List<T>.AddRange(IEnumerable<T>) 方法

定义

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

将指定集合的元素添加到该 List<T>集合的末尾。

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>

应将元素添加到末尾的 List<T>集合。 集合本身不能null，但如果类型null是引用类型，则它可以包含元素T。

例外

ArgumentNullException

collection 是 null。

示例

下面的示例演示 AddRange 对范围执行操作的 List<T> 类的方法和其他各种方法。 创建字符串数组并将其传递给构造函数，并使用数组的元素填充列表。 调用 AddRange 该方法，列表作为其参数。 结果是将列表的当前元素添加到列表末尾，复制所有元素。

using System;
using System.Collections.Generic;

string[] input = { "Apple",
                   "Banana",
                   "Orange" };

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

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

foreach (string fruit in fruits)
{
    Console.WriteLine(fruit);
}

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

Console.WriteLine();
foreach (string fruit in fruits)
{
    Console.WriteLine(fruit);
}

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

Console.WriteLine();
foreach (string fruit in fruits)
{
    Console.WriteLine(fruit);
}

input = new string[] { "Mango",
                       "Pineapple",
                       "Watermelon" };

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

Console.WriteLine();
foreach (string fruit in fruits)
{
    Console.WriteLine(fruit);
}

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

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

/*
    This code example produces the following output:

    Capacity: 3

    Apple
    Banana
    Orange

    AddRange(fruits)

    Apple
    Banana
    Orange
    Apple
    Banana
    Orange

    RemoveRange(2, 2)

    Apple
    Banana
    Banana
    Orange

    InsertRange(3, input)

    Apple
    Banana
    Banana
    Mango
    Pineapple
    Watermelon
    Orange

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

    Banana
    Mango
    Pineapple
*/

Imports System.Collections.Generic

Partial Public Class Program
    Public Shared Sub ShowFruits()

        Dim input() As String = { "Apple", _
                                  "Banana", _
                                  "Orange" }

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

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

        For Each fruit As String In fruits
            Console.WriteLine(fruit)
        Next

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

        Console.WriteLine()
        For Each fruit As String In fruits
            Console.WriteLine(fruit)
        Next

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

        Console.WriteLine()
        For Each fruit As String In fruits
            Console.WriteLine(fruit)
        Next

        input = New String() { "Mango", _
                               "Pineapple", _
                               "Watermelon" }

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

        Console.WriteLine()
        For Each fruit As String In fruits
            Console.WriteLine(fruit)
        Next

        Console.WriteLine(vbLf & "output = fruits.GetRange(2, 3).ToArray")
        Dim output() As String = fruits.GetRange(2, 3).ToArray()

        Console.WriteLine()
        For Each fruit As String In output
            Console.WriteLine(fruit)
        Next

    End Sub
End Class

' This code example produces the following output:
'
' Capacity: 3
'
' Apple
' Banana
' Orange
'
' AddRange(fruits)
'
' Apple
' Banana
' Orange
' Apple
' Banana
' Orange
'
' RemoveRange(2, 2)
'
' Apple
' Banana
' Banana
' Orange
'
' InsertRange(3, input)
'
' Apple
' Banana
' Banana
' Mango
' Pineapple
' Watermelon
' Orange
'
' output = fruits.GetRange(2, 3).ToArray
'
' Banana
' Mango
' Pineapple

注解

集合中元素的顺序保留在集合中 List<T>。

如果新的 Count （当前 Count 加上集合的大小）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该 List<T> 集合的容量，并在添加新元素之前将现有元素复制到新数组。

List<T>如果可以容纳新元素而不增加Capacity，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）操作，其中 n 是要添加的元素数和 mCount。

适用于

另请参阅