c# - MVC returns invalid json when an exeption is thrown -


i have simple function 

public actionresult getuserlist(int? departmentid)         {                 return content(list.getjson(departmentid), "application/json");             }

i call angular 

$http.post('/stockassignment/getuserlist', { departmentid: departmentid}).then(     function (data) {  /* ok, stuff */ },      function(data) { /* show error, witch should in data.data.msg } );

this works fine, until in list.getjson function throws error. display error using angular, result not valid json. here example of returned data: 

{ "msg" : "unable process type 'anonymous type', because has no known mapping value layer.   @ system.data.entity.core.objects.elinq.expressionconverter.newarrayinittranslator.typedtranslate(expressionconverter parent, newarrayexpression linq)    @ system.data.entity.core.objects.elinq.expressionconverter.translateexpression(expression linq)    @ system.data.entity.core.objects.elinq.expressionconverter.constanttranslator.typedtranslate(expressionconverter parent, constantexpression linq)    @ system.data.entity.core.objects.elinq.expressionconverter.translateexpression(expression linq)    @ system.data.entity.core.objects.elinq.expressionconverter.methodcalltranslator.groupjointranslator.translate(expressionconverter parent, methodcallexpression call)    @ system.data.entity.core.objects.elinq.expressionconverter.methodcalltranslator.typedtranslate(expressionconverter parent, methodcallexpression linq)    @ system.data.entity.core.objects.elinq.expressionconverter.translateexpression(expression linq)    @ system.data.entity.core.objects.elinq.expressionconverter.methodcalltranslator.onelambdatranslator.translate(expressionconverter parent, methodcallexpression call, dbexpression& source, dbexpressionbinding& sourcebinding, dbexpression& lambda)    @ system.data.entity.core.objects.elinq.expressionconverter.methodcalltranslator.selectmanytranslator.translate(expressionconverter parent, methodcallexpression call)    @ system.data.entity.core.objects.elinq.expressionconverter.methodcalltranslator.typedtranslate(expressionconverter parent, methodcallexpression linq)    @ system.data.entity.core.objects.elinq.expressionconverter.translateexpression(expression linq)    @ system.data.entity.core.objects.elinq.expressionconverter.convert()    @ system.data.entity.core.objects.elinq.elinqquerystate.getexecutionplan(nullable`1 formergeoption)    @ system.data.entity.core.objects.objectquery`1.<>c__displayclass7.<getresults>b__6()    @ system.data.entity.core.objects.objectcontext.executeintransaction[t](func`1 func, idbexecutionstrategy executionstrategy, boolean startlocaltransaction, boolean releaseconnectiononsuccess)    @ system.data.entity.core.objects.objectquery`1.<>c__displayclass7.<getresults>b__5()    @ system.data.entity.sqlserver.defaultsqlexecutionstrategy.execute[tresult](func`1 operation)    @ system.data.entity.core.objects.objectquery`1.getresults(nullable`1 formergeoption)    @ system.data.entity.core.objects.objectquery`1.<system.collections.generic.ienumerable<t>.getenumerator>b__0()    @ system.data.entity.internal.lazyenumerator`1.movenext()    @ newtonsoft.json.serialization.jsonserializerinternalwriter.serializelist(jsonwriter writer, ienumerable values, jsonarraycontract contract, jsonproperty member, jsoncontainercontract collectioncontract, jsonproperty containerproperty)    @ newtonsoft.json.serialization.jsonserializerinternalwriter.serializeobject(jsonwriter writer, object value, jsonobjectcontract contract, jsonproperty member, jsoncontainercontract collectioncontract, jsonproperty containerproperty)    @ newtonsoft.json.serialization.jsonserializerinternalwriter.serializeobject(jsonwriter writer, object value, jsonobjectcontract contract, jsonproperty member, jsoncontainercontract collectioncontract, jsonproperty containerproperty)    @ newtonsoft.json.serialization.jsonserializerinternalwriter.serializelist(jsonwriter writer, ienumerable values, jsonarraycontract contract, jsonproperty member, jsoncontainercontract collectioncontract, jsonproperty containerproperty)    @ newtonsoft.json.serialization.jsonserializerinternalwriter.serialize(jsonwriter jsonwriter, object value, type objecttype)    @ newtonsoft.json.jsonserializer.serializeinternal(jsonwriter jsonwriter, object value, type objecttype)    @ norconsult.extensions.jsonhelpers.getjson(object o) in c:\users\hp\documents\visual studio 2017\projects\norconsult\norconsult\extensions\jsonhelpers.cs:line 57"}

angular not able read this, , throws error: 

