C＃|将元素添加到ArrayList的末尾

ArrayList.AddRange(ICollection)方法用于将ICollection的元素添加到ArrayList的末尾。

句法：

public virtual void AddRange (System.Collections.ICollection c);

在这里， c是ICollection，其元素应添加到ArrayList的末尾。集合本身不能为null ，但可以包含null的元素。

例外情况：

• ArgumentException：如果c为null
• NotSupportedException：如果ArrayList为只读或ArrayList具有固定大小。

下面的程序说明了上述方法的用法：

范例1：

// C# code to add the elements of an
// ICollection to the end of the ArrayList
using System;
using System.Collections;
  
class GFG {
  
    // Driver code
    public static void Main()
    {
  
        // Creating an ArrayList
        ArrayList myList = new ArrayList();
  
        // Adding elements to ArrayList
        myList.Add("A");
        myList.Add("B");
        myList.Add("C");
        myList.Add("D");
        myList.Add("E");
        myList.Add("F");
  
        Console.WriteLine("Before AddRange Method");
        Console.WriteLine();
  
        // displaying the item of myList
        foreach(String str in myList)
        {
            Console.WriteLine(str);
        }
  
        Console.WriteLine("\nAfter AddRange Method\n");
  
        // Here we are using AddRange method
        // Which adds the elements of myList
        // Collection in myList again i.e.
        // we have copied the whole myList
        // in it
        myList.AddRange(myList);
  
        // displaying the item of List
        foreach(String str in myList)
        {
            Console.WriteLine(str);
        }
    }
}

输出：

Before AddRange Method

A
B
C
D
E
F

After AddRange Method

A
B
C
D
E
F
A
B
C
D
E
F

范例2：

// C# code to add the elements of an
// ICollection to the end of the ArrayList
using System;
using System.Collections;
  
class GFG {
  
    // Driver code
    public static void Main()
    {
  
        // Creating an ArrayList
        ArrayList myList = new ArrayList();
  
        // adding elements in myList
        myList.Add("Geeks");
        myList.Add("GFG");
        myList.Add("C#");
        myList.Add("Tutorials");
  
        Console.WriteLine("Before AddRange Method");
        Console.WriteLine();
  
        // displaying the item of myList
        foreach(String str in myList)
        {
            Console.WriteLine(str);
        }
  
        Console.WriteLine("\nAfter AddRange Method\n");
  
        // taking array of String
        string[] str_add = { "Collections",
                             "Generic",
                             "List" };
  
        // here we are adding the elements
        // of the str_add to the end of
        // the myList
        myList.AddRange(str_add);
  
        // displaying the item of List
        foreach(String str in myList)
        {
            Console.WriteLine(str);
        }
    }
}

输出：

Before AddRange Method

Geeks
GFG
C#
Tutorials

After AddRange Method

Geeks
GFG
C#
Tutorials
Collections
Generic
List

笔记：

• ArrayList接受null作为有效值，并允许重复的元素。
• ICollection中元素的顺序保留在ArrayList中。

参考：

• https://docs.microsoft.com/zh-cn/dotnet/api/system.collections.arraylist.addrange?view=netframework-4.7.2