自定义控件学习笔记（四）

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自定义控件学习笔记（三）－－如何获取客户提交数据

1。要点

1）继承接口IPostBackDataHandler

2）重写LoadPostData

3）在LoadPostData中，通过postCollection[postDataKey]获取客户的提交

2。控件

using System;

using System.Web.UI;

using System.Collections.Specialized;

namespace TestCustomControl

{

public class DealPostBackData : Control,IPostBackDataHandler

{

private string text="";

public string Text

{

get { return text; }

set { text = value; }

}

protected override void Render(HtmlTextWriter writer)

{

writer.WriteBeginTag("input");

writer.WriteAttribute("name", UniqueID);

if (ID != null)

{

writer.WriteAttribute("id", ClientID);

}

if (text.Length > 0)

{

writer.WriteAttribute("value", text);

}

writer.Write(HtmlTextWriter.TagRightChar);

writer.WriteEndTag("input");

}

public bool LoadPostData(string postDataKey,NameValueCollection postCollection)

{

text=postCollection[postDataKey];

return false;

}

public void RaisePostDataChangedEvent()

{

}

3。用法

前台

<%...@ Page Language="C#" AutoEventWireup="true" CodeFile="DealPostBackData.aspx.cs" Inherits="TestCustomControl_First_DealPostBackData" %>
<%...@ Register Assembly="DealPostBackData" TagPrefix="Surance" Namespace="TestCustomControl" %>
<!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>无标题页</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
    <Surance:DealPostBackData ID="D1" runat="server" Text="Type Something" />
    <asp:Button ID="B1" Text="Click" runat="server" OnClick="B1_Click" />
    </div>
    </form>
</body>
</html>

后台：

protected void B1_Click(object sender, EventArgs e)

{

Response.Write(this.D1.Text);

}