error: [$http:baddata] http://errors.angularjs.org/1.6.5/$http/baddata?p0=%7b%20%22msg%22%20%3a%20%22unable%20to%20process%20the%20type%20'anonymous%20type'%2c%20because%20it%20has%20no%20known%20mapping%20to%20the%20value%20layer.%20%20%20at%20system.data.entity.core.objects.elinq.expressionconverter.newarrayinittranslator.typedtranslate(expressionconverter%20parent%2c%20newarrayexpression%20linq)%0d%0a%20%20%20at%20system.data.entity.core.objects.elinq.expressionconverter.translateexpression(expression%20linq)%0d%0a%20%20%20at%20system.data.entity.core.objects.elinq.expressionconverter.constanttranslator.typedtranslate(expressionconverter%20parent%2c%20constantexpression%20linq)%0d%0a%20%20%20at%20system.data.entity.core.objects.elinq.expressionconverter.translateexpression(expression%20linq)%0d%0a%20%20%20at%20system.data.entity.core.objects.elinq.expressionconverter.methodcalltranslator.groupjointranslator.translate(expressionconverter%20parent%2c%20methodcallexpression%20call)%0d%0a%20%20%20at%20system.data.entity.core.objects.elinq.expressionconverter.methodcalltranslator.typedtranslate(expressionconverter%20parent%2c%20methodcallexpression%20linq)%0d%0a%20%20%20at%20system.data.entity.core.objects.elinq.expressionconverter.translateexpression(expression%20linq)%0d%0a%20%20%20at%20system.data.entity.core.objects.elinq.expressionconverter.methodcalltranslator.onelambdatranslator.translate(expressionconverter%20parent%2c%20methodcallexpression%20call%2c%20dbexpression%26%20source%2c%20dbexpressionbinding%26%20sourcebinding%2c%20dbexpression%26%20lambda)%0d%0a%20%20%20at%20system.data.entity.core.objects.elinq.expressionconverter.methodcalltranslator.selectmanytranslator.translate(expressionconverter%20parent%2c%20methodcallexpression%20call)%0d%0a%20%20%20at%20system.data.entity.core.objects.elinq.expressionconverter.methodcalltranslator.typedtranslate(expressionconverter%20parent%2c%20methodcallexpression%20linq)%0d%0a%20%20%20at%20system.data.entity.core.objects.elinq.expressionconverter.translateexpression(expression%20linq)%0d%0a%20%20%20at%20system.data.entity.core.objects.elinq.expressionconverter.convert()%0d%0a%20%20%20at%20system.data.entity.core.objects.elinq.elinqquerystate.getexecutionplan(nullable%601%20formergeoption)%0d%0a%20%20%20at%20system.data.entity.core.objects.objectquery%601.%3c%3ec__displayclass7.%3cgetresults%3eb__6()%0d%0a%20%20%20at%20system.data.entity.core.objects.objectcontext.executeintransaction%5bt%5d(func%601%20func%2c%20idbexecutionstrategy%20executionstrategy%2c%20boolean%20startlocaltransaction%2c%20boolean%20releaseconnectiononsuccess)%0d%0a%20%20%20at%20system.data.entity.core.objects.objectquery%601.%3c%3ec__displayclass7.%3cgetresults%3eb__5()%0d%0a%20%20%20at%20system.data.entity.sqlserver.defaultsqlexecutionstrategy.execute%5btresult%5d(func%601%20operation)%0d%0a%20%20%20at%20system.data.entity.core.objects.objectquery%601.getresults(nullable%601%20formergeoption)%0d%0a%20%20%20at%20system.data.entity.core.objects.objectquery%601.%3csystem.collections.generic.ienumerable%3ct%3e.getenumerator%3eb__0()%0d%0a%20%20%20at%20system.data.entity.internal.lazyenumerator%601.movenext()%0d%0a%20%20%20at%20newtonsoft.json.serialization.jsonserializerinternalwriter.serializelist(jsonwriter%20writer%2c%20ienumerable%20values%2c%20jsonarraycontract%20contract%2c%20jsonproperty%20member%2c%20jsoncontainercontract%20collectioncontract%2c%20jsonproperty%20containerproperty)%0d%0a%20%20%20at%20newtonsoft.json.serialization.jsonserializerinternalwriter.serializeobject(jsonwriter%20writer%2c%20object%20value%2c%20jsonobjectcontract%20contract%2c%20jsonproperty%20member%2c%20jsoncontainercontract%20collectioncontract%2c%20jsonproperty%20containerproperty)%0d%0a%20%20%20at%20newtonsoft.json.serialization.jsonserializerinternalwriter.serializeobject(jsonwriter%20writer%2c%20object%20value%2c%20jsonobjectcontract%20contract%2c%20jsonproperty%20member%2c%20jsoncontainercontract%20collectioncontract%2c%20jsonproperty%20containerproperty)%0d%0a%20%20%20at%20newtonsoft.json.serialization.jsonserializerinternalwriter.serializelist(jsonwriter%20writer%2c%20ienumerable%20values%2c%20jsonarraycontract%20contract%2c%20jsonproperty%20member%2c%20jsoncontainercontract%20collectioncontract%2c%20jsonproperty%20containerproperty)%0d%0a%20%20%20at%20newtonsoft.json.serialization.jsonserializerinternalwriter.serialize(jsonwriter%20jsonwriter%2c%20object%20value%2c%20type%20objecttype)%0d%0a%20%20%20at%20newtonsoft.json.jsonserializer.serializeinternal(jsonwriter%20jsonwriter%2c%20object%20value%2c%20type%20objecttype)%0d%0a%20%20%20at%20norconsult.extensions.jsonhelpers.getjson(object%20o)%20in%20c%3a%5cusers%5chp%5cdocuments%5cvisual%20studio%202017%5cprojects%5cnorconsult%5cnorconsult%5cextensions%5cjsonhelpers.cs%3aline%2057%22%7d&p1=%7b%7d

what can able read exeption?

it's refering link:

link

which tells it's bad data, futher more.

msg%22%20%3a%20%22unable%20to%20process%20the%20type%20'anonymous%20type'%2c%20because%20it%20has%20no%20known%20mapping%20to%20the%20value%20layer.%20%20%20at%20system.data.entity.core.objects.elinq.expressionconverter.newarrayinittranslator.typedtranslate

which is

msg unable process type anonymous type because has no known mapping value layer.system.data.entity.core.objects.elinq.expressionconverter.newarrayinittranslator.typedtranslate(so on)

btw it's accii in url.


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