List<T>.CopyTo Method

Definition

List<T> 或其中一部分複製到陣列。Copies the List<T> or a portion of it to an array.

Overloads

CopyTo(T[], Int32)

從目標陣列的指定索引處開始,將整個 List<T> 複製到相容的一維陣列中。Copies the entire List<T> to a compatible one-dimensional array, starting at the specified index of the target array.

CopyTo(Int32, T[], Int32, Int32)

從目標陣列的指定索引處開始,將項目範圍從 List<T> 複製到相容的一維陣列。Copies a range of elements from the List<T> to a compatible one-dimensional array, starting at the specified index of the target array.

CopyTo(T[])

從目標陣列的開頭開始,將整個 List<T> 複製到相容的一維陣列。Copies the entire List<T> to a compatible one-dimensional array, starting at the beginning of the target array.

CopyTo(T[], Int32)

從目標陣列的指定索引處開始,將整個 List<T> 複製到相容的一維陣列中。Copies the entire List<T> to a compatible one-dimensional array, starting at the specified index of the target array.

public:
 virtual void CopyTo(cli::array <T> ^ array, int arrayIndex);
public void CopyTo (T[] array, int arrayIndex);
abstract member CopyTo : 'T[] * int -> unit
override this.CopyTo : 'T[] * int -> unit
Public Sub CopyTo (array As T(), arrayIndex As Integer)

Parameters

array
T[]

一維 Array,此陣列是從 List<T> 複製之元素的目的地。The one-dimensional Array that is the destination of the elements copied from List<T>. Array 必須有以零為基底的索引。The Array must have zero-based indexing.

arrayIndex
Int32

array 中以零為基底的索引,這是複製開始之處。The zero-based index in array at which copying begins.

Implements

Exceptions

arraynullarray is null.

arrayIndex 小於 0。arrayIndex is less than 0.

來源 List<T> 中的項目數目,大於 arrayIndex 到目的 array 結尾的可用空間。The number of elements in the source List<T> is greater than the available space from arrayIndex to the end of the destination array.

Examples

下列範例示範 CopyTo 方法的所有三個多載。The following example demonstrates all three overloads of the CopyTo method. 會建立字串的 List<T>,並以5個字串填入。A List<T> of strings is created and populated with 5 strings. 系統會建立15個元素的空字串陣列,並使用 CopyTo(T[]) 的方法多載,將清單的所有元素複製到從陣列的第一個元素開始的陣列。An empty string array of 15 elements is created, and the CopyTo(T[]) method overload is used to copy all the elements of the list to the array beginning at the first element of the array. CopyTo(T[], Int32) 方法多載是用來將清單的所有元素複製到陣列索引6開頭的陣列(索引5保留空白)。The CopyTo(T[], Int32) method overload is used to copy all the elements of the list to the array beginning at array index 6 (leaving index 5 empty). 最後,CopyTo(Int32, T[], Int32, Int32) 方法多載是用來從清單中的3個元素(從索引2開始)複製到從陣列索引12開始的陣列(索引11留空)。Finally, the CopyTo(Int32, T[], Int32, Int32) method overload is used to copy 3 elements from the list, beginning with index 2, to the array beginning at array index 12 (leaving index 11 empty). 接著會顯示陣列的內容。The contents of the array are then displayed.

using namespace System;
using namespace System::Collections::Generic;

void main()
{
    List<String^>^ dinosaurs = gcnew List<String^>();

    dinosaurs->Add("Tyrannosaurus");
    dinosaurs->Add("Amargasaurus");
    dinosaurs->Add("Mamenchisaurus");
    dinosaurs->Add("Brachiosaurus");
    dinosaurs->Add("Compsognathus");

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

    // Create an array of 15 strings.
    array<String^>^ arr = gcnew array<String^>(15);

    dinosaurs->CopyTo(arr);
    dinosaurs->CopyTo(arr, 6);
    dinosaurs->CopyTo(2, arr, 12, 3);

    Console::WriteLine("\nContents of the array:");
    for each(String^ dinosaurs in arr )
    {
        Console::WriteLine(dinosaurs);
    }
}

/* This code example produces the following output:

