ASP.NET用户控件事件的定义和实践

假定用户控件(UserControl.ascx)中包含按钮控件 AButton，希望实现按 Button 按钮时，包含该用户控件的页面可以接收到事件。

UserControl.ascx.cs 中的处理：

1. 定义 public 的事件委托，如 ClickEventHandler;

2. 在 UserControl 类中声明事件，如 Click;

3. 在 UserControl 类中定义引发事件的方法，如 OnClick()方法;

4. 在 UserControl 类的相关方法中调用引发事件的方法，如在 Button_Click()中调用 OnClick()。

下面这个例子是简单的响应点击事件

demo:buttonlist.aspx.cs

using System.Collections;

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 stoneControls

{

public delegate void ClickEventHandler(object sender, EventArgs e);

public partial class buttonList : System.Web.UI.UserControl

{

public event ClickEventHandler Click;

PRotected void OnClick(EventArgs e)

{

if (Click != null)

Click(this, e);

}

protected void lbnHome_OnClick(object sender, EventArgs e)

{

this.OnClick(e);

}

demo:buttonlist.aspx

<%@ Control Language="C#" AutoEventWireup="true" CodeBehind="buttonList.ascx.cs" Inherits="stoneControls.buttonList" %>

<table>

<tr>

</tr>

</table>

使用 ascx 控件

sample:buutonListTest .aspx

<htmlxmlns="http://www.w3.org/1999/xhtml" >

</head>

<body>

<div>

<uc1:buttonList ID="ButtonList1" runat="server" >

</div>

</form>

</body>

</html>

sample:buutonListTest .aspx.cs

using System;

using System.Data;

using System.Configuration;

using System.Collections;

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 stoneControls

{

public partial class buutonListTest : System.Web.UI.Page

{

protected void Page_Load(object sender, EventArgs e)

{

this.ButtonList1.Click+=new ClickEventHandler(ButtonList1_Click);

}

protected void ButtonList1_Click(object sender, EventArgs e)

{

Response.Write("AAAAAAAAAAAAAAAAAAAAAA");

}

我们进一步的构造一个带数据参数的事件，利用.net 自带的 commandeventargs，当然可以自己构造一个，去继承 eventargs 就行了。

将上面的委托和事件改改，如下：

public delegate void ClickCmandHandler(object sender,CommandEventArgs e);

public partial class buttonList : System.Web.UI.UserControl

{

public event ClickCmandHandler Click;

protected void OnClick(CommandEventArgs e)

{

if (Click != null)

Click(this, e);

}

protected void lbnHome_OnClick(object sender,CommandEventArgs e)

{

this.OnClick(e);

}

页面的文件也相应做下修改：

<%@ Control Language="C#" AutoEventWireup="true" CodeBehind="buttonList.ascx.cs" Inherits="stoneControls.buttonList" %>

<table>

<tr>

<td>

<asp:LinkButton ID="lbnHome" runat="Server" CommandName="HOME" Text="首页" OnCommand="lbnHome_OnClick">

</asp:LinkButton>

</td>

<td>

<asp:LinkButton ID="lbnChannel" runat="Server" CommandName="CHANNEL" Text="频道" OnCommand="lbnHome_OnClick">

</asp:LinkButton>

</td>

<td>

<asp:LinkButton ID="lbnColumn" runat="Server" CommandName="COLUMN" Text="栏目" OnCommand="lbnHome_OnClick">

</asp:LinkButton>

</td>

<td>

<asp:LinkButton ID="lbnSoft" runat="Server" CommandName="DETAILS" Text="明细" OnCommand="lbnHome_OnClick">

</asp:LinkButton>

</td>

</tr>

</table>

调用控件改动下注册的参数就可以了。。

protected void Page_Load(object sender, EventArgs e)

{

this.ButtonList1.Click+=new ClickCmandHandler(ButtonList1_Click);

}

protected void ButtonList1_Click(object sender,CommandEventArgs e)

{

if (e.CommandName == "DETAILS")

{

}

if (e.CommandName == "COLUMN")

{

}

if (e.CommandName == "CHANNEL")

{

}

if (e.CommandName == "HOME")

{

}

这样子一个简单的页面导航的控件基本出来，根据在 commandname 的不同跳转！！