@section in foreach RSS

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  cgs120

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  @section in foreach

  Jun 23, 2011 05:09 PM|LINK

  How can use

  @section section_name{
  }

  in foreach loop ???

   

  here is simple example of what i would like to do:

  @foreach (var row in widgets)

  {

  var sectionName = row.sName;

          @section sectionName{

  　                 }

      }

    }

   

  and the error:

  Unexpected "section" keyword after "@" character.  Once inside code, you do not need to prefix constructs like "section" with "@". 

   

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  Mikesdotnett...

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  Re: @section in foreach

  Jun 23, 2011 07:17 PM|LINK

  Sections aren't supposed to be generated dynamically like that. What are you trying to do? If you want to render a section within the loop, you need to use RenderSection.

  Regards, Mike
  Beginning ASP.NET Web Pages with WebMatrix | My Site | Twitter
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  cgs120

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  56 Posts

  Re: @section in foreach

  Jun 23, 2011 09:22 PM|LINK

  OK here is what i have :

  in _SiteLayout.cshtml page:

  @RenderSection("rcHeader",false)
                  @RenderSection("rcTop",false)
                  @RenderSection("rcLeft",false)
                  @RenderBody()
                  @RenderSection("rcRight",false)
                  @RenderSection("rcBottom",false)
                  @RenderSection("rcFooter",false)

   now in content page default.cshtml i pull data about widgets from db. i want to do foreach and fill all this sections with content. For now i did it like that:

  @section rcHeader{
  @foreach (var row in widgets)
  {
       if (row.sName == "rcHeader")
      {
          @RenderPage("~/Templates/_" + row.wFile + ".cshtml", row);
      }
  }
  }

  @section rcTop{
  @foreach (var row in widgets)
  {
       if (row.sName == "rcTop")
      {
          @RenderPage("~/Templates/_" + row.wFile + ".cshtml", row);
      }
  }
  }

  but that way i have to repeat the same code for all sections, so that is why i wanted to loop thru all sections like in oryginal post and then do another loop thru rows that will call @RednerPage

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  cgs120

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  Re: @section in foreach

  Jun 27, 2011 01:26 PM|LINK

  Any suggestions how to do this better ?

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  cgs120

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  103 Points

  56 Posts

  Re: @section in foreach

  Jun 30, 2011 03:55 PM|LINK

  Mikesdotnetting

  Sections aren't supposed to be generated dynamically like that

  My section are defined in _layout page like @RenderSection("section_name", false)

  Mikesdotnetting

  What are you trying to do?

  in content page i try to loop thru records from db and for every row i try to insert content of that row to specific section. there are many sections and every section can have multiple rows in db.

   

  Anyway THE BIG QUESTION IS : can i use @section section_name{} anywhere within the code ??? simple example:

  @if (condition_here) {
  @section section_name{}
  }

  will create error: Unexpected "section" keyword after "@" character.  Once inside code, you do not
  need to prefix constructs like "section" with "@".

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  XiaoCheng Fa...

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  Re: @section in foreach

  Jul 05, 2011 12:46 PM|LINK

  Hi,

  As far as I know, the block in @{} requires C# code and section is not part of reserved word, so you can not use section in it directly.

  You can try to look for section class of WebMatrix.

  I hope this can be helpful for you.

  Please mark the replies as answers if they help or unmark if not.
  If you have any feedback about my replies, please contact msdnmg@microsoft.com
  Microsoft One Code Framework
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  pranavkm

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  796 Points

  106 Posts

  Re: @section in foreach

  Jul 05, 2011 07:15 PM|LINK

  The problem with doing this -

  var mySection = "Foo";
  
  @section mySection {
  
  }

  is that the Razor parser thinks your section is named the literal "mySection". A @section block gets parsed as a call to DefineSection method. So you could effectively write:-

  @foreach (var item in widgets) {
     var row = item;
     var sectionName = row.sName;
     DefineSection{sectionName, () => {
         Write(RenderPage("~/Templates/_" + row.wFile + ".cshtml", row));
     });
  }
  

  This is not entirely nice because you cannot use Razor code inside the lambda (notice that I had to use the Write method instead of using "@" to print. You could work around this by declaring a template, but it doesn't look very elegant:-

  @foreach (var item in widgets) {
      var row = item; 
     DefineSection(row, () => {
        Func<object, HelperResult> content = @<text> 
  @RenderPage("~/Templates/_" + row.wFile + ".cshtml", row) 
  Write(content(null)); </text>; }); } 

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  cgs120

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  56 Posts

  Re: @section in foreach

  Jul 05, 2011 09:06 PM|LINK

  Thank you, here is what i use:

  @foreach (var item in widgets) {
     var row = item;
     var sectionName = row.sName;
     DefineSection(sectionName, () => {
         Write(RenderPage("~/Templates/_" + row.wFile + ".cshtml", row));
     });
  }

   

  "Cannot use a lambda expression as an argument to a dynamically dispatched operation without first casting it to a delegate or expression tree type"

   

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  pranavkm

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  106 Posts

  Re: @section in foreach

  Jul 05, 2011 09:46 PM|LINK

  I'm not sure if there's a better way of dealing with this, but casting should resolve this.

  @foreach (var widget in widgets) { 
     var row = widget; 
     var sectionName = (string)row.sName;
     var wFile = (string)row.wFile;
  
     DefineSection(sectionName, () => { 
         Write(RenderPage("~/Templates/_" + wFile + ".cshtml", row)); 
     }); 
  }
  
  

  Also if you intend on using row in the sub-page being called, cast it to DynamicRecord first.

  var row = (DynamicRecord)PageData[0];
  

  • Marked as answer by cgs120 on Jul 05, 2011 10:01 PM
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  cgs120

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  103 Points

  56 Posts

  Re: @section in foreach

  Jul 05, 2011 10:06 PM|LINK

  Perfect - thank you so much for your help. It will make my code so much shorter and easier to read/ change.

  I'm very new to C# , so things like that are not so easy for me :) but i'm reading ...