自定义特性用途---案例：操作权限

--------------------------------------------------LimitAttribute.cs 自定义特性

using System;using System.Collections.Generic;using System.Linq;using System.Web;/// 
/// LimitAttribute 的摘要说明/// 
//特性只作用与方法上[AttributeUsage(AttributeTargets.Method)]public class LimitAttribute:Attribute{    private string _name;    public string Name    {        get { return _name; }    } public LimitAttribute(string name) {        this._name = name; }}

--------------------------------------------------Default.aspx

using System;using System.Collections.Generic;using System.Linq;using System.Web;using System.Web.UI;using System.Web.UI.WebControls;using System.Reflection;public partial class _Default : System.Web.UI.Page{    public static readonly string _name = "李四";    protected void Page_Load(object sender, EventArgs e)    {    }    /// 
    /// 判断该用户是否有执行权限    /// 
    /// 用户名称    /// 方法名称    ///     private bool IsLimit(string name, string method)    {        //获取该类型        Type t = typeof(_Default);        //查找该方法        MethodInfo mi = t.GetMethod(method);        if (mi == null)            return false;                //获取方法上的特性        LimitAttribute la = Attribute.GetCustomAttribute(mi, typeof(LimitAttribute)) as LimitAttribute;        if (la == null)            return false;                //判断用户        if (la.Name == name)        {            return true;        }        else        {            return false;        }    }    [Limit("张三")]    public void btnView_Click(object sender, EventArgs e)    {        if (IsLimit(_name, "btnView_Click"))        {            ClientScript.RegisterStartupScript(this.GetType(), "ClientScript", "alert('我是查看')", true);        }        else        {            ClientScript.RegisterStartupScript(this.GetType(), "ClientScript", "alert('对不起，您没有权限操作')", true);        }    }    [Limit("李四")]    public void btnEdit_Click(object sender, EventArgs e)    {        if (IsLimit(_name, "btnEdit_Click"))        {            ClientScript.RegisterStartupScript(this.GetType(), "ClientScript", "alert('我是修改')", true);        }        else        {            ClientScript.RegisterStartupScript(this.GetType(), "ClientScript", "alert('对不起，您没有权限操作')", true);        }    }    [Limit("李四")]    public void btnAdd_Click(object sender, EventArgs e)    {        if (IsLimit(_name, "btnAdd_Click"))        {            ClientScript.RegisterStartupScript(this.GetType(), "ClientScript", "alert('我是添加')", true);        }        else        {            ClientScript.RegisterStartupScript(this.GetType(), "ClientScript", "alert('对不起，您没有权限操作')", true);        }    }    [Limit("王五")]    public void btnDel_Click(object sender, EventArgs e)    {        if (IsLimit(_name, "btnDel_Click"))        {            ClientScript.RegisterStartupScript(this.GetType(), "ClientScript", "alert('我是删除')", true);        }        else        {            ClientScript.RegisterStartupScript(this.GetType(), "ClientScript", "alert('对不起，您没有权限操作')", true);        }    }}