Array.LastIndexOf 方法

參考

定義

命名空間:: System

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。

傳回一維 Array 或 Array部分中最後一次出現之值的索引。

多載

LastIndexOf(Array, Object)	搜尋指定的物件，並傳回整個一維 Array中最後一次出現的索引。
LastIndexOf(Array, Object, Int32)	搜尋指定的物件，並傳回從第一個元素延伸至指定索引之一維 Array 中最後一個出現專案的索引。
LastIndexOf(Array, Object, Int32, Int32)	搜尋指定的物件，並傳回一維 Array 中元素範圍中最後一個出現專案的索引，其中包含指定的項目數目，並在指定的索引處結束。
LastIndexOf<T>(T[], T)	搜尋指定的物件，並傳回整個 Array中最後一個出現的索引。
LastIndexOf<T>(T[], T, Int32)	搜尋指定的物件，並傳回從第一個元素延伸至指定索引之 Array 中最後一個出現專案的索引。
LastIndexOf<T>(T[], T, Int32, Int32)	搜尋指定的物件，並傳回在包含指定項目數目且結束於指定索引之 Array 中最後一個出現專案的索引。

LastIndexOf(Array, Object)

來源:: Array.cs

來源:: Array.cs

來源:: Array.cs

搜尋指定的物件，並傳回整個一維 Array中最後一次出現的索引。

public:
 static int LastIndexOf(Array ^ array, System::Object ^ value);

public static int LastIndexOf (Array array, object value);

public static int LastIndexOf (Array array, object? value);

static member LastIndexOf : Array * obj -> int

Public Shared Function LastIndexOf (array As Array, value As Object) As Integer

參數

array: Array

要搜尋的一維 Array。

value: Object

在 array中尋找的物件。

傳回

Int32

如果找到，則為整個 array內最後一個出現 value 的索引;否則，陣列的下限減 1。

例外狀況

ArgumentNullException

array null。

RankException

array 是多維度。

範例

下列程式代碼範例示範如何判斷數位中最後出現指定元素的索引。

using namespace System;
void PrintIndexAndValues( Array^ myArray );

void main()
{
   // Creates and initializes a new Array instance with three elements of the same value.
   Array^ myArray = Array::CreateInstance( String::typeid, 12 );
   myArray->SetValue( "the", 0 );
   myArray->SetValue( "quick", 1 );
   myArray->SetValue( "brown", 2 );
   myArray->SetValue( "fox", 3 );
   myArray->SetValue( "jumps", 4 );
   myArray->SetValue( "over", 5 );
   myArray->SetValue( "the", 6 );
   myArray->SetValue( "lazy", 7 );
   myArray->SetValue( "dog", 8 );
   myArray->SetValue( "in", 9 );
   myArray->SetValue( "the", 10 );
   myArray->SetValue( "barn", 11 );

   // Displays the values of the Array.
   Console::WriteLine(  "The Array instance contains the following values:" );
   PrintIndexAndValues( myArray );

   // Searches for the last occurrence of the duplicated value.
   String^ myString =  "the";
   int myIndex = Array::LastIndexOf( myArray, myString );
   Console::WriteLine(  "The last occurrence of \"{0}\" is at index {1}.", myString, myIndex );

   // Searches for the last occurrence of the duplicated value in the first section of the Array.
   myIndex = Array::LastIndexOf( myArray, myString, 8 );
   Console::WriteLine(  "The last occurrence of \"{0}\" between the start and index 8 is at index {1}.", myString, myIndex );

   // Searches for the last occurrence of the duplicated value in a section of the Array.  
   // Note that the start index is greater than the end index because the search is done backward.
   myIndex = Array::LastIndexOf( myArray, myString, 10, 6 );
   Console::WriteLine(  "The last occurrence of \"{0}\" between index 5 and index 10 is at index {1}.", myString, myIndex );
}

void PrintIndexAndValues( Array^ myArray )
{
   for ( int i = myArray->GetLowerBound( 0 ); i <= myArray->GetUpperBound( 0 ); i++ )
      Console::WriteLine(  "\t[{0}]:\t{1}", i, myArray->GetValue( i ) );
}

/* 
 This code produces the following output.
 
 The Array instance contains the following values:
     [0]:    the
     [1]:    quick
     [2]:    brown
     [3]:    fox
     [4]:    jumps
     [5]:    over
     [6]:    the
     [7]:    lazy
     [8]:    dog
     [9]:    in
     [10]:    the
     [11]:    barn
 The last occurrence of "the" is at index 10.
 The last occurrence of "the" between the start and index 8 is at index 6.
 The last occurrence of "the" between index 5 and index 10 is at index 10.
 */

let printIndexAndValues (arr: 'a []) =
   for i = arr.GetLowerBound 0 to arr.GetUpperBound 0 do
      printfn $"\t[{i}]:\t{arr[i]}"

// Creates and initializes a new Array with three elements of the same value.
let myArray = 
   [| "the"; "quick"; "brown"; "fox"
      "jumps"; "over"; "the"; "lazy"
      "dog"; "in"; "the"; "barn" |]

// Displays the values of the Array.
printfn "The Array contains the following values:"
printIndexAndValues myArray

// Searches for the last occurrence of the duplicated value.
let myString = "the"
let myIndex = Array.LastIndexOf(myArray, myString)
printfn $"The last occurrence of \"{myString}\" is at index {myIndex}."

// Searches for the last occurrence of the duplicated value in the first section of the Array.
let myIndex = Array.LastIndexOf(myArray, myString, 8)
printfn $"The last occurrence of \"{myString}\" between the start and index 8 is at index {myIndex}."

// Searches for the last occurrence of the duplicated value in a section of the Array.
// Note that the start index is greater than the end index because the search is done backward.
let myIndex = Array.LastIndexOf( myArray, myString, 10, 6 )
printfn $"The last occurrence of \"{myString}\" between index 5 and index 10 is at index {myIndex}."


//      This code produces the following output.
//
//      The Array contains the following values:
//         [0]:    the
//         [1]:    quick
//         [2]:    brown
//         [3]:    fox
//         [4]:    jumps
//         [5]:    over
//         [6]:    the
//         [7]:    lazy
//         [8]:    dog
//         [9]:    in
//         [10]:    the
//         [11]:    barn
//      The last occurrence of "the" is at index 10.
//      The last occurrence of "the" between the start and index 8 is at index 6.
//      The last occurrence of "the" between index 5 and index 10 is at index 10.

// Creates and initializes a new Array with three elements of the same value.
Array myArray=Array.CreateInstance( typeof(string), 12 );
myArray.SetValue( "the", 0 );
myArray.SetValue( "quick", 1 );
myArray.SetValue( "brown", 2 );
myArray.SetValue( "fox", 3 );
myArray.SetValue( "jumps", 4 );
myArray.SetValue( "over", 5 );
myArray.SetValue( "the", 6 );
myArray.SetValue( "lazy", 7 );
myArray.SetValue( "dog", 8 );
myArray.SetValue( "in", 9 );
myArray.SetValue( "the", 10 );
myArray.SetValue( "barn", 11 );

// Displays the values of the Array.
Console.WriteLine( "The Array contains the following values:" );
PrintIndexAndValues( myArray );

// Searches for the last occurrence of the duplicated value.
string myString = "the";
int myIndex = Array.LastIndexOf( myArray, myString );
Console.WriteLine( "The last occurrence of \"{0}\" is at index {1}.", myString, myIndex );

// Searches for the last occurrence of the duplicated value in the first section of the Array.
myIndex = Array.LastIndexOf( myArray, myString, 8 );
Console.WriteLine( "The last occurrence of \"{0}\" between the start and index 8 is at index {1}.", myString, myIndex );

// Searches for the last occurrence of the duplicated value in a section of the Array.
// Note that the start index is greater than the end index because the search is done backward.
myIndex = Array.LastIndexOf( myArray, myString, 10, 6 );
Console.WriteLine( "The last occurrence of \"{0}\" between index 5 and index 10 is at index {1}.", myString, myIndex );

void PrintIndexAndValues( Array anArray )  {
   for ( int i = anArray.GetLowerBound(0); i <= anArray.GetUpperBound(0); i++ )
      Console.WriteLine( "\t[{0}]:\t{1}", i, anArray.GetValue( i ) );
}

/*
This code produces the following output.

