StringSplitOptions Перечисление
Определение
Важно!
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Указывает параметры для применимых перегрузок метода Split, например, следует ли опускать пустые подстроки из возвращаемого массива или обрезать пробелы в подстроках.
Это перечисление поддерживает побитовую комбинацию значений его членов.
public enum class StringSplitOptions
[System.Flags]
public enum StringSplitOptions
[System.Flags]
[System.Runtime.InteropServices.ComVisible(false)]
public enum StringSplitOptions
[<System.Flags>]
type StringSplitOptions =
[<System.Flags>]
[<System.Runtime.InteropServices.ComVisible(false)>]
type StringSplitOptions =
Public Enum StringSplitOptions
- Наследование
- Атрибуты
Поля
None | 0 | Использовать параметры по умолчанию при разделении строк. |
RemoveEmptyEntries | 1 | Исключить элементы массива, содержащие пустые строки, из результата. Если параметры RemoveEmptyEntries и TrimEntries указаны одновременно, то из результата также удаляются подстроки, состоящие только из пробелов. |
TrimEntries | 2 | Обрезать пробелы в каждой подстроке результата. Это поле доступно только в .NET 5 и более поздних версиях. Если параметры RemoveEmptyEntries и TrimEntries указаны одновременно, то из результата также удаляются подстроки, состоящие только из пробелов. |
Примеры
В следующем примере показано, как StringSplitOptions
перечисление используется для включения или исключения подстрок, созданных методом String.Split :
// This example demonstrates the String.Split(Char[], Boolean) and
// String.Split(Char[], Int32, Boolean) methods
using namespace System;
void Show( array<String^>^entries )
{
Console::WriteLine( "The return value contains these {0} elements:", entries->Length );
System::Collections::IEnumerator^ myEnum = entries->GetEnumerator();
while ( myEnum->MoveNext() )
{
String^ entry = safe_cast<String^>(myEnum->Current);
Console::Write( "<{0}>", entry );
}
Console::Write( "{0}{0}", Environment::NewLine );
}
int main()
{
String^ s = ",one,,,two,,,,,three,,";
array<Char>^sep = gcnew array<Char>{
','
};
array<String^>^result;
//
Console::WriteLine( "The original string is \"{0}\".", s );
Console::WriteLine( "The separation character is '{0}'.", sep[ 0 ] );
Console::WriteLine();
//
Console::WriteLine( "Split the string and return all elements:" );
result = s->Split( sep, StringSplitOptions::None );
Show( result );
//
Console::WriteLine( "Split the string and return all non-empty elements:" );
result = s->Split( sep, StringSplitOptions::RemoveEmptyEntries );
Show( result );
//
Console::WriteLine( "Split the string and return 2 elements:" );
result = s->Split( sep, 2, StringSplitOptions::None );
Show( result );
//
Console::WriteLine( "Split the string and return 2 non-empty elements:" );
result = s->Split( sep, 2, StringSplitOptions::RemoveEmptyEntries );
Show( result );
}
/*
This example produces the following results:
The original string is ",one,,,two,,,,,three,,".
The separation character is ','.
Split the string and return all elements:
The return value contains these 12 elements:
<><one><><><two><><><><><three><><>
Split the string and return all non-empty elements:
The return value contains these 3 elements:
<one><two><three>
Split the string and return 2 elements:
The return value contains these 2 elements:
<><one,,,two,,,,,three,,>
Split the string and return 2 non-empty elements:
The return value contains these 2 elements:
<one><,,two,,,,,three,,>
*/
// This example demonstrates the String.Split() methods that use
// the StringSplitOptions enumeration.
string s1 = ",ONE,,TWO,,,THREE,,";
string s2 = "[stop]" +
"ONE[stop][stop]" +
"TWO[stop][stop][stop]" +
"THREE[stop][stop]";
char[] charSeparators = new char[] { ',' };
string[] stringSeparators = new string[] { "[stop]" };
string[] result;
// ------------------------------------------------------------------------------
// Split a string delimited by characters.
// ------------------------------------------------------------------------------
Console.WriteLine("1) Split a string delimited by characters:\n");
// Display the original string and delimiter characters.
Console.WriteLine($"1a) The original string is \"{s1}\".");
Console.WriteLine($"The delimiter character is '{charSeparators[0]}'.\n");
// Split a string delimited by characters and return all elements.
Console.WriteLine("1b) Split a string delimited by characters and " +
"return all elements:");
result = s1.Split(charSeparators, StringSplitOptions.None);
Show(result);
// Split a string delimited by characters and return all non-empty elements.
