in the last match
printfn "2g) Split into only two non-empty elements:"
let result = s2.Split(stringSeparators, 2, StringSplitOptions.RemoveEmptyEntries)
show result

// Split the string into only two non-whitespace elements with whitespace trimmed, keeping the remainder in the last match
printfn "2h) Split into only two non-whitespace elements with whitespace trimmed:"
let result = s2.Split(stringSeparators, 2, StringSplitOptions.RemoveEmptyEntries ||| StringSplitOptions.TrimEntries)
show result

(*
This example produces the following results:

1) Split a string delimited by characters:

The original string is: ",ONE,, TWO,, , THREE,,".
The delimiter character is: ','.

1a) Return all elements:
The return value contains these 9 elements:
<><ONE><>< TWO><>< >< THREE><><>

1b) Return all elements with whitespace trimmed:
The return value contains these 9 elements:
<><ONE><><TWO><><><THREE><><>

1c) Return all non-empty elements:
The return value contains these 4 elements:
<ONE>< TWO>< >< THREE>

1d) Return all non-whitespace elements with whitespace trimmed:
The return value contains these 3 elements:
<ONE><TWO><THREE>

1e) Split into only two elements:
The return value contains these 2 elements:
<><ONE,, TWO,, , THREE,,>

1f) Split into only two elements with whitespace trimmed:
The return value contains these 2 elements:
<><ONE,, TWO,, , THREE,,>

1g) Split into only two non-empty elements:
The return value contains these 2 elements:
<ONE>< TWO,, , THREE,,>

1h) Split into only two non-whitespace elements with whitespace trimmed:
The return value contains these 2 elements:
<ONE><TWO,, , THREE,,>

2) Split a string delimited by another string:

The original string is: "[stop]ONE[stop] [stop]TWO  [stop][stop]  [stop]THREE[stop][stop]  ".
The delimiter string is: "[stop]".

2a) Return all elements:
The return value contains these 9 elements:
<><ONE>< ><TWO  ><><  ><THREE><><  >

2b) Return all elements with whitespace trimmed:
The return value contains these 9 elements:
<><ONE><><TWO><><><THREE><><>

2c) Return all non-empty elements:
The return value contains these 6 elements:
<ONE>< ><TWO  ><  ><THREE><  >

2d) Return all non-whitespace elements with whitespace trimmed:
The return value contains these 3 elements:
<ONE><TWO><THREE>

2e) Split into only two elements:
The return value contains these 2 elements:
<><ONE[stop] [stop]TWO  [stop][stop]  [stop]THREE[stop][stop]  >

2f) Split into only two elements with whitespace trimmed:
The return value contains these 2 elements:
<><ONE[stop] [stop]TWO  [stop][stop]  [stop]THREE[stop][stop]>

2g) Split into only two non-empty elements:
The return value contains these 2 elements:
<ONE>< [stop]TWO  [stop][stop]  [stop]THREE[stop][stop]  >

2h) Split into only two non-whitespace elements with whitespace trimmed:
The return value contains these 2 elements:
<ONE><TWO  [stop][stop]  [stop]THREE[stop][stop]>

*)

Public Shared Sub StringSplitOptionsExamples()
    ' This example demonstrates the String.Split() methods that use
    ' the StringSplitOptions enumeration.

    ' Example 1: Split a string delimited by characters
    Console.WriteLine("1) Split a string delimited by characters:" & vbCrLf)

    Dim s1 As String = ",ONE,, TWO,, , THREE,,"
    Dim charSeparators() As Char = {","c}
    Dim result() As String

    Console.WriteLine("The original string is: ""{0}"".", s1)
    Console.WriteLine("The delimiter character is: '{0}'." & vbCrLf, charSeparators(0))

    ' Split the string and return all elements
    Console.WriteLine("1a) Return all elements:")
    result = s1.Split(charSeparators, StringSplitOptions.None)
    Show(result)

    ' Split the string and return all elements with whitespace trimmed
    Console.WriteLine("1b) Return all elements with whitespace trimmed:")
    result = s1.Split(charSeparators, StringSplitOptions.TrimEntries)
    Show(result)

    ' Split the string and return all non-empty elements
    Console.WriteLine("1c) Return all non-empty elements:")
    result = s1.Split(charSeparators, StringSplitOptions.RemoveEmptyEntries)
    Show(result)

    ' Split the string and return all non-whitespace elements with whitespace trimmed
    Console.WriteLine("1d) Return all non-whitespace elements with whitespace trimmed:")
    result = s1.Split(charSeparators, StringSplitOptions.RemoveEmptyEntries Or StringSplitOptions.TrimEntries)
    Show(result)


    ' Split the string into only two elements, keeping the remainder in the last match
    Console.WriteLine("1e) Split into only two elements:")
    result = s1.Split(charSeparators, 2, StringSplitOptions.None)
    Show(result)

    ' Split the string into only two elements with whitespace trimmed, keeping the remainder in the last match
    Console.WriteLine("1f) Split into only two elements with whitespace trimmed:")
    result = s1.Split(charSeparators, 2, StringSplitOptions.TrimEntries)
    Show(result)

    ' Split the string into only two non-empty elements, keeping the remainder in the last match
    Console.WriteLine("1g) Split into only two non-empty elements:")
    result = s1.Split(charSeparators, 2, StringSplitOptions.RemoveEmptyEntries)
    Show(result)

    ' Split the string into only two non-whitespace elements with whitespace trimmed, keeping the remainder in the last match
    Console.WriteLine("1h) Split into only two non-whitespace elements with whitespace trimmed:")
    result = s1.Split(charSeparators, 2, StringSplitOptions.RemoveEmptyEntries Or StringSplitOptions.TrimEntries)
    Show(result)


    ' Example 2: Split a string delimited by another string
    Console.WriteLine("2) Split a string delimited by another string:" & vbCrLf)

    Dim s2 As String = "[stop]" +
                "ONE[stop] [stop]" +
                "TWO  [stop][stop]  [stop]" +
                "THREE[stop][stop]  "
    Dim stringSeparators() As String = {"[stop]"}


    Console.WriteLine("The original string is: ""{0}"".", s2)
    Console.WriteLine("The delimiter string is: ""{0}""." & vbCrLf, stringSeparators(0))

    ' Split the string and return all elements
    Console.WriteLine("2a) Return all elements:")
    result = s2.Split(stringSeparators, StringSplitOptions.None)
    Show(result)

    ' Split the string and return all elements with whitespace trimmed
    Console.WriteLine("2b) Return all elements with whitespace trimmed:")
    result = s2.Split(stringSeparators, StringSplitOptions.TrimEntries)
    Show(result)

    ' Split the string and return all non-empty elements
    Console.WriteLine("2c) Return all non-empty elements:")
    result = s2.Split(stringSeparators, StringSplitOptions.RemoveEmptyEntries)
    Show(result)

    ' Split the string and return all non-whitespace elements with whitespace trimmed
    Console.WriteLine("2d) Return all non-whitespace elements with whitespace trimmed:")
    result = s2.Split(stringSeparators, StringSplitOptions.RemoveEmptyEntries Or StringSplitOptions.TrimEntries)
    Show(result)


    ' Split the string into only two elements, keeping the remainder in the last match
    Console.WriteLine("2e) Split into only two elements:")
    result = s2.Split(stringSeparators, 2, StringSplitOptions.None)
    Show(result)

    ' Split the string into only two elements with whitespace trimmed, keeping the remainder in the last match
    Console.WriteLine("2f) Split into only two elements with whitespace trimmed:")
    result = s2.Split(stringSeparators, 2, StringSplitOptions.TrimEntries)
    Show(result)

    ' Split the string into only two non-empty elements, keeping the remainder in the last match
    Console.WriteLine("2g) Split into only two non-empty elements:")
    result = s2.Split(stringSeparators, 2, StringSplitOptions.RemoveEmptyEntries)
    Show(result)

    ' Split the string into only two non-whitespace elements with whitespace trimmed, keeping the remainder in the last match
    Console.WriteLine("2h) Split into only two non-whitespace elements with whitespace trimmed:")
    result = s2.Split(stringSeparators, 2, StringSplitOptions.RemoveEmptyEntries Or StringSplitOptions.TrimEntries)
    Show(result)

End Sub

' Display the array of separated strings.
Public Shared Sub Show(ByVal entries() As String)
    Console.WriteLine("The return value contains these {0} elements:", entries.Length)
    Dim entry As String
    For Each entry In entries
        Console.Write("<{0}>", entry)
    Next entry
    Console.Write(vbCrLf & vbCrLf)

End Sub

'This example produces the following results:
'
' 1) Split a string delimited by characters:
'
' The original string is: ",ONE,, TWO,, , THREE,,".
' The delimiter character is: ','.
'
' 1a) Return all elements:
' The return value contains these 9 elements:
' <><ONE><>< TWO><>< >< THREE><><>
'
' 1b) Return all elements with whitespace trimmed:
' The return value contains these 9 elements:
' <><ONE><><TWO><><><THREE><><>
'
' 1c) Return all non-empty elements:
' The return value contains these 4 elements:
' <ONE>< TWO>< >< THREE>
'
' 1d) Return all non-whitespace elements with whitespace trimmed:
' The return value contains these 3 elements:
' <ONE><TWO><THREE>
'
' 1e) Split into only two elements:
' The return value contains these 2 elements:
' <><ONE,, TWO,, , THREE,,>
'
' 1f) Split into only two elements with whitespace trimmed:
' The return value contains these 2 elements:
' <><ONE,, TWO,, , THREE,,>
'
' 1g) Split into only two non-empty elements:
' The return value contains these 2 elements:
' <ONE>< TWO,, , THREE,,>
'
' 1h) Split into only two non-whitespace elements with whitespace trimmed:
' The return value contains these 2 elements:
' <ONE><TWO,, , THREE,,>
'
' 2) Split a string delimited by another string:
'
' The original string is: "[stop]ONE[stop] [stop]TWO  [stop][stop]  [stop]THREE[stop][stop]  ".
' The delimiter string is: "[stop]".
'
' 2a) Return all elements:
' The return value contains these 9 elements:
' <><ONE>< ><TWO  ><><  ><THREE><><  >
'
' 2b) Return all elements with whitespace trimmed:
' The return value contains these 9 elements:
' <><ONE><><TWO><><><THREE><><>
'
' 2c) Return all non-empty elements:
' The return value contains these 6 elements:
' <ONE>< ><TWO  ><  ><THREE><  >
'
' 2d) Return all non-whitespace elements with whitespace trimmed:
' The return value contains these 3 elements:
' <ONE><TWO><THREE>
'
' 2e) Split into only two elements:
' The return value contains these 2 elements:
' <><ONE[stop] [stop]TWO  [stop][stop]  [stop]THREE[stop][stop]  >
'
' 2f) Split into only two elements with whitespace trimmed:
' The return value contains these 2 elements:
' <><ONE[stop] [stop]TWO  [stop][stop]  [stop]THREE[stop][stop]>
'
' 2g) Split into only two non-empty elements:
' The return value contains these 2 elements:
' <ONE>< [stop]TWO  [stop][stop]  [stop]THREE[stop][stop]  >
'
' 2h) Split into only two non-whitespace elements with whitespace trimmed:
' The return value contains these 2 elements:
' <ONE><TWO  [stop][stop]  [stop]THREE[stop][stop]>
'

備註

傳回數位的元素中不包含分隔符字串。

若此實例不包含中 separator的任何字串，或 count 參數為 1，回傳陣列將由包含該實例的單一元素組成。

若 separator 參數為 null 或不包含任何字元，則假設空白字元為分隔符。空白字元由 Unicode 標準定義， Char.IsWhiteSpace 若被傳遞，方法會回傳 true 。

要通過 null 參數 string[] separator ，必須指定的 null 類型，以區分呼叫與其他過載，例如 Split(Char[], Int32, StringSplitOptions)。下列範例示範數種方式來明確識別此多載。

string phrase = "The quick  brown fox";

_ = phrase.Split(default(string[]), 3, StringSplitOptions.RemoveEmptyEntries);

_ = phrase.Split((string[]?)null, 3, StringSplitOptions.RemoveEmptyEntries);

_ = phrase.Split(null as string[], 3, StringSplitOptions.RemoveEmptyEntries);

let phrase = "The quick  brown fox"

phrase.Split(Unchecked.defaultof<string[]>, 3, StringSplitOptions.RemoveEmptyEntries) |> ignore

phrase.Split(null :> string[], 3, StringSplitOptions.RemoveEmptyEntries) |> ignore

phrase.Split((null: string[]), 3, StringSplitOptions.RemoveEmptyEntries) |> ignore

