通过

List<T>.AddRange(IEnumerable<T>) 方法

  • 参考

定义

命名空间:
System.Collections.Generic
程序集:
System.Collections.dll
程序集:
mscorlib.dll
程序集:
netstandard.dll
Source:
List.cs
Source:
List.cs
Source:
List.cs

将指定集合的元素添加到 List<T> 的末尾。

public:
 void AddRange(System::Collections::Generic::IEnumerable<T> ^ collection);
public void AddRange (System.Collections.Generic.IEnumerable<T> collection);
member this.AddRange : seq<'T> -> unit
Public Sub AddRange (collection As IEnumerable(Of T))

参数

collection
IEnumerable<T>

应将其元素添加到 List<T> 的末尾的集合。 集合自身不能为 null，但它可以包含为 null 的元素（如果类型 T 为引用类型）。

例外

ArgumentNullException

collection 为 null。

示例

以下示例演示 AddRange 了 对范围执行操作的 类的 List<T> 方法和各种其他方法。 创建字符串数组并将其传递给构造函数，用数组的元素填充列表。 调用 AddRange 方法时，列表作为其参数。 结果是将列表的当前元素添加到列表的末尾，从而复制所有元素。

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

void main()
{
    array<String^>^ input = { "Brachiosaurus", 
                              "Amargasaurus", 
                              "Mamenchisaurus" };

    List<String^>^ dinosaurs = 
        gcnew List<String^>((IEnumerable<String^>^) input);

    Console::WriteLine("\nCapacity: {0}", dinosaurs->Capacity);

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

    Console::WriteLine("\nAddRange(dinosaurs)");
    dinosaurs->AddRange(dinosaurs);

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

    Console::WriteLine("\nRemoveRange(2, 2)");
    dinosaurs->RemoveRange(2, 2);

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

    input = gcnew array<String^> { "Tyrannosaurus", 
                                   "Deinonychus", 
                                   "Velociraptor"};

    Console::WriteLine("\nInsertRange(3, (IEnumerable<String^>^) input)");
    dinosaurs->InsertRange(3, (IEnumerable<String^>^) input);

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

    Console::WriteLine("\noutput = dinosaurs->GetRange(2, 3)->ToArray()");
    array<String^>^ output = dinosaurs->GetRange(2, 3)->ToArray();
        
    Console::WriteLine();
    for each(String^ dinosaur in output )
    {
        Console::WriteLine(dinosaur);
    }
}

/* This code example produces the following output:

Capacity: 3

Brachiosaurus
Amargasaurus
Mamenchisaurus

AddRange(dinosaurs)

Brachiosaurus
Amargasaurus
Mamenchisaurus
Brachiosaurus
Amargasaurus
Mamenchisaurus

RemoveRange(2, 2)

Brachiosaurus
Amargasaurus
Amargasaurus
Mamenchisaurus

InsertRange(3, (IEnumerable<String^>^) input)

Brachiosaurus
Amargasaurus
Amargasaurus
Tyrannosaurus
Deinonychus
Velociraptor
Mamenchisaurus

output = dinosaurs->GetRange(2, 3)->ToArray()

Amargasaurus
Tyrannosaurus
Deinonychus
 */

using System;
using System.Collections.Generic;

public class Example
{
    public static void Main()
    {
        string[] input = { "Brachiosaurus",
                           "Amargasaurus",
                           "Mamenchisaurus" };

        List<string> dinosaurs = new List<string>(input);

        Console.WriteLine("\nCapacity: {0}", dinosaurs.Capacity);

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

        Console.WriteLine("\nAddRange(dinosaurs)");
        dinosaurs.AddRange(dinosaurs);

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

        Console.WriteLine("\nRemoveRange(2, 2)");
        dinosaurs.RemoveRange(2, 2);

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

        input = new string[] { "Tyrannosaurus",
                               "Deinonychus",
                               "Velociraptor"};

        Console.WriteLine("\nInsertRange(3, input)");
        dinosaurs.InsertRange(3, input);

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

        Console.WriteLine("\noutput = dinosaurs.GetRange(2, 3).ToArray()");
        string[] output = dinosaurs.GetRange(2, 3).ToArray();

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

/* This code example produces the following output:

Capacity: 3

Brachiosaurus
Amargasaurus
Mamenchisaurus

AddRange(dinosaurs)

Brachiosaurus
Amargasaurus
Mamenchisaurus
Brachiosaurus
Amargasaurus
Mamenchisaurus

RemoveRange(2, 2)

Brachiosaurus
Amargasaurus
Amargasaurus
Mamenchisaurus

InsertRange(3, input)

Brachiosaurus
Amargasaurus
Amargasaurus
Tyrannosaurus
Deinonychus
Velociraptor
Mamenchisaurus

output = dinosaurs.GetRange(2, 3).ToArray()

Amargasaurus
Tyrannosaurus
Deinonychus
 */

Imports System.Collections.Generic

Public Class Example

    Public Shared Sub Main()

        Dim input() As String = { "Brachiosaurus", _
                                  "Amargasaurus", _
                                  "Mamenchisaurus" }

        Dim dinosaurs As New List(Of String)(input)

        Console.WriteLine(vbLf & "Capacity: {0}", dinosaurs.Capacity)

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

        Console.WriteLine(vbLf & "AddRange(dinosaurs)")
        dinosaurs.AddRange(dinosaurs)

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

        Console.WriteLine(vbLf & "RemoveRange(2, 2)")
        dinosaurs.RemoveRange(2, 2)

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

        input = New String() { "Tyrannosaurus", _
                               "Deinonychus", _
                               "Velociraptor" }

        Console.WriteLine(vbLf & "InsertRange(3, input)")
        dinosaurs.InsertRange(3, input)

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

        Console.WriteLine(vbLf & "output = dinosaurs.GetRange(2, 3).ToArray")
        Dim output() As String = dinosaurs.GetRange(2, 3).ToArray()
        
        Console.WriteLine()
        For Each dinosaur As String In output
            Console.WriteLine(dinosaur)
        Next

    End Sub
End Class

' This code example produces the following output:
'
'Capacity: 3
'
'Brachiosaurus
'Amargasaurus
'Mamenchisaurus
'
'AddRange(dinosaurs)
'
'Brachiosaurus
'Amargasaurus
'Mamenchisaurus
'Brachiosaurus
'Amargasaurus
'Mamenchisaurus
'
'RemoveRange(2, 2)
'
'Brachiosaurus
'Amargasaurus
'Amargasaurus
'Mamenchisaurus
'
'InsertRange(3, input)
'
'Brachiosaurus
'Amargasaurus
'Amargasaurus
'Tyrannosaurus
'Deinonychus
'Velociraptor
'Mamenchisaurus
'
'output = dinosaurs.GetRange(2, 3).ToArray
'
'Amargasaurus
'Tyrannosaurus
'Deinonychus

注解

集合中元素的顺序保留在 中 List<T>。

如果新 Count (当前 Count 加上集合) 的大小将大于 Capacity，则 通过自动重新分配内部数组以适应新元素来增加 的容量 List<T> ，并在添加新元素之前将现有元素复制到新数组。

List<T>如果 可以在不增加 Capacity的情况下容纳新元素，则此方法是 O (n) 操作，其中 n 是要添加的元素数。 如果需要增加容量以适应新元素，此方法将变为 O (n + m) 运算，其中 n 是要添加的元素数， m 为 Count。

适用于

另请参阅