Problem with conditional databinding

Question

hi guyz.

i ve been strugling to find some way to do my required conditional binding, but i am lost :s

i want to use Eval("products_image") in conditional binding in such a way that if product_image exists in images directory then its ok, otherwise it should display "noimage.jpg"

i tried to do it this way:

<%# (File.Exists(("ProductImages/"+Convert.ToString(Eval("products_image"))))) ? ("ProductImages/"+Convert.ToString(Eval("products_image"))) : "ProductImages/noimage_small.jpg" ; %>

i have tried otherways as well, but every time, i mess up with a bunch of errors.

can any one guide me the right way to do this??

Answer 1

<%# (File.Exists(("ProductImages/"+Convert.ToString(Eval("products_image"))))) ? ("ProductImages/"+Convert.ToString(Eval("products_image"))) : "ProductImages/noimage_small.jpg" ; %>

Quite long and unreadable, isn't it?

I'd suggest adding a method to your code behind or in a <script> tag

// returns the imageFile parameter if the file exists, the defaultFile parameter otherwise
string ImageFileExists(string imageFile, string defaultFile) {
    if (File.Exists(Server.MapPath(imageFile)))
        return imageFile;
    else
        return defaultFile;
}

And then you'd simply use

<%# ImageFileExists("ProductImages/" + Eval("products_image").ToString(), "ProductImages/noimage_small.jpg") %>

Note that I've added a Server.MapPath call to the method so that File.Exists will actually look in the right place.

Answer 2

yes i did it.. Thanks Allah!!

i just moved the whole <script> tag and System.IO namespace inside the usercontrol .ascx file itself and it did it.

thanx a tones configurator for help :)