Dim phrase As String = "The quick brown fox"
Dim words() As String

words = phrase.Split(TryCast(Nothing, String()), 3,
                       StringSplitOptions.RemoveEmptyEntries)

words = phrase.Split(New String() {}, 3,
                     StringSplitOptions.RemoveEmptyEntries)

若 count 參數為零，或 options 參數為 RemoveEmptyEntries 且實例長度為零，則回傳一個空陣列。

每個 separator 元素定義一個由一個或多個字元組成的獨立分隔符。若 options 參數為 None，且兩個分隔符相鄰，或在本實例的開始或結尾找到分隔符，則對應的陣列元素包含 Empty。

若此實例中子串超過 count 數，首 count 個負 1 子串會回傳回傳值的前 count -1 元素，剩餘字元則回傳回返回值的最後一個元素。

若 count 大於子字串數量，則回傳可用子字串，且不拋出例外。

分隔符陣列

若中 separator 任一元素包含多個字元，整個子串即視為分隔符。例如，若中的 separator 某個元素是「10」，嘗試拆分字串「This10is10a10string.」會回傳這個四元素陣列：{ 「This」、「is」、「a」、「string.」}。

比較詳細數據

該方法會 Split 擷取由參數中 separator 一個或多個字串分隔的子字串，並將這些子字串作為陣列的元素回傳。

此 Split 方法透過使用大小寫區分序數排序規則進行比較來尋找分隔符。欲了解更多關於字、字串及序數排序的資訊，請參閱列舉。System.Globalization.CompareOptions

此Split方法忽略值為 null 的separator元素或空字串（“”）。

為了避免當字 separator 串有共同字元時產生歧義，該 Split 方法從實例值的開始到結束，並匹配該實例中等於分隔符的第一個元素 separator 。子串在實例中遇到的順序優先於元素的順序 separator。

例如，請考慮值為「abcdef」的實例。若的 separator 第一個元素是「ef」，第二個元素是「bcde」，則分割運算的結果會是「a」和「f」。這是因為實例中的子字串「bcde」在子字串「f」出現之前，已經與中的 separator 元素相匹配。

然而，若的 separator 第一個元素為「bcd」，第二個元素為「bc」，則分割運算的結果為「a」與「ef」。這是因為「bcd」是第一個與該實例中分隔符相符的分隔符 separator 。如果分隔符的順序反轉，因此第一個元素是 “bc”，而第二個元素是 “bcd”，則結果會是 “a” 和 “def”。

效能考慮

這些方法會 Split 為回傳的陣列物件分配記憶體，並為每個陣列元素分配一個 String 物件。如果您的應用程式需要最佳效能，或記憶體配置管理對應用程式至關重要，請考慮使用 IndexOf or 方法，亦可選擇Compare使用 method IndexOfAny 來定位字串中的子字串。

如果你在分隔字元處拆分字串，請使用 IndexOf or IndexOfAny 方法來定位字串中的分隔字元。如果你在分隔字串處拆分字串，請使用 IndexOf or IndexOfAny 方法來定位分隔字串的第一個字元。接著用該 Compare 方法判斷該第一個字元後面的字元是否等於分隔字串的其餘字元。

此外，若在多個 Split 方法呼叫中使用相同一組字元來拆分字串，建議建立單一陣列並在每個方法呼叫中引用該陣列。這可大幅減少每個方法呼叫的額外額外負荷。

給呼叫者的注意事項

在 .NET Framework 3.5 及更早版本中，如果 Split(Char[]) 方法傳遞的 a separatornull 是或不包含任何字元，方法會使用一組與方法剪裁字串的空白字元 Trim(Char[]) 集合略有不同。從 .NET Framework 4 開始，這兩種方法都會使用相同的 Unicode 空格符集。

適用於

Split(Rune, Int32, StringSplitOptions)

public string[] Split(System.Text.Rune separator, int count, StringSplitOptions options = System.StringSplitOptions.None);

member this.Split : System.Text.Rune * int * StringSplitOptions -> string[]

Public Function Split (separator As Rune, count As Integer, Optional options As StringSplitOptions = System.StringSplitOptions.None) As String()

參數

separator: Rune

count: Int32

options: StringSplitOptions

傳回

String[]

適用於

Split(Char[], Int32, StringSplitOptions)

來源:: String.Manipulation.cs

來源:: String.Manipulation.cs

來源:: String.Manipulation.cs

來源:: String.Manipulation.cs

根據指定的分隔字元和選擇性選項，將字串分割成最大子字串數目。

public:
 cli::array <System::String ^> ^ Split(cli::array <char> ^ separator, int count, StringSplitOptions options);

public string[] Split(char[] separator, int count, StringSplitOptions options);

public string[] Split(char[]? separator, int count, StringSplitOptions options);

[System.Runtime.InteropServices.ComVisible(false)]
public string[] Split(char[] separator, int count, StringSplitOptions options);

member this.Split : char[] * int * StringSplitOptions -> string[]

[<System.Runtime.InteropServices.ComVisible(false)>]
member this.Split : char[] * int * StringSplitOptions -> string[]

Public Function Split (separator As Char(), count As Integer, options As StringSplitOptions) As String()

參數

separator: Char[]

一個用來分隔該字串子串的字元陣列、一個不含分隔符的空陣列，或 null是。

count: Int32

要傳回的子字串數目上限。

options: StringSplitOptions

列舉值的位元組合，指定是否要修剪子字串並包含空子字串。

傳回

String[]

一個陣列，包含此字串中由一個或多個字元 separator分隔的子串。如需詳細資訊，請參閱一節。

屬性: ComVisibleAttribute

例外狀況

ArgumentOutOfRangeException

count 是負的。

ArgumentException

options 不是其中 StringSplitOptions 的價值觀之一。

範例

以下範例利用 StringSplitOptions 列舉來包含或排除由 Split 該方法產生的子字串。

// This example demonstrates the String.Split() methods that use
// the StringSplitOptions enumeration.

// Example 1: Split a string delimited by characters
Console.WriteLine("1) Split a string delimited by characters:\n");

string s1 = ",ONE,, TWO,, , THREE,,";
char[] charSeparators = new char[] { ',' };
string[] result;

Console.WriteLine($"The original string is: \"{s1}\".");
Console.WriteLine($"The delimiter character is: '{charSeparators[0]}'.\n");

// Split the string and return all elements
Console.WriteLine("1a) Return all elements:");
result = s1.Split(charSeparators, StringSplitOptions.None);
Show(result);

// Split the string and return all elements with whitespace trimmed
Console.WriteLine("1b) Return all elements with whitespace trimmed:");
result = s1.Split(charSeparators, StringSplitOptions.TrimEntries);
Show(result);

// Split the string and return all non-empty elements
Console.WriteLine("1c) Return all non-empty elements:");
result = s1.Split(charSeparators, StringSplitOptions.RemoveEmptyEntries);
Show(result);

// Split the string and return all non-whitespace elements with whitespace trimmed
Console.WriteLine("1d) Return all non-whitespace elements with whitespace trimmed:");
result = s1.Split(charSeparators, StringSplitOptions.RemoveEmptyEntries | StringSplitOptions.TrimEntries);
Show(result);


// Split the string into only two elements, keeping the remainder in the last match
Console.WriteLine("1e) Split into only two elements:");
result = s1.Split(charSeparators, 2, StringSplitOptions.None);
Show(result);

// Split the string into only two elements with whitespace trimmed, keeping the remainder in the last match
Console.WriteLine("1f) Split into only two elements with whitespace trimmed:");
result = s1.Split(charSeparators, 2, StringSplitOptions.TrimEntries);
Show(result);

// Split the string into only two non-empty elements, keeping the remainder in the last match
Console.WriteLine("1g) Split into only two non-empty elements:");
result = s1.Split(charSeparators, 2, StringSplitOptions.RemoveEmptyEntries);
Show(result);

// Split the string into only two non-whitespace elements with whitespace trimmed, keeping the remainder in the last match
Console.WriteLine("1h) Split into only two non-whitespace elements with whitespace trimmed:");
result = s1.Split(charSeparators, 2, StringSplitOptions.RemoveEmptyEntries | StringSplitOptions.TrimEntries);
Show(result);


// Example 2: Split a string delimited by another string
Console.WriteLine("2) Split a string delimited by another string:\n");

string s2 = "[stop]" +
            "ONE[stop] [stop]" +
            "TWO  [stop][stop]  [stop]" +
            "THREE[stop][stop]  ";
string[] stringSeparators = new string[] { "[stop]" };

Console.WriteLine($"The original string is: \"{s2}\".");
Console.WriteLine($"The delimiter string is: \"{stringSeparators[0]}\".\n");

// Split the string and return all elements
Console.WriteLine("2a) Return all elements:");
result = s2.Split(stringSeparators, StringSplitOptions.None);
Show(result);

// Split the string and return all elements with whitespace trimmed
Console.WriteLine("2b) Return all elements with whitespace trimmed:");
result = s2.Split(stringSeparators, StringSplitOptions.TrimEntries);
Show(result);

// Split the string and return all non-empty elements
Console.WriteLine("2c) Return all non-empty elements:");
result = s2.Split(stringSeparators, StringSplitOptions.RemoveEmptyEntries);
Show(result);

// Split the string and return all non-whitespace elements with whitespace trimmed
Console.WriteLine("2d) Return all non-whitespace elements with whitespace trimmed:");
result = s2.Split(stringSeparators, StringSplitOptions.RemoveEmptyEntries | StringSplitOptions.TrimEntries);
Show(result);


// Split the string into only two elements, keeping the remainder in the last match
Console.WriteLine("2e) Split into only two elements:");
result = s2.Split(stringSeparators, 2, StringSplitOptions.None);
Show(result);

// Split the string into only two elements with whitespace trimmed, keeping the remainder in the last match
Console.WriteLine("2f) Split into only two elements with whitespace trimmed:");
result = s2.Split(stringSeparators, 2, StringSplitOptions.TrimEntries);
Show(result);

// Split the string into only two non-empty elements, keeping the remainder in the last match
Console.WriteLine("2g) Split into only two non-empty elements:");
result = s2.Split(stringSeparators, 2, StringSplitOptions.RemoveEmptyEntries);
Show(result);

// Split the string into only two non-whitespace elements with whitespace trimmed, keeping the remainder in the last match
Console.WriteLine("2h) Split into only two non-whitespace elements with whitespace trimmed:");
result = s2.Split(stringSeparators, 2, StringSplitOptions.RemoveEmptyEntries | StringSplitOptions.TrimEntries);
Show(result);


// Display the array of separated strings using a local function
void Show(string[] entries)
{
    Console.WriteLine($"The return value contains these {entries.Length} elements:");
    foreach (string entry in entries)
    {
        Console.Write($"<{entry}>");
    }
    Console.Write("\n\n");
}

/*
This example produces the following results:

1) Split a string delimited by characters:

The original string is: ",ONE,, TWO,, , THREE,,".
The delimiter character is: ','.

1a) Return all elements:
The return value contains these 9 elements:
<><ONE><>< TWO><>< >< THREE><><>

1b) Return all elements with whitespace trimmed:
The return value contains these 9 elements:
<><ONE><><TWO><><><THREE><><>

1c) Return all non-empty elements:
The return value contains these 4 elements:
<ONE>< TWO>< >< THREE>

1d) Return all non-whitespace elements with whitespace trimmed:
The return value contains these 3 elements:
<ONE><TWO><THREE>

1e) Split into only two elements:
The return value contains these 2 elements:
<><ONE,, TWO,, , THREE,,>

1f) Split into only two elements with whitespace trimmed:
The return value contains these 2 elements:
<><ONE,, TWO,, , THREE,,>

1g) Split into only two non-empty elements:
The return value contains these 2 elements:
<ONE>< TWO,, , THREE,,>

1h) Split into only two non-whitespace elements with whitespace trimmed:
The return value contains these 2 elements:
<ONE><TWO,, , THREE,,>

2) Split a string delimited by another string:

The original string is: "[stop]ONE[stop] [stop]TWO  [stop][stop]  [stop]THREE[stop][stop]  ".
The delimiter string is: "[stop]".

