C#中this的用法，你用过几种？【含源码示例】

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app_code:

using System;
using System.Collections.Generic;
using System.Web;
using System.Collections;
using System.Collections.Specialized;

/// <summary>
///Person 的摘要说明
/// </summary>
public class Person
{
    /// <summary>
    /// 姓名
    /// </summary>
    public string Name { set; get; }

    /// <summary>
    /// 性别
    /// </summary>
    public string Sex { set; get; }

    /// <summary>
    /// 其它属性
    /// </summary>
    public NameValueCollection Attr = new NameValueCollection();

    public Person()
    {
    }

    /// <summary>
    /// /******************************************/
    /// /* this用法1：限定被相似的名称隐藏的成员 */
    /// /******************************************/
    /// </summary>
    /// <param name="Name"></param>
    public Person(string Name, string Sex)
{
        this.Name = Name;
        this.Sex = Sex;
}

    /// <summary>
    /// /*******************************************/
    /// /* this用法2：将对象作为参数传递到其他方法 */
    /// /*******************************************/
    /// </summary>
    public void ShowName()
    {
        Helper.PrintName(this);
    }

    /// <summary>
    /// /*************************/
    /// /* this用法3：声明索引器 */
    /// /*************************/
    /// </summary>
    /// <param name="key"></param>
    /// <returns></returns>
    public string this[string key]
    {
        set
        {
            Attr[key] = value;
        }

        get
        {
            return Attr[key];
        }
    }

}

/// <summary>
/// 辅助类
/// </summary>
public static class Helper
{
    /// <summary>
    /// /*****************************/
    /// /* this用法4：扩展对象的方法 */
    /// /*****************************/
    /// </summary>
    /// <param name="item"></param>
    /// <returns></returns>
    public static string GetSex(this Person item)
    {
        return item.Sex;
    }

    /// <summary>
    /// 打印人名
    /// </summary>
    /// <param name="person"></param>
    public static void PrintName(Person person)
    {
        HttpContext.Current.Response.Write("姓名：" + person.Name + "<br />");
    }

}

default.aspx:

using System;
using System.Collections.Generic;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

public partial class _Default : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        /*********************************
         *
         * 作者：Foolin
         * 邮箱：Foolin@126.com
         * 博客：http://www.cnblogs.com/foolin
         * 日期：2011-10-11 01:28:15
         *
         * *********************************/

//this用法1示例
Person person = new Person("小她", "女");

//this用法2示例
person.ShowName();

        //this用法3示例
        person["Height"] = "175cm";
        Response.Write("身高：" + person["Height"] + "<br />");
        person["Weight"] = "110kg";
        Response.Write("体重：" + person["Weight"] + "<br />");

//this用法4示例
Response.Write("性别：" + person.GetSex() + "<br />");

}
}