c# - @Html.DisplayFor() is not working with custom model sub-class -

so have mvc application manage list of sites , on details view none of sub classes within model render though @html.displaynamefor rendering label correctly.

here view code working fine:

<tr>     <td>         <span class="label label-info">@html.displaynamefor(model => model.sitename)</span>     </td>      <td style="text-align: center;">         @html.displayfor(model => model.sitename)     </td> </tr> 

this code displayfor generates nothing:

<tr>     <td>         <span class="label label-info">@html.displaynamefor(model => model.version.versionname)</span>     </td>      <td style="text-align: center;">         @html.displayfor(model => model.version.versionname)     </td> </tr> 

here site model:

public class site {     public int id { get; set; }      [required]     [display(name = "link")]     [datatype(datatype.url)]     public string sitelink { get; set; }      [required]     [display(name = "name")]     public string sitename { get; set; }      public int versionid { get; set; }      [foreignkey("versionid")]     public version version { get; set; } } 

and version class:

public class version {     public int id { get; set; }      [display(name = "version")]     public string versionname { get; set; }      public list<site> sites { get; set; } } 

lastly, here details actionresult method in controller:

public actionresult details(int id = 0) {     site site = db.sites.find(id);     if (site == null)     {         return httpnotfound();     }     return view(site); } 

all of other views rendering fine, details view seems returning nothing custom classes.

you need explicitly load child (version):

site site = db.sites.find(id); if (site == null) {     return httpnotfound(); } db.entry(site).reference(p => p.version).load();  return view(site); 

you

db.sites.include(s => s.version).firstordefault(s => s.id == id); 

https://msdn.microsoft.com/en-us/data/jj574232.aspx#explicit