2a) Return all elements:
The return value contains these 9 elements:
<><ONE>< ><TWO  ><><  ><THREE><><  >

2b) Return all elements with whitespace trimmed:
The return value contains these 9 elements:
<><ONE><><TWO><><><THREE><><>

2c) Return all non-empty elements:
The return value contains these 6 elements:
<ONE>< ><TWO  ><  ><THREE><  >

2d) Return all non-whitespace elements with whitespace trimmed:
The return value contains these 3 elements:
<ONE><TWO><THREE>

2e) Split into only two elements:
The return value contains these 2 elements:
<><ONE[stop] [stop]TWO  [stop][stop]  [stop]THREE[stop][stop]  >

2f) Split into only two elements with whitespace trimmed:
The return value contains these 2 elements:
<><ONE[stop] [stop]TWO  [stop][stop]  [stop]THREE[stop][stop]>

2g) Split into only two non-empty elements:
The return value contains these 2 elements:
<ONE>< [stop]TWO  [stop][stop]  [stop]THREE[stop][stop]  >

2h) Split into only two non-whitespace elements with whitespace trimmed:
The return value contains these 2 elements:
<ONE><TWO  [stop][stop]  [stop]THREE[stop][stop]>

*/

// This example demonstrates the String.Split() methods that use
// the StringSplitOptions enumeration.

// Display the array of separated strings using a local function
let show  (entries: string[]) =
    printfn $"The return value contains these {entries.Length} elements:"
    for entry in entries do
        printf $"<{entry}>"
    printf "\n\n"

// Example 1: Split a string delimited by characters
printfn "1) Split a string delimited by characters:\n"

let s1 = ",ONE,, TWO,, , THREE,,"
let charSeparators = [| ',' |]

printfn $"The original string is: \"{s1}\"."
printfn $"The delimiter character is: '{charSeparators[0]}'.\n"

// Split the string and return all elements
printfn "1a) Return all elements:"
let result = s1.Split(charSeparators, StringSplitOptions.None)
show result

// Split the string and return all elements with whitespace trimmed
printfn "1b) Return all elements with whitespace trimmed:"
let result = s1.Split(charSeparators, StringSplitOptions.TrimEntries)
show result

// Split the string and return all non-empty elements
printfn "1c) Return all non-empty elements:"
let result = s1.Split(charSeparators, StringSplitOptions.RemoveEmptyEntries)
show result

// Split the string and return all non-whitespace elements with whitespace trimmed
printfn "1d) Return all non-whitespace elements with whitespace trimmed:"
let result = s1.Split(charSeparators, StringSplitOptions.RemoveEmptyEntries ||| StringSplitOptions.TrimEntries)
show result


// Split the string into only two elements, keeping the remainder in the last match
printfn "1e) Split into only two elements:"
let result = s1.Split(charSeparators, 2, StringSplitOptions.None)
show result

// Split the string into only two elements with whitespace trimmed, keeping the remainder in the last match
printfn "1f) Split into only two elements with whitespace trimmed:"
let result = s1.Split(charSeparators, 2, StringSplitOptions.TrimEntries)
show result

// Split the string into only two non-empty elements, keeping the remainder in the last match
printfn "1g) Split into only two non-empty elements:"
let result = s1.Split(charSeparators, 2, StringSplitOptions.RemoveEmptyEntries)
show result

// Split the string into only two non-whitespace elements with whitespace trimmed, keeping the remainder in the last match
printfn "1h) Split into only two non-whitespace elements with whitespace trimmed:"
let result = s1.Split(charSeparators, 2, StringSplitOptions.RemoveEmptyEntries ||| StringSplitOptions.TrimEntries)
show result


// Example 2: Split a string delimited by another string
printfn "2) Split a string delimited by another string:\n"

let s2 = "[stop]" +
            "ONE[stop] [stop]" +
            "TWO  [stop][stop]  [stop]" +
            "THREE[stop][stop]  "
let stringSeparators = [| "[stop]" |]

printfn $"The original string is: \"{s2}\"."
printfn $"The delimiter string is: \"{stringSeparators[0]}\".\n"

// Split the string and return all elements
printfn "2a) Return all elements:"
let result = s2.Split(stringSeparators, StringSplitOptions.None)
show result

// Split the string and return all elements with whitespace trimmed
printfn "2b) Return all elements with whitespace trimmed:"
let result = s2.Split(stringSeparators, StringSplitOptions.TrimEntries)
show result

// Split the string and return all non-empty elements
printfn "2c) Return all non-empty elements:"
let result = s2.Split(stringSeparators, StringSplitOptions.RemoveEmptyEntries)
show result

// Split the string and return all non-whitespace elements with whitespace trimmed
printfn "2d) Return all non-whitespace elements with whitespace trimmed:"
let result = s2.Split(stringSeparators, StringSplitOptions.RemoveEmptyEntries ||| StringSplitOptions.TrimEntries)
show result


// Split the string into only two elements, keeping the remainder in the last match
printfn "2e) Split into only two elements:"
let result = s2.Split(stringSeparators, 2, StringSplitOptions.None)
show result

// Split the string into only two elements with whitespace trimmed, keeping the remainder in the last match
printfn "2f) Split into only two elements with whitespace trimmed:"
let result = s2.Split(stringSeparators, 2, StringSplitOptions.TrimEntries)
show result

// Split the string into only two non-empty elements, keeping the remainder in the last match
printfn "2g) Split into only two non-empty elements:"
let result = s2.Split(stringSeparators, 2, StringSplitOptions.RemoveEmptyEntries)
show result

// Split the string into only two non-whitespace elements with whitespace trimmed, keeping the remainder in the last match
printfn "2h) Split into only two non-whitespace elements with whitespace trimmed:"
let result = s2.Split(stringSeparators, 2, StringSplitOptions.RemoveEmptyEntries ||| StringSplitOptions.TrimEntries)
show result

(*
This example produces the following results:

1) Split a string delimited by characters:

The original string is: ",ONE,, TWO,, , THREE,,".
The delimiter character is: ','.

1a) Return all elements:
The return value contains these 9 elements:
<><ONE><>< TWO><>< >< THREE><><>

1b) Return all elements with whitespace trimmed:
The return value contains these 9 elements:
<><ONE><><TWO><><><THREE><><>

1c) Return all non-empty elements:
The return value contains these 4 elements:
<ONE>< TWO>< >< THREE>

1d) Return all non-whitespace elements with whitespace trimmed:
The return value contains these 3 elements:
<ONE><TWO><THREE>

1e) Split into only two elements:
The return value contains these 2 elements:
<><ONE,, TWO,, , THREE,,>

1f) Split into only two elements with whitespace trimmed:
The return value contains these 2 elements:
<><ONE,, TWO,, , THREE,,>

1g) Split into only two non-empty elements:
The return value contains these 2 elements:
<ONE>< TWO,, , THREE,,>

1h) Split into only two non-whitespace elements with whitespace trimmed:
The return value contains these 2 elements:
<ONE><TWO,, , THREE,,>

2) Split a string delimited by another string:

The original string is: "[stop]ONE[stop] [stop]TWO  [stop][stop]  [stop]THREE[stop][stop]  ".
The delimiter string is: "[stop]".

2a) Return all elements:
The return value contains these 9 elements:
<><ONE>< ><TWO  ><><  ><THREE><><  >

2b) Return all elements with whitespace trimmed:
The return value contains these 9 elements:
<><ONE><><TWO><><><THREE><><>

2c) Return all non-empty elements:
The return value contains these 6 elements:
<ONE>< ><TWO  ><  ><THREE><  >

2d) Return all non-whitespace elements with whitespace trimmed:
The return value contains these 3 elements:
<ONE><TWO><THREE>

2e) Split into only two elements:
The return value contains these 2 elements:
<><ONE[stop] [stop]TWO  [stop][stop]  [stop]THREE[stop][stop]  >

2f) Split into only two elements with whitespace trimmed:
The return value contains these 2 elements:
<><ONE[stop] [stop]TWO  [stop][stop]  [stop]THREE[stop][stop]>

2g) Split into only two non-empty elements:
The return value contains these 2 elements:
<ONE>< [stop]TWO  [stop][stop]  [stop]THREE[stop][stop]  >

2h) Split into only two non-whitespace elements with whitespace trimmed:
The return value contains these 2 elements:
<ONE><TWO  [stop][stop]  [stop]THREE[stop][stop]>

*)

Public Shared Sub StringSplitOptionsExamples()
    ' This example demonstrates the String.Split() methods that use
    ' the StringSplitOptions enumeration.

    ' Example 1: Split a string delimited by characters
    Console.WriteLine("1) Split a string delimited by characters:" & vbCrLf)

    Dim s1 As String = ",ONE,, TWO,, , THREE,,"
    Dim charSeparators() As Char = {","c}
    Dim result() As String

    Console.WriteLine("The original string is: ""{0}"".", s1)
    Console.WriteLine("The delimiter character is: '{0}'." & vbCrLf, charSeparators(0))

    ' Split the string and return all elements
    Console.WriteLine("1a) Return all elements:")
    result = s1.Split(charSeparators, StringSplitOptions.None)
    Show(result)

    ' Split the string and return all elements with whitespace trimmed
    Console.WriteLine("1b) Return all elements with whitespace trimmed:")
    result = s1.Split(charSeparators, StringSplitOptions.TrimEntries)
    Show(result)

    ' Split the string and return all non-empty elements
    Console.WriteLine("1c) Return all non-empty elements:")
    result = s1.Split(charSeparators, StringSplitOptions.RemoveEmptyEntries)
    Show(result)

    ' Split the string and return all non-whitespace elements with whitespace trimmed
    Console.WriteLine("1d) Return all non-whitespace elements with whitespace trimmed:")
    result = s1.Split(charSeparators, StringSplitOptions.RemoveEmptyEntries Or StringSplitOptions.TrimEntries)
    Show(result)


    ' Split the string into only two elements, keeping the remainder in the last match
    Console.WriteLine("1e) Split into only two elements:")
    result = s1.Split(charSeparators, 2, StringSplitOptions.None)
    Show(result)

    ' Split the string into only two elements with whitespace trimmed, keeping the remainder in the last match
    Console.WriteLine("1f) Split into only two elements with whitespace trimmed:")
    result = s1.Split(charSeparators, 2, StringSplitOptions.TrimEntries)
    Show(result)

    ' Split the string into only two non-empty elements, keeping the remainder in the last match
    Console.WriteLine("1g) Split into only two non-empty elements:")
    result = s1.Split(charSeparators, 2, StringSplitOptions.RemoveEmptyEntries)
    Show(result)

    ' Split the string into only two non-whitespace elements with whitespace trimmed, keeping the remainder in the last match
    Console.WriteLine("1h) Split into only two non-whitespace elements with whitespace trimmed:")
    result = s1.Split(charSeparators, 2, StringSplitOptions.RemoveEmptyEntries Or StringSplitOptions.TrimEntries)
    Show(result)


    ' Example 2: Split a string delimited by another string
    Console.WriteLine("2) Split a string delimited by another string:" & vbCrLf)

    Dim s2 As String = "[stop]" +
                "ONE[stop] [stop]" +
                "TWO  [stop][stop]  [stop]" +
                "THREE[stop][stop]  "
    Dim stringSeparators() As String = {"[stop]"}


    Console.WriteLine("The original string is: ""{0}"".", s2)
    Console.WriteLine("The delimiter string is: ""{0}""." & vbCrLf, stringSeparators(0))

    ' Split the string and return all elements
    Console.WriteLine("2a) Return all elements:")
    result = s2.Split(stringSeparators, StringSplitOptions.None)
    Show(result)

    ' Split the string and return all elements with whitespace trimmed
    Console.WriteLine("2b) Return all elements with whitespace trimmed:")
    result = s2.Split(stringSeparators, StringSplitOptions.TrimEntries)
    Show(result)

    ' Split the string and return all non-empty elements
    Console.WriteLine("2c) Return all non-empty elements:")
    result = s2.Split(stringSeparators, StringSplitOptions.RemoveEmptyEntries)
    Show(result)

    ' Split the string and return all non-whitespace elements with whitespace trimmed
    Console.WriteLine("2d) Return all non-whitespace elements with whitespace trimmed:")
    result = s2.Split(stringSeparators, StringSplitOptions.RemoveEmptyEntries Or StringSplitOptions.TrimEntries)
    Show(result)


