从父ASP.NET页面处理用户控件中的LinkButton的Click事件(Handle Click Event for LinkButton in User Control from Parent

从父ASP.NET页面处理用户控件中的LinkButton的Click事件(Handle Click Event for LinkButton in User Control from Parent ASP.NET page)

我在用户控件中有一个LinkBut​​ton，它处理了：

Private Sub LoginLinkLinkButton_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles LoginLinkLinkButton.Click Response.Redirect("/", True) End Sub

在某些ASPX页面上，我想处理页面代码后面的点击，与用户控件内部相反。 如何从父页面后面的代码覆盖控件中的句柄？

更新：根据答案，我更新了用户控件：

Public Event LoginLinkClicked As OnLoginClickHandler Public Delegate Sub OnLoginClickHandler(ByVal sender As Object, ByVal e As EventArgs) [...] Private Sub LoginLinkLinkButton_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles LoginLinkLinkButton.Click **If OnLoginClickHandler IsNot Nothing Then** RaiseEvent LoginLinkClicked(Me, e) Else Response.Redirect("/", True) End If End Sub

问题是确定if行的正确语法，因为上面的内容无效。

I have a LinkButton within a User Control and it has handled with:

Private Sub LoginLinkLinkButton_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles LoginLinkLinkButton.Click Response.Redirect("/", True) End Sub

On certain ASPX pages I would like to handle the click from the page's code behind, opposed to within the user control. How do I override the handle within the control from the parent's code behind page?

Update: Based on the answer, I have the updated the User Control:

Public Event LoginLinkClicked As OnLoginClickHandler Public Delegate Sub OnLoginClickHandler(ByVal sender As Object, ByVal e As EventArgs) [...] Private Sub LoginLinkLinkButton_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles LoginLinkLinkButton.Click **If OnLoginClickHandler IsNot Nothing Then** RaiseEvent LoginLinkClicked(Me, e) Else Response.Redirect("/", True) End If End Sub

The problem is determining the correct syntax for the if line because the above is invalid.

最满意答案

您必须从用户控件中公开新事件。 道歉如下面的代码全部都在C＃中 ，自从我触及VB.Net以来已经很久了，但你应该明白这个想法：

您可以通过将以下内容添加到UserControl来使用委托事件：

public event OnLoginClickHandler LoginClick; public delegate void OnLoginClickHandler (object sender, EventArgs e);

然后将以下内容调用到LinkBut​​ton Click事件：

protected void LoginLinkLinkButton_Click(object sender, EventArgs e) { // Only fire the event if there's a subscriber if (OnLoginClickHandler != null) { OnLoginClickHandler(sender, e); } else { // Not handled, so perform the standard redirect Response.Redirect("/", true); } }

然后，您可以在aspx标记中连接到这个：

<asp:LinkButton runat="server" ID="Foo" OnLoginClick="Foo_LoginClick" />

您页面上的服务器端事件处理程序如下：

protected void Foo_LoginClick_Click(object sender, EventArgs e) { // This event was fired from the UserControl }

UPDATE

我认为这是您将事件订阅检查转换为VB.Net的方式：

If LoginClick IsNot Nothing Then RaiseEvent LoginClick(sender, e) End If

You'll have to expose a new event from the user control. Apologies as the following code is all in C# and it's been a long time since I touched VB.Net, but you should get the idea:

You can use a delegate event by adding the following to your UserControl:

public event OnLoginClickHandler LoginClick; public delegate void OnLoginClickHandler (object sender, EventArgs e);

Then call the following to your LinkButton Click event:

protected void LoginLinkLinkButton_Click(object sender, EventArgs e) { // Only fire the event if there's a subscriber if (OnLoginClickHandler != null) { OnLoginClickHandler(sender, e); } else { // Not handled, so perform the standard redirect Response.Redirect("/", true); } }

You can then just hook up into this within your aspx markup:

<asp:LinkButton runat="server" ID="Foo" OnLoginClick="Foo_LoginClick" />

And your server side event handler on your Page will be as follows:

protected void Foo_LoginClick_Click(object sender, EventArgs e) { // This event was fired from the UserControl }

UPDATE

I think this is how you translate the event subscription check to VB.Net:

If LoginClick IsNot Nothing Then RaiseEvent LoginClick(sender, e) End If