Image caching in GridTemplateColumn

1 posts, 0 answers
  1. Andrea
    Andrea avatar
    64 posts
    Member since:
    Jan 2005

    Posted 19 Feb 2008 Link to this post

    Hi all,
    i'm facing with images behaviour in GridTemplateColumns.

    I have a grid with two GridTemplateColumns, first with an image object and second with a panel object.

    image ImageUrl parameter is set in grid ItemDataBound event, and it points to a custom HttpHandler which downloads an image from my database and renders it on the browser.

    Unfortunately, when i change grid datasource, image ImageUrl is programmatically set to the right new imageUrl, while the grid renders the previous image. If i inspect the image url, it really points to previous url, instead of new one.

    I tried yet to expire and disable cache of my page, but it still doesn't work.

    here is my grid
    <telerik:RadGrid ID="RadGrid1" runat="server" > 
        <MasterTableView DataKeyNames="ID_N" AutoGenerateColumns="false" ShowHeader="true">  
                       <asp:Image ID="Image1" runat="server" CssClass="AssetImage"  /> 
                <telerik:GridTemplateColumn > 
                        <asp:Panel runat="server" ID="Panel1"></asp:Panel> 

    and here is the ItemDataBound handler
    Private Sub RadGrid1_ItemDataBound(ByVal sender As Object, ByVal e As Telerik.Web.UI.GridItemEventArgs) Handles RadGrid1.ItemDataBound  
      If e.Item.ItemType = Telerik.Web.UI.GridItemType.Item OrElse e.Item.ItemType = Telerik.Web.UI.GridItemType.AlternatingItem Then  
                Dim GDI As Telerik.Web.UI.GridDataItem = DirectCast(e.Item, Telerik.Web.UI.GridDataItem)  
                Dim DRV As DataRowView = DirectCast(GDI.DataItem, DataRowView)  
                Dim img As Image = DirectCast(GDI.FindControl("Image1"), Image)  
                img.ImageUrl = String.Format("assetimg.ashx?IDN={0}&BH=100&BW=100&CAT={1}", DRV("ID_N"), Me.Category)  
     End If  
    End Sub 
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