    ' Split the string into only two elements, keeping the remainder in the last match
    Console.WriteLine("2e) Split into only two elements:")
    result = s2.Split(stringSeparators, 2, StringSplitOptions.None)
    Show(result)

    ' Split the string into only two elements with whitespace trimmed, keeping the remainder in the last match
    Console.WriteLine("2f) Split into only two elements with whitespace trimmed:")
    result = s2.Split(stringSeparators, 2, StringSplitOptions.TrimEntries)
    Show(result)

    ' Split the string into only two non-empty elements, keeping the remainder in the last match
    Console.WriteLine("2g) Split into only two non-empty elements:")
    result = s2.Split(stringSeparators, 2, StringSplitOptions.RemoveEmptyEntries)
    Show(result)

    ' Split the string into only two non-whitespace elements with whitespace trimmed, keeping the remainder in the last match
    Console.WriteLine("2h) Split into only two non-whitespace elements with whitespace trimmed:")
    result = s2.Split(stringSeparators, 2, StringSplitOptions.RemoveEmptyEntries Or StringSplitOptions.TrimEntries)
    Show(result)

End Sub

' Display the array of separated strings.
Public Shared Sub Show(ByVal entries() As String)
    Console.WriteLine("The return value contains these {0} elements:", entries.Length)
    Dim entry As String
    For Each entry In entries
        Console.Write("<{0}>", entry)
    Next entry
    Console.Write(vbCrLf & vbCrLf)

End Sub

'This example produces the following results:
'
' 1) Split a string delimited by characters:
'
' The original string is: ",ONE,, TWO,, , THREE,,".
' The delimiter character is: ','.
'
' 1a) Return all elements:
' The return value contains these 9 elements:
' <><ONE><>< TWO><>< >< THREE><><>
'
' 1b) Return all elements with whitespace trimmed:
' The return value contains these 9 elements:
' <><ONE><><TWO><><><THREE><><>
'
' 1c) Return all non-empty elements:
' The return value contains these 4 elements:
' <ONE>< TWO>< >< THREE>
'
' 1d) Return all non-whitespace elements with whitespace trimmed:
' The return value contains these 3 elements:
' <ONE><TWO><THREE>
'
' 1e) Split into only two elements:
' The return value contains these 2 elements:
' <><ONE,, TWO,, , THREE,,>
'
' 1f) Split into only two elements with whitespace trimmed:
' The return value contains these 2 elements:
' <><ONE,, TWO,, , THREE,,>
'
' 1g) Split into only two non-empty elements:
' The return value contains these 2 elements:
' <ONE>< TWO,, , THREE,,>
'
' 1h) Split into only two non-whitespace elements with whitespace trimmed:
' The return value contains these 2 elements:
' <ONE><TWO,, , THREE,,>
'
' 2) Split a string delimited by another string:
'
' The original string is: "[stop]ONE[stop] [stop]TWO  [stop][stop]  [stop]THREE[stop][stop]  ".
' The delimiter string is: "[stop]".
'
' 2a) Return all elements:
' The return value contains these 9 elements:
' <><ONE>< ><TWO  ><><  ><THREE><><  >
'
' 2b) Return all elements with whitespace trimmed:
' The return value contains these 9 elements:
' <><ONE><><TWO><><><THREE><><>
'
' 2c) Return all non-empty elements:
' The return value contains these 6 elements:
' <ONE>< ><TWO  ><  ><THREE><  >
'
' 2d) Return all non-whitespace elements with whitespace trimmed:
' The return value contains these 3 elements:
' <ONE><TWO><THREE>
'
' 2e) Split into only two elements:
' The return value contains these 2 elements:
' <><ONE[stop] [stop]TWO  [stop][stop]  [stop]THREE[stop][stop]  >
'
' 2f) Split into only two elements with whitespace trimmed:
' The return value contains these 2 elements:
' <><ONE[stop] [stop]TWO  [stop][stop]  [stop]THREE[stop][stop]>
'
' 2g) Split into only two non-empty elements:
' The return value contains these 2 elements:
' <ONE>< [stop]TWO  [stop][stop]  [stop]THREE[stop][stop]  >
'
' 2h) Split into only two non-whitespace elements with whitespace trimmed:
' The return value contains these 2 elements:
' <ONE><TWO  [stop][stop]  [stop]THREE[stop][stop]>
'

備註

傳回數位元素中不包含分隔符。

若此實例不包含中的 separator任何字元，或 count 參數為 1，則回傳的陣列僅包含一個包含此實例的元素。

若 separator 參數為 null 或不包含任何字元，則假設空白字元為分隔符。空白字元由 Unicode 標準定義， Char.IsWhiteSpace 若被傳遞，方法會回傳 true 。

要通過 null 參數 char[] separator ，必須指定的 null 類型，以區分呼叫與其他過載，例如 Split(String[], Int32, StringSplitOptions)。下列範例示範數種方式來明確識別此多載。

string phrase = "The quick  brown fox";

_ = phrase.Split(default(char[]), 3, StringSplitOptions.RemoveEmptyEntries);

_ = phrase.Split((char[]?)null, 3, StringSplitOptions.RemoveEmptyEntries);

_ = phrase.Split(null as char[], 3, StringSplitOptions.RemoveEmptyEntries);

let phrase = "The quick  brown fox"

phrase.Split(Unchecked.defaultof<char[]>, 3, StringSplitOptions.RemoveEmptyEntries) |> ignore

phrase.Split(null :> char[], 3, StringSplitOptions.RemoveEmptyEntries) |> ignore

phrase.Split((null: char[]), 3, StringSplitOptions.RemoveEmptyEntries) |> ignore

Dim phrase As String = "The quick brown fox"
Dim words() As String

words = phrase.Split(TryCast(Nothing, Char()), 3,
                       StringSplitOptions.RemoveEmptyEntries)

words = phrase.Split(New Char() {}, 3,
                     StringSplitOptions.RemoveEmptyEntries)

若 count 參數為零，或 options 參數為 RemoveEmptyEntries 且實例長度為零，則回傳一個空陣列。

每個 separator 元素定義一個獨立的分隔字元。若 options 參數為 None，且兩個分隔符相鄰，或在本實例的開始或結尾找到分隔符，則對應的陣列元素包含 Empty。

若此實例中子串超過 count 數，首 count 個負 1 子串會回傳回傳值的前 count -1 元素，剩餘字元則回傳回返回值的最後一個元素。

若 count 大於子字串數量，則回傳可用子字串，且不拋出例外。

效能考慮

給呼叫者的注意事項

適用於

Split(Char, Int32, StringSplitOptions)

來源:: String.Manipulation.cs

來源:: String.Manipulation.cs

來源:: String.Manipulation.cs

來源:: String.Manipulation.cs

根據提供的字元分隔符，將字串分割成最大子字串數目，選擇性地省略結果中的空白子字串。

public string[] Split(char separator, int count, StringSplitOptions options = System.StringSplitOptions.None);

member this.Split : char * int * StringSplitOptions -> string[]

Public Function Split (separator As Char, count As Integer, Optional options As StringSplitOptions = System.StringSplitOptions.None) As String()

參數

separator: Char

分隔這個實例中子字串的字元。

count: Int32

陣列中預期的元素數目上限。

options: StringSplitOptions

列舉值的位元組合，指定是否要修剪子字串並包含空子字串。

傳回

String[]

一個陣列，最多包含 count 此實例中由分隔 separator的子串。

備註

如果字串已經被拆分 count - 1 次，但尚未到達字串的末尾，則回傳陣列的最後一個字串將包含該實例剩餘的尾隨子串，且未被動過。

適用於

Split(String[], StringSplitOptions)

來源:: String.Manipulation.cs

來源:: String.Manipulation.cs

來源:: String.Manipulation.cs

來源:: String.Manipulation.cs

根據指定的分隔字串，將字串分割成子字串串，並選擇性地將字串分割成子字串。

public:
 cli::array <System::String ^> ^ Split(cli::array <System::String ^> ^ separator, StringSplitOptions options);

public string[] Split(string[] separator, StringSplitOptions options);

public string[] Split(string[]? separator, StringSplitOptions options);

[System.Runtime.InteropServices.ComVisible(false)]
public string[] Split(string[] separator, StringSplitOptions options);

member this.Split : string[] * StringSplitOptions -> string[]

[<System.Runtime.InteropServices.ComVisible(false)>]
member this.Split : string[] * StringSplitOptions -> string[]

Public Function Split (separator As String(), options As StringSplitOptions) As String()

參數

separator: String[]

一個由字串組成的陣列，用來分隔該字串中的子字串;一個包含分隔符的空陣列;或 null是。

options: StringSplitOptions

列舉值的位元組合，指定是否要修剪子字串並包含空子字串。

傳回

String[]

一個陣列，其元素包含該字串中由一個或多個字串 separator分隔的子字串。如需詳細資訊，請參閱一節。

屬性: ComVisibleAttribute

例外狀況

ArgumentException

options 不是其中 StringSplitOptions 的價值觀之一。

範例

以下範例說明了呼叫參數optionsStringSplitOptions.None為和 StringSplitOptions.RemoveEmptyEntries的字串String.Split(String[], StringSplitOptions)方法時，回傳陣列的差異。

string source = "[stop]ONE[stop][stop]TWO[stop][stop][stop]THREE[stop][stop]";
string[] stringSeparators = new string[] { "[stop]" };
string[] result;

// Display the original string and delimiter string.
Console.WriteLine($"Splitting the string:\n   \"{source}\".");
Console.WriteLine();
Console.WriteLine($"Using the delimiter string:\n   \"{stringSeparators[0]}\"");
Console.WriteLine();

// Split a string delimited by another string and return all elements.
result = source.Split(stringSeparators, StringSplitOptions.None);
Console.WriteLine($"Result including all elements ({result.Length} elements):");
Console.Write("   ");
foreach (string s in result)
{
    Console.Write("'{0}' ", String.IsNullOrEmpty(s) ? "<>" : s);
}
Console.WriteLine();
Console.WriteLine();

// Split delimited by another string and return all non-empty elements.
result = source.Split(stringSeparators, StringSplitOptions.RemoveEmptyEntries);
Console.WriteLine($"Result including non-empty elements ({result.Length} elements):");
Console.Write("   ");
foreach (string s in result)
{
    Console.Write("'{0}' ", String.IsNullOrEmpty(s) ? "<>" : s);
}
Console.WriteLine();

// The example displays the following output:
//    Splitting the string:
//       "[stop]ONE[stop][stop]TWO[stop][stop][stop]THREE[stop][stop]".
//
//    Using the delimiter string:
//       "[stop]"
//
//    Result including all elements (9 elements):
//       '<>' 'ONE' '<>' 'TWO' '<>' '<>' 'THREE' '<>' '<>'
//
//    Result including non-empty elements (3 elements):
//       'ONE' 'TWO' 'THREE'

let source = "[stop]ONE[stop][stop]TWO[stop][stop][stop]THREE[stop][stop]"
let stringSeparators = [| "[stop]" |]

// Display the original string and delimiter string.
printfn $"Splitting the string:\n   \"{source}\".\n"
printfn $"Using the delimiter string:\n   \"{stringSeparators[0]}\"\n"

// Split a string delimited by another string and return all elements.
let result = source.Split(stringSeparators, StringSplitOptions.None)
printfn $"Result including all elements ({result.Length} elements):"
printf "   "
for s in result do
    printf $"""'{if String.IsNullOrEmpty s then "<>" else s}' """
printfn "\n"

// Split delimited by another string and return all non-empty elements.
let result = source.Split(stringSeparators, StringSplitOptions.RemoveEmptyEntries)
Console.WriteLine($"Result including non-empty elements ({result.Length} elements):")
printf "   "
for s in result do
    printf $"""'{if String.IsNullOrEmpty s then "<>" else s}' """
printfn ""

// The example displays the following output:
//    Splitting the string:
//       "[stop]ONE[stop][stop]TWO[stop][stop][stop]THREE[stop][stop]".
//
//    Using the delimiter string:
//       "[stop]"
//
//    let result including all elements (9 elements):
//       '<>' 'ONE' '<>' 'TWO' '<>' '<>' 'THREE' '<>' '<>'
//
//    let result including non-empty elements (3 elements):
//       'ONE' 'TWO' 'THREE'

Dim source As String = "[stop]ONE[stop][stop]TWO[stop][stop][stop]THREE[stop][stop]"
Dim stringSeparators() As String = {"[stop]"}
Dim result() As String

