I’ve programmed in both classic ASP and ASP.NET, and I see different tags inside of the markup for server side code.
I’ve recently come across a good blog on MSDN that goes over the difference between:
<%=(percentage together with equals sign) and<%#(percent sign and hash/pound/octothorpe)
(<%# is evaluated only at databind, and <%= is evaluated at render), but I also see:
<%$(percent and dollar sign) and<%@(percent sign and at symbol).
I believe <%@ loads things like assemblies and perhaps <%$ loads things from config files? I’m not too sure.
I was just wondering if anyone could clarify all of this for me and possibly explain why it’s important to create so many different tags that seemingly have a similar purpose?
Answers:
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Method 1
<% %>– is for inline code (especially logic flow)<%$ %>– is for evaluating expressions (like resource variables)<%@ %>– is for Page directives, registering assemblies, importing namespaces, etc.<%= %>– is short-hand forResponse.Write(discussed here)<%# %>– is used for data binding expressions.<%: %>– is short-hand for Response.Write(Server.HTMLEncode()) ASP.net 4.0+<%#: %>– is used for data binding expressions and is automatically HTMLEncoded.<%-- --%>– is for server-side comments
Method 2
You’ve covered 2 of them (<%# is evaluated only at databind, and <%= is evaluated at render), and the answer for “<%@” is that it’s compiler directives (ie., stuff like what you’d put on a compiler’s command line).
I don’t know about “<%$“.
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