Tyrannosaurus
Amargasaurus
Mamenchisaurus
Brachiosaurus
Deinonychus
Tyrannosaurus
Compsognathus

IndexOf("Tyrannosaurus"): 0

IndexOf("Tyrannosaurus", 3): 5

IndexOf("Tyrannosaurus", 2, 2): -1
 */
using System;
using System.Collections.Generic;

public class Example
{
    public static void Main()
    {
        List<string> dinosaurs = new List<string>();

        dinosaurs.Add("Tyrannosaurus");
        dinosaurs.Add("Amargasaurus");
        dinosaurs.Add("Mamenchisaurus");
        dinosaurs.Add("Brachiosaurus");
        dinosaurs.Add("Compsognathus");

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

        // Declare an array with 15 elements.
        string[] array = new string[15];

        dinosaurs.CopyTo(array);
        dinosaurs.CopyTo(array, 6);
        dinosaurs.CopyTo(2, array, 12, 3);

        Console.WriteLine("\nContents of the array:");
        foreach(string dinosaur in array)
        {
            Console.WriteLine(dinosaur);
        }
    }
}

/* This code example produces the following output:

Tyrannosaurus
Amargasaurus
Mamenchisaurus
Brachiosaurus
Compsognathus

Contents of the array:
Tyrannosaurus
Amargasaurus
Mamenchisaurus
Brachiosaurus
Compsognathus

Tyrannosaurus
Amargasaurus
Mamenchisaurus
Brachiosaurus
Compsognathus

Mamenchisaurus
Brachiosaurus
Compsognathus
 */
Imports System.Collections.Generic

Public Class Example

    Public Shared Sub Main()

        Dim dinosaurs As New List(Of String)

        dinosaurs.Add("Tyrannosaurus")
        dinosaurs.Add("Amargasaurus")
        dinosaurs.Add("Mamenchisaurus")
        dinosaurs.Add("Brachiosaurus")
        dinosaurs.Add("Compsognathus")

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

        ' Declare an array with 15 elements (0 through 14).
        Dim array(14) As String

        dinosaurs.CopyTo(array)
        dinosaurs.CopyTo(array, 6)
        dinosaurs.CopyTo(2, array, 12, 3)

        Console.WriteLine(vbLf & "Contents of the array:")
        For Each dinosaur As String In array
            Console.WriteLine(dinosaur)
        Next

    End Sub
End Class

' This code example produces the following output:
'
'Tyrannosaurus
'Amargasaurus
'Mamenchisaurus
'Brachiosaurus
'Compsognathus
'
'Contents of the array:
'Tyrannosaurus
'Amargasaurus
'Mamenchisaurus
'Brachiosaurus
'Compsognathus
'
'Tyrannosaurus
'Amargasaurus
'Mamenchisaurus
'Brachiosaurus
'Compsognathus
'
'Mamenchisaurus
'Brachiosaurus
'Compsognathus

Remarks

這個方法會使用 Array.Copy 來複製元素。This method uses Array.Copy to copy the elements.

元素會以列舉值逐一查看 List<T>的相同順序複製到 ArrayThe elements are copied to the Array in the same order in which the enumerator iterates through the List<T>.

這個方法是 O (n)運算,其中nCountThis method is an O(n) operation, where n is Count.

CopyTo(Int32, T[], Int32, Int32)

從目標陣列的指定索引處開始,將項目範圍從 List<T> 複製到相容的一維陣列。Copies a range of elements from the List<T> to a compatible one-dimensional array, starting at the specified index of the target array.

public:
 void CopyTo(int index, cli::array <T> ^ array, int arrayIndex, int count);
public void CopyTo (int index, T[] array, int arrayIndex, int count);
member this.CopyTo : int * 'T[] * int * int -> unit
Public Sub CopyTo (index As Integer, array As T(), arrayIndex As Integer, count As Integer)

Parameters

index
Int32

來源 List<T> 中以零為起始的索引,位於複製開始的位置。The zero-based index in the source List<T> at which copying begins.

array
T[]

一維 Array,此陣列是從 List<T> 複製之元素的目的地。The one-dimensional Array that is the destination of the elements copied from List<T>. Array 必須有以零為基底的索引。The Array must have zero-based indexing.

arrayIndex
Int32

array 中以零為基底的索引,這是複製開始之處。The zero-based index in array at which copying begins.

count
Int32

要複製的項目數目。The number of elements to copy.

