C# ASP.NET MVC model binding

Question

in ASP.NET MVC i was trying to bind a model field with displayText with code below:

<%    if (Model.WillAttend == true)
           Html.DisplayTextFor(x => x.Name);   %>

but when i tried:

<%    if (Model.WillAttend == true)     %>  
         <% = Html.DisplayTextFor(x => x.Name)     %>

it is working, why? both seems same code, the only different is in below one is just each line is separated with the server side tag.

Johny Skovdal · Accepted Answer · 2013-07-05 12:02:19Z

2

The difference is in the = sign after the open tag <%. This ensures that the value is written to the output. The first example is simply declaring a value and not doing anything with it.

Check out this blog entry for more info on the ASPX view engine tag syntax.

This is simplified a lot with Razor syntax, where you are able to just prefix a line in a codeblock with @ in order to write it to output. I don't know if there is a similar functionality in the ASPX view engine though.

edited Jul 5, 2013 at 12:02

answered Jul 5, 2013 at 7:49

Johny Skovdal

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5 Comments

AKD Over a year ago

so u mean we cant write all the c# code within a single server side tag (<% %>) ?

Johny Skovdal Over a year ago

Not a single one no, not that I can find at least (I've only really worked with the Razor syntax). Code that you want to output needs some way of writing it to the output, hence the <%= syntax.

Johny Skovdal Over a year ago

You can declare a string though, and just output that in the end, but I'm not sure that would be easily readable.

user887983 Over a year ago

there is no "classic" MVC, there are different View Engines. codeproject.com/Articles/467850/ASP-NET-MVC-view-engines

Johny Skovdal Over a year ago

@RobertP. ASPX, that's the word i was looking for. Thanks. :)

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