C# 中的索引器是什么?
csharpprogrammingserver side programming更新于 2025/10/14 14:52:17
索引器允许对对象(例如数组)进行索引。
让我们看看语法 −
element-type this[int index] {
// get 访问器。
get {
// 返回索引指定的值
}
// set 访问器。
set {
// 设置索引指定的值
}
}
以下示例展示了如何在 C# 中实现索引器−
示例
using System;
namespace Demo {
class Program {
private string[] namelist = new string[size];
static public int size = 10;
public Program() {
for (int i = 0; i < size; i++)
namelist[i] = "N. A.";
}
public string this[int index] {
get {
string tmp;
if( index >= 0 && index <= size-1 ) {
tmp = namelist[index];
} else {
tmp = "";
}
return ( tmp );
}
set {
if( index >= 0 && index <= size-1 ) {
namelist[index] = value;
}
}
}
static void Main(string[] args) {
Program names = new Program();
names[0] = "Tom";
names[1] = "Jacob";
names[2] = "Jack";
names[3] = "Amy";
names[4] = "Katy";
names[5] = "Taylor";
names[6] = "Brad";
names[7] = "Scarlett";
names[8] = "James";
for ( int i = 0; i < Program.size; i++ ) {
Console.WriteLine(names[i]);
}
Console.ReadKey();
}
}
}
输出
Tom Jacob Jack Amy Katy Taylor Brad Scarlett James N. A.
