Loading User Control In A Repeater?

Mar 23, 2010

I have a Repeater control that loads instances of a custom control I have built. This repeater looks like this:

<asp:Repeater ID="myRepeater" runat="server" OnLoad="myRepeater_Load">
<HeaderTemplate>
<table border="0" cellpadding="0" cellspacing="0">
</HeaderTemplate>
<ItemTemplate>
<tr><td><my:CustomControl ID="myControl" runat="server"
OnLoad="myControl_Load" />
</td></tr>
</ItemTemplate>
<FooterTemplate>
</table>
</FooterTemplate>
</asp:Repeater>

I bind to the Repeater through the myRepeater_Load event handler. My custom control is used to render an item within the Repeater. Because of this, I am trying to set properties on the custom control during the myControl_Load event handler. However, I do not know how to access the current item during the myControl_Load event.

Is there a way I can pass along the current item or access the current item during the myControl_Load event? If so, how?

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VS 2012 - Loading Images Into Repeater Control

Aug 19, 2013

I'm creating a simple CMS for a fairly simple web page. I'm currently working on a part for displaying news on the main page.

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- an Image control for displaying news cover picture,
- CKeditor control for editing news text,
- Repeater control for displaying pictures from database

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In Page_load I have the following:

vb.net Code:
connectionString = "Data Source=KORISNIK-PCSQLEXPRESS;Initial Catalog=****;
User ID=**;Password=****"        conn = New SqlConnection(connectionString)       
If conn.State = ConnectionState.Closed Or conn.State = ConnectionState.Broken Then             
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[Code] ...

As you can see, I load the GridView control with news from DB. At this moment all other control are disabled. User has to SELECT the row he wants to edit, and click the MODIFY button.

This is what happens when user clicks the MODIFY button:

vb.net Code:
Private Function selectForEdit()        dsSelectForEdit = New DataSet       
captionPicture.ImageUrl = ""         enableCommands()       
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[Code] ....

Basically, I select newsDetails based on newsID. Also, this is where I take the coverPicture from the database using a generic handler.

This is the code for showImage.ashx:

vb.net Code:
Sub ProcessRequest(ByVal context As HttpContext) Implements IHttpHandler.ProcessRequest        
Dim newsID As Int32        If Not context.Request.QueryString("newsID") Is Nothing Then           
newsID = Convert.ToInt32(context.Request.QueryString("newsID"))        Else           
Throw New ArgumentException("No parameter specified")        End If        

[Code] ....

This part works fine, as the picture is correctly displayed in the Image control. Now, I also want to load the pictures that are related to the selected news. So, I use this function:

vb.net Code:
Private Function selectNewsPictures()        dsSelectPicturesForEdit = New DataSet         enableCommands()       
Dim sqlQuery As String         sqlQuery = "SELECT newsDetailsPictureID,newsDetailsPicture,newsDetailsPictureCaption,newsDetailsPictureDescription FROM newsDetailsPictures WHERE newsID = @newsIDEditing"          myCommand = New SqlCommand(sqlQuery, conn)         myCommand.Parameters.Add("@newsIDEditing", SqlDbType.Int, 250)       

[Code] ....

You can see that I take pictureID's and store them into a List (of integer). That way I can use those integers in showNewsPictures.ashx to display all the pictures.

showNewsPictures.ashx:

vb.net Code:
Sub ProcessRequest(ByVal context As HttpContext) Implements IHttpHandler.ProcessRequest        
Dim newsID As Int32        If Not context.Request.QueryString("pictureID") Is Nothing Then           
newsID = Convert.ToInt32(context.Request.QueryString("pictureID"))        Else           
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[Code] ....

The picture ID's are being sent through pictureRepeater_ItemDataBound:

vb.net Code:
Private Sub pictureRepeater_ItemDataBound(sender As Object, e As RepeaterItemEventArgs)
Handles pictureRepeater.ItemDataBound        
If e.Item.ItemType = ListItemType.Item Or e.Item.ItemType = ListItemType.AlternatingItem Then            
Dim ctrl As New Image            ctrl = e.Item.FindControl("pictureHolder")           
ctrl.Width = 100            ctrl.Height = 100              ctrl.ImageUrl = "~/showNewsPictures.ashx?pictureID=" &
listOfIDs.Item(itemIndex)            itemIndex = itemIndex + 1         End If    End Sub

THE PROBLEM:

I load the page, select the news, click the MODIFY button and all works well. The news details are loaded, the cover picture is loaded, the repeater pictures are loaded.

I click the cancel button (clears all the commands and disables them) and I get an error saying the DataReader needs to be closed.And I never use one This happens either in showNewsPictures.ashx or showImage.ashx.

In some other scenario, this happens right after I click the MODIFY button.

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Edit: I have a working solution already - I would just like to know why my original attempt didn't work. My original attempt is the code below.

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....
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<td>
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<td>
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get;
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Code:

[code]....

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[code].....

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Psuedo-code for the issue below

Content page

[Code]....

Control

[Code]....

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[Code]....

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[Code]....

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[Code]....

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[code]....

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[code]...

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[Code]....

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I have written a user control that captures some user input and has a Save button to save it to the DB. I use a repeater to render a number of these controls on the page - imagine a list of multiple choice questions with a Save button by each question.

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[code]....

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