Use to c# in html to perform if statement

问题

I've previously seen answers on Stackoverflow that involve using 'the c# construct' to essentially perform an 'if' statement in the html of a asp.net page.

So imagine i want to display Eval("option1") if its not null OR Eval("option2") if option 1 is null. How do i do this???

Hope that makes sense....

Many Thanks!!!!

回答1:

You don't need if statement for it. Just use

<%= Eval("option1") ?? Eval("option2") %>

回答2:

Is this the "if" semantics you are looking for?

<% if (condition == true) { %>
  Show something
<% } else { %>
  Show something else
<%} %>

来源：https://stackoverflow.com/questions/5169665/use-to-c-sharp-in-html-to-perform-if-statement