Exceptions

arraynullarray is null.

index 小於 0。index is less than 0.

-或--or- arrayIndex 小於 0。arrayIndex is less than 0.

-或--or- count 小於 0。count is less than 0.

index 等於或大於來源 List<T>Countindex is equal to or greater than the Count of the source List<T>.

-或--or- index 到來源 List<T> 結尾的項目數目,大於從 arrayIndex 到目的 array 結尾的可用空間。The number of elements from index to the end of the source List<T> is greater than the available space from arrayIndex to the end of the destination array.

Examples

下列範例示範 CopyTo 方法的所有三個多載。The following example demonstrates all three overloads of the CopyTo method. 會建立字串的 List<T>,並以5個字串填入。A List<T> of strings is created and populated with 5 strings. 系統會建立15個元素的空字串陣列,並使用 CopyTo(T[]) 的方法多載,將清單的所有元素複製到從陣列的第一個元素開始的陣列。An empty string array of 15 elements is created, and the CopyTo(T[]) method overload is used to copy all the elements of the list to the array beginning at the first element of the array. CopyTo(T[], Int32) 方法多載是用來將清單的所有元素複製到陣列索引6開頭的陣列(索引5保留空白)。The CopyTo(T[], Int32) method overload is used to copy all the elements of the list to the array beginning at array index 6 (leaving index 5 empty). 最後,CopyTo(Int32, T[], Int32, Int32) 方法多載是用來從清單中的3個元素(從索引2開始)複製到從陣列索引12開始的陣列(索引11留空)。Finally, the CopyTo(Int32, T[], Int32, Int32) method overload is used to copy 3 elements from the list, beginning with index 2, to the array beginning at array index 12 (leaving index 11 empty). 接著會顯示陣列的內容。The contents of the array are then displayed.

using namespace System;
using namespace System::Collections::Generic;

void main()
{
    List<String^>^ dinosaurs = gcnew List<String^>();

    dinosaurs->Add("Tyrannosaurus");
    dinosaurs->Add("Amargasaurus");
    dinosaurs->Add("Mamenchisaurus");
    dinosaurs->Add("Brachiosaurus");
    dinosaurs->Add("Compsognathus");

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

    // Create an array of 15 strings.
    array<String^>^ arr = gcnew array<String^>(15);

    dinosaurs->CopyTo(arr);
    dinosaurs->CopyTo(arr, 6);
    dinosaurs->CopyTo(2, arr, 12, 3);

    Console::WriteLine("\nContents of the array:");
    for each(String^ dinosaurs in arr )
    {
        Console::WriteLine(dinosaurs);
    }
}

/* This code example produces the following output:

Tyrannosaurus
Amargasaurus
Mamenchisaurus
Brachiosaurus
Deinonychus
Tyrannosaurus
Compsognathus

IndexOf("Tyrannosaurus"): 0

IndexOf("Tyrannosaurus", 3): 5

IndexOf("Tyrannosaurus", 2, 2): -1
 */
using System;
using System.Collections.Generic;

public class Example
{
    public static void Main()
    {
        List<string> dinosaurs = new List<string>();

        dinosaurs.Add("Tyrannosaurus");
        dinosaurs.Add("Amargasaurus");
        dinosaurs.Add("Mamenchisaurus");
        dinosaurs.Add("Brachiosaurus");
        dinosaurs.Add("Compsognathus");

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

        // Declare an array with 15 elements.
        string[] array = new string[15];

        dinosaurs.CopyTo(array);
        dinosaurs.CopyTo(array, 6);
        dinosaurs.CopyTo(2, array, 12, 3);

        Console.WriteLine("\nContents of the array:");
        foreach(string dinosaur in array)
        {
            Console.WriteLine(dinosaur);
        }
    }
}

/* This code example produces the following output:

Tyrannosaurus
Amargasaurus
Mamenchisaurus
Brachiosaurus
Compsognathus

Contents of the array:
Tyrannosaurus
Amargasaurus
Mamenchisaurus
Brachiosaurus
Compsognathus

Tyrannosaurus
Amargasaurus
Mamenchisaurus
Brachiosaurus
Compsognathus

Mamenchisaurus
Brachiosaurus
Compsognathus
 */
Imports System.Collections.Generic

Public Class Example

    Public Shared Sub Main()

        Dim dinosaurs As New List(Of String)

        dinosaurs.Add("Tyrannosaurus")
        dinosaurs.Add("Amargasaurus")
        dinosaurs.Add("Mamenchisaurus")
        dinosaurs.Add("Brachiosaurus")
        dinosaurs.Add("Compsognathus")

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

        ' Declare an array with 15 elements (0 through 14).
        Dim array(14) As String

        dinosaurs.CopyTo(array)
        dinosaurs.CopyTo(array, 6)
        dinosaurs.CopyTo(2, array, 12, 3)

        Console.WriteLine(vbLf & "Contents of the array:")
        For Each dinosaur As String In array
            Console.WriteLine(dinosaur)
        Next

    End Sub
End Class

' This code example produces the following output:
'
'Tyrannosaurus
'Amargasaurus
'Mamenchisaurus
'Brachiosaurus
'Compsognathus
'
'Contents of the array:
'Tyrannosaurus
'Amargasaurus
'Mamenchisaurus
'Brachiosaurus
'Compsognathus
'
'Tyrannosaurus
'Amargasaurus
'Mamenchisaurus
'Brachiosaurus
'Compsognathus
'
'Mamenchisaurus
'Brachiosaurus
'Compsognathus

Remarks

這個方法會使用 Array.Copy 來複製元素。This method uses Array.Copy to copy the elements.

元素會以列舉值逐一查看 List<T>的相同順序複製到 ArrayThe elements are copied to the Array in the same order in which the enumerator iterates through the List<T>.

這個方法是 O (n)運算,其中ncountThis method is an O(n) operation, where n is count.

CopyTo(T[])

從目標陣列的開頭開始,將整個 List<T> 複製到相容的一維陣列。Copies the entire List<T> to a compatible one-dimensional array, starting at the beginning of the target array.

public:
 void CopyTo(cli::array <T> ^ array);
public void CopyTo (T[] array);
member this.CopyTo : 'T[] -> unit
Public Sub CopyTo (array As T())

Parameters

array
T[]

一維 Array,此陣列是從 List<T> 複製之元素的目的地。The one-dimensional Array that is the destination of the elements copied from List<T>. Array 必須有以零為基底的索引。The Array must have zero-based indexing.

Exceptions

arraynullarray is null.

來源 List<T> 中的項目數大於目的 array 可包含的項目數。The number of elements in the source List<T> is greater than the number of elements that the destination array can contain.

Examples

下列範例示範 CopyTo 方法的所有三個多載。The following example demonstrates all three overloads of the CopyTo method. 會建立字串的 List<T>,並以5個字串填入。A List<T> of strings is created and populated with 5 strings. 系統會建立15個元素的空字串陣列,並使用 CopyTo(T[]) 的方法多載,將清單的所有元素複製到從陣列的第一個元素開始的陣列。An empty string array of 15 elements is created, and the CopyTo(T[]) method overload is used to copy all the elements of the list to the array beginning at the first element of the array. CopyTo(T[], Int32) 方法多載是用來將清單的所有元素複製到陣列索引6開頭的陣列(索引5保留空白)。The CopyTo(T[], Int32) method overload is used to copy all the elements of the list to the array beginning at array index 6 (leaving index 5 empty). 最後,CopyTo(Int32, T[], Int32, Int32) 方法多載是用來從清單中的3個元素(從索引2開始)複製到從陣列索引12開始的陣列(索引11留空)。Finally, the CopyTo(Int32, T[], Int32, Int32) method overload is used to copy 3 elements from the list, beginning with index 2, to the array beginning at array index 12 (leaving index 11 empty). 接著會顯示陣列的內容。The contents of the array are then displayed.

