将元素插入C#中指定索引处的ArrayList中
要将元素插入到指定索引处的ArrayList中，代码如下-
示例
using System;
using System.Collections;
public class Demo {
public static void Main() {
ArrayList list = new ArrayList();
list.Add("One");
list.Add("Two");
list.Add("Three");
list.Add("Four");
list.Add("Five");
list.Add("Six");
list.Add("Seven");
list.Add("Eight");
Console.WriteLine("ArrayList elements...");
foreach(string str in list) {
Console.WriteLine(str);
}
Console.WriteLine("ArrayList is read-only? = "+list.IsReadOnly);
Console.WriteLine("Does the element Six in the ArrayList? = "+list.Contains("Six"));
list.Insert(4, "Twelve");
Console.WriteLine("ArrayList elements...UPDATED");
foreach(string str in list) {
Console.WriteLine(str);
}
}
}输出结果
这将产生以下输出-
ArrayList elements... One Two Three Four Five Six Seven Eight ArrayList is read-only? = False Does the element Six in the ArrayList? = True ArrayList elements...UPDATED One Two Three Four Twelve Five Six Seven Eight
示例
让我们看另一个例子-
using System;
using System.Collections;
public class Demo {
public static void Main() {
ArrayList arrList = new ArrayList();
arrList.Add(100);
arrList.Add(200);
arrList.Add(300);
arrList.Add(400);
arrList.Add(500);
Console.WriteLine("Display elements...");
IEnumerator demoEnum = arrList.GetEnumerator();
while (demoEnum.MoveNext()) {
Object ob = demoEnum.Current;
Console.WriteLine(ob);
}
arrList.Insert(4, 1000);
Console.WriteLine("Display elements...UPDATED");
demoEnum = arrList.GetEnumerator();
while (demoEnum.MoveNext()) {
Object ob = demoEnum.Current;
Console.WriteLine(ob);
}
}
}输出结果
这将产生以下输出-
Display elements... 100 200 300 400 500 Display elements...UPDATED 100 200 300 400 1000 500