The Array contains the following values:
   [0]:    the
   [1]:    quick
   [2]:    brown
   [3]:    fox
   [4]:    jumps
   [5]:    over
   [6]:    the
   [7]:    lazy
   [8]:    dog
   [9]:    in
   [10]:    the
   [11]:    barn
The last occurrence of "the" is at index 10.
The last occurrence of "the" between the start and index 8 is at index 6.
The last occurrence of "the" between index 5 and index 10 is at index 10.
*/

Public Class SamplesArray    
    
    Public Shared Sub Main()
        
        ' Creates and initializes a new Array with three elements of
        ' the same value.
        Dim myArray As Array = Array.CreateInstance(GetType(String), 12)
        myArray.SetValue("the", 0)
        myArray.SetValue("quick", 1)
        myArray.SetValue("brown", 2)
        myArray.SetValue("fox", 3)
        myArray.SetValue("jumps", 4)
        myArray.SetValue("over", 5)
        myArray.SetValue("the", 6)
        myArray.SetValue("lazy", 7)
        myArray.SetValue("dog", 8)
        myArray.SetValue("in", 9)
        myArray.SetValue("the", 10)
        myArray.SetValue("barn", 11)
        
        ' Displays the values of the Array.
        Console.WriteLine("The Array contains the following values:")
        PrintIndexAndValues(myArray)
        
        ' Searches for the last occurrence of the duplicated value.
        Dim myString As String = "the"
        Dim myIndex As Integer = Array.LastIndexOf(myArray, myString)
        Console.WriteLine("The last occurrence of ""{0}"" is at index {1}.", _
           myString, myIndex)
        
        ' Searches for the last occurrence of the duplicated value in the first
        ' section of the Array.
        myIndex = Array.LastIndexOf(myArray, myString, 8)
        Console.WriteLine("The last occurrence of ""{0}"" between the start " _
           + "and index 8 is at index {1}.", myString, myIndex)
        
        ' Searches for the last occurrence of the duplicated value in a section
        ' of the Array.  Note that the start index is greater than the end
        ' index because the search is done backward.
        myIndex = Array.LastIndexOf(myArray, myString, 10, 6)
        Console.WriteLine("The last occurrence of ""{0}"" between index 5 " _
           + "and index 10 is at index {1}.", myString, myIndex)
    End Sub
    
    
    Public Shared Sub PrintIndexAndValues(myArray As Array)
        Dim i As Integer
        For i = myArray.GetLowerBound(0) To myArray.GetUpperBound(0)
            Console.WriteLine(ControlChars.Tab + "[{0}]:" + ControlChars.Tab _
               + "{1}", i, myArray.GetValue(i))
        Next i
    End Sub
End Class

' This code produces the following output.
' 
' The Array contains the following values:
'     [0]:    the
'     [1]:    quick
'     [2]:    brown
'     [3]:    fox
'     [4]:    jumps
'     [5]:    over
'     [6]:    the
'     [7]:    lazy
'     [8]:    dog
'     [9]:    in
'     [10]:    the
'     [11]:    barn
' The last occurrence of "the" is at index 10.
' The last occurrence of "the" between the start and index 8 is at index 6.
' The last occurrence of "the" between index 5 and index 10 is at index 10.

備註

一維 Array 從最後一個專案往後搜尋，最後一個項目結束。

專案會使用 Object.Equals 方法，與指定的值進行比較。如果專案類型是非內建型別（使用者定義）型別，則會使用該類型的 Equals 實作。

由於大多數陣列的下限為零，因此當找不到 value 時，此方法通常會傳回 -1。在罕見的情況下，陣列的下限等於 Int32.MinValue 且找不到 value，這個方法會傳回 Int32.MaxValue，也就是 System.Int32.MinValue - 1。

這個方法是 O（n）作業，其中 n 是 array的 Length。

在 .NET Framework 2.0 和更新版本中，這個方法會使用 Array Equals 和 CompareTo 方法來判斷 value 參數指定的 Object 是否存在。在舊版的 .NET Framework 中，使用 valueObject 本身的 Equals 和 CompareTo 方法來進行此判斷。

CompareTo 集合中物件上 item 參數的方法。

另請參閱

IndexOf
在陣列中執行 Culture-Insensitive 字串作業

適用於

LastIndexOf(Array, Object, Int32)

來源:: Array.cs

來源:: Array.cs

來源:: Array.cs

搜尋指定的物件，並傳回從第一個元素延伸至指定索引之一維 Array 中最後一個出現專案的索引。

public:
 static int LastIndexOf(Array ^ array, System::Object ^ value, int startIndex);

public static int LastIndexOf (Array array, object value, int startIndex);

public static int LastIndexOf (Array array, object? value, int startIndex);

static member LastIndexOf : Array * obj * int -> int

Public Shared Function LastIndexOf (array As Array, value As Object, startIndex As Integer) As Integer

參數

array: Array

要搜尋的一維 Array。

value: Object

在 array中尋找的物件。

startIndex: Int32

回溯搜尋的起始索引。

傳回

Int32

array 中專案範圍中最後一次出現 value 的索引，如果找到，則從第一個專案延伸至 startIndex;否則，陣列的下限減 1。

例外狀況

ArgumentNullException

array null。

ArgumentOutOfRangeException

startIndex 超出 array的有效索引範圍。

RankException

array 是多維度。

範例

下列程式代碼範例示範如何判斷數位中最後出現指定元素的索引。

using namespace System;
void PrintIndexAndValues( Array^ myArray );

void main()
{
   // Creates and initializes a new Array instance with three elements of the same value.
   Array^ myArray = Array::CreateInstance( String::typeid, 12 );
   myArray->SetValue( "the", 0 );
   myArray->SetValue( "quick", 1 );
   myArray->SetValue( "brown", 2 );
   myArray->SetValue( "fox", 3 );
   myArray->SetValue( "jumps", 4 );
   myArray->SetValue( "over", 5 );
   myArray->SetValue( "the", 6 );
   myArray->SetValue( "lazy", 7 );
   myArray->SetValue( "dog", 8 );
   myArray->SetValue( "in", 9 );
   myArray->SetValue( "the", 10 );
   myArray->SetValue( "barn", 11 );

   // Displays the values of the Array.
   Console::WriteLine(  "The Array instance contains the following values:" );
   PrintIndexAndValues( myArray );

   // Searches for the last occurrence of the duplicated value.
   String^ myString =  "the";
   int myIndex = Array::LastIndexOf( myArray, myString );
   Console::WriteLine(  "The last occurrence of \"{0}\" is at index {1}.", myString, myIndex );

   // Searches for the last occurrence of the duplicated value in the first section of the Array.
   myIndex = Array::LastIndexOf( myArray, myString, 8 );
   Console::WriteLine(  "The last occurrence of \"{0}\" between the start and index 8 is at index {1}.", myString, myIndex );

   // Searches for the last occurrence of the duplicated value in a section of the Array.  
   // Note that the start index is greater than the end index because the search is done backward.
   myIndex = Array::LastIndexOf( myArray, myString, 10, 6 );
   Console::WriteLine(  "The last occurrence of \"{0}\" between index 5 and index 10 is at index {1}.", myString, myIndex );
}

void PrintIndexAndValues( Array^ myArray )
{
   for ( int i = myArray->GetLowerBound( 0 ); i <= myArray->GetUpperBound( 0 ); i++ )
      Console::WriteLine(  "\t[{0}]:\t{1}", i, myArray->GetValue( i ) );
}

/* 
 This code produces the following output.
 
