C#类索引器的使用

索引器提供了一种可以让类被当作数组进行访问的方式。在C#中，类索引器是通过this的属性实现的。

index.ToString("D2")

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将index转换成一个具有两个字符宽度的字符串

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace ClassIndexer
{
/// <summary>
/// define a class called AClass,which has only one private variable
/// </summary>
class AClass {
private string _name;
public string Name {
get { return this._name; }
set { this._name = value; }
}
public AClass(string name) {
this._name = name;
}
}
/// <summary>
/// AClassContainer class
/// </summary>
class AClassContainer {
private AClass[] _AClassList;
public AClassContainer() {
this._AClassList = new AClass[10];
}
public AClassContainer(int cap) {
this._AClassList = new AClass[cap];
}
/// <summary>
/// class indexer by using int
/// </summary>
/// <param name="index"></param>
/// <returns></returns>
public AClass this[int index] {
get {
if ((index < 0) || (index > this._AClassList.Length)) return null;
else return this._AClassList[index];
}
set {
if ((index < 0) || (index > this._AClassList.Length)) return;
else this._AClassList[index] = value;
}
}
/// <summary>
/// class indexer by using string
/// </summary>
/// <param name="name"></param>
/// <returns></returns>
public AClass this[string name] {
get {
foreach (AClass cls in this._AClassList) {
if (cls.Name == name) return cls;
}
return null;
}
}
}
class Program
{
static void Main(string[] args)
{
int count = 10;
AClassContainer classContainer = new AClassContainer(count);
for (int index = 0; index < count; index++) {
string name = index.ToString("D2");
classContainer[index] = new AClass(name);
}
for (int index = 0; index < count; index++)
{
AClass cls = classContainer[index];
System.Console.WriteLine("classContainer[{0}].Name=\"{1}\"",index,cls.Name);
}
System.Console.WriteLine();
for (int index = count - 1; index >= 0; index--) {
string name = index.ToString("D2");
AClass cls = classContainer[name];
System.Console.WriteLine("classContainer[{0}].Name=\"{1}\"",name,cls.Name);
}
System.Console.ReadLine();
}
}
}

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结果：

classContainer[0].Name="00"classContainer[1].Name="01"classContainer[2].Name="02"classContainer[3].Name="03"classContainer[4].Name="04"classContainer[5].Name="05"classContainer[6].Name="06"classContainer[7].Name="07"classContainer[8].Name="08"classContainer[9].Name="09"classContainer[09].Name="09"classContainer[08].Name="08"classContainer[07].Name="07"classContainer[06].Name="06"classContainer[05].Name="05"classContainer[04].Name="04"classContainer[03].Name="03"classContainer[02].Name="02"classContainer[01].Name="01"classContainer[00].Name="00"

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C#类索引器的使用

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