ASP.NET自定义Web服务器控件之Button控件

网络编程 2024/11/18 佚名

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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：

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) "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>
    
        <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");
    }
}