 The Array instance contains the following values:
     [0]:    the
     [1]:    quick
     [2]:    brown
     [3]:    fox
     [4]:    jumps
     [5]:    over
     [6]:    the
     [7]:    lazy
     [8]:    dog
     [9]:    in
     [10]:    the
     [11]:    barn
 The last occurrence of "the" is at index 10.
 The last occurrence of "the" between the start and index 8 is at index 6.
 The last occurrence of "the" between index 5 and index 10 is at index 10.
 */

let printIndexAndValues (arr: 'a []) =
   for i = arr.GetLowerBound 0 to arr.GetUpperBound 0 do
      printfn $"\t[{i}]:\t{arr[i]}"

// Creates and initializes a new Array with three elements of the same value.
let myArray = 
   [| "the"; "quick"; "brown"; "fox"
      "jumps"; "over"; "the"; "lazy"
      "dog"; "in"; "the"; "barn" |]

// Displays the values of the Array.
printfn "The Array contains the following values:"
printIndexAndValues myArray

// Searches for the last occurrence of the duplicated value.
let myString = "the"
let myIndex = Array.LastIndexOf(myArray, myString)
printfn $"The last occurrence of \"{myString}\" is at index {myIndex}."

// Searches for the last occurrence of the duplicated value in the first section of the Array.
let myIndex = Array.LastIndexOf(myArray, myString, 8)
printfn $"The last occurrence of \"{myString}\" between the start and index 8 is at index {myIndex}."

// Searches for the last occurrence of the duplicated value in a section of the Array.
// Note that the start index is greater than the end index because the search is done backward.
let myIndex = Array.LastIndexOf( myArray, myString, 10, 6 )
printfn $"The last occurrence of \"{myString}\" between index 5 and index 10 is at index {myIndex}."


//      This code produces the following output.
//
//      The Array contains the following values:
//         [0]:    the
//         [1]:    quick
//         [2]:    brown
//         [3]:    fox
//         [4]:    jumps
//         [5]:    over
//         [6]:    the
//         [7]:    lazy
//         [8]:    dog
//         [9]:    in
//         [10]:    the
//         [11]:    barn
//      The last occurrence of "the" is at index 10.
//      The last occurrence of "the" between the start and index 8 is at index 6.
//      The last occurrence of "the" between index 5 and index 10 is at index 10.

// Creates and initializes a new Array with three elements of the same value.
Array myArray=Array.CreateInstance( typeof(string), 12 );
myArray.SetValue( "the", 0 );
myArray.SetValue( "quick", 1 );
myArray.SetValue( "brown", 2 );
myArray.SetValue( "fox", 3 );
myArray.SetValue( "jumps", 4 );
myArray.SetValue( "over", 5 );
myArray.SetValue( "the", 6 );
myArray.SetValue( "lazy", 7 );
myArray.SetValue( "dog", 8 );
myArray.SetValue( "in", 9 );
myArray.SetValue( "the", 10 );
myArray.SetValue( "barn", 11 );

// Displays the values of the Array.
Console.WriteLine( "The Array contains the following values:" );
PrintIndexAndValues( myArray );

// Searches for the last occurrence of the duplicated value.
string myString = "the";
int myIndex = Array.LastIndexOf( myArray, myString );
Console.WriteLine( "The last occurrence of \"{0}\" is at index {1}.", myString, myIndex );

// Searches for the last occurrence of the duplicated value in the first section of the Array.
myIndex = Array.LastIndexOf( myArray, myString, 8 );
Console.WriteLine( "The last occurrence of \"{0}\" between the start and index 8 is at index {1}.", myString, myIndex );

// Searches for the last occurrence of the duplicated value in a section of the Array.
// Note that the start index is greater than the end index because the search is done backward.
myIndex = Array.LastIndexOf( myArray, myString, 10, 6 );
Console.WriteLine( "The last occurrence of \"{0}\" between index 5 and index 10 is at index {1}.", myString, myIndex );

void PrintIndexAndValues( Array anArray )  {
   for ( int i = anArray.GetLowerBound(0); i <= anArray.GetUpperBound(0); i++ )
      Console.WriteLine( "\t[{0}]:\t{1}", i, anArray.GetValue( i ) );
}

/*
This code produces the following output.

The Array contains the following values:
   [0]:    the
   [1]:    quick
   [2]:    brown
   [3]:    fox
   [4]:    jumps
   [5]:    over
   [6]:    the
   [7]:    lazy
   [8]:    dog
   [9]:    in
   [10]:    the
   [11]:    barn
The last occurrence of "the" is at index 10.
The last occurrence of "the" between the start and index 8 is at index 6.
The last occurrence of "the" between index 5 and index 10 is at index 10.
*/

Public Class SamplesArray    
    
    Public Shared Sub Main()
        
        ' Creates and initializes a new Array with three elements of
        ' the same value.
        Dim myArray As Array = Array.CreateInstance(GetType(String), 12)
        myArray.SetValue("the", 0)
        myArray.SetValue("quick", 1)
        myArray.SetValue("brown", 2)
        myArray.SetValue("fox", 3)
        myArray.SetValue("jumps", 4)
        myArray.SetValue("over", 5)
        myArray.SetValue("the", 6)
        myArray.SetValue("lazy", 7)
        myArray.SetValue("dog", 8)
        myArray.SetValue("in", 9)
        myArray.SetValue("the", 10)
        myArray.SetValue("barn", 11)
        
        ' Displays the values of the Array.
        Console.WriteLine("The Array contains the following values:")
        PrintIndexAndValues(myArray)
        
        ' Searches for the last occurrence of the duplicated value.
        Dim myString As String = "the"
        Dim myIndex As Integer = Array.LastIndexOf(myArray, myString)
        Console.WriteLine("The last occurrence of ""{0}"" is at index {1}.", _
           myString, myIndex)
        
        ' Searches for the last occurrence of the duplicated value in the first
        ' section of the Array.
        myIndex = Array.LastIndexOf(myArray, myString, 8)
        Console.WriteLine("The last occurrence of ""{0}"" between the start " _
           + "and index 8 is at index {1}.", myString, myIndex)
        
        ' Searches for the last occurrence of the duplicated value in a section
        ' of the Array.  Note that the start index is greater than the end
        ' index because the search is done backward.
        myIndex = Array.LastIndexOf(myArray, myString, 10, 6)
        Console.WriteLine("The last occurrence of ""{0}"" between index 5 " _
           + "and index 10 is at index {1}.", myString, myIndex)
    End Sub
    
    
    Public Shared Sub PrintIndexAndValues(myArray As Array)
        Dim i As Integer
        For i = myArray.GetLowerBound(0) To myArray.GetUpperBound(0)
            Console.WriteLine(ControlChars.Tab + "[{0}]:" + ControlChars.Tab _
               + "{1}", i, myArray.GetValue(i))
        Next i
    End Sub
End Class

' This code produces the following output.
' 
' The Array contains the following values:
'     [0]:    the
'     [1]:    quick
'     [2]:    brown
'     [3]:    fox
'     [4]:    jumps
'     [5]:    over
'     [6]:    the
'     [7]:    lazy
'     [8]:    dog
'     [9]:    in
'     [10]:    the
'     [11]:    barn
' The last occurrence of "the" is at index 10.
' The last occurrence of "the" between the start and index 8 is at index 6.
' The last occurrence of "the" between index 5 and index 10 is at index 10.

