asp.net databinding string is passed to function but runtime occurs

Question

I'm using a code-behind function (called TestFx) in my binding expression. I'm passing a string and the function accepts a string but I still get a runtime error saying invalid args.

But if I change the method to accept an object and inspect the value, "it's a string!" Can someone please explain?

-rod

   ProductDescription:
                <asp:Label ID="ProductDescriptionLabel" runat="server" 
                    Text='<%# TestFx(Eval("ProductDescription")) %>' />
                <br />

Andrew Florko · Accepted Answer · 2010-05-22 19:33:06Z

1

Another option is to handle repeater control ItemDataBound event. It's more suitable if ItemTemplate elements require complex decoration

answered May 22, 2010 at 19:33

Andrew Florko

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Comments

wsanville · Accepted Answer · 2010-05-22 19:25:31Z

0

The return type of Eval is object. As you've noticed, you can either change the signature of your method to accept an object, or you can typecast the result of Eval("ProductDescription") to a string:

<asp:Label ID="ProductDescriptionLabel" runat="server" 
                    Text='<%# TestFx(Eval("ProductDescription").ToString()) %>' />

answered May 22, 2010 at 19:25

wsanville

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1 Comment

Roman Over a year ago

or if you know for a fact the item will be a string you can just cast it instead of calling ToString

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