c# - ASP.NET: Modelbinder only delegating -

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i'm facing problem ith custom modelbinder.

i have 2 models (inheriting base class) displayed editortemplates.

base-class:

public abstract class questionanswerinputmodel {     public guid questionid {         get; set;     } }

modelclass 1: 

public class ratingquestioninputmodel : questionanswerinputmodel{     [required]     [range(1,4)]     public int? rating { get; set; } }

modelclass 2: 

public class freetextquestioninputmodel: questionanswerinputmodel{     [required]     public string freetext { get; set; } }

to bound implemented custom modelbinder: 

public class questionanswermodelbinder : defaultmodelbinder {     public override object bindmodel(controllercontext controllercontext, modelbindingcontext bindingcontext) {          questionanswerinputmodel model;          if ((typeof(questionanswerinputmodel) != bindingcontext.modeltype)) {             return null;         }          modelbindingcontext context = new modelbindingcontext(bindingcontext);          type typeofmodel;          string prefix = bindingcontext.modelname;         if (bindingcontext.valueprovider.containsprefix(prefix + "." + new freetextquestioninputmodel().getpropertyname(m => m.freetext))) {             typeofmodel = typeof(freetextquestioninputmodel);         } else if (bindingcontext.valueprovider.containsprefix(prefix + "." + new ratingquestioninputmodel().getpropertyname(m => m.rating))) {             typeofmodel = typeof(ratingquestioninputmodel);         } else {             return null;         }          context.modelmetadata = new modelmetadata(new dataannotationsmodelmetadataprovider(), bindingcontext.modelmetadata.containertype, null, typeofmodel, bindingcontext.modelname);         return base.bindmodel(controllercontext, context);     } }

all in works great, values fpr properties of models (questionid , rating/freetext) not set? can tell me why? doing wrong?

i tried call 

new defaultmodelbinder().bindmodel(controllercontext, context)

but result same. correctly instantiated objects properties not set.

update:

i tried override createmodel-methode of defaultbinder in post mvc 3 model binding sub type (abstract class or interface).

protected override object createmodel(controllercontext controllercontext, modelbindingcontext bindingcontext, type modeltype) {          if ((typeof(questionanswerinputmodel) != bindingcontext.modeltype)) {             return null;         }          string prefix = bindingcontext.modelname;         if (bindingcontext.valueprovider.containsprefix(prefix + "." + new freetextquestioninputmodel().getpropertyname(m => m.freetext))) {             return new freetextquestioninputmodel();         } else if (bindingcontext.valueprovider.containsprefix(prefix + "." + new ratingquestioninputmodel().getpropertyname(m => m.rating))) {             return new ratingquestioninputmodel();         } else {             return null;         }     }

the model still instantiated correctly. problem is, properties of base class set.

after discussion @macpak found solution. works great me:

protected override object createmodel(controllercontext controllercontext, modelbindingcontext bindingcontext, type modeltype) {      if ((typeof(questionanswerinputmodel) != bindingcontext.modeltype)) {         return null;     }      string prefix = bindingcontext.modelname;      questionanswerinputmodel obj;     if (bindingcontext.valueprovider.containsprefix(prefix + "." + new freetextquestioninputmodel().getpropertyname(m => m.freetext))) {         obj = new freetextquestioninputmodel();     } else if (bindingcontext.valueprovider.containsprefix(prefix + "." + new ratingquestioninputmodel().getpropertyname(m => m.rating))) {         obj = new ratingquestioninputmodel();     } else {         return null;     }      bindingcontext.modelmetadata = modelmetadataproviders.current.getmetadatafortype(null, obj.gettype());     bindingcontext.modelmetadata.model = obj;      return obj; }

i have override createmodel-methode. @macpak!


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