c# - Determine the type of an action method argument recieving data from strongly typed view -

i have following problem - developing asp.net mvc 3 application , have view typed. because of complexity of data model in view looks :

@model list<list<dataaccess.mcs_documentfields>[]> 

then render view :

@using (html.beginform("actionmethodname", "forms")) {     <table border="1">                 <tbody>                     @for (int = 0; < model.count(); i++)                     {                         if (model[i][0][0].contenttypeid == 1)                         {                             @html.partial("_partialheader", model[i])                         }                         else if (model[i][0][0].contenttypeid == 2)                         {                             @html.partial("_partialdrawing", model[i])                         }                         else if (model[i][0][0].contenttypeid == 3)                         {                             @html.partial("_partialbody", model[i])                         }                         else if (model[i][0][0].contenttypeid == 4)                         {                             @html.partial("_partialfooter", model[i])                         }                     }                 </tbody>             </table>             <button type="submit">save</button> } 

and 1 of partial views :

if (string.isnullorempty(item.fieldvalue))                     {                                                    <td colspan="2">                             @html.displayfor(y => y[i][0].questiontext)                             @html.hiddenfor(y => y[i][0].questiontext)                         </td>                                }                     else                     {                          <td colspan="2">                             @html.displayfor(y => y[i][0].questiontext)                             @html.hiddenfor(y => y[i][0].questiontext)                             :                             @html.displayfor(y => y[i][0].fieldvalue)                             @html.hiddenfor(y => y[i][0].fieldvalue)                         </td>                                } 

this snippet, want table has @ least 8-9 rows , each row has @html.hiddenfor expect data when i'm submiting form.

in controller have method :

[httppost] public actionresult actionmethodname(list<mcs_documentfields>[] collection) {     var test = collection;     list<mcs_documents> model = documentservice.all().tolist();     return view("index", model); } 

i tried lot of different types collection argument. of time null, @ best first 2 row (no idea why first two) nothing more. if use formcollection have submitted data, it's not related mcs_documentfields class in way.

i don't know i'm doing wrong. don't think type method should guessed think must determined , if there problem in code (most possibly in partial view) because i've posted here of main view, suggestions why logic not working , why can't bind data original type of model?

i suggest @ begincollectionitem package (http://nuget.org/packages/begincollectionitem/), allthough can see model complex (3 dimensions), sou you'll have nest them in nasty manner.

also should consider (due model complexity) creating custom model binder (http://www.codeproject.com/articles/605595/asp-net-mvc-custom-model-binder).

just 1 last remark - model in view differs model expect in action:

list<mcs_documentfields>[] collection != list<list<dataaccess.mcs_documentfields>[]>

ivan