Console.WriteLine("1c) Split a string delimited by characters and " +
"return all non-empty elements:");
result = s1.Split(charSeparators, StringSplitOptions.RemoveEmptyEntries);
Show(result);
// Split the original string into the string and empty string before the
// delimiter and the remainder of the original string after the delimiter.
Console.WriteLine("1d) Split a string delimited by characters and " +
"return 2 elements:");
result = s1.Split(charSeparators, 2, StringSplitOptions.None);
Show(result);
// Split the original string into the string after the delimiter and the
// remainder of the original string after the delimiter.
Console.WriteLine("1e) Split a string delimited by characters and " +
"return 2 non-empty elements:");
result = s1.Split(charSeparators, 2, StringSplitOptions.RemoveEmptyEntries);
Show(result);
// ------------------------------------------------------------------------------
// Split a string delimited by another string.
// ------------------------------------------------------------------------------
Console.WriteLine("2) Split a string delimited by another string:\n");
// Display the original string and delimiter string.
Console.WriteLine($"2a) The original string is \"{s2}\".");
Console.WriteLine($"The delimiter string is \"{stringSeparators[0]}\".\n");
// Split a string delimited by another string and return all elements.
Console.WriteLine("2b) Split a string delimited by another string and " +
"return all elements:");
result = s2.Split(stringSeparators, StringSplitOptions.None);
Show(result);
// Split the original string at the delimiter and return all non-empty elements.
Console.WriteLine("2c) Split a string delimited by another string and " +
"return all non-empty elements:");
result = s2.Split(stringSeparators, StringSplitOptions.RemoveEmptyEntries);
Show(result);
// Split the original string into the empty string before the
// delimiter and the remainder of the original string after the delimiter.
Console.WriteLine("2d) Split a string delimited by another string and " +
"return 2 elements:");
result = s2.Split(stringSeparators, 2, StringSplitOptions.None);
Show(result);
// Split the original string into the string after the delimiter and the
// remainder of the original string after the delimiter.
Console.WriteLine("2e) Split a string delimited by another string and " +
"return 2 non-empty elements:");
result = s2.Split(stringSeparators, 2, StringSplitOptions.RemoveEmptyEntries);
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:
1a) The original string is ",ONE,,TWO,,,THREE,,".
The delimiter character is ','.
1b) Split a string delimited by characters and return all elements:
The return value contains these 9 elements:
<><ONE><><TWO><><><THREE><><>
1c) Split a string delimited by characters and return all non-empty elements:
The return value contains these 3 elements:
<ONE><TWO><THREE>
1d) Split a string delimited by characters and return 2 elements:
The return value contains these 2 elements:
<><ONE,,TWO,,,THREE,,>
1e) Split a string delimited by characters and return 2 non-empty elements:
The return value contains these 2 elements:
<ONE><TWO,,,THREE,,>
2) Split a string delimited by another string:
2a) The original string is "[stop]ONE[stop][stop]TWO[stop][stop][stop]THREE[stop][stop]".
The delimiter string is "[stop]".
2b) Split a string delimited by another string and return all elements:
The return value contains these 9 elements:
<><ONE><><TWO><><><THREE><><>
2c) Split a string delimited by another string and return all non-empty elements:
The return value contains these 3 elements:
<ONE><TWO><THREE>
2d) Split a string delimited by another string and return 2 elements:
The return value contains these 2 elements:
<><ONE[stop][stop]TWO[stop][stop][stop]THREE[stop][stop]>
2e) Split a string delimited by another string and return 2 non-empty elements:
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"
let s1 = ",ONE,,TWO,,,THREE,,"
let s2 = "[stop]" +
"ONE[stop][stop]" +
"TWO[stop][stop][stop]" +
"THREE[stop][stop]"
let charSeparators = [| ',' |]
let stringSeparators = [| "[stop]" |]
// ------------------------------------------------------------------------------
// Split a string delimited by characters.