' Display the original string and delimiter string.
Console.WriteLine("Splitting the string:{0}   '{1}'.", vbCrLf, source)
Console.WriteLine()
Console.WriteLine("Using the delimiter string:{0}   '{1}'.",
                vbCrLf, stringSeparators(0))
Console.WriteLine()

' Split a string delimited by another string and return all elements.
result = source.Split(stringSeparators, StringSplitOptions.None)
Console.WriteLine("Result including all elements ({0} elements):",
                result.Length)
Console.Write("   ")
For Each s As String In result
    Console.Write("'{0}' ", IIf(String.IsNullOrEmpty(s), "<>", s))
Next
Console.WriteLine()
Console.WriteLine()

' Split delimited by another string and return all non-empty elements.
result = source.Split(stringSeparators,
                    StringSplitOptions.RemoveEmptyEntries)
Console.WriteLine("Result including non-empty elements ({0} elements):",
                result.Length)
Console.Write("   ")
For Each s As String In result
    Console.Write("'{0}' ", IIf(String.IsNullOrEmpty(s), "<>", s))
Next
Console.WriteLine()

' The example displays the following output:
'    Splitting the string:
'       "[stop]ONE[stop][stop]TWO[stop][stop][stop]THREE[stop][stop]".
'    
'    Using the delimiter string:
'       "[stop]"
'    
'    Result including all elements (9 elements):
'       '<>' 'ONE' '<>' 'TWO' '<>' '<>' 'THREE' '<>' '<>'
'    
'    Result including non-empty elements (3 elements):
'       'ONE' 'TWO' 'THREE'

下列範例會定義分隔符陣列，其中包含標點符號和空格符。將此陣列連同的 StringSplitOptions.RemoveEmptyEntries 值傳給方法， Split(String[], StringSplitOptions) 會回傳一個由字串中個別字組成的陣列。

string[] separators = { ",", ".", "!", "?", ";", ":", " " };
string value = "The handsome, energetic, young dog was playing with his smaller, more lethargic litter mate.";
string[] words = value.Split(separators, StringSplitOptions.RemoveEmptyEntries);
foreach (var word in words)
    Console.WriteLine(word);

// The example displays the following output:
//       The
//       handsome
//       energetic
//       young
//       dog
//       was
//       playing
//       with
//       his
//       smaller
//       more
//       lethargic
//       litter
//       mate

let separators = [| ","; "."; "!"; "?"; ""; ":"; " " |]
let value = "The handsome, energetic, young dog was playing with his smaller, more lethargic litter mate."
let words = value.Split(separators, StringSplitOptions.RemoveEmptyEntries)
for word in words do
    printfn $"${word}"

// The example displays the following output:
//       The
//       handsome
//       energetic
//       young
//       dog
//       was
//       playing
//       with
//       his
//       smaller
//       more
//       lethargic
//       litter
//       mate

    Dim separators() As String = {",", ".", "!", "?", ";", ":", " "}
    Dim value As String = "The handsome, energetic, young dog was playing with his smaller, more lethargic litter mate."
    Dim words() As String = value.Split(separators, StringSplitOptions.RemoveEmptyEntries)
    For Each word In words
        Console.WriteLine(word)
    Next
End Sub

' The example displays the following output:
'
'       The
'       handsome
'       energetic
'       young
'       dog
'       was
'       playing
'       with
'       his
'       smaller
'       more
'       lethargic
'       litter
'       mate

請注意，該方法的 options 參數設定為 StringSplitOptions.RemoveEmptyEntries。這會防止回傳的陣列包含 String.Empty 代表標點符號與空白字元間空子串匹配的值。

備註

當字串被已知字串分隔時，你可以用這個 Split 方法將其分成子字串。

傳回數位的元素中不包含分隔符字串。例如，若 separator 陣列包含字串「--」，且當前字串實例值為「aa--bb--cc」，則該方法回傳包含三個元素的陣列：「aa」、「bb」和「cc」。

如果這個實例不包含中 separator的任何字串，回傳的陣列就只包含一個包含該實例的元素。

若 options 參數為且 RemoveEmptyEntries 該實例長度為零，則方法回傳一個空陣列。

每個 separator 元素定義一個由一個或多個字元組成的獨立分隔符。若 options 參數為 None，且有兩個分隔符相鄰，或在本實例的開始或結尾找到分隔符，則對應的陣列元素包含 String.Empty。例如，若 separator 包含兩個元素「-」和「_」，字串實例值為「-_aa-_」，參數 options 值為 None，該方法回傳包含以下五個元素的字串陣列：

String.Empty，代表索引為0的「-」子字串之前的空字串。
String.Empty，代表索引為0的「-」子串與索引1的「_」子串之間的空字串。
“aa”。
String.Empty，代表位於索引4的「-」子串後的空字串。
String.Empty，代表位於索引 5 的「_」子串後的空字串。

分隔符陣列

若中 separator 任一元素包含多個字元，整個子串即視為分隔符。例如，若中的 separator 某個元素是「10」，嘗試拆分字串「This10is10a10string.」會回傳以下四元素陣列：{ 「This」、「is」、「a」、「string.」}。

若 separator 參數為 null 或包含非空字串，則假設空白字元為分隔符。空白字元由 Unicode 標準定義， Char.IsWhiteSpace 若被傳遞，方法會回傳 true 。

要通過 null 參數 string[] separator ，必須指定的 null 類型，以區分呼叫與其他過載，例如 Split(Char[], StringSplitOptions)。下列範例示範數種方式來明確識別此多載。

string phrase = "The quick  brown fox";

_ = phrase.Split(default(string[]), StringSplitOptions.RemoveEmptyEntries);

_ = phrase.Split((string[]?)null, StringSplitOptions.RemoveEmptyEntries);

_ = phrase.Split(null as string[], StringSplitOptions.RemoveEmptyEntries);

let phrase = "The quick  brown fox"

phrase.Split(Unchecked.defaultof<string[]>, StringSplitOptions.RemoveEmptyEntries) |> ignore

phrase.Split(null :> string[], StringSplitOptions.RemoveEmptyEntries) |> ignore

phrase.Split((null: string[]), StringSplitOptions.RemoveEmptyEntries) |> ignore

Dim phrase As String = "The quick brown fox"
Dim words() As String

words = phrase.Split(TryCast(Nothing, String()),
                       StringSplitOptions.RemoveEmptyEntries)

words = phrase.Split(New String() {},
                     StringSplitOptions.RemoveEmptyEntries)

比較詳細數據

該方法會 Split 擷取由參數中 separator 一個或多個字串分隔的子字串，並將這些子字串作為陣列的元素回傳。

此Split方法忽略值為 null 的separator元素或空字串（“”）。

為避免當字 separator 串有共同字元時產生歧義，操作 Split 從實例值的開始到結束，並匹配第一個元素，該元素 separator 等於實例中的分隔符。子串在實例中遇到的順序優先於元素的順序 separator。

例如，請考慮值為「abcdef」的實例。若中 separator 第一個元素為「ef」，第二個元素為「bcde」，則拆分操作的結果將是一個包含兩個元素「a」與「f」的字串陣列。這是因為實例中的子字串「bcde」在子字串「f」出現之前，已經與中的 separator 元素相匹配。

然而，若的 separator 第一個元素為「bcd」，第二個元素為「bc」，則拆分操作的結果將是一個包含兩個元素「a」與「ef」的字串陣列。這是因為「bcd」是第一個與該實例中分隔符相符的分隔符 separator 。如果分隔符的順序反轉，因此第一個元素是 “bc”，而第二個元素是 “bcd”，則結果會是包含兩個元素 “a” 和 “def” 的字符串陣列。

效能考慮

給呼叫者的注意事項

適用於

Split(String, Int32, StringSplitOptions)

來源:: String.Manipulation.cs

來源:: String.Manipulation.cs

來源:: String.Manipulation.cs

來源:: String.Manipulation.cs

根據指定的分隔字串，將字串分割成最大子字串數目，並選擇性地將字串分割成最大數目。

public string[] Split(string? separator, int count, StringSplitOptions options = System.StringSplitOptions.None);

public string[] Split(string separator, int count, StringSplitOptions options = System.StringSplitOptions.None);

member this.Split : string * int * StringSplitOptions -> string[]

Public Function Split (separator As String, count As Integer, Optional options As StringSplitOptions = System.StringSplitOptions.None) As String()

參數

separator: String

分隔這個實例中子字串的字串。

count: Int32

陣列中預期的元素數目上限。

options: StringSplitOptions

列舉值的位元組合，指定是否要修剪子字串並包含空子字串。

傳回

String[]

一個陣列，最多包含 count 此實例中由分隔 separator的子串。

備註

如果字串已經被拆分 count - 1 次，但尚未到達字串的末尾，則回傳陣列的最後一個字串將包含該實例剩餘的尾隨子串，且未被動過。

適用於

Split(Char[], StringSplitOptions)

來源:: String.Manipulation.cs

來源:: String.Manipulation.cs

來源:: String.Manipulation.cs

來源:: String.Manipulation.cs

根據指定的分隔字元和選項，將字串分割成子字串。

public:
 cli::array <System::String ^> ^ Split(cli::array <char> ^ separator, StringSplitOptions options);

public string[] Split(char[] separator, StringSplitOptions options);

public string[] Split(char[]? separator, StringSplitOptions options);

[System.Runtime.InteropServices.ComVisible(false)]
public string[] Split(char[] separator, StringSplitOptions options);

member this.Split : char[] * StringSplitOptions -> string[]

[<System.Runtime.InteropServices.ComVisible(false)>]
member this.Split : char[] * StringSplitOptions -> string[]

Public Function Split (separator As Char(), options As StringSplitOptions) As String()

參數

separator: Char[]

一個用來分隔該字串子串的字元陣列、一個不含分隔符的空陣列，或 null是。

options: StringSplitOptions

列舉值的位元組合，指定是否要修剪子字串並包含空子字串。

傳回

String[]

一個陣列，其元素包含該字串中由一個或多個字 separator元界定的子串。如需詳細資訊，請參閱一節。

屬性: ComVisibleAttribute

例外狀況

ArgumentException

options 不是其中 StringSplitOptions 的價值觀之一。

範例

以下範例利用 StringSplitOptions 列舉來包含或排除由 Split 該方法產生的子字串。

// This example demonstrates the String.Split() methods that use
// the StringSplitOptions enumeration.

// Example 1: Split a string delimited by characters
Console.WriteLine("1) Split a string delimited by characters:\n");

string s1 = ",ONE,, TWO,, , THREE,,";
char[] charSeparators = new char[] { ',' };
string[] result;

Console.WriteLine($"The original string is: \"{s1}\".");
Console.WriteLine($"The delimiter character is: '{charSeparators[0]}'.\n");

// Split the string and return all elements
Console.WriteLine("1a) Return all elements:");
result = s1.Split(charSeparators, StringSplitOptions.None);
Show(result);

// Split the string and return all elements with whitespace trimmed
Console.WriteLine("1b) Return all elements with whitespace trimmed:");
result = s1.Split(charSeparators, StringSplitOptions.TrimEntries);
Show(result);

// Split the string and return all non-empty elements
Console.WriteLine("1c) Return all non-empty elements:");
result = s1.Split(charSeparators, StringSplitOptions.RemoveEmptyEntries);
Show(result);

// Split the string and return all non-whitespace elements with whitespace trimmed
Console.WriteLine("1d) Return all non-whitespace elements with whitespace trimmed:");
result = s1.Split(charSeparators, StringSplitOptions.RemoveEmptyEntries | StringSplitOptions.TrimEntries);
Show(result);


// Split the string into only two elements, keeping the remainder in the last match
Console.WriteLine("1e) Split into only two elements:");
result = s1.Split(charSeparators, 2, StringSplitOptions.None);
Show(result);

// Split the string into only two elements with whitespace trimmed, keeping the remainder in the last match
Console.WriteLine("1f) Split into only two elements with whitespace trimmed:");
result = s1.Split(charSeparators, 2, StringSplitOptions.TrimEntries);
Show(result);

// Split the string into only two non-empty elements, keeping the remainder in the last match
Console.WriteLine("1g) Split into only two non-empty elements:");
result = s1.Split(charSeparators, 2, StringSplitOptions.RemoveEmptyEntries);
Show(result);

