Simple "type-stamp" model binder that can bind complex, abstract objects provided they implement a specific interface ITypeStamped

gistfile