備註

一維 Array 從 startIndex 往後搜尋，並結束於第一個專案。

專案會使用 Object.Equals 方法，與指定的值進行比較。如果專案類型是非內建型別（使用者定義）型別，則會使用該類型的 Equals 實作。

此方法是 O（n）作業，其中 n 是從 array 開頭到 startIndex的項目數目。

另請參閱

IndexOf
在陣列中執行 Culture-Insensitive 字串作業

適用於

LastIndexOf(Array, Object, Int32, Int32)

來源:: Array.cs

來源:: Array.cs

來源:: Array.cs

搜尋指定的物件，並傳回一維 Array 中元素範圍中最後一個出現專案的索引，其中包含指定的項目數目，並在指定的索引處結束。

public:
 static int LastIndexOf(Array ^ array, System::Object ^ value, int startIndex, int count);

public static int LastIndexOf (Array array, object value, int startIndex, int count);

public static int LastIndexOf (Array array, object? value, int startIndex, int count);

static member LastIndexOf : Array * obj * int * int -> int

Public Shared Function LastIndexOf (array As Array, value As Object, startIndex As Integer, count As Integer) As Integer

參數

array: Array

要搜尋的一維 Array。

value: Object

在 array中尋找的物件。

startIndex: Int32

回溯搜尋的起始索引。

count: Int32

要搜尋之區段中的項目數目。

傳回

Int32

array 中專案範圍中最後出現 value 的索引，其中包含 count 中指定的項目數目，並在找到時結束於 startIndex;否則，陣列的下限減 1。

例外狀況

ArgumentNullException

array null。

ArgumentOutOfRangeException

startIndex 超出 array的有效索引範圍。

-或-

count 小於零。

-或-

startIndex 和 count 未在 array中指定有效的區段。

RankException

array 是多維度。

範例

下列程式代碼範例示範如何判斷數位中最後出現指定元素的索引。請注意，LastIndexOf 方法是回溯搜尋;因此，count 必須小於或等於（startIndex 減去陣列的下限加上 1）。

using namespace System;
void PrintIndexAndValues( Array^ myArray );

void main()
{
   // Creates and initializes a new Array instance with three elements of the same value.
   Array^ myArray = Array::CreateInstance( String::typeid, 12 );
   myArray->SetValue( "the", 0 );
   myArray->SetValue( "quick", 1 );
   myArray->SetValue( "brown", 2 );
   myArray->SetValue( "fox", 3 );
   myArray->SetValue( "jumps", 4 );
   myArray->SetValue( "over", 5 );
   myArray->SetValue( "the", 6 );
   myArray->SetValue( "lazy", 7 );
   myArray->SetValue( "dog", 8 );
   myArray->SetValue( "in", 9 );
   myArray->SetValue( "the", 10 );
   myArray->SetValue( "barn", 11 );

   // Displays the values of the Array.
   Console::WriteLine(  "The Array instance contains the following values:" );
   PrintIndexAndValues( myArray );

   // Searches for the last occurrence of the duplicated value.
   String^ myString =  "the";
   int myIndex = Array::LastIndexOf( myArray, myString );
   Console::WriteLine(  "The last occurrence of \"{0}\" is at index {1}.", myString, myIndex );

   // Searches for the last occurrence of the duplicated value in the first section of the Array.
   myIndex = Array::LastIndexOf( myArray, myString, 8 );
   Console::WriteLine(  "The last occurrence of \"{0}\" between the start and index 8 is at index {1}.", myString, myIndex );

   // Searches for the last occurrence of the duplicated value in a section of the Array.  
   // Note that the start index is greater than the end index because the search is done backward.
   myIndex = Array::LastIndexOf( myArray, myString, 10, 6 );
   Console::WriteLine(  "The last occurrence of \"{0}\" between index 5 and index 10 is at index {1}.", myString, myIndex );
}

void PrintIndexAndValues( Array^ myArray )
{
   for ( int i = myArray->GetLowerBound( 0 ); i <= myArray->GetUpperBound( 0 ); i++ )
      Console::WriteLine(  "\t[{0}]:\t{1}", i, myArray->GetValue( i ) );
}

/* 
 This code produces the following output.
 
 The Array instance contains the following values:
     [0]:    the
     [1]:    quick
     [2]:    brown
     [3]:    fox
     [4]:    jumps
     [5]:    over
     [6]:    the
     [7]:    lazy
     [8]:    dog
     [9]:    in
     [10]:    the
     [11]:    barn
 The last occurrence of "the" is at index 10.
 The last occurrence of "the" between the start and index 8 is at index 6.
 The last occurrence of "the" between index 5 and index 10 is at index 10.
 */

let printIndexAndValues (arr: 'a []) =
   for i = arr.GetLowerBound 0 to arr.GetUpperBound 0 do
      printfn $"\t[{i}]:\t{arr[i]}"

// Creates and initializes a new Array with three elements of the same value.
let myArray = 
   [| "the"; "quick"; "brown"; "fox"
      "jumps"; "over"; "the"; "lazy"
      "dog"; "in"; "the"; "barn" |]

// Displays the values of the Array.
printfn "The Array contains the following values:"
printIndexAndValues myArray

// Searches for the last occurrence of the duplicated value.
let myString = "the"
let myIndex = Array.LastIndexOf(myArray, myString)
printfn $"The last occurrence of \"{myString}\" is at index {myIndex}."

// Searches for the last occurrence of the duplicated value in the first section of the Array.
let myIndex = Array.LastIndexOf(myArray, myString, 8)
printfn $"The last occurrence of \"{myString}\" between the start and index 8 is at index {myIndex}."

// Searches for the last occurrence of the duplicated value in a section of the Array.
// Note that the start index is greater than the end index because the search is done backward.
let myIndex = Array.LastIndexOf( myArray, myString, 10, 6 )
printfn $"The last occurrence of \"{myString}\" between index 5 and index 10 is at index {myIndex}."


//      This code produces the following output.
//
//      The Array contains the following values:
//         [0]:    the
//         [1]:    quick
//         [2]:    brown
//         [3]:    fox
//         [4]:    jumps
//         [5]:    over
//         [6]:    the
//         [7]:    lazy
//         [8]:    dog
//         [9]:    in
//         [10]:    the
//         [11]:    barn
//      The last occurrence of "the" is at index 10.
//      The last occurrence of "the" between the start and index 8 is at index 6.
//      The last occurrence of "the" between index 5 and index 10 is at index 10.