// Split the string into only two non-whitespace elements with whitespace trimmed, keeping the remainder in the last match
Console.WriteLine("1h) Split into only two non-whitespace elements with whitespace trimmed:");
result = s1.Split(charSeparators, 2, StringSplitOptions.RemoveEmptyEntries | StringSplitOptions.TrimEntries);
Show(result);


// Example 2: Split a string delimited by another string
Console.WriteLine("2) Split a string delimited by another string:\n");

string s2 = "[stop]" +
            "ONE[stop] [stop]" +
            "TWO  [stop][stop]  [stop]" +
            "THREE[stop][stop]  ";
string[] stringSeparators = new string[] { "[stop]" };

Console.WriteLine($"The original string is: \"{s2}\".");
Console.WriteLine($"The delimiter string is: \"{stringSeparators[0]}\".\n");

// Split the string and return all elements
Console.WriteLine("2a) Return all elements:");
result = s2.Split(stringSeparators, StringSplitOptions.None);
Show(result);

// Split the string and return all elements with whitespace trimmed
Console.WriteLine("2b) Return all elements with whitespace trimmed:");
result = s2.Split(stringSeparators, StringSplitOptions.TrimEntries);
Show(result);

// Split the string and return all non-empty elements
Console.WriteLine("2c) Return all non-empty elements:");
result = s2.Split(stringSeparators, StringSplitOptions.RemoveEmptyEntries);
Show(result);

// Split the string and return all non-whitespace elements with whitespace trimmed
Console.WriteLine("2d) Return all non-whitespace elements with whitespace trimmed:");
result = s2.Split(stringSeparators, StringSplitOptions.RemoveEmptyEntries | StringSplitOptions.TrimEntries);
Show(result);


// Split the string into only two elements, keeping the remainder in the last match
Console.WriteLine("2e) Split into only two elements:");
result = s2.Split(stringSeparators, 2, StringSplitOptions.None);
Show(result);

// Split the string into only two elements with whitespace trimmed, keeping the remainder in the last match
Console.WriteLine("2f) Split into only two elements with whitespace trimmed:");
result = s2.Split(stringSeparators, 2, StringSplitOptions.TrimEntries);
Show(result);

// Split the string into only two non-empty elements, keeping the remainder in the last match
Console.WriteLine("2g) Split into only two non-empty elements:");
result = s2.Split(stringSeparators, 2, StringSplitOptions.RemoveEmptyEntries);
Show(result);

// Split the string into only two non-whitespace elements with whitespace trimmed, keeping the remainder in the last match
Console.WriteLine("2h) Split into only two non-whitespace elements with whitespace trimmed:");
result = s2.Split(stringSeparators, 2, StringSplitOptions.RemoveEmptyEntries | StringSplitOptions.TrimEntries);
Show(result);


// Display the array of separated strings using a local function
void Show(string[] entries)
{
    Console.WriteLine($"The return value contains these {entries.Length} elements:");
    foreach (string entry in entries)
    {
        Console.Write($"<{entry}>");
    }
    Console.Write("\n\n");
}

/*
This example produces the following results:

1) Split a string delimited by characters:

The original string is: ",ONE,, TWO,, , THREE,,".
The delimiter character is: ','.

1a) Return all elements:
The return value contains these 9 elements:
<><ONE><>< TWO><>< >< THREE><><>

1b) Return all elements with whitespace trimmed:
The return value contains these 9 elements:
<><ONE><><TWO><><><THREE><><>

1c) Return all non-empty elements:
The return value contains these 4 elements:
<ONE>< TWO>< >< THREE>

1d) Return all non-whitespace elements with whitespace trimmed:
The return value contains these 3 elements:
<ONE><TWO><THREE>

1e) Split into only two elements:
The return value contains these 2 elements:
<><ONE,, TWO,, , THREE,,>

1f) Split into only two elements with whitespace trimmed:
The return value contains these 2 elements:
<><ONE,, TWO,, , THREE,,>

1g) Split into only two non-empty elements:
The return value contains these 2 elements:
<ONE>< TWO,, , THREE,,>

1h) Split into only two non-whitespace elements with whitespace trimmed:
The return value contains these 2 elements:
<ONE><TWO,, , THREE,,>

2) Split a string delimited by another string:

The original string is: "[stop]ONE[stop] [stop]TWO  [stop][stop]  [stop]THREE[stop][stop]  ".
The delimiter string is: "[stop]".

2a) Return all elements:
The return value contains these 9 elements:
<><ONE>< ><TWO  ><><  ><THREE><><  >

2b) Return all elements with whitespace trimmed:
The return value contains these 9 elements:
<><ONE><><TWO><><><THREE><><>

2c) Return all non-empty elements:
The return value contains these 6 elements:
<ONE>< ><TWO  ><  ><THREE><  >

2d) Return all non-whitespace elements with whitespace trimmed:
The return value contains these 3 elements:
<ONE><TWO><THREE>

2e) Split into only two elements:
The return value contains these 2 elements:
<><ONE[stop] [stop]TWO  [stop][stop]  [stop]THREE[stop][stop]  >

2f) Split into only two elements with whitespace trimmed:
The return value contains these 2 elements:
<><ONE[stop] [stop]TWO  [stop][stop]  [stop]THREE[stop][stop]>

2g) Split into only two non-empty elements:
The return value contains these 2 elements:
<ONE>< [stop]TWO  [stop][stop]  [stop]THREE[stop][stop]  >

2h) Split into only two non-whitespace elements with whitespace trimmed:
The return value contains these 2 elements:
<ONE><TWO  [stop][stop]  [stop]THREE[stop][stop]>

*/

// This example demonstrates the String.Split() methods that use
// the StringSplitOptions enumeration.

// Display the array of separated strings using a local function
let show  (entries: string[]) =
    printfn $"The return value contains these {entries.Length} elements:"
    for entry in entries do
        printf $"<{entry}>"
    printf "\n\n"

// Example 1: Split a string delimited by characters
printfn "1) Split a string delimited by characters:\n"

let s1 = ",ONE,, TWO,, , THREE,,"
let charSeparators = [| ',' |]

printfn $"The original string is: \"{s1}\"."
printfn $"The delimiter character is: '{charSeparators[0]}'.\n"

// Split the string and return all elements
printfn "1a) Return all elements:"
let result = s1.Split(charSeparators, StringSplitOptions.None)
show result

// Split the string and return all elements with whitespace trimmed
printfn "1b) Return all elements with whitespace trimmed:"
let result = s1.Split(charSeparators, StringSplitOptions.TrimEntries)
show result

// Split the string and return all non-empty elements
printfn "1c) Return all non-empty elements:"
let result = s1.Split(charSeparators, StringSplitOptions.RemoveEmptyEntries)
show result

// Split the string and return all non-whitespace elements with whitespace trimmed
printfn "1d) Return all non-whitespace elements with whitespace trimmed:"
let result = s1.Split(charSeparators, StringSplitOptions.RemoveEmptyEntries ||| StringSplitOptions.TrimEntries)
show result


// Split the string into only two elements, keeping the remainder in the last match
printfn "1e) Split into only two elements:"
let result = s1.Split(charSeparators, 2, StringSplitOptions.None)
show result

// Split the string into only two elements with whitespace trimmed, keeping the remainder in the last match
printfn "1f) Split into only two elements with whitespace trimmed:"
let result = s1.Split(charSeparators, 2, StringSplitOptions.TrimEntries)
show result

// Split the string into only two non-empty elements, keeping the remainder in the last match
printfn "1g) Split into only two non-empty elements:"
let result = s1.Split(charSeparators, 2, StringSplitOptions.RemoveEmptyEntries)
show result

// Split the string into only two non-whitespace elements with whitespace trimmed, keeping the remainder in the last match
printfn "1h) Split into only two non-whitespace elements with whitespace trimmed:"
let result = s1.Split(charSeparators, 2, StringSplitOptions.RemoveEmptyEntries ||| StringSplitOptions.TrimEntries)
show result


// Example 2: Split a string delimited by another string
printfn "2) Split a string delimited by another string:\n"

let s2 = "[stop]" +
            "ONE[stop] [stop]" +
            "TWO  [stop][stop]  [stop]" +
            "THREE[stop][stop]  "
let stringSeparators = [| "[stop]" |]

printfn $"The original string is: \"{s2}\"."
printfn $"The delimiter string is: \"{stringSeparators[0]}\".\n"

// Split the string and return all elements
printfn "2a) Return all elements:"
let result = s2.Split(stringSeparators, StringSplitOptions.None)
show result

// Split the string and return all elements with whitespace trimmed
printfn "2b) Return all elements with whitespace trimmed:"
let result = s2.Split(stringSeparators, StringSplitOptions.TrimEntries)
show result

// Split the string and return all non-empty elements
printfn "2c) Return all non-empty elements:"
let result = s2.Split(stringSeparators, StringSplitOptions.RemoveEmptyEntries)
show result

// Split the string and return all non-whitespace elements with whitespace trimmed
printfn "2d) Return all non-whitespace elements with whitespace trimmed:"
let result = s2.Split(stringSeparators, StringSplitOptions.RemoveEmptyEntries ||| StringSplitOptions.TrimEntries)
show result


// Split the string into only two elements, keeping the remainder in the last match
printfn "2e) Split into only two elements:"
let result = s2.Split(stringSeparators, 2, StringSplitOptions.None)
show result

// Split the string into only two elements with whitespace trimmed, keeping the remainder in the last match
printfn "2f) Split into only two elements with whitespace trimmed:"
let result = s2.Split(stringSeparators, 2, StringSplitOptions.TrimEntries)
show result

// Split the string into only two non-empty elements, keeping the remainder in the last match
printfn "2g) Split into only two non-empty elements:"
let result = s2.Split(stringSeparators, 2, StringSplitOptions.RemoveEmptyEntries)
show result

// Split the string into only two non-whitespace elements with whitespace trimmed, keeping the remainder in the last match
printfn "2h) Split into only two non-whitespace elements with whitespace trimmed:"
let result = s2.Split(stringSeparators, 2, StringSplitOptions.RemoveEmptyEntries ||| StringSplitOptions.TrimEntries)
show result

(*
This example produces the following results:

1) Split a string delimited by characters:

The original string is: ",ONE,, TWO,, , THREE,,".
The delimiter character is: ','.

1a) Return all elements:
The return value contains these 9 elements:
<><ONE><>< TWO><>< >< THREE><><>

1b) Return all elements with whitespace trimmed:
The return value contains these 9 elements:
<><ONE><><TWO><><><THREE><><>

1c) Return all non-empty elements:
The return value contains these 4 elements:
<ONE>< TWO>< >< THREE>

1d) Return all non-whitespace elements with whitespace trimmed:
The return value contains these 3 elements:
<ONE><TWO><THREE>

1e) Split into only two elements:
The return value contains these 2 elements:
<><ONE,, TWO,, , THREE,,>

1f) Split into only two elements with whitespace trimmed:
The return value contains these 2 elements:
<><ONE,, TWO,, , THREE,,>

1g) Split into only two non-empty elements:
The return value contains these 2 elements:
<ONE>< TWO,, , THREE,,>

1h) Split into only two non-whitespace elements with whitespace trimmed:
The return value contains these 2 elements:
<ONE><TWO,, , THREE,,>

2) Split a string delimited by another string:

The original string is: "[stop]ONE[stop] [stop]TWO  [stop][stop]  [stop]THREE[stop][stop]  ".
The delimiter string is: "[stop]".

2a) Return all elements:
The return value contains these 9 elements:
<><ONE>< ><TWO  ><><  ><THREE><><  >

2b) Return all elements with whitespace trimmed:
The return value contains these 9 elements:
<><ONE><><TWO><><><THREE><><>

2c) Return all non-empty elements:
The return value contains these 6 elements:
<ONE>< ><TWO  ><  ><THREE><  >

2d) Return all non-whitespace elements with whitespace trimmed:
The return value contains these 3 elements:
<ONE><TWO><THREE>

2e) Split into only two elements:
The return value contains these 2 elements:
<><ONE[stop] [stop]TWO  [stop][stop]  [stop]THREE[stop][stop]  >

2f) Split into only two elements with whitespace trimmed:
The return value contains these 2 elements:
<><ONE[stop] [stop]TWO  [stop][stop]  [stop]THREE[stop][stop]>

2g) Split into only two non-empty elements:
The return value contains these 2 elements:
<ONE>< [stop]TWO  [stop][stop]  [stop]THREE[stop][stop]  >

2h) Split into only two non-whitespace elements with whitespace trimmed:
The return value contains these 2 elements:
<ONE><TWO  [stop][stop]  [stop]THREE[stop][stop]>

*)

Public Shared Sub StringSplitOptionsExamples()
    ' This example demonstrates the String.Split() methods that use
    ' the StringSplitOptions enumeration.

