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How to use c# code inside <% ... %> tags on asp.net page?

Answer 1

A:

Try this (example as link): <a href='<%=FurtherReadingPage %>?id=<%# Eval("Id") %>'>My link</a>

Sergio 2009-07-21 10:44:12

This mixes <%= and <%#, which will create problems in most circumstances. <%= won't work inside a Repeater and <%# won't work unless DataBind() is called.

Keith 2009-07-22 08:58:59

@Keith: You are wrong. I just tried <%= "Test" %> inside a repeater to double check and it works ok. <%# only works with Databind() which is the case.

Sergio 2009-07-22 09:10:40

Sorry, yes, <%= can work in repeaters, depending on the control hierarchy above not containing any collection style controls. Basically <%= FurtherReadingPage %> will sometimes work in a repeater, while <%# FurtherReadingPage %> always will.

Keith 2009-07-22 10:19:03

Answer 2

+1 A:

Try this:

<%#String.Format("{0}?id={1}",FurtherReadingPage, Id)%>

Saul Dolgin 2009-07-21 10:46:46

Answer 3

+2 A:

You can do it like this -

<asp:Hyperlink runat="Server" ID="hlLink" NavigateUrl='<%# FurtherReadingPage + "?Id=" + DataBinder.Eval(Container.DataItem, "Id")  %>' />

Kirtan 2009-07-21 10:47:25

Answer 4

+2 A:

You have a couple of different tags:

<% executes the code inside:

<% int id = int.Parse(Request["id"]); %>

<%= writes out the code inside:

<%=id %> <!-- note no ; -->

<!-- this is shorthand for: -->
<% Response.Write(id); %>

Both of these break up the normal flow when rendered on a page, for instance if you use them in a normal Asp.net <head runat="server"> you'll get problems.

<%# databinding:

<%# Eval("id") %>

This allows you to specify the bindings for controls that Asp.net WebForms render as a collection (rather than the literal controls that you can use <%= with), for instance:

<!-- this could be inside a repeater or another control -->
<asp:Hyperlink runat="server" ID="demo" 
     NavigateUrl="page.aspx?id=<%# Eval("id") %>" />

<%  //without this bind the <%# will be ignored
    void Page_Load( object sender, EventArgs e ) {
        demo.DataBind(); 
        //or
        repeaterWithManyLinks.DataBind(); 
    } 
%>

For your specific case you either:

Use a repeater and <%# Eval(...) %> with repeater.DataBind();

or

Use a foreach loop (<% foreach(... %>) with <%= ... %>

Keith 2009-07-21 10:57:13

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How to use c# code inside <% ... %> tags on asp.net page?

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