ASP.NET自定义Web服务器控件之Button控件

2020-01-17 23:19:29

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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：

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");  
    }  
}