asp.net mvc - What are the rules for nesting @'s in Razor syntax? -



asp.net mvc - What are the rules for nesting @'s in Razor syntax? -

i've started razor (v3) , it's fine, don't understand rules behind when need utilize @ sign.

here illustration current project.

in code:

@if (viewbag.forcepublic == null && user.identity.getuserid() == @model.seller.id) { <h2>listing status</h2> switch (model.status) {

if set @ in front end of switch statement, runtime error saying don't need nest @ signs.

however, in code:

@if(!model.bizaddress.streetaddress.isempty()) { @html.displayfor(model => model.bizaddress.streetaddress); }

not not syntax error (as 1 expect, considering illustration above), if don't include @ sign in front end of html.displayfor, streetaddress not printed. instead silently fails!

i understand why happening can avoid subtle bugs might cause in future.

i suspect root cause has fact templating (i think) analogous preprocessor step, , scoping of c# code known @ runtime, these 2 examples structurally same after both steps take place (preprocess, compile , run).

@ in razor used 2 different purposes:

1- denote start of code block razor using @ character. <% %> in web forms.

2- inline expressions (variables , functions) start @ (for writing content on page). <%: %> or <% response.write() %> in web forms.

in code, @ character before if denotes start of code block. end of block end } of if block. don't need , not allowed utilize @ in between. but, @ before html.displayfor() used inline expression. in fact, should not set semi-colon @ end of line, otherwise semi-colon displayed after display name on page.

look @ quick reference more details.

asp.net-mvc razor

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