    ' Example 1: Split a string delimited by characters
    Console.WriteLine("1) Split a string delimited by characters:" & vbCrLf)

    Dim s1 As String = ",ONE,, TWO,, , THREE,,"
    Dim charSeparators() As Char = {","c}
    Dim result() As String

    Console.WriteLine("The original string is: ""{0}"".", s1)
    Console.WriteLine("The delimiter character is: '{0}'." & vbCrLf, charSeparators(0))

    ' Split the string and return all elements
    Console.WriteLine("1a) Return all elements:")
    result = s1.Split(charSeparators, StringSplitOptions.None)
    Show(result)

    ' Split the string and return all elements with whitespace trimmed
    Console.WriteLine("1b) Return all elements with whitespace trimmed:")
    result = s1.Split(charSeparators, StringSplitOptions.TrimEntries)
    Show(result)

    ' Split the string and return all non-empty elements
    Console.WriteLine("1c) Return all non-empty elements:")
    result = s1.Split(charSeparators, StringSplitOptions.RemoveEmptyEntries)
    Show(result)

    ' Split the string and return all non-whitespace elements with whitespace trimmed
    Console.WriteLine("1d) Return all non-whitespace elements with whitespace trimmed:")
    result = s1.Split(charSeparators, StringSplitOptions.RemoveEmptyEntries Or StringSplitOptions.TrimEntries)
    Show(result)


    ' Split the string into only two elements, keeping the remainder in the last match
    Console.WriteLine("1e) Split into only two elements:")
    result = s1.Split(charSeparators, 2, StringSplitOptions.None)
    Show(result)

    ' Split the string into only two elements with whitespace trimmed, keeping the remainder in the last match
    Console.WriteLine("1f) Split into only two elements with whitespace trimmed:")
    result = s1.Split(charSeparators, 2, StringSplitOptions.TrimEntries)
    Show(result)

    ' Split the string into only two non-empty elements, keeping the remainder in the last match
    Console.WriteLine("1g) Split into only two non-empty elements:")
    result = s1.Split(charSeparators, 2, StringSplitOptions.RemoveEmptyEntries)
    Show(result)

    ' Split the string into only two non-whitespace elements with whitespace trimmed, keeping the remainder in the last match
    Console.WriteLine("1h) Split into only two non-whitespace elements with whitespace trimmed:")
    result = s1.Split(charSeparators, 2, StringSplitOptions.RemoveEmptyEntries Or StringSplitOptions.TrimEntries)
    Show(result)


    ' Example 2: Split a string delimited by another string
    Console.WriteLine("2) Split a string delimited by another string:" & vbCrLf)

    Dim s2 As String = "[stop]" +
                "ONE[stop] [stop]" +
                "TWO  [stop][stop]  [stop]" +
                "THREE[stop][stop]  "
    Dim stringSeparators() As String = {"[stop]"}


    Console.WriteLine("The original string is: ""{0}"".", s2)
    Console.WriteLine("The delimiter string is: ""{0}""." & vbCrLf, stringSeparators(0))

    ' Split the string and return all elements
    Console.WriteLine("2a) Return all elements:")
    result = s2.Split(stringSeparators, StringSplitOptions.None)
    Show(result)

    ' Split the string and return all elements with whitespace trimmed
    Console.WriteLine("2b) Return all elements with whitespace trimmed:")
    result = s2.Split(stringSeparators, StringSplitOptions.TrimEntries)
    Show(result)

    ' Split the string and return all non-empty elements
    Console.WriteLine("2c) Return all non-empty elements:")
    result = s2.Split(stringSeparators, StringSplitOptions.RemoveEmptyEntries)
    Show(result)

    ' Split the string and return all non-whitespace elements with whitespace trimmed
    Console.WriteLine("2d) Return all non-whitespace elements with whitespace trimmed:")
    result = s2.Split(stringSeparators, StringSplitOptions.RemoveEmptyEntries Or StringSplitOptions.TrimEntries)
    Show(result)


    ' Split the string into only two elements, keeping the remainder in the last match
    Console.WriteLine("2e) Split into only two elements:")
    result = s2.Split(stringSeparators, 2, StringSplitOptions.None)
    Show(result)

    ' Split the string into only two elements with whitespace trimmed, keeping the remainder in the last match
    Console.WriteLine("2f) Split into only two elements with whitespace trimmed:")
    result = s2.Split(stringSeparators, 2, StringSplitOptions.TrimEntries)
    Show(result)

    ' Split the string into only two non-empty elements, keeping the remainder in the last match
    Console.WriteLine("2g) Split into only two non-empty elements:")
    result = s2.Split(stringSeparators, 2, StringSplitOptions.RemoveEmptyEntries)
    Show(result)

    ' Split the string into only two non-whitespace elements with whitespace trimmed, keeping the remainder in the last match
    Console.WriteLine("2h) Split into only two non-whitespace elements with whitespace trimmed:")
    result = s2.Split(stringSeparators, 2, StringSplitOptions.RemoveEmptyEntries Or StringSplitOptions.TrimEntries)
    Show(result)

End Sub

' Display the array of separated strings.
Public Shared Sub Show(ByVal entries() As String)
    Console.WriteLine("The return value contains these {0} elements:", entries.Length)
    Dim entry As String
    For Each entry In entries
        Console.Write("<{0}>", entry)
    Next entry
    Console.Write(vbCrLf & vbCrLf)

End Sub

'This example produces the following results:
'
' 1) Split a string delimited by characters:
'
' The original string is: ",ONE,, TWO,, , THREE,,".
' The delimiter character is: ','.
'
' 1a) Return all elements:
' The return value contains these 9 elements:
' <><ONE><>< TWO><>< >< THREE><><>
'
' 1b) Return all elements with whitespace trimmed:
' The return value contains these 9 elements:
' <><ONE><><TWO><><><THREE><><>
'
' 1c) Return all non-empty elements:
' The return value contains these 4 elements:
' <ONE>< TWO>< >< THREE>
'
' 1d) Return all non-whitespace elements with whitespace trimmed:
' The return value contains these 3 elements:
' <ONE><TWO><THREE>
'
' 1e) Split into only two elements:
' The return value contains these 2 elements:
' <><ONE,, TWO,, , THREE,,>
'
' 1f) Split into only two elements with whitespace trimmed:
' The return value contains these 2 elements:
' <><ONE,, TWO,, , THREE,,>
'
' 1g) Split into only two non-empty elements:
' The return value contains these 2 elements:
' <ONE>< TWO,, , THREE,,>
'
' 1h) Split into only two non-whitespace elements with whitespace trimmed:
' The return value contains these 2 elements:
' <ONE><TWO,, , THREE,,>
'
' 2) Split a string delimited by another string:
'
' The original string is: "[stop]ONE[stop] [stop]TWO  [stop][stop]  [stop]THREE[stop][stop]  ".
' The delimiter string is: "[stop]".
'
' 2a) Return all elements:
' The return value contains these 9 elements:
' <><ONE>< ><TWO  ><><  ><THREE><><  >
'
' 2b) Return all elements with whitespace trimmed:
' The return value contains these 9 elements:
' <><ONE><><TWO><><><THREE><><>
'
' 2c) Return all non-empty elements:
' The return value contains these 6 elements:
' <ONE>< ><TWO  ><  ><THREE><  >
'
' 2d) Return all non-whitespace elements with whitespace trimmed:
' The return value contains these 3 elements:
' <ONE><TWO><THREE>
'
' 2e) Split into only two elements:
' The return value contains these 2 elements:
' <><ONE[stop] [stop]TWO  [stop][stop]  [stop]THREE[stop][stop]  >
'
' 2f) Split into only two elements with whitespace trimmed:
' The return value contains these 2 elements:
' <><ONE[stop] [stop]TWO  [stop][stop]  [stop]THREE[stop][stop]>
'
' 2g) Split into only two non-empty elements:
' The return value contains these 2 elements:
' <ONE>< [stop]TWO  [stop][stop]  [stop]THREE[stop][stop]  >
'
' 2h) Split into only two non-whitespace elements with whitespace trimmed:
' The return value contains these 2 elements:
' <ONE><TWO  [stop][stop]  [stop]THREE[stop][stop]>
'

備註

分隔符（陣列中的 separator 字元）不包含在回傳陣列的元素中。例如，若 separator 陣列包含字元「-」，且當前字串實例值為「aa-bb-cc」，則該方法回傳包含三個元素的陣列：「aa」、「bb」和「cc」。

如果這個實例不包含中 separator的任何字元，回傳的陣列就只包含一個包含該實例的元素。

若 options 參數為且 RemoveEmptyEntries 該實例長度為零，則方法回傳一個空陣列。

的 separator 每個元素定義一個獨立的分隔符，由單一字元組成。若 options 參數為 None，且有兩個分隔符相鄰，或在本實例的開始或結尾找到分隔符，則對應的陣列元素包含 String.Empty。例如，若separator包含兩個元素和 '_''-' ，字串實例值為「-_aa-_」，參數值options為 None，方法回傳包含以下五個元素的字串陣列：

String.Empty，代表索引0處「-」字元前的空字串。
String.Empty，代表位於索引 0 的「-」字元與索引 1 的「_」字元之間的空字串。
“aa”。
String.Empty，代表索引 4 中「-」字元後的空字串。
String.Empty，代表索引5中「_」字元後的空字串。

分隔符陣列

若 separator 參數為 null 或不包含任何字元，則假設空白字元為分隔符。空白字元由 Unicode 標準定義， Char.IsWhiteSpace 若被傳遞，方法會回傳 true 。

要通過 null 參數 char[] separator ，必須指定的 null 類型，以區分呼叫與其他過載，例如 Split(String[], StringSplitOptions)。下列範例示範數種方式來明確識別此多載。

string phrase = "The quick  brown fox";

_ = phrase.Split(default(char[]), StringSplitOptions.RemoveEmptyEntries);

_ = phrase.Split((char[]?)null, StringSplitOptions.RemoveEmptyEntries);

_ = phrase.Split(null as char[], StringSplitOptions.RemoveEmptyEntries);

let phrase = "The quick  brown fox"

phrase.Split(Unchecked.defaultof<char[]>, StringSplitOptions.RemoveEmptyEntries) |> ignore

phrase.Split(null :> char[], StringSplitOptions.RemoveEmptyEntries) |> ignore

phrase.Split((null: char[]), StringSplitOptions.RemoveEmptyEntries) |> ignore

Dim phrase As String = "The quick brown fox"
Dim words() As String

words = phrase.Split(TryCast(Nothing, Char()),
                       StringSplitOptions.RemoveEmptyEntries)

words = phrase.Split(New Char() {},
                     StringSplitOptions.RemoveEmptyEntries)

比較詳細數據

該 Split 方法會擷取此字串中由參數中一個或多個字 separator 元分隔的子串，並將這些子串作為陣列元素回傳。

效能考慮

給呼叫者的注意事項

適用於

Split(Char[], Int32)

來源:: String.Manipulation.cs

來源:: String.Manipulation.cs

來源:: String.Manipulation.cs

來源:: String.Manipulation.cs

根據指定的分隔字元，將字串分割成最大子字串數目。

public:
 cli::array <System::String ^> ^ Split(cli::array <char> ^ separator, int count);

public string[] Split(char[] separator, int count);

public string[] Split(char[]? separator, int count);

member this.Split : char[] * int -> string[]

Public Function Split (separator As Char(), count As Integer) As String()

參數

separator: Char[]

一個用來分隔該字串子串的字元陣列、一個不含分隔符的空陣列，或 null是。

count: Int32

要傳回的子字串數目上限。

傳回

String[]

一個陣列，其元素包含本實例中由一個或多個字 separator元界定的子串。如需詳細資訊，請參閱一節。

例外狀況

ArgumentOutOfRangeException

count 是負的。

範例

以下範例展示了如何 count 用來限制由 Split返回的字串數量。

string name = "Alex Johnson III";

string[] subs = name.Split(null, 2);

string firstName = subs[0];
string lastName;
if (subs.Length > 1)
{
    lastName = subs[1];
}