// ------------------------------------------------------------------------------
printfn "1) Split a string delimited by characters:\n"
// Display the original string and delimiter characters.
printfn $"1a) The original string is \"{s1}\"."
printfn $"The delimiter character is '{charSeparators[0]}'.\n"
// Split a string delimited by characters and return all elements.
printfn "1b) Split a string delimited by characters and return all elements:"
let result = s1.Split(charSeparators, StringSplitOptions.None)
show result
// Split a string delimited by characters and return all non-empty elements.
printfn "1c) Split a string delimited by characters and return all non-empty elements:"
let result = s1.Split(charSeparators, StringSplitOptions.RemoveEmptyEntries)
show result
// Split the original string into the string and empty string before the
// delimiter and the remainder of the original string after the delimiter.
printfn "1d) Split a string delimited by characters and return 2 elements:"
let result = s1.Split(charSeparators, 2, StringSplitOptions.None)
show result
// Split the original string into the string after the delimiter and the
// remainder of the original string after the delimiter.
printfn "1e) Split a string delimited by characters and return 2 non-empty elements:"
let result = s1.Split(charSeparators, 2, StringSplitOptions.RemoveEmptyEntries)
show result
// ------------------------------------------------------------------------------
// Split a string delimited by another string.
// ------------------------------------------------------------------------------
printfn "2) Split a string delimited by another string:\n"
// Display the original string and delimiter string.
printfn $"2a) The original string is \"{s2}\"."
printfn $"The delimiter string is \"{stringSeparators[0]}\".\n"
// Split a string delimited by another string and return all elements.
printfn "2b) Split a string delimited by another string and return all elements:"
let result = s2.Split(stringSeparators, StringSplitOptions.None)
show result
// Split the original string at the delimiter and return all non-empty elements.
printfn "2c) Split a string delimited by another string and return all non-empty elements:"
let result = s2.Split(stringSeparators, StringSplitOptions.RemoveEmptyEntries)
show result
// Split the original string into the empty string before the
// delimiter and the remainder of the original string after the delimiter.
printfn "2d) Split a string delimited by another string and return 2 elements:"
let result = s2.Split(stringSeparators, 2, StringSplitOptions.None)
show result
// Split the original string into the string after the delimiter and the
// remainder of the original string after the delimiter.
printfn "2e) Split a string delimited by another string and return 2 non-empty elements:"
let result = s2.Split(stringSeparators, 2, StringSplitOptions.RemoveEmptyEntries)
show result
(*
This example produces the following results:
1) Split a string delimited by characters:
1a) The original string is ",ONE,,TWO,,,THREE,,".
The delimiter character is ','.
1b) Split a string delimited by characters and return all elements:
The return value contains these 9 elements:
<><ONE><><TWO><><><THREE><><>
1c) Split a string delimited by characters and return all non-empty elements:
The return value contains these 3 elements:
<ONE><TWO><THREE>
1d) Split a string delimited by characters and return 2 elements:
The return value contains these 2 elements:
<><ONE,,TWO,,,THREE,,>
1e) Split a string delimited by characters and return 2 non-empty elements:
The return value contains these 2 elements:
<ONE><TWO,,,THREE,,>
2) Split a string delimited by another string:
2a) The original string is "[stop]ONE[stop][stop]TWO[stop][stop][stop]THREE[stop][stop]".
The delimiter string is "[stop]".
2b) Split a string delimited by another string and return all elements:
The return value contains these 9 elements:
<><ONE><><TWO><><><THREE><><>
2c) Split a string delimited by another string and return all non-empty elements:
The return value contains these 3 elements:
<ONE><TWO><THREE>
2d) Split a string delimited by another string and return 2 elements:
The return value contains these 2 elements:
<><ONE[stop][stop]TWO[stop][stop][stop]THREE[stop][stop]>
2e) Split a string delimited by another string and return 2 non-empty elements:
The return value contains these 2 elements:
<ONE><TWO[stop][stop][stop]THREE[stop][stop]>
*)
Dim s1 As String = ",ONE,,TWO,,,THREE,,"
Dim s2 As String = "[stop]" &
"ONE[stop][stop]" &
"TWO[stop][stop][stop]" &
"THREE[stop][stop]"
Dim charSeparators() As Char = {","c}
Dim stringSeparators() As String = {"[stop]"}
Dim result() As String
' ------------------------------------------------------------------------------
' Split a string delimited by characters.
' ------------------------------------------------------------------------------
Console.WriteLine("1) Split a string delimited by characters:" & vbCrLf)
' Display the original string and delimiter characters.
Console.WriteLine("1a) The original string is ""{0}"".", s1)
Console.WriteLine("The delimiter character is '{0}'." & vbCrLf, charSeparators(0))
' Split a string delimited by characters and return all elements.
Console.WriteLine("1b) Split a string delimited by characters and " &
"return all elements:")
result = s1.Split(charSeparators, StringSplitOptions.None)
Show(result)
' Split a string delimited by characters and return all non-empty elements.
