Custom ServerControl

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

namespace ServerControl.Controls
{
    publicclass MostSimpleControl:Control
    {
        // Control类的呈现架构就是这样在三个方法之间递归的调用，以便把控件的逻辑呈现为html代码。 

        protectedoverridevoid Render(HtmlTextWriter writer)
        {
            writer.AddAttribute(HtmlTextWriterAttribute.Onclick, "alert('you clicked me')");
            writer.Write("<span>");
            writer.Write("I am useless,but i am a control!");
            writer.Write("<span>");

            CheckBox rbtn =new CheckBox();
            rbtn.Checked =true;
            this.Controls.Add(rbtn);

            RenderChildren(writer);
        }

        publicoverridevoid RenderControl(HtmlTextWriter writer)
        {
            this.Render(writer);
        }

        protectedoverridevoid RenderChildren(HtmlTextWriter writer)
        {
            foreach (Control child inthis.Controls)
            {
                child.RenderControl(writer);
            }
        }
    }
}

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

namespace ServerControl.Controls
{
    publicclass CustomLabel:Label
    {
        [Description("The Label's Default Text")]
        publicvirtualstring DefaultText
        {
            get
            {
                string s=(string)ViewState["userName"];
                return s==null?string.Empty:s;
            }
            set
            {
                ViewState["userName"] = value;
            }
        }

        protectedoverridevoid RenderContents(System.Web.UI.HtmlTextWriter writer)
        {
            writer.WriteEncodedText("Welcome "+DefaultText);
            
            //writer.WriteEncodedText(this.Text);
        }
    }
}

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

[assembly: TagPrefix("ServerControl", "SControl")]
namespace ServerControl.Controls
{
    [DefaultProperty("ButtonText")]
    publicclass SearchControl : CompositeControl
    {
        protected TextBox txtBox =new TextBox();
        protected Button btn =new Button();

        protectedoverridevoid CreateChildControls()
        {
            //base.CreateChildControls();
this.Controls.Add(txtBox);
            this.Controls.Add(btn);

            btn.Text ="搜索";
            btn.Click +=new EventHandler(btn_Click);
        }


        publicevent EventHandler Serch_Click;

        protectedvoid btn_Click(object sender, EventArgs e)
        {
            try
            {
                Serch_Click(sender, e);
            }
            catch (Exception ex)
            {
                //throw new Exception("没有实现Serch_Click委托", ex.InnerException);
            }
        }

        ///<summary>
        /// 获取或设置录入框文本
        ///</summary>
publicstring Text
        {
            get
            {
                EnsureChildControls();
                return txtBox.Text;
            }
            set
            {
                EnsureChildControls();
                txtBox.Text = value;
            }
        }

        ///<summary>
        /// 获取或设置按钮文本
        ///</summary>
publicstring ButtonText
        {
            get
            {
                EnsureChildControls();
                return btn.Text;
            }
            set
            {
                EnsureChildControls();
                btn.Text = value;
            }
        }
    }
}

    public class ArgButton:Button
    {
        public delegate void OnArgClick(btnEventArgs e);

        public event OnArgClick ArgClick;

        private string Args
        {
            get;
            set;
        }

        public ArgButton()
        { }

        public ArgButton(string args)
        {
            this.Args = args;
            this.Click += new EventHandler(ArgButton_Click);
        }

        void ArgButton_Click(object sender, EventArgs e)
        {
            if (ArgClick != null)
            {
                ArgClick(new btnEventArgs(Args));
            }
        }
    }

    public class btnEventArgs:EventArgs
    {
        private string args;
        public btnEventArgs(string args)
        {
            this.args = args;
        }

        public string Args
        {
            get { return this.args; }
        }
    }

default.aspx前后台：（注意：CustomLabel的Text属性无效，因为在重写的时候去掉了base方法。）

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

<%@ Register assembly="ServerControl" namespace="ServerControl.Controls" 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:MostSimpleControl ID="MostSimpleControl1" runat="server">
        </cc1:MostSimpleControl>
        <cc1:SearchControl ID="SControl1" OnSerch_Click="SControl1_Serch_Click" runat="server" ButtonText="确定"/>
        <cc1:CustomLabel ID="CustomLabel1" Text="ddd" runat="server"></cc1:CustomLabel>
    </div>
    </form>
</body>
</html>

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

namespace ServerControl
{
    publicpartialclass Default : System.Web.UI.Page
    {
        privatefloat getInternetExplorerVersion()
        {
            float rev =-1;
            System.Web.HttpBrowserCapabilities browser = Request.Browser;
            if (browser.Browser =="IE")
                rev = (float)(browser.MajorVersion + browser.MinorVersion);
            return rev;
        }


        protectedvoid Page_Load(object sender, EventArgs e)
        {
           //SControl1.Serch_Click+=new EventHandler(SControl1_Serch_Click);
           CustomLabel1.DefaultText ="jemmy";
        }

        protectedvoid SControl1_Serch_Click(object sender, EventArgs e)
        {
            ClientScript.RegisterStartupScript(typeof(Page), "alert", "<script type='text/javascript'>alert('"+SControl1.Text+"')</script>");
        }
    }
}