新建一个自定义控件,该控件继承自TextBox控件。代码如下:
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using System;
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using System.Collections.Generic;
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using System.ComponentModel;
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using System.Text;
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using System.Web;
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using System.Web.UI;
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using System.Web.UI.WebControls;
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//引入该资源,注意,一次引用之后,在整个Web控件库中均可使用
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//或者是在AssemblyInfo.cs中也可以添加对该文件的使用
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//引用时资源时,其资源路径格式如下:命名空间.所在Folder.文件名
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[assembly: WebResource("GridViewExtention.Resources.alert.js", "text/javascript")]
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namespace GridViewExtention
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{
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[DefaultProperty("Text")]
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[ToolboxData("<{0}:TextBoxEx runat=server></{0}:TextBoxEx>")]
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public class TextBoxEx : TextBox
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{
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[Bindable(true)]
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[Category("Appearance")]
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[DefaultValue("")]
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[Localizable(true)]
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public override string Text
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{
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get
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{
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String s = (String)ViewState["Text"];
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return ((s == null) ? String.Empty : s);
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}
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set
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{
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ViewState["Text"] = value;
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}
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}
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protected override void OnPreRender(EventArgs e)
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{
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//注册脚本
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Page.ClientScript.RegisterClientScriptResource(this.GetType(), "GridViewExtention.Resources.alert.js");
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base.OnPreRender(e);
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}
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protected override void Render(HtmlTextWriter writer)
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{
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//为该控件添加上客户端的onchange事件
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writer.AddAttribute("onchange", "alertMsg(this.value);");
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base.Render(writer);
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}
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protected override void RenderContents(HtmlTextWriter output)
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{
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output.Write(Text);
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}
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}
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}
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