// Creates and initializes a new Array with three elements of the same value.
Array myArray=Array.CreateInstance( typeof(string), 12 );
myArray.SetValue( "the", 0 );
myArray.SetValue( "quick", 1 );
myArray.SetValue( "brown", 2 );
myArray.SetValue( "fox", 3 );
myArray.SetValue( "jumps", 4 );
myArray.SetValue( "over", 5 );
myArray.SetValue( "the", 6 );
myArray.SetValue( "lazy", 7 );
myArray.SetValue( "dog", 8 );
myArray.SetValue( "in", 9 );
myArray.SetValue( "the", 10 );
myArray.SetValue( "barn", 11 );

// Displays the values of the Array.
Console.WriteLine( "The Array contains the following values:" );
PrintIndexAndValues( myArray );

// Searches for the last occurrence of the duplicated value.
string myString = "the";
int myIndex = Array.LastIndexOf( myArray, myString );
Console.WriteLine( "The last occurrence of \"{0}\" is at index {1}.", myString, myIndex );

// Searches for the last occurrence of the duplicated value in the first section of the Array.
myIndex = Array.LastIndexOf( myArray, myString, 8 );
Console.WriteLine( "The last occurrence of \"{0}\" between the start and index 8 is at index {1}.", myString, myIndex );

// Searches for the last occurrence of the duplicated value in a section of the Array.
// Note that the start index is greater than the end index because the search is done backward.
myIndex = Array.LastIndexOf( myArray, myString, 10, 6 );
Console.WriteLine( "The last occurrence of \"{0}\" between index 5 and index 10 is at index {1}.", myString, myIndex );

void PrintIndexAndValues( Array anArray )  {
   for ( int i = anArray.GetLowerBound(0); i <= anArray.GetUpperBound(0); i++ )
      Console.WriteLine( "\t[{0}]:\t{1}", i, anArray.GetValue( i ) );
}

/*
This code produces the following output.

The Array contains the following values:
   [0]:    the
   [1]:    quick
   [2]:    brown
   [3]:    fox
   [4]:    jumps
   [5]:    over
   [6]:    the
   [7]:    lazy
   [8]:    dog
   [9]:    in
   [10]:    the
   [11]:    barn
The last occurrence of "the" is at index 10.
The last occurrence of "the" between the start and index 8 is at index 6.
The last occurrence of "the" between index 5 and index 10 is at index 10.
*/

Public Class SamplesArray    
    
    Public Shared Sub Main()
        
        ' Creates and initializes a new Array with three elements of
        ' the same value.
        Dim myArray As Array = Array.CreateInstance(GetType(String), 12)
        myArray.SetValue("the", 0)
        myArray.SetValue("quick", 1)
        myArray.SetValue("brown", 2)
        myArray.SetValue("fox", 3)
        myArray.SetValue("jumps", 4)
        myArray.SetValue("over", 5)
        myArray.SetValue("the", 6)
        myArray.SetValue("lazy", 7)
        myArray.SetValue("dog", 8)
        myArray.SetValue("in", 9)
        myArray.SetValue("the", 10)
        myArray.SetValue("barn", 11)
        
        ' Displays the values of the Array.
        Console.WriteLine("The Array contains the following values:")
        PrintIndexAndValues(myArray)
        
        ' Searches for the last occurrence of the duplicated value.
        Dim myString As String = "the"
        Dim myIndex As Integer = Array.LastIndexOf(myArray, myString)
        Console.WriteLine("The last occurrence of ""{0}"" is at index {1}.", _
           myString, myIndex)
        
        ' Searches for the last occurrence of the duplicated value in the first
        ' section of the Array.
        myIndex = Array.LastIndexOf(myArray, myString, 8)
        Console.WriteLine("The last occurrence of ""{0}"" between the start " _
           + "and index 8 is at index {1}.", myString, myIndex)
        
        ' Searches for the last occurrence of the duplicated value in a section
        ' of the Array.  Note that the start index is greater than the end
        ' index because the search is done backward.
        myIndex = Array.LastIndexOf(myArray, myString, 10, 6)
        Console.WriteLine("The last occurrence of ""{0}"" between index 5 " _
           + "and index 10 is at index {1}.", myString, myIndex)
    End Sub
    
    
    Public Shared Sub PrintIndexAndValues(myArray As Array)
        Dim i As Integer
        For i = myArray.GetLowerBound(0) To myArray.GetUpperBound(0)
            Console.WriteLine(ControlChars.Tab + "[{0}]:" + ControlChars.Tab _
               + "{1}", i, myArray.GetValue(i))
        Next i
    End Sub
End Class

' This code produces the following output.
' 
' The Array contains the following values:
'     [0]:    the
'     [1]:    quick
'     [2]:    brown
'     [3]:    fox
'     [4]:    jumps
'     [5]:    over
'     [6]:    the
'     [7]:    lazy
'     [8]:    dog
'     [9]:    in
'     [10]:    the
'     [11]:    barn
' The last occurrence of "the" is at index 10.
' The last occurrence of "the" between the start and index 8 is at index 6.
' The last occurrence of "the" between index 5 and index 10 is at index 10.

備註

如果 count 大於0，則從 startIndex 開始搜尋一維 Array，並結束於 startIndex 減 count 加1。

專案會使用 Object.Equals 方法，與指定的值進行比較。如果專案類型是非內建型別（使用者定義）型別，則會使用該類型的Equals 實作。

這個方法是 O（n）作業，其中 ncount。

另請參閱

IndexOf
在陣列中執行 Culture-Insensitive 字串作業

適用於

LastIndexOf<T>(T[], T)

來源:: Array.cs

來源:: Array.cs

來源:: Array.cs

搜尋指定的物件，並傳回整個 Array中最後一個出現的索引。

public:
generic <typename T>
 static int LastIndexOf(cli::array <T> ^ array, T value);

public static int LastIndexOf<T> (T[] array, T value);

static member LastIndexOf : 'T[] * 'T -> int

Public Shared Function LastIndexOf(Of T) (array As T(), value As T) As Integer

類型參數

T

陣列專案的型別。

參數

array: T[]

要搜尋的一維、以零起始 Array。

value: T

在 array中尋找的物件。

傳回

Int32

如果找到，則為整個 array中最後一個出現 value 之以零起始的索引;否則為 -1。

例外狀況

ArgumentNullException

array null。

範例

下列程式代碼範例示範 LastIndexOf 方法的所有三個泛型多載。系統會建立字串數位，其中一個專案會出現兩次，位於索引位置0和索引位置5。 LastIndexOf<T>(T[], T) 方法多載會從結尾搜尋整個陣列，並尋找字串的第二個出現專案。 LastIndexOf<T>(T[], T, Int32) 方法多載可用來從索引位置 3 往後搜尋陣列，並繼續到數位的開頭，並尋找字串的第一個出現專案。最後，LastIndexOf<T>(T[], T, Int32, Int32) 方法多載可用來搜尋四個專案的範圍，從索引位置 4 開始，向後延伸（也就是說，它會在位置 4、3、2 和 1 搜尋專案）：此搜尋會傳回 -1，因為該範圍內沒有搜尋字串的實例。

using namespace System;

void main()
{
    array<String^>^ dinosaurs = { "Tyrannosaurus", 
        "Amargasaurus",
        "Mamenchisaurus",
        "Brachiosaurus",
        "Deinonychus",
        "Tyrannosaurus",
        "Compsognathus" };

    Console::WriteLine();
    for each(String^ dinosaur in dinosaurs )
    {
        Console::WriteLine(dinosaur);
    }

