Conditional ASP.NET MVC razor sections

Question

I want to define this section only if some property (Model.ReadOnly) is false.

@section toolbar {
    <div class="tool">
        <div class="row">
            @Html.ActionLink( Resources.Strings.Edit, "Edit", "Profile" )
        </div>
        <div class="row">
            @Html.ActionLink( Resources.Strings.Delete, "Delete", "Profile" )
        </div>
    </div >
}

I tried wrapping it up in @if ( !Model.ReadOnly ) {} but it doesn't work.

Is there a way to do this?

I do not want to define an empty section (as @itsmatt suggests), the layout of my page changes whether the section is defined or not (using IsSectionDefined( "toolbar" )).

You should just have to throw `` and `` tags around the section declaration. See my answer. — Charlino, Aug 17 '11 at 18:19
My solution: https://gist.github.com/brynner/7de01fb7446bddd9116847323d18b10d — Brynner Ferreira, Aug 23 '18 at 22:43

score 44 · Accepted Answer · answered Aug 17 '11 at 18:17

44

This should work.

@if (!Model.ReadOnly)
{
    <text>
    @section toolbar {

    }
    </text>
}

I never said it would be pretty ;-)

answered Aug 17 '11 at 18:17

Charlino

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In my case i didn't need the tags – Rasmus Jan 13 '16 at 15:24
I can confirm that I also didn't need this `` tags (ASP.NET MVC v5.2.7). – Mariusz Pawelski May 17 '21 at 12:31

score 4 · Answer 2 · edited Apr 22 '15 at 14:32

4

This works for me:

@section SomeSection {
   @if (!Model.ReadOnly)
   {

   }
}

Essentially flipping where the conditional is. This essentially results in an empty section if Model.ReadOnly is true.

Update:

So, what about moving that section to a PartialView and doing something like:

@Html.Partial("MyAction")

in your View and then let the MyAction return you the appropriate PartialView based on the ReadOnly value? Something like:

public PartialViewResult MyAction()
{
   ...

   // determine readonly status - could have passed this to the action I suppose    
   if (ReadOnly)
   {
      return PartialView("TheOneThatDefinesTheSection");
   }
   else
   {
      return PartialView("TheOneThatDoesNotDefineTheSection");
   }
}

Seems like that would work just fine.

edited Apr 22 '15 at 14:32

Ian Kemp

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answered Aug 17 '11 at 18:02

itsmatt

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No, it wouldn't work for me. I'm doing some logic wether the section is defined or not. – Bertrand Marron Aug 17 '11 at 18:03
OK, so I added another idea in my answer which worked in my test example just fine. Maybe it would work for you. – itsmatt Aug 17 '11 at 18:16

score 0 · Answer 3 · edited May 23 '17 at 11:52

0

Bertrand,

See:

Razor If/Else conditional operator syntax

basically (para-phrasing), ... Razor currently supports a subset of C# expressions without using @() and unfortunately, ternary operators are not part of that set.

also, this may be a way around the issue:

conditional logic in mvc view vs htmlhelper vs action

basically, use the if logic to call a partialview to satisfy your criteria.

[edit] this was my basic thinking (where your @section code is defined in that partial):

@if(!Model.ReadOnly) 
{
    @Html.Partial("toolbar")
}

edited May 23 '17 at 11:52

Community

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1

answered Aug 17 '11 at 17:54

jim tollan

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I don't think you understood me. I'm not asking how `if` statements work. I'm trying to define a section **only** if a condition is verified. I don't know where you got that I want to use a ternary operator. – Bertrand Marron Aug 17 '11 at 18:00
ok -no worries, just covering all the bases. i still 'think' my idea of defining the toolbar @section in a partial view and then checking that may work (or not!!)... [see my clumsy edit] :) – jim tollan Aug 17 '11 at 18:11

Conditional ASP.NET MVC razor sections

3 Answers3

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