using namespace System;
using namespace System::Collections::Generic;

void main()
{
    List<String^>^ dinosaurs = gcnew List<String^>();

    dinosaurs->Add("Tyrannosaurus");
    dinosaurs->Add("Amargasaurus");
    dinosaurs->Add("Mamenchisaurus");
    dinosaurs->Add("Brachiosaurus");
    dinosaurs->Add("Compsognathus");

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

    // Create an array of 15 strings.
    array<String^>^ arr = gcnew array<String^>(15);

    dinosaurs->CopyTo(arr);
    dinosaurs->CopyTo(arr, 6);
    dinosaurs->CopyTo(2, arr, 12, 3);

    Console::WriteLine("\nContents of the array:");
    for each(String^ dinosaurs in arr )
    {
        Console::WriteLine(dinosaurs);
    }
}

/* This code example produces the following output:

Tyrannosaurus
Amargasaurus
Mamenchisaurus
Brachiosaurus
Deinonychus
Tyrannosaurus
Compsognathus

IndexOf("Tyrannosaurus"): 0

IndexOf("Tyrannosaurus", 3): 5

IndexOf("Tyrannosaurus", 2, 2): -1
 */
using System;
using System.Collections.Generic;

public class Example
{
    public static void Main()
    {
        List<string> dinosaurs = new List<string>();

        dinosaurs.Add("Tyrannosaurus");
        dinosaurs.Add("Amargasaurus");
        dinosaurs.Add("Mamenchisaurus");
        dinosaurs.Add("Brachiosaurus");
        dinosaurs.Add("Compsognathus");

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

        // Declare an array with 15 elements.
        string[] array = new string[15];

        dinosaurs.CopyTo(array);
        dinosaurs.CopyTo(array, 6);
        dinosaurs.CopyTo(2, array, 12, 3);

        Console.WriteLine("\nContents of the array:");
        foreach(string dinosaur in array)
        {
            Console.WriteLine(dinosaur);
        }
    }
}

/* This code example produces the following output:

Tyrannosaurus
Amargasaurus
Mamenchisaurus
Brachiosaurus
Compsognathus

Contents of the array:
Tyrannosaurus
Amargasaurus
Mamenchisaurus
Brachiosaurus
Compsognathus

Tyrannosaurus
Amargasaurus
Mamenchisaurus
Brachiosaurus
Compsognathus

Mamenchisaurus
Brachiosaurus
Compsognathus
 */
Imports System.Collections.Generic

Public Class Example

    Public Shared Sub Main()

        Dim dinosaurs As New List(Of String)

        dinosaurs.Add("Tyrannosaurus")
        dinosaurs.Add("Amargasaurus")
        dinosaurs.Add("Mamenchisaurus")
        dinosaurs.Add("Brachiosaurus")
        dinosaurs.Add("Compsognathus")

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

        ' Declare an array with 15 elements (0 through 14).
        Dim array(14) As String

        dinosaurs.CopyTo(array)
        dinosaurs.CopyTo(array, 6)
        dinosaurs.CopyTo(2, array, 12, 3)

        Console.WriteLine(vbLf & "Contents of the array:")
        For Each dinosaur As String In array
            Console.WriteLine(dinosaur)
        Next

    End Sub
End Class

' This code example produces the following output:
'
'Tyrannosaurus
'Amargasaurus
'Mamenchisaurus
'Brachiosaurus
'Compsognathus
'
'Contents of the array:
'Tyrannosaurus
'Amargasaurus
'Mamenchisaurus
'Brachiosaurus
'Compsognathus
'
'Tyrannosaurus
'Amargasaurus
'Mamenchisaurus
'Brachiosaurus
'Compsognathus
'
'Mamenchisaurus
'Brachiosaurus
'Compsognathus

Remarks

這個方法會使用 Array.Copy 來複製元素。This method uses Array.Copy to copy the elements.

元素會以列舉值逐一查看 List<T>的相同順序複製到 ArrayThe elements are copied to the Array in the same order in which the enumerator iterates through the List<T>.

這個方法是 O (n)運算,其中nCountThis method is an O(n) operation, where n is Count.

Applies to