    Console::WriteLine(
        "\nArray.LastIndexOf(dinosaurs, \"Tyrannosaurus\"): {0}", 
        Array::LastIndexOf(dinosaurs, "Tyrannosaurus"));

    Console::WriteLine(
        "\nArray.LastIndexOf(dinosaurs, \"Tyrannosaurus\", 3): {0}", 
        Array::LastIndexOf(dinosaurs, "Tyrannosaurus", 3));

    Console::WriteLine(
        "\nArray.LastIndexOf(dinosaurs, \"Tyrannosaurus\", 4, 4): {0}", 
        Array::LastIndexOf(dinosaurs, "Tyrannosaurus", 4, 4));
}

/* This code example produces the following output:

Tyrannosaurus
Amargasaurus
Mamenchisaurus
Brachiosaurus
Deinonychus
Tyrannosaurus
Compsognathus

Array.LastIndexOf(dinosaurs, "Tyrannosaurus"): 5

Array.LastIndexOf(dinosaurs, "Tyrannosaurus", 3): 0

Array.LastIndexOf(dinosaurs, "Tyrannosaurus", 4, 4): -1
 */

string[] dinosaurs = { "Tyrannosaurus",
    "Amargasaurus",
    "Mamenchisaurus",
    "Brachiosaurus",
    "Deinonychus",
    "Tyrannosaurus",
    "Compsognathus" };

Console.WriteLine();
foreach(string dinosaur in dinosaurs)
{
    Console.WriteLine(dinosaur);
}

Console.WriteLine(
    "\nArray.LastIndexOf(dinosaurs, \"Tyrannosaurus\"): {0}",
    Array.LastIndexOf(dinosaurs, "Tyrannosaurus"));

Console.WriteLine(
    "\nArray.LastIndexOf(dinosaurs, \"Tyrannosaurus\", 3): {0}",
    Array.LastIndexOf(dinosaurs, "Tyrannosaurus", 3));

Console.WriteLine(
    "\nArray.LastIndexOf(dinosaurs, \"Tyrannosaurus\", 4, 4): {0}",
    Array.LastIndexOf(dinosaurs, "Tyrannosaurus", 4, 4));

/* This code example produces the following output:

Tyrannosaurus
Amargasaurus
Mamenchisaurus
Brachiosaurus
Deinonychus
Tyrannosaurus
Compsognathus

Array.LastIndexOf(dinosaurs, "Tyrannosaurus"): 5

Array.LastIndexOf(dinosaurs, "Tyrannosaurus", 3): 0

Array.LastIndexOf(dinosaurs, "Tyrannosaurus", 4, 4): -1
*/

open System

let dinosaurs = 
    [| "Tyrannosaurus"
       "Amargasaurus"
       "Mamenchisaurus"
       "Brachiosaurus"
       "Deinonychus"
       "Tyrannosaurus"
       "Compsognathus" |]

printfn ""
for dino in dinosaurs do
    printfn $"{dino}"

Array.LastIndexOf(dinosaurs, "Tyrannosaurus")
|> printfn "\nArray.LastIndexOf(dinosaurs, \"Tyrannosaurus\"): %i"

Array.LastIndexOf(dinosaurs, "Tyrannosaurus", 3)
|> printfn "\nArray.LastIndexOf(dinosaurs, \"Tyrannosaurus\", 3): %i"

Array.LastIndexOf(dinosaurs, "Tyrannosaurus", 4, 4)
|> printfn "\nArray.LastIndexOf(dinosaurs, \"Tyrannosaurus\", 4, 4): %i"

// This code example produces the following output:
//    
//    Tyrannosaurus
//    Amargasaurus
//    Mamenchisaurus
//    Brachiosaurus
//    Deinonychus
//    Tyrannosaurus
//    Compsognathus
//    
//    Array.LastIndexOf(dinosaurs, "Tyrannosaurus"): 5
//
//    Array.LastIndexOf(dinosaurs, "Tyrannosaurus", 3): 0
//
//    Array.LastIndexOf(dinosaurs, "Tyrannosaurus", 4, 4): -1

Public Class Example

    Public Shared Sub Main()

        Dim dinosaurs() As String = { "Tyrannosaurus", _
            "Amargasaurus", _
            "Mamenchisaurus", _
            "Brachiosaurus", _
            "Deinonychus", _
            "Tyrannosaurus", _
            "Compsognathus" }

        Console.WriteLine()
        For Each dinosaur As String In dinosaurs
            Console.WriteLine(dinosaur)
        Next

        Console.WriteLine(vbLf & _
            "Array.LastIndexOf(dinosaurs, ""Tyrannosaurus""): {0}", _
            Array.LastIndexOf(dinosaurs, "Tyrannosaurus"))

        Console.WriteLine(vbLf & _
            "Array.LastIndexOf(dinosaurs, ""Tyrannosaurus"", 3): {0}", _
            Array.LastIndexOf(dinosaurs, "Tyrannosaurus", 3))

        Console.WriteLine(vbLf & _
            "Array.LastIndexOf(dinosaurs, ""Tyrannosaurus"", 4, 4): {0}", _
            Array.LastIndexOf(dinosaurs, "Tyrannosaurus", 4, 4))

    End Sub
End Class

' This code example produces the following output:
'
'Tyrannosaurus
'Amargasaurus
'Mamenchisaurus
'Brachiosaurus
'Deinonychus
'Tyrannosaurus
'Compsognathus
'
'Array.LastIndexOf(dinosaurs, "Tyrannosaurus"): 5
'
'Array.LastIndexOf(dinosaurs, "Tyrannosaurus", 3): 0
'
'Array.LastIndexOf(dinosaurs, "Tyrannosaurus", 4, 4): -1

備註

從最後一個項目開始搜尋 Array，並在第一個項目結束。

專案會使用 Object.Equals 方法，與指定的值進行比較。如果專案類型是非內建型別（使用者定義）型別，則會使用該類型的 Equals 實作。

這個方法是 O（n）作業，其中 n 是 array的 Length。

另請參閱

IndexOf
在陣列中執行 Culture-Insensitive 字串作業

適用於

LastIndexOf<T>(T[], T, Int32)

來源:: Array.cs

來源:: Array.cs

來源:: Array.cs

搜尋指定的物件，並傳回從第一個元素延伸至指定索引之 Array 中最後一個出現專案的索引。

public:
generic <typename T>
 static int LastIndexOf(cli::array <T> ^ array, T value, int startIndex);

public static int LastIndexOf<T> (T[] array, T value, int startIndex);

static member LastIndexOf : 'T[] * 'T * int -> int

Public Shared Function LastIndexOf(Of T) (array As T(), value As T, startIndex As Integer) As Integer

類型參數

T

陣列專案的型別。

參數

array: T[]

要搜尋的一維、以零起始 Array。

value: T

在 array中尋找的物件。

startIndex: Int32

回溯搜尋之以零起始的起始索引。

傳回

Int32

在從第一個 array 元素延伸至 startIndex的元素範圍內，最後一次出現 value 的以零起始的索引，如果找到則為 ;否則為 -1。

例外狀況

ArgumentNullException

array null。

ArgumentOutOfRangeException

startIndex 超出 array的有效索引範圍。

範例

using namespace System;

void main()
{
    array<String^>^ dinosaurs = { "Tyrannosaurus", 
        "Amargasaurus",
        "Mamenchisaurus",
        "Brachiosaurus",
        "Deinonychus",
        "Tyrannosaurus",
        "Compsognathus" };

