c# - MVC.NET the ViewModel from Create POST is always null -
in mvc.net project used scaffolding templates. ther binded 1 dto model. decided wanted link viewmodel, because have 2 multiselects need use pass values. how viewmodel looks:
public class createquestionmodel { public question question { get; set; } public list<int> politicianids { get; set; } public list<int> topicids { get; set; } } my create post method getting viewmodel view:
[httppost] [validateantiforgerytoken] [authorize(roles = "regular")] public actionresult create(createquestionmodel question) { if (modelstate.isvalid) { int id = websecurity.currentuserid; manager.createquestion(question.question, id, question.politicianids, question.topicids); return redirecttoaction("index"); } return view(question); } and create.cshtml looks this:
@model politicionline.models.createquestionmodel @{ viewbag.title = "stel een vraag!"; } <head> <link rel="stylesheet" href="~/content/questions.css" type="text/css" /> @scripts.render("~/bundles/jquery") @scripts.render("~/bundles/jqueryval") <script src="@url.content("~/scripts/extra/chosen/chosen.jquery.min.js")" type="text/javascript"></script> <link rel="stylesheet" href="@url.content("~/scripts/extra/chosen/chosen.min.css")" type="text/css"> <script src="@url.content("~/scripts/extra/select2-3.4.6/select2.min.js")" type="text/javascript"></script> <link rel="stylesheet" href="@url.content("~/scripts/extra/select2-3.4.6/select2.css")" type="text/css"> </head> <h2>stel een vraag!</h2> @using (html.beginform()) { @html.antiforgerytoken() @html.validationsummary(true) <fieldset> <legend>vraag</legend> <div class="general-question"> <div class="editor-label"> @html.labelfor(model => model.question.generalquestion, "algemene vraag") </div> <div class="editor-field"> @html.textbox("question.generalquestion", new { @class = "general-question-edit" }) @html.validationmessagefor(model => model.question.generalquestion) </div> </div> <div id="geadresseerde-politici"> @html.labelfor(model => model.politicianids, "geadresseerde politicians:") @html.listbox("politicianids", (multiselectlist)viewbag.politicians, new { @id = "poldrop" }) </div> <div class="editor-label"> @html.labelfor(model => model.question.explanation, "extra uitleg") </div> <div class="editor-field"> @html.textarea("question.explanation", new { @class = "explanation-textarea-edit" }) @html.validationmessagefor(model => model.question.explanation) </div> <div> @html.labelfor(model => model.topicids, "kies je thema's (maximum 2):") @html.listbox("topicids", (multiselectlist)viewbag.topics, new { @id = "select2select", @style = "width: 500px"}) </div> <p> <input type="submit" value="indienen!" /> </p> </fieldset> } <div> @html.actionlink("back list", "index") </div> <script type="text/javascript"> function format(topic) { if (topic.css == 'optiongroup') { return "<b>" + topic.text + "</b>"; } else { return "<i> " + topic.text + "<i>"; } } $("#select2select").select2({ placeholder: "selecteer een thema...", maximumselectionsize: 2, formatresult: format, escapemarkup: function(m) { return m; } }); </script> the <script> section @ bottom doesn't matter pasted anyway, i'm using jquery plugin select2 listbox.
this way of binding textboxes , such viewmodel properties, found on stackoverflow. tried classic way using @html.editorfor , @htmllistboxfor viewmodel's properties null.
what doing wrong/ overlooking?
edit: put constructor in viewmodel, viewmodel (createquestionmodel) not null anymore, values still default values (not ones form). viewmodel looks like:
public class createquestionmodel { public question question { get; set; } public list<int> politicianids { get; set; } public list<int> topicids { get; set; } public createquestionmodel() { question = new question(); politicianids = new list<int>(); topicids = new list<int>(); } } solution commenter yoeri provided solution, can see below in answer on question!
okay guys, found out doing wrong. made extremely stupid mistake, can't believe i've been struggling 2 days now.
the signature of create post method was:
public actionresult create(createquestionmodel question) { ... } it should be:
public actionresult create(createquestionmodel createquestionmodel) { ... } i had change parameter form createquestionmodel question createquestionmodel createquestionmodel, simple that, works.
update yoeri understand why giving problems in first place:
initially named parameter createquestionmodel question, didn't work because have model class named question. parameter name has either name of model using in create view, or other name long it's not name of model class!
thanks yoeri!
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