Console.WriteLine("1c) Split a string delimited by characters and " &
"return all non-empty elements:")
result = s1.Split(charSeparators, StringSplitOptions.RemoveEmptyEntries)
Show(result)
' Split the original string into the string and empty string before the
' delimiter and the remainder of the original string after the delimiter.
Console.WriteLine("1d) Split a string delimited by characters and " &
"return 2 elements:")
result = s1.Split(charSeparators, 2, StringSplitOptions.None)
Show(result)
' Split the original string into the string after the delimiter and the
' remainder of the original string after the delimiter.
Console.WriteLine("1e) Split a string delimited by characters and " &
"return 2 non-empty elements:")
result = s1.Split(charSeparators, 2, StringSplitOptions.RemoveEmptyEntries)
Show(result)
' ------------------------------------------------------------------------------
' Split a string delimited by another string.
' ------------------------------------------------------------------------------
Console.WriteLine("2) Split a string delimited by another string:" & vbCrLf)
' Display the original string and delimiter string.
Console.WriteLine("2a) The original string is ""{0}"".", s2)
Console.WriteLine("The delimiter string is ""{0}""." & vbCrLf, stringSeparators(0))
' Split a string delimited by another string and return all elements.
Console.WriteLine("2b) Split a string delimited by another string and " &
"return all elements:")
result = s2.Split(stringSeparators, StringSplitOptions.None)
Show(result)
' Split the original string at the delimiter and return all non-empty elements.
Console.WriteLine("2c) Split a string delimited by another string and " &
"return all non-empty elements:")
result = s2.Split(stringSeparators, StringSplitOptions.RemoveEmptyEntries)
Show(result)
' Split the original string into the empty string before the
' delimiter and the remainder of the original string after the delimiter.
Console.WriteLine("2d) Split a string delimited by another string and " &
"return 2 elements:")
result = s2.Split(stringSeparators, 2, StringSplitOptions.None)
Show(result)
' Split the original string into the string after the delimiter and the
' remainder of the original string after the delimiter.
Console.WriteLine("2e) Split a string delimited by another string and " &
"return 2 non-empty elements:")
result = s2.Split(stringSeparators, 2, StringSplitOptions.RemoveEmptyEntries)
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:
'
'1a) The original string is ",ONE,,TWO,,,THREE,,".
'The delimiter character is ','.
'
'1b) Split a string delimited by characters and return all elements:
'The return value contains these 9 elements:
'<><ONE><><TWO><><><THREE><><>
'
'1c) Split a string delimited by characters and return all non-empty elements:
'The return value contains these 3 elements:
'<ONE><TWO><THREE>
'
'1d) Split a string delimited by characters and return 2 elements:
'The return value contains these 2 elements:
'<><ONE,,TWO,,,THREE,,>
'
'1e) Split a string delimited by characters and return 2 non-empty elements:
'The return value contains these 2 elements:
'<ONE><TWO,,,THREE,,>
'
'2) Split a string delimited by another string:
'
'2a) The original string is "[stop]ONE[stop][stop]TWO[stop][stop][stop]THREE[stop][stop]".
'The delimiter string is "[stop]".
'
'2b) Split a string delimited by another string and return all elements:
'The return value contains these 9 elements:
'<><ONE><><TWO><><><THREE><><>
'
'2c) Split a string delimited by another string and return all non-empty elements:
'The return value contains these 3 elements:
'<ONE><TWO><THREE>
'
'2d) Split a string delimited by another string and return 2 elements:
'The return value contains these 2 elements:
'<><ONE[stop][stop]TWO[stop][stop][stop]THREE[stop][stop]>
'
'2e) Split a string delimited by another string and return 2 non-empty elements:
'The return value contains these 2 elements:
'<ONE><TWO[stop][stop][stop]THREE[stop][stop]>
'
Комментарии
Метод String.Split возвращает массив подстрок в заданной строке, разделенный указанными символами или строками. Смежные разделители выдают элемент массива, содержащий пустую строку (""
). Одно из полей перечисления StringSplitOptions
указывает, должен ли элемент, содержащий пустую строку, включаться в возвращаемый массив.
None
Укажите поле для вызова поведения String.Split метода по умолчанию, которое не требует обрезки пробелов и включения пустых подстрок.
Поле TrimEntries
доступно только в .NET 5 и более поздних версиях.
Применяется к
См. также раздел
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