// firstName = "Alex"
// lastName = "Johnson III"

let name = "Alex Johnson III"

let subs = name.Split(null, 2)

let firstName = subs[0]
let lastName =
    if subs.Length > 1 then
        subs[1]
    else
        ""

// firstName = "Alex"
// lastName = "Johnson III"

Console.WriteLine("What is your name?")
Dim name As String = Console.ReadLine()

Dim substrings = name.Split(" "c, count:=2)
Dim firstName As String = substrings(0)
Dim lastName As String

If substrings.Length > 1 Then
    lastName = substrings(1)
End If

Console.WriteLine("firstName = ""{0}""", firstName)
Console.WriteLine("lastName = ""{0}""", lastName)

' If the user enters "Alex Johnson III":
' firstName = "Alex"
' lastName = "Johnson III"

備註

傳回數位元素中不包含分隔符。

如果這個實例不包含中 separator的任何字元，回傳的陣列就只包含一個包含該實例的元素。若 count 為零，則回傳一個空陣列。

若 separator 參數為 null 或不包含任何字元，則假設空白字元為分隔符。空白字元由 Unicode 標準定義， Char.IsWhiteSpace 若被傳遞，方法會回傳 true 。

每個 separator 元素定義一個獨立的分隔字元。如果兩個分隔符相鄰，或在此實例的開始或結尾找到分隔符，對應的陣列元素包含 Empty。

若此實例中子字串超過 count 數，前幾個 count - 1 子字串會回傳回回返回值的前幾個 count - 1 元素，剩餘字元則回傳回本值的最後一個元素。

若 count 大於子字串數量，則回傳可用子字串，且不拋出例外。

下表顯示一些範例。

語言	字串值	分隔符	傳回的陣列
C#	"42, 12, 19"	new Char[] {'，'， ' '}	{"42", "", "12", "", "19"}
Visual Basic	"42, 12, 19"	Char（） = {“，”c， “ ”c}）	{"42", "", "12", "", "19"}
C#	"42..12..19."	新角色[] {'.'}	{"42", "", "12", "", "19", ""}
Visual Basic	"42..12..19."	Char（） = {“.”c}	{"42", "", "12", "", "19", ""}
C#	“香蕉”	新角色[] {'.'}	{“香蕉”}
Visual Basic	“香蕉”	Char（） = {“.”c}	{“香蕉”}
C#	「Darb\nSmarba」	新角色[] {}	{“Darb”， “Smarba”}
Visual Basic	「Darb」與 vbLf 與「Smarba」	Char（） = {}	{“Darb”， “Smarba”}
C#	「Darb\nSmarba」	null	{“Darb”， “Smarba”}
Visual Basic	「Darb」與 vbLf 與「Smarba」	無	{“Darb”， “Smarba”}

效能考慮

給呼叫者的注意事項

另請參閱

適用於

Split(Char, StringSplitOptions)

來源:: String.Manipulation.cs

來源:: String.Manipulation.cs

來源:: String.Manipulation.cs

來源:: String.Manipulation.cs

根據指定的分隔字元，將字串分割成子字串，並選擇性地將字串分割成子字串。

public string[] Split(char separator, StringSplitOptions options = System.StringSplitOptions.None);

member this.Split : char * StringSplitOptions -> string[]

Public Function Split (separator As Char, Optional options As StringSplitOptions = System.StringSplitOptions.None) As String()

參數

separator: Char

分隔此字串中子字串的字元。

options: StringSplitOptions

列舉值的位元組合，指定是否要修剪子字串並包含空子字串。

傳回

String[]

一個陣列，其元素包含本實例中以為界隔 separator的子串。

適用於

Split(ReadOnlySpan<Char>)

來源:: String.Manipulation.cs

根據指定的分隔字元，將字串分割成子字串。

public:
 cli::array <System::String ^> ^ Split(ReadOnlySpan<char> separator);

public string[] Split(scoped ReadOnlySpan<char> separator);

member this.Split : ReadOnlySpan<char> -> string[]

Public Function Split (separator As ReadOnlySpan(Of Char)) As String()

參數

separator: ReadOnlySpan<Char>

分隔字元的範圍，或不含分隔符的空白範圍。

傳回

String[]

一個陣列，其元素包含本實例中由一個或多個字元 separator分隔的子串。

適用於

Split(Char[])

來源:: String.Manipulation.cs

來源:: String.Manipulation.cs

來源:: String.Manipulation.cs

來源:: String.Manipulation.cs

根據指定的分隔字元，將字串分割成子字串。

public:
 cli::array <System::String ^> ^ Split(... cli::array <char> ^ separator);

public string[] Split(params char[] separator);

public string[] Split(params char[]? separator);

member this.Split : char[] -> string[]

Public Function Split (ParamArray separator As Char()) As String()

參數

separator: Char[]

一個分隔字元的陣列、一個不含分隔符的空陣列，或 null。

傳回

String[]

一個陣列，其元素包含本實例中由一個或多個字元 separator分隔的子串。如需詳細資訊，請參閱一節。

範例

以下範例示範如何將空格字元（）和制表符\t（）視為分隔符，從文字區塊中提取單字。要分割的字串包含這兩個字元。

string s = "Today\tI'm going to school";
string[] subs = s.Split(' ', '\t');

foreach (var sub in subs)
{
    Console.WriteLine($"Substring: {sub}");
}

// This example produces the following output:
//
// Substring: Today
// Substring: I'm
// Substring: going
// Substring: to
// Substring: school

let s = "Today\tI'm going to school"
let subs = s.Split(' ', '\t')

for sub in subs do
    printfn $"Substring: {sub}"

// This example produces the following output:
//
// Substring: Today
// Substring: I'm
// Substring: going
// Substring: to
// Substring: school

Dim s As String = "Today" & vbTab & "I'm going to school"
Dim subs As String() = s.Split(" "c, Char.Parse(vbTab))

For Each substring In subs
    Console.WriteLine("Substring: " & substring)
Next

' This example produces the following output:
'
' Substring: Today
' Substring: I 'm
' Substring: going
' Substring: to
' Substring: school

備註

當字串被已知字元集合分隔時，你可以用這個 Split(Char[]) 方法將其分成子字串。

傳回數位元素中不包含分隔符。例如，如果分隔子陣列包含字元「-」，且目前字串實例的值為「aa-bb-cc」，該方法會回傳包含三個元素的陣列：「aa」、「bb」和「cc」。

如果這個實例不包含中 separator的任何字元，回傳的陣列就只包含一個包含該實例的元素。

每個 separator 元素定義一個獨立的分隔字元。若兩個分隔符相鄰，或在本實例的開始或結尾找到分隔符，則回傳陣列中對應的元素包含 Empty。

下表顯示一些範例。

語言	字串值	分隔符	傳回的陣列
C#	"42, 12, 19"	new Char[] {'，'， ' '}	{"42", "", "12", "", "19"}
Visual Basic	"42, 12, 19"	Char（） = {“，”c， “ ”c}）	{"42", "", "12", "", "19"}
C#	"42..12..19."	新角色[] {'.'}	{"42", "", "12", "", "19", ""}
Visual Basic	"42..12..19."	Char（） = {“.”c}	{"42", "", "12", "", "19", ""}
C#	“香蕉”	新角色[] {'.'}	{“香蕉”}
Visual Basic	“香蕉”	Char（） = {“.”c}	{“香蕉”}
C#	「Darb\nSmarba」	新角色[] {}	{“Darb”， “Smarba”}
Visual Basic	「Darb」與 vbLf 與「Smarba」	Char（） = {}	{“Darb”， “Smarba”}
C#	「Darb\nSmarba」	null	{“Darb”， “Smarba”}
Visual Basic	「Darb」與 vbLf 與「Smarba」	無	{“Darb”， “Smarba”}

分隔符陣列

分隔符的每個元素都會定義由單一字元組成的個別分隔符。

若參數 separator 為 null 或不包含任何字元，該方法將空白字元視為分隔符。空白字元由 Unicode 標準定義， Char.IsWhiteSpace 若傳達空白字元，該方法會回傳 true 。

String.Split（Char[]）和編譯程式多載解析

雖然這個超載 String.Split 的單一參數是一個字元陣列，但你可以用單一字元呼叫它，如下範例所示。

string value = "This is a short string.";
char delimiter = 's';
string[] substrings = value.Split(delimiter);
foreach (var substring in substrings)
    Console.WriteLine(substring);

// The example displays the following output:
//     Thi
//      i
//      a
//     hort
//     tring.

let value = "This is a short string."
let delimiter = 's'
let substrings = value.Split delimiter
for substring in substrings do
    printfn $"{substring}"

// The example displays the following output:
//     Thi
//      i
//      a
//     hort
//     tring.

    Dim value As String = "This is a short string."
    Dim delimiter As Char = "s"c
    Dim substrings() As String = value.Split(delimiter)
    For Each substring In substrings
        Console.WriteLine(substring)
    Next
End Sub

' The example displays the following output:
'
'     Thi
'      i
'      a
'     hort
'     tring.

由於 separator 參數以屬性裝飾 ParamArrayAttribute ，編譯器會將單一字元解讀為單一元素字元陣列。其他包含separator參數的超載則不然String.Split;你必須明確將這些超載以字元陣列作為separator參數傳遞。

比較詳細數據

此 Split(Char[]) 方法會擷取由陣列中一個或多個字 separator 元界定的子串，並將這些子串作為陣列的元素回傳。

此 Split(Char[]) 方法透過使用大小寫區分序數排序規則進行比較來尋找分隔符。欲了解更多關於字、字串及序數排序的資訊，請參閱列舉。System.Globalization.CompareOptions

效能考慮

這些方法會 Split 為回傳的陣列物件分配記憶體，並為每個陣列元素分配一個 String 物件。如果您的應用程式需要最佳效能，或記憶體配置管理對應用程式至關重要，請考慮使用 IndexOf OR IndexOfAny 方法。你也可以選擇用這個 Compare 方法在字串中尋找子字串。

要在分隔符處分割字串，請使用 IndexOf or IndexOfAny 方法定位字串中的分隔符。要在分隔符字串處分割字串，請使用 IndexOf or IndexOfAny 方法找到分隔符字串的第一個字元。接著用該 Compare 方法判斷該第一個字元後面的字元是否等於分隔字串的其餘字元。

給呼叫者的注意事項

另請參閱

適用於

Split(String, StringSplitOptions)

來源:: String.Manipulation.cs

來源:: String.Manipulation.cs

來源:: String.Manipulation.cs

來源:: String.Manipulation.cs

將字串分割成以提供的字串分隔符為基礎的子字串。

public string[] Split(string? separator, StringSplitOptions options = System.StringSplitOptions.None);

public string[] Split(string separator, StringSplitOptions options = System.StringSplitOptions.None);

member this.Split : string * StringSplitOptions -> string[]

Public Function Split (separator As String, Optional options As StringSplitOptions = System.StringSplitOptions.None) As String()

參數

separator: String

分隔此字串中子字串的字串。

options: StringSplitOptions

列舉值的位元組合，指定是否要修剪子字串並包含空子字串。

傳回

String[]

一個陣列，其元素包含本實例中以為界隔 separator的子串。

適用於

反饋

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分享方式

String.Split 方法

定義

多載

備註

例

Split(Rune, StringSplitOptions)

參數

傳回

適用於

Split(String[], Int32, StringSplitOptions)

參數

傳回

例外狀況

範例

備註

分隔符陣列

比較詳細數據

效能考慮

給呼叫者的注意事項

適用於

Split(Rune, Int32, StringSplitOptions)

參數

傳回

適用於

Split(Char[], Int32, StringSplitOptions)

參數

傳回

例外狀況

範例

備註

效能考慮

給呼叫者的注意事項

適用於

Split(Char, Int32, StringSplitOptions)

參數

傳回

備註

適用於

Split(String[], StringSplitOptions)

參數

傳回

例外狀況

範例

備註

分隔符陣列

比較詳細數據

效能考慮

給呼叫者的注意事項

適用於

Split(String, Int32, StringSplitOptions)

參數

傳回

備註

適用於

Split(Char[], StringSplitOptions)

參數

傳回

例外狀況

範例

備註

分隔符陣列

比較詳細數據

效能考慮

給呼叫者的注意事項

適用於

Split(Char[], Int32)

參數

傳回

例外狀況

範例

備註

效能考慮

給呼叫者的注意事項

另請參閱

適用於

Split(Char, StringSplitOptions)

參數

傳回

適用於

String.Split（Char[]）和編譯程式多載解析