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] {
//获取访问器。
get {
//返回由索引指定的值
}
//设置的访问器。
set {
//设置索引指定的值
}
}以下是显示如何在C#中实现索引器的示例-
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();
}
}
}输出结果
Tom Jacob Jack Amy Katy Taylor Brad Scarlett James N. A.