Question

I created a custom binder that looks like this:

 public override object BindModel(ControllerContext controllerContext, ModelBindingContext bindingContext)
        {

            var o = new MetaObject();
            o.OnBinderLoad();
            o.StatusTypeId = Convert.ToInt32(bindingContext.ValueProvider.GetValue("StatusTypeId").AttemptedValue);
            o.Comments.setValue(bindingContext.ValueProvider.GetValue("Comments").AttemptedValue);
            o.EffectiveDate.setValue(bindingContext.ValueProvider.GetValue("EffectiveDate").AttemptedValue);


           // bindingContext.ModelMetadata = 

            ModelBindingContext newBindingContext = new ModelBindingContext()
            {
                ModelMetadata = ModelMetadataProviders.Current.GetMetadataForType(() => o, typeof(MetaObject)),
                ModelState = bindingContext.ModelState,
                ValueProvider = bindingContext.ValueProvider



            };
            var returnValue = base.BindModel(controllerContext, newBindingContext);
            return returnValue;
        }

I run the debugger and the value of o and newBindingContext.ModelMetadata has the correct data before the call to base.BindModel. After that point Comments and EffectivDate are null.

How do I trace this and why would that happen.

Thanks for the help

Answer 1

Because I was inheriting from DefaultBinder, the base.bindmodel was overriding what I did. I followed the example below and everything is binding correctly.

http://mgolchin.net/posts/20/dive-deep-into-mvc-imodelbinder-part-1