c# - Editing a variable length list. View Model IEnumerable<> property is comming null from post method -

i need edit variable length list, i've followed steven sanderson's blog , ivan zlatev's blog , comes this. model:

public class tagviewmodel {     [required]     [stringlength(200)]     [datatype(datatype.text)]     [display(name = "Тип")]     public string name { get; set; }      [required]     [stringlength(200)]     [datatype(datatype.text)]     [display(name = "Значение")]     public string value { get; set; }      [hiddeninput(displayvalue = false)]     public long id { get; set; }      [hiddeninput(displayvalue = false)]     public long owner { get; set; }      [hiddeninput(displayvalue = false)]     public spectreenodetype ownertype { get; set; } } 

view:

@model ienumerable<security.models.tagviewmodel>  @{     viewbag.title = "tag editor"; }  <h2>tag editor</h2>  @using(html.beginform("edittags", "treeview", formmethod.post)) {     <div id="editorrows">                     @for (int = 0; < model.count(); i++)         {                     html.renderpartial("_partialtageditor", model.elementat(i));                     }     </div>     @html.actionlink("add tag", "addtag", null, new { id = "additem" });     <input type="submit" value="save changes" /> }  <script>     $("#editorrows").on("click", "a.deleterow", function () {                 $(this).closest("div.editorrow").remove();             });      $("#additem").click(function () {         $.ajax({             url: this.href,             cache: false,             success: function (html) { $("#editorrows").append(html); }         });         return false;     }); </script> 

partial view:

@model security.models.tagviewmodel  <div class="editorrow">     @using (html.begincollectionitem("tagviewmodel"))     {         @html.labelfor(x => x.name)         @html.textboxfor(x => x.name)         @html.labelfor(x => x.value)         @html.textboxfor(x => x.value)         @html.editorfor(x => x.id)         @html.editorfor(x => x.owner)         @html.editorfor(x => x.ownertype)                 <a href="#" class="deleterow">delete</a>     } </div> 

post action method:

[httppost] public actionresult edittags(ienumerable<tagviewmodel> taglist) {     return view("index"); } 

fiddler shows, edittags post request contains required data:

tagviewmodel.index  c1ec8d7c-cfc9-4cdc-b32c-6446d4bb476c tagviewmodel[c1ec8d7c-cfc9-4cdc-b32c-6446d4bb476c].name length tagviewmodel[c1ec8d7c-cfc9-4cdc-b32c-6446d4bb476c].value    100 - 200 tagviewmodel[c1ec8d7c-cfc9-4cdc-b32c-6446d4bb476c].id   1 tagviewmodel[c1ec8d7c-cfc9-4cdc-b32c-6446d4bb476c].owner    3 tagviewmodel[c1ec8d7c-cfc9-4cdc-b32c-6446d4bb476c].ownertype    value tagviewmodel.index  9fad7d46-f6f6-4cd7-80be-41e1b5011670 tagviewmodel[9fad7d46-f6f6-4cd7-80be-41e1b5011670].name width tagviewmodel[9fad7d46-f6f6-4cd7-80be-41e1b5011670].value    10 - 20 tagviewmodel[9fad7d46-f6f6-4cd7-80be-41e1b5011670].id   2 tagviewmodel[9fad7d46-f6f6-4cd7-80be-41e1b5011670].owner    3 tagviewmodel[9fad7d46-f6f6-4cd7-80be-41e1b5011670].ownertype    value tagviewmodel.index  30048799-116c-4eba-9010-580c681e6a5b tagviewmodel[30048799-116c-4eba-9010-580c681e6a5b].name wqe tagviewmodel[30048799-116c-4eba-9010-580c681e6a5b].value    qwe tagviewmodel[30048799-116c-4eba-9010-580c681e6a5b].id   0 tagviewmodel[30048799-116c-4eba-9010-580c681e6a5b].owner    0 tagviewmodel[30048799-116c-4eba-9010-580c681e6a5b].ownertype    value 

but in controllers's edittags action method taglist null. i'm stuck , have no idea how solve problem.

i see reused lot of code blog post. have 1 small error. when use steven's custom helper provide wrong name it:

@using (html.begincollectionitem("tagviewmodel")) 

but should be:

@using (html.begincollectionitem("taglist")) 

because edittags action has parameter named taglist.

you can post collection part of main model. model might that:

public class indexviewmodel {     public ienumerable<tagviewmodel> tags { get; set; } } 

and partial view:

@using (html.begincollectionitem("tags"))