Forms Data Controls :: Invoking A Handler With A Parameter In Its Query String
Mar 22, 2010
I'm having troubles passing a parameter to a handler in it's query string. I have a gridview with an image column, this column is defined as a TemplateField, as:
<asp:TemplateField
HeaderText="Image">
<ItemTemplate>
<asp:Image
ID="Image1"
runat="server" ImageUrl='~/ImageHandler.ashx?ID=<%# Eval("EmployeeID")%>'
/>
</ItemTemplate>
</asp:TemplateField>
As you can see, the ImageUrl is a call to a handler that receives the EmployeeID in the QueryString, under the name ID. When I run it, the ImageHandler method receives the following query string "ID=<%" instead of "ID=<the result of Eval("EmployeeID")>", and of course, it throws a FormatException when using it as an int to get the EmployeeID. (If I type ImageUrl="~/ImageHandler.ashx?ID=<%# Eval("EmployeeID")%>" (using " instead of ') the compiler returns the error incorrect server tag) The complete markup is:
<asp:SqlDataSource
ID="SqlDataSource1"
runat="server"
ConnectionString="<%$ ConnectionStrings:NorthwindConnectionString %>"
SelectCommand="SELECT [EmployeeID], [LastName], [FirstName], [Photo] FROM [Employees]">
</asp:SqlDataSource>
<asp:GridView
ID="GridView1"
runat="server" DataSourceID="SqlDataSource1"
AutoGenerateColumns="False">
<Columns>
<asp:BoundField
DataField="EmployeeID"
HeaderText="ID" SortExpression="EmployeeID"
/>
<asp:BoundField
DataField="FirstName"
HeaderText="FirstName"
SortExpression="FirstName"
/>
<asp:BoundField
DataField="LastName"
HeaderText="LastName" SortExpression="LastName"
/>
<asp:TemplateField
HeaderText="Image">
<ItemTemplate>
<asp:Image
ID="Image1"
runat="server" ImageUrl='~/ImageHandler.ashx?ID=<%# Eval("EmployeeID")%>'
/>
</ItemTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView>
Could anybody tell me what am I missing here?
Rafael
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