我为 ASP.NET WebForms 编写自己的控件。只有一个按钮。单击时，标签需要显示文本“Hello World”。但它没有发生。当我单击按钮时，标签文本不会改变。为什么？我的控制：
public class MyButton : Control, IPostBackEventHandler
{
protected override void Render(HtmlTextWriter writer)
{
writer.AddAttribute("type", "submit");
writer.AddAttribute("value", "ClickMe");
writer.AddAttribute("name", "BtnChange");
writer.RenderBeginTag(HtmlTextWriterTag.Input);
writer.RenderEndTag();
base.Render(writer);
}
public delegate void OnClickEventHandler(object sender, EventArgs args);
public event OnClickEventHandler Click1;
public void RaisePostBackEvent(string eventArgument)
{
Click1(this, new EventArgs());
}
}
我的 ASP 页面：
<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="TestButton.aspx.cs" Inherits="Hello.TestButton" %>
<%@ Register assembly="Hello" namespace="Hello" tagPrefix="MyButton" %>
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:Label ID="Label1" runat="server" Text="Label"></asp:Label>
<br />
<MyButton:MyButton runat="server" OnClick1="MyButton_OnClick"></MyButton:MyButton>
</div>
</form>
</body>
</html>
和页面处理程序：
namespace Hello
{
public partial class TestButton : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
}
protected void MyButton_OnClick(object sender, EventArgs args)
{
Label1.Text = "Hello World!";
}
}
}