I have an asp.net web application. I have created a user control. The user control has an event handler that the parent page (.aspx file) can call. That .aspx page uses a repeater to make several of the user controls. If I put a single user control outside the repeater and add the event handler in Page_Load it works how I want it to. If I try the controls created in the repeater the do not call my events. I'll cut out as much as I can to make a somewhat simple code sample below.
Partial User Control .ascx.cs file:
public event EventHandler UserControlUploadButtonClicked;
private void OnUserControlUploadButtonClick()
{
if (UserControlUploadButtonClicked != null)
{
//Makes it to this line if control is created outside repeater
//controls created in repeater are null so this line not executed
UserControlUploadButtonClicked(this, EventArgs.Empty);
}
}
protected void TheButton_Click(object sender, EventArgs e)
{
// .... do stuff then fire off the event
OnUserControlUploadButtonClick();
}
The markup of the user control that matters:
<asp:ImageButton runat="server" ID="imbUploadFile" ImageUrl="~/images/status_red.png" ToolTip="Upload File" onclick="TheButton_Click" />
Here is the .aspx.cs part that works if I call it on Page_Load:
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
LoadDDLs();\\Load drop down lists for filter for other UI stuff
}
\\This works!
this.ucTest.UserControlUploadButtonClicked += new EventHandler(ManageUploader);
}
This is what I am trying in the binding of the repeater that is not working:
protected void rptMonthlyFiles_ItemDataBound(Object Sender, RepeaterItemEventArgs e)
{
if (e.Item.ItemType == ListItemType.Item || e.Item.ItemType == ListItemType.AlternatingItem)
{
DataRowView drv = e.Item.DataItem as DataRowView;
//there are one of these for each month cut the rest out to make smaller code sample
//Below gets DB info and sets up user control properly for UI based on business rules
((NRTWebApplication.UserControls.ucMonthlyFile2)e.Item.FindControl("ucOctMonthlyFile")).GetFileInfo();
// This is how I am adding the event handler for each user control and it does not work like if done in Page_Load
((NRTWebApplication.UserControls.ucMonthlyFile2)e.Item.FindControl("ucOctMonthlyFile")).UserControlUploadButtonClicked += new EventHandler(ManageUploader);
}
}
This is the place holder for what the parent page .aspx should do when the event is raised by clicking the User Control:
private void ManageUploader(object sender, EventArgs e)
{
// ... do something when event is fired
this.labTest.Text = "After User Control Button Clicked";
}
Stuck on this for a while any and all help greatly appreciated!
Take a look at this ( https://msdn.microsoft.com/en-us/library/system.web.ui.webcontrols.repeater_events(v=vs.110).aspx ) to get an understanding of the Repeater's Event Life Cycle. Basically you need to wire a Web User Control's events at the time of the repeater items creation, not when it is being bound, which obviously happens after creation. The following code should work for you:
protected void rptMonthlyFiles_ItemCreated(Object Sender, RepeaterItemEventArgs e)
{
if (e.Item.ItemType == ListItemType.Item || e.Item.ItemType == ListItemType.AlternatingItem)
{
DataRowView drv = e.Item.DataItem as DataRowView;
//there are one of these for each month cut the rest out to make smaller code sample
//Below gets DB info and sets up user control properly for UI based on business rules
((NRTWebApplication.UserControls.ucMonthlyFile2)e.Item.FindControl("ucOctMonthlyFile")).GetFileInfo();
// This is how I am adding the event handler for each user control and it does not work like if done in Page_Load
((NRTWebApplication.UserControls.ucMonthlyFile2)e.Item.FindControl("ucOctMonthlyFile")).UserControlUploadButtonClicked += new EventHandler(ManageUploader);
}
}
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