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ASP.NET自定义Web服务器控件之Button控件
日期：2021-09-07 22:00:51 来源：脚本之家

本文实例讲述了ASP.NET自定义Web服务器控件之Button控件实现方法。分享给大家供大家参考。具体实现方法如下：

复制代码代码如下:

using System;  

using System.Collections.Generic;  

using System.ComponentModel;  

using System.Linq;  

using System.Text;  

using System.Web;  

using System.Web.UI;  

using System.Web.UI.WebControls;  

//自定义web服务器button  

namespace MyControls  

{  

    [DefaultProperty("Text")]  

    [ToolboxData("<{0}:MyButton runat=server></{0}:MyButton>")]  

    public class MyButton : WebControl,IPostBackEventHandler  

    {  

        [Bindable(true)]  

        [Category("Appearance")]  

        [DefaultValue("")]  

        [Localizable(true)]  

        public string Text  

        {  

            get  

            {  

                String s = (String)ViewState["Text"];  

                return ((s == null) ? String.Empty : s);  

            }  

            set  

            {  

                ViewState["Text"] = value;  

            }  

        }  

        [DesignerSerializationVisibility(DesignerSerializationVisibility.Content)]//生成属性时，按属性内部内容生成(例如在此控件里面(Size-Height,Size_Width))  

        //[PersistenceMode(PersistenceMode.InnerProperty)]//以子标签的形式显示(例如<Size Width="" Height=""/>)  

        public Size Size  

        {  

            get  

            {  

                if (ViewState["Size"] == null) {  

                    ViewState["Size"] = new Size();  

                }  

                return (Size)ViewState["Size"];  

            }  

            set  

            {  

                ViewState["Size"] = value;  

            }  

        }  

        //定义控件的标签形式  

        protected override HtmlTextWriterTag TagKey  

        {  

            get  

            {  

                return HtmlTextWriterTag.Input;  

            }  

        }  

        //初始化  

        protected override void OnInit(EventArgs e)  

        {  

            this.Style.Add("width", Size.Width + "px");  

            this.Style.Add("height", Size.Height + "px");  

            this.Attributes.Add("type", "submit"); //提交按钮  

            this.Attributes.Add("value",Text);  

            this.Attributes.Add("name",this.UniqueID);//回发事件必须有的一个属性  

            base.OnInit(e);  

        }  

        //打印当前控件的内容  

        protected override void RenderContents(HtmlTextWriter output)  

        {  

            //output.Write(Text);  

        }  

        public delegate void ClickHandle();  

        private object key=new object();  

        public event ClickHandle Click {  

            add {  

                this.Events.AddHandler(key,value);  

            }  

            remove {  

                this.Events.RemoveHandler(key, value);  

            }  

        }  

        //按钮的回发事件  

        public void RaisePostBackEvent(string eventArgument)  

        {  

            ClickHandle handle = (ClickHandle)base.Events[key];  

            if (handle != null) {  

                handle();  

            }  

        }  

    }  

}

复制代码代码如下:

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>  

<%@ Register assembly="MyControls" namespace="MyControls" tagprefix="cc1" %>  

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">  

<html xmlns="http://www.w3.org/1999/xhtml">  

<head runat="server">  

    <title></title>  

</head>  

<body>  

    <form id="form1" runat="server">  

    <div>  

    <!--自定义服务器按钮控件-->  

        <cc1:MyButton ID="MyButton1" Size-Height="30" Size-Width="290" OnClick="btnSubmit" Text="我是一个单独的提交按钮(自定义服务器)" runat="server" />  

    </div>  

    </form>  

</body>  

</html>

复制代码代码如下:

using System;  

using System.Collections.Generic;  

using System.Linq;  

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)  

    {  

    }  

    //自定义服务器控件  

    protected void btnSubmit() {  

        Response.Write("我是自定义服务器控件的点击事件");  

    }  

}