处理列表视图中的用户控件的事件 [英] Handling events of usercontrols within listview

问题描述

我有一个简单的用户控件该按钮点击引发事件

I have a simple usercontrol which raises an event on button click

Public Class UcPaymentCheque
    Inherits System.Web.UI.UserControl

    Public Event OnCancelClick()

    Private Sub btnCancelPayment_Click(sender As Object, e As System.EventArgs) Handles btnCancelPayment.Click
        RaiseEvent OnCancelClick()
    End Sub
End Class

此用户控件列表视图中使用

This usercontrol is used within a listview

<asp:ListView ID="lvwNonTpProducts" runat="server" ItemPlaceholderID="ItemPlaceholder">
    <LayoutTemplate>
        <asp:PlaceHolder ID="ItemPlaceholder" runat="server" />
    </LayoutTemplate>
    <ItemTemplate>
        <TPCustomControl:UcPaymentCheque ID="UcTPPaymentCheque" runat="server" Visible="false" />
    </ItemTemplate>
</asp:ListView>

这是数据绑定在页面加载

which is databound on page load

Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
    If Page.IsPostBack Then

    Else
        BuildPage()
    End If
End Sub

在什么时候应该添加处理程序？我曾经摆弄像这样的事件ondatabound;

At what point should add the handler? I have fiddled with the ondatabound event like so;

Private Sub lvwNonTpProducts_ItemDataBound(sender As Object, e As System.Web.UI.WebControls.ListViewItemEventArgs) Handles lvwNonTpProducts.ItemDataBound
    Dim UcTPPaymentCheque = DirectCast(e.Item.FindControl("UcTPPaymentCheque"), UcPaymentCheque)
    AddHandler UcTPPaymentCheque.OnCancelClick, AddressOf OnCancelClick
End Sub

但是，这并不工作，并在数据绑定的问题???

but this does not work and am guess at a databound issue???

推荐答案

您可以检查出我在这里类似的问题回应：<一href=\"http://stackoverflow.com/questions/15096396/creating-and-listening-for-events/15097411#comment21242785_15097411\">creating和监听事件

You can check out my response to a similar question here: creating and listening for events

从本质上讲，你想一个用户控件，以提高自己的事件，如：

Essentially, you want a user control to raise its own event, like this:

Partial Class myControl
    Inherits System.Web.UI.UserControl
    Public Event MyEvent As EventHandler

    'your button click event
    Protected Sub bnt_click(ByVal sender As Object, ByVal e As EventArgs)
      'do stuff
      'now raise the event
       RaiseEvent MyEvent (Me, New EventArgs)
    end sub
end class

在这个例子中，我引发事件，当用户点击用户控件中的一个按钮。可以很容易地在任何地方提高的情况下，例如当控制负载，使用计时器，无论如。

In this example, I raise the event when the user clicks a button within the user control. You can easily raise the event anywhere, such as when the control loads, using a timer, whatever.

然后，在主页上，你想和一个事件处理程序到用户控件，像这样的：

Then, in the main page, you want to and an event handler to the user control, like this:

<mc:myControlrunat="server" ID="myControl1" OnMyEvent="myControl_MyEvent"  /> 

现在，在code的背后，你可以添加事件，像这样：

Now, in the code behind, you can add the event, like this:

Protected Sub myControl_MyEvent(ByVal sender As Object, ByVal e As EventArgs)
 'do stuff 
end sub

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