    Console::WriteLine();
    for each(String^ dinosaur in dinosaurs )
    {
        Console::WriteLine(dinosaur);
    }

    Console::WriteLine(
        "\nArray.LastIndexOf(dinosaurs, \"Tyrannosaurus\"): {0}", 
        Array::LastIndexOf(dinosaurs, "Tyrannosaurus"));

    Console::WriteLine(
        "\nArray.LastIndexOf(dinosaurs, \"Tyrannosaurus\", 3): {0}", 
        Array::LastIndexOf(dinosaurs, "Tyrannosaurus", 3));

    Console::WriteLine(
        "\nArray.LastIndexOf(dinosaurs, \"Tyrannosaurus\", 4, 4): {0}", 
        Array::LastIndexOf(dinosaurs, "Tyrannosaurus", 4, 4));
}

/* This code example produces the following output:

Tyrannosaurus
Amargasaurus
Mamenchisaurus
Brachiosaurus
Deinonychus
Tyrannosaurus
Compsognathus

Array.LastIndexOf(dinosaurs, "Tyrannosaurus"): 5

Array.LastIndexOf(dinosaurs, "Tyrannosaurus", 3): 0

Array.LastIndexOf(dinosaurs, "Tyrannosaurus", 4, 4): -1
 */

string[] dinosaurs = { "Tyrannosaurus",
    "Amargasaurus",
    "Mamenchisaurus",
    "Brachiosaurus",
    "Deinonychus",
    "Tyrannosaurus",
    "Compsognathus" };

Console.WriteLine();
foreach(string dinosaur in dinosaurs)
{
    Console.WriteLine(dinosaur);
}

Console.WriteLine(
    "\nArray.LastIndexOf(dinosaurs, \"Tyrannosaurus\"): {0}",
    Array.LastIndexOf(dinosaurs, "Tyrannosaurus"));

Console.WriteLine(
    "\nArray.LastIndexOf(dinosaurs, \"Tyrannosaurus\", 3): {0}",
    Array.LastIndexOf(dinosaurs, "Tyrannosaurus", 3));

Console.WriteLine(
    "\nArray.LastIndexOf(dinosaurs, \"Tyrannosaurus\", 4, 4): {0}",
    Array.LastIndexOf(dinosaurs, "Tyrannosaurus", 4, 4));

/* This code example produces the following output:

Tyrannosaurus
Amargasaurus
Mamenchisaurus
Brachiosaurus
Deinonychus
Tyrannosaurus
Compsognathus

Array.LastIndexOf(dinosaurs, "Tyrannosaurus"): 5

Array.LastIndexOf(dinosaurs, "Tyrannosaurus", 3): 0

Array.LastIndexOf(dinosaurs, "Tyrannosaurus", 4, 4): -1
*/

open System

let dinosaurs = 
    [| "Tyrannosaurus"
       "Amargasaurus"
       "Mamenchisaurus"
       "Brachiosaurus"
       "Deinonychus"
       "Tyrannosaurus"
       "Compsognathus" |]

printfn ""
for dino in dinosaurs do
    printfn $"{dino}"

Array.LastIndexOf(dinosaurs, "Tyrannosaurus")
|> printfn "\nArray.LastIndexOf(dinosaurs, \"Tyrannosaurus\"): %i"

Array.LastIndexOf(dinosaurs, "Tyrannosaurus", 3)
|> printfn "\nArray.LastIndexOf(dinosaurs, \"Tyrannosaurus\", 3): %i"

Array.LastIndexOf(dinosaurs, "Tyrannosaurus", 4, 4)
|> printfn "\nArray.LastIndexOf(dinosaurs, \"Tyrannosaurus\", 4, 4): %i"

// This code example produces the following output:
//    
//    Tyrannosaurus
//    Amargasaurus
//    Mamenchisaurus
//    Brachiosaurus
//    Deinonychus
//    Tyrannosaurus
//    Compsognathus
//    
//    Array.LastIndexOf(dinosaurs, "Tyrannosaurus"): 5
//
//    Array.LastIndexOf(dinosaurs, "Tyrannosaurus", 3): 0
//
//    Array.LastIndexOf(dinosaurs, "Tyrannosaurus", 4, 4): -1

Public Class Example

    Public Shared Sub Main()

        Dim dinosaurs() As String = { "Tyrannosaurus", _
            "Amargasaurus", _
            "Mamenchisaurus", _
            "Brachiosaurus", _
            "Deinonychus", _
            "Tyrannosaurus", _
            "Compsognathus" }

        Console.WriteLine()
        For Each dinosaur As String In dinosaurs
            Console.WriteLine(dinosaur)
        Next

        Console.WriteLine(vbLf & _
            "Array.LastIndexOf(dinosaurs, ""Tyrannosaurus""): {0}", _
            Array.LastIndexOf(dinosaurs, "Tyrannosaurus"))

        Console.WriteLine(vbLf & _
            "Array.LastIndexOf(dinosaurs, ""Tyrannosaurus"", 3): {0}", _
            Array.LastIndexOf(dinosaurs, "Tyrannosaurus", 3))

        Console.WriteLine(vbLf & _
            "Array.LastIndexOf(dinosaurs, ""Tyrannosaurus"", 4, 4): {0}", _
            Array.LastIndexOf(dinosaurs, "Tyrannosaurus", 4, 4))

    End Sub
End Class

' This code example produces the following output:
'
'Tyrannosaurus
'Amargasaurus
'Mamenchisaurus
'Brachiosaurus
'Deinonychus
'Tyrannosaurus
'Compsognathus
'
'Array.LastIndexOf(dinosaurs, "Tyrannosaurus"): 5
'
'Array.LastIndexOf(dinosaurs, "Tyrannosaurus", 3): 0
'
'Array.LastIndexOf(dinosaurs, "Tyrannosaurus", 4, 4): -1

備註

從 startIndex 開始搜尋 Array，並結束於第一個專案。

專案會使用 Object.Equals 方法，與指定的值進行比較。如果專案類型是非內建型別（使用者定義）型別，則會使用該類型的 Equals 實作。

此方法是 O（n）作業，其中 n 是從 array 開頭到 startIndex的項目數目。

另請參閱

IndexOf
在陣列中執行 Culture-Insensitive 字串作業

適用於

LastIndexOf<T>(T[], T, Int32, Int32)

來源:: Array.cs

來源:: Array.cs

來源:: Array.cs

搜尋指定的物件，並傳回在包含指定項目數目且結束於指定索引之 Array 中最後一個出現專案的索引。

public:
generic <typename T>
 static int LastIndexOf(cli::array <T> ^ array, T value, int startIndex, int count);

public static int LastIndexOf<T> (T[] array, T value, int startIndex, int count);

static member LastIndexOf : 'T[] * 'T * int * int -> int

Public Shared Function LastIndexOf(Of T) (array As T(), value As T, startIndex As Integer, count As Integer) As Integer

類型參數

T

陣列專案的型別。

參數

array: T[]

要搜尋的一維、以零起始 Array。

value: T

在 array中尋找的物件。

startIndex: Int32

回溯搜尋之以零起始的起始索引。

count: Int32

要搜尋之區段中的項目數目。

傳回

Int32

array 中最後一次出現 value 的以零起始的索引，其中包含 count 中指定的項目數目，並在找到時結束於 startIndex;否則為 -1。

例外狀況

ArgumentNullException

array null。

ArgumentOutOfRangeException

startIndex 超出 array的有效索引範圍。

-或-

count 小於零。

-或-

startIndex 和 count 未在 array中指定有效的區段。

範例

using namespace System;

void main()
{
    array<String^>^ dinosaurs = { "Tyrannosaurus", 
        "Amargasaurus",
        "Mamenchisaurus",
        "Brachiosaurus",
        "Deinonychus",
        "Tyrannosaurus",
        "Compsognathus" };

