c# - There is no ViewData item of type 'IEnumerable<SelectListItem>' that has the key 'CompanyID' -

-

this question has answer here:

i've been reading stackoverflow nothing has been able me this. i'm working on position model has selectlists fields couple other models, yet every time try , save error:

"an exception of type 'system.invalidoperationexception' occurred in system.web.mvc.dll not handled in user code

additional information: there no viewdata item of type 'ienumerable' has key 'companyid'."

here's relevant code view:

views/position/create.cshtml

<div class="form-group">     <label class="control-label col-md-2">company</label>     <div class="col-md-10">         @html.dropdownlist("companyid", (selectlist)viewbag.allcompanies, new { @class = "form-control" })     </div> </div>

here's relevant code controller:

controllers/positioncontroller.cs

        // get: /position/create         public actionresult create()         {             //create query find committees             var query = m in db.majors                         orderby m.major                         select m;             //execute query , store in list             list<majors> allmajors = query.tolist();              //convert list select list format needed html             selectlist allmajorslist = new selectlist(allmajors, "majorid", "major");              viewbag.allmajors = allmajorslist;              //create query find committees             var query2 = c in db.companies                         orderby c.companyname                         select c;             //execute query , store in list             list<company> allcompanies = query2.tolist();              //convert list select list format needed html             selectlist allcompanieslist = new selectlist(allcompanies, "companyid", "companyname");              viewbag.allcompanies = allcompanieslist;              //create query find committees             var query3 = in db.industries                          orderby i.industryname                          select i;             //execute query , store in list             list<industry> allindustries = query3.tolist();              //convert list select list format needed html             selectlist allindustrieslist = new selectlist(allindustries, "industryid", "industryname");              viewbag.allindustries = allindustrieslist;              return view();         }      // post: /position/create     // protect overposting attacks, please enable specific properties want bind to,      // more details see http://go.microsoft.com/fwlink/?linkid=317598.     [httppost]     [validateantiforgerytoken]     public actionresult create([bind(include="positionid,positiontitle,positiontype,positionlocation,positiondeadline,positiondescription")] position position, int[] selectedmajors, int32 companyid, int32 industryid)     {         //find selected committee         company selectedcompany = db.companies.find(companyid);         industry selectedindustry = db.industries.find(industryid);          //associate committee event         position.positioncompany = selectedcompany;         position.positionindustry = selectedindustry;          if (modelstate.isvalid)         {              //if there majors add, add them             if (selectedmajors != null)             {                 foreach (int majorid in selectedmajors)                 {                     majors majortoadd = db.majors.find(majorid);                     position.applicablemajors.add(majortoadd);                 }             }              db.positions.add(position);             db.savechanges();             return redirecttoaction("index");         }          return view(position);     }

i can't seem figure out i'm doing wrong. appreciated!

your problem if (modelstate.isvalid) false.. , you're not resetting viewbag values when return view post..

if viewbag values null, view in viewdata matches name of property , that's why you're getting error. if comment of code in [httpget] action , return view there, same errors.

you should try moving of code private void..

private void loadviewbag()  {         //create query find committees         var query = m in db.majors                     orderby m.major                     select m;         //execute query , store in list         list<majors> allmajors = query.tolist();          //convert list select list format needed html         selectlist allmajorslist = new selectlist(allmajors, "majorid", "major");          viewbag.allmajors = allmajorslist;          //create query find committees         var query2 = c in db.companies                     orderby c.companyname                     select c;         //execute query , store in list         list<company> allcompanies = query2.tolist();          //convert list select list format needed html         selectlist allcompanieslist = new selectlist(allcompanies, "companyid", "companyname");          viewbag.allcompanies = allcompanieslist;          //create query find committees         var query3 = in db.industries                      orderby i.industryname                      select i;         //execute query , store in list         list<industry> allindustries = query3.tolist();          //convert list select list format needed html         selectlist allindustrieslist = new selectlist(allindustries, "industryid", "industryname");          viewbag.allindustries = allindustrieslist; }

then change action to

    // get: /position/create     public actionresult create()     {          loadviewbag();         return view();     }

then change post action 

// post: /position/create // protect overposting attacks, please enable specific properties want bind to,  // more details see http://go.microsoft.com/fwlink/?linkid=317598. [httppost] [validateantiforgerytoken] public actionresult create([bind(include="positionid,positiontitle,positiontype,positionlocation,positiondeadline,positiondescription")] position position, int[] selectedmajors, int32 companyid, int32 industryid) {     //find selected committee     company selectedcompany = db.companies.find(companyid);     industry selectedindustry = db.industries.find(industryid);      //associate committee event     position.positioncompany = selectedcompany;     position.positionindustry = selectedindustry;      if (modelstate.isvalid)     {          //if there majors add, add them         if (selectedmajors != null)         {             foreach (int majorid in selectedmajors)             {                 majors majortoadd = db.majors.find(majorid);                 position.applicablemajors.add(majortoadd);             }         }          db.positions.add(position);         db.savechanges();         return redirecttoaction("index");     }      loadviewbag();     return view(position); }

Comments

Post a Comment

Popular posts from this blog

ios - Memory not freeing up after popping viewcontroller using ARC -

-
hi project arc based, using uinavigationcontroller make transition between viewcontroller. using profiler analyse happening behind scene memory. noticed when push viewcontroller allocate memory components , when pop not freeing allocated memory. since using arc unable implement dealloc or release component. have analysed in detail , there no memory leak in project. i not using strong property push viewcontroller. here how pushing viewcontroller. viewcontroller *obj = [[viewcontroller alloc] init]; [self.navigationcontroller pushviewcontroller:obj animated:no]; any clue whats going on? should free memory have consumed. please advise your description indicates have retain cycle, leads objects not being deallocated. typical source of retain cycles properties assigned loading nib files (usually declared iboutlet ). two strategies break them , release objects: declare property weak : @property (nonatomic, weak) iboutlet uilabel *statuslabel; set property nil in...
Read more

Django REST Framework perform_create: You cannot call `.save()` after accessing `serializer.data` -

-
i have following viewset: class artistprofileviewset(viewsets.modelviewset): queryset = artistprofile.objects.all() serializer_class = artistprofileserializer def perform_create(self, serializer): if serializer.is_valid(): serializer.save() with following serializers: class simpleartisttrackserializer(serializers.hyperlinkedmodelserializer): class meta: model = artisttrack fields = (...my fields...) class artistprofileserializer(serializers.hyperlinkedmodelserializer): owners = userserializer(many=true, required=false) tracks = simpleartisttrackserializer(many=true, required=false) class meta: model = artistprofile fields = (...my fields...) i getting following error: assertionerror: cannot call `.save()` after accessing `serializer.data`.if need access data before committing database inspect 'serializer.validated_data' instead. i don't see editing serializer.data object. th...
Read more

Why does Go error when trying to marshal this JSON? -

-
i'm trying rather simple example of trying decode json file structs using golang. however, when attempting error that json: cannot unmarshal object go value of type []main.track which don't understand. here's code in question, , json can found here . package main import ( "encoding/json" "fmt" "net/http" "os" ) // tracks group of track types type tracks struct { tracks []track } // track represents singular track type track struct { name string url string artist artist } // artist represents single artist type artist struct { name string mbid string url string } func main() { url := "http://ws.audioscrobbler.com/2.0/?method=geo.gettoptracks&api_key=c1572082105bd40d247836b5c1819623&format=json&country=netherlands" response, err := http.get(url) if err != nil { fmt.printf("%s\n", err) os.exit(1) } de...
Read more