ASP.NET Repeater question

Question

I have a repeater control and under the ItemTemplate, I have Image control. Anyway the old

How can I set the ImageUrl programatically?

Anyway, the old html code I have was like this:

<ItemTemplate>
   <img src="<%# Eval("ImageSource") %>" alt="" />
</ItemTemplate>

But I want to check if the image exists in directory or not then I can setup with temp image.

I have a code but .. it's not really working so there's no sense of showing it here. Can you guys help me? Should I use ItemCreated or ItemDataBound event?

Answer 1

In the xml side in the template, you need to call a method directly.

<asp:Image runat="server" ID="myImg" ImageUrl='<%# MyImageUrlFunction(Eval("DataFieldName").ToString()); %>' />

You need a corresponding method in the code behind defined publicly:

public string MyImageUrlFunction(string field) 
{
    // put some logic here to determine url
    return imageUrl;
}

Answer 2

In your ItemDataBound, do something like:

protected void rpt_ItemDataBound(object sender, RepeaterEventArgs e)
{
    HtmlImage img = (HtmlImage)e.Item.FindControl("img");

    string imageUrl = (string)DataBinder.Eval(e.Item.DataItem, "ImageSource");
    if (File.Exists(imageUrl))
        img.Src = imageUrl;
}

That's System.Web.UI.HtmlControls.HtmlImage, System.Web.UI.DataBinder and System.IO.File.

Answer 3

ItemDataBound. You can get the control reference through the current item's findcontrol event, and then check to see that the image exists. You can get the file path using Server.MapPath("~/images/test.png"), and then if it doesn't, inject your own.

You can also use a public method that the client-side markup can call, pass in the URL, and provide a default if it doesn't exist.

HTH.

Answer 4

<ItemTemplate>
    <asp:Image ImageUrl='<%# System.IO.File.Exists(Eval("ImageSourceProperty").ToString()) ? Eval("ImageSourceProperty").ToString() : TemporaryImagePath %>' runat="server" />
</ItemTemplate>

Answer 5

for the Error

The server tag is not well formed

You should remove extra space in your code!

<%# System.IO.File......%>
should be <%#System.IO.File......%>