    Console::WriteLine();
    for each(String^ dinosaur in dinosaurs )
    {
        Console::WriteLine(dinosaur);
    }

    Console::WriteLine(
        "\nArray.LastIndexOf(dinosaurs, \"Tyrannosaurus\"): {0}", 
        Array::LastIndexOf(dinosaurs, "Tyrannosaurus"));

    Console::WriteLine(
        "\nArray.LastIndexOf(dinosaurs, \"Tyrannosaurus\", 3): {0}", 
        Array::LastIndexOf(dinosaurs, "Tyrannosaurus", 3));

    Console::WriteLine(
        "\nArray.LastIndexOf(dinosaurs, \"Tyrannosaurus\", 4, 4): {0}", 
        Array::LastIndexOf(dinosaurs, "Tyrannosaurus", 4, 4));
}

/* This code example produces the following output:

Tyrannosaurus
Amargasaurus
Mamenchisaurus
Brachiosaurus
Deinonychus
Tyrannosaurus
Compsognathus

Array.LastIndexOf(dinosaurs, "Tyrannosaurus"): 5

Array.LastIndexOf(dinosaurs, "Tyrannosaurus", 3): 0

Array.LastIndexOf(dinosaurs, "Tyrannosaurus", 4, 4): -1
 */

string[] dinosaurs = { "Tyrannosaurus",
    "Amargasaurus",
    "Mamenchisaurus",
    "Brachiosaurus",
    "Deinonychus",
    "Tyrannosaurus",
    "Compsognathus" };

Console.WriteLine();
foreach(string dinosaur in dinosaurs)
{
    Console.WriteLine(dinosaur);
}

Console.WriteLine(
    "\nArray.LastIndexOf(dinosaurs, \"Tyrannosaurus\"): {0}",
    Array.LastIndexOf(dinosaurs, "Tyrannosaurus"));

Console.WriteLine(
    "\nArray.LastIndexOf(dinosaurs, \"Tyrannosaurus\", 3): {0}",
    Array.LastIndexOf(dinosaurs, "Tyrannosaurus", 3));

Console.WriteLine(
    "\nArray.LastIndexOf(dinosaurs, \"Tyrannosaurus\", 4, 4): {0}",
    Array.LastIndexOf(dinosaurs, "Tyrannosaurus", 4, 4));

/* This code example produces the following output:

Tyrannosaurus
Amargasaurus
Mamenchisaurus
Brachiosaurus
Deinonychus
Tyrannosaurus
Compsognathus

Array.LastIndexOf(dinosaurs, "Tyrannosaurus"): 5

Array.LastIndexOf(dinosaurs, "Tyrannosaurus", 3): 0

Array.LastIndexOf(dinosaurs, "Tyrannosaurus", 4, 4): -1
*/

open System

let dinosaurs = 
    [| "Tyrannosaurus"
       "Amargasaurus"
       "Mamenchisaurus"
       "Brachiosaurus"
       "Deinonychus"
       "Tyrannosaurus"
       "Compsognathus" |]

printfn ""
for dino in dinosaurs do
    printfn $"{dino}"

Array.LastIndexOf(dinosaurs, "Tyrannosaurus")
|> printfn "\nArray.LastIndexOf(dinosaurs, \"Tyrannosaurus\"): %i"

Array.LastIndexOf(dinosaurs, "Tyrannosaurus", 3)
|> printfn "\nArray.LastIndexOf(dinosaurs, \"Tyrannosaurus\", 3): %i"

Array.LastIndexOf(dinosaurs, "Tyrannosaurus", 4, 4)
|> printfn "\nArray.LastIndexOf(dinosaurs, \"Tyrannosaurus\", 4, 4): %i"

// This code example produces the following output:
//    
//    Tyrannosaurus
//    Amargasaurus
//    Mamenchisaurus
//    Brachiosaurus
//    Deinonychus
//    Tyrannosaurus
//    Compsognathus
//    
//    Array.LastIndexOf(dinosaurs, "Tyrannosaurus"): 5
//
//    Array.LastIndexOf(dinosaurs, "Tyrannosaurus", 3): 0
//
//    Array.LastIndexOf(dinosaurs, "Tyrannosaurus", 4, 4): -1

Public Class Example

    Public Shared Sub Main()

        Dim dinosaurs() As String = { "Tyrannosaurus", _
            "Amargasaurus", _
            "Mamenchisaurus", _
            "Brachiosaurus", _
            "Deinonychus", _
            "Tyrannosaurus", _
            "Compsognathus" }

        Console.WriteLine()
        For Each dinosaur As String In dinosaurs
            Console.WriteLine(dinosaur)
        Next

        Console.WriteLine(vbLf & _
            "Array.LastIndexOf(dinosaurs, ""Tyrannosaurus""): {0}", _
            Array.LastIndexOf(dinosaurs, "Tyrannosaurus"))

        Console.WriteLine(vbLf & _
            "Array.LastIndexOf(dinosaurs, ""Tyrannosaurus"", 3): {0}", _
            Array.LastIndexOf(dinosaurs, "Tyrannosaurus", 3))

        Console.WriteLine(vbLf & _
            "Array.LastIndexOf(dinosaurs, ""Tyrannosaurus"", 4, 4): {0}", _
            Array.LastIndexOf(dinosaurs, "Tyrannosaurus", 4, 4))

    End Sub
End Class

' This code example produces the following output:
'
'Tyrannosaurus
'Amargasaurus
'Mamenchisaurus
'Brachiosaurus
'Deinonychus
'Tyrannosaurus
'Compsognathus
'
'Array.LastIndexOf(dinosaurs, "Tyrannosaurus"): 5
'
'Array.LastIndexOf(dinosaurs, "Tyrannosaurus", 3): 0
'
'Array.LastIndexOf(dinosaurs, "Tyrannosaurus", 4, 4): -1

備註

如果 count 大於0，則會從 startIndex 開始搜尋 Array，並結束於 startIndex 減 count 加1。

專案會使用 Object.Equals 方法，與指定的值進行比較。如果專案類型是非內建型別（使用者定義）型別，則會使用該類型的 Equals 實作。

這個方法是 O（n）作業，其中 ncount。

另請參閱

IndexOf
在陣列中執行 Culture-Insensitive 字串作業

適用於

共用方式為

Array.LastIndexOf 方法

定義

多載

LastIndexOf(Array, Object)

參數

傳回

例外狀況

範例

備註

另請參閱

適用於

LastIndexOf(Array, Object, Int32)

參數

傳回

例外狀況

範例

備註

另請參閱

適用於

LastIndexOf(Array, Object, Int32, Int32)

參數

傳回

例外狀況

範例

備註

另請參閱

適用於

LastIndexOf<T>(T[], T)

類型參數

參數

傳回

例外狀況

範例

備註

另請參閱

適用於

LastIndexOf<T>(T[], T, Int32)

類型參數

參數

傳回

例外狀況

範例

備註

另請參閱

適用於

LastIndexOf<T>(T[], T, Int32, Int32)

類型參數

參數

傳回

例外狀況

範例

備註

另請參閱

適用於

其他資源