How to access application setting through markup using expression?

In a repeater control I've Eval binding as:

<%#Eval("PubDate", "{0:dd-MMM-yyyy}")%>

But date time format needs to be configurable from the web.config. I want to access datetime format from web.config in markup like:

<%#Eval("PubDate", "{0:<%$ AppSettings: DateTimeFormat %>}")%>

But is is not working... Any suggesio开发者_开发知识库ns?

You can create a property on your page in code behind (e.g. AppDateTimeFormat) which accesses DateTimeFormat from the AppSettings and use it like this:

    <%#Eval("PubDate", AppDateTimeFormat)%>

Try this one:

<%# Eval("PubDate", "{0:" + ConfigurationManager.AppSettings["DateTimeFormat"] + "}")%>

Edit: I'd recommend placing the parenthesis inside the String. Then you'd be able to use

<%# Eval("PubDate", ConfigurationManager.AppSettings["DateTimeFormat"])%>