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初学asp.net(C#）事件

2007-04-30 23:11 429 查看

写一个触发随机事件，分别显示不同的值，原因不太清楚．

后台控件代码：

using System;

using System.Data;

using System.Configuration;

using System.Web;

using System.Web.Security;

using System.Web.UI;

using System.Web.UI.WebControls;

using System.Web.UI.WebControls.WebParts;

using System.Web.UI.HtmlControls;

namespace myControls

...{

/**//// <summary>

/// RandomEvent 的摘要说明

/// </summary>

public class RandomEvent : Control

...{

public delegate void Event(Object sender, EventArgs e);

public event Event Event1;

public event Event Event2;

protected override void Render(HtmlTextWriter writer)

...{

Random objRnd = new Random();

int i = objRnd.Next(2);

if (i == 0)

...{

Event1(this, EventArgs.Empty);

}

else

...{

Event2(this, EventArgs.Empty);

}

前台显示代码：

<%@ Page Language="C#" %>

<%@ Register Namespace="myControls" TagPrefix="myControls" Assembly="RandomEvent" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

void DisplayA(Object sender, EventArgs e)

...{

lbl.Text = "显示了A";

}

void DisplayB(Object sender, EventArgs e)

...{

lbl.Text = "显示了B";

}

</script>

</head>

<body>

<div>

<myControls:RandomEvent ID="ctl" runat="server" OnEvent1="DisplayA" OnEvent2="DisplayB"

<asp:Label ID="lbl" runat="server" />

</div>

</form>

</body>

</html>

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