javascript - Ajax query string not being posted to ASP.NET controller -

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i have ajax function:

updateficonfig: function ($appform) {      var valid = $appform.valid();     //if not valid validate plugin take care of errors     if (valid) {          $appform.serialize();         $.ajax({             url: '/identificonfig/defaultconfiguration/updateficonfig',             data: $appform,             datatype: 'application/json',             cache: false,             type: 'post',             success: function (data) {                 if (data.error) {                     cc.jqutils.opendialog(data.errordescription, 'error', 'ok', null, null, null);                 } else {                     window.location.href = '/identificonfig/defaultconfiguration';                 }             }         });      } },

which serializes data sent view query string. know data serialized correctly because have viewed string console.log($appform), , it's correct.

however, controller never receives query string. have removed lot of code, controller function looks like:

 [httppost]  public actionresult updateficonfig(string query)  {      namevaluecollection nvc = httputility.parsequerystring(query);       system.diagnostics.debug.writeline(nvc);  }

i receive null pointer on line tries parse query string, , don't know why. help?

i have same thing ajax in project different don't use datatype contenttype: "application/json; charset=utf-8"

data: "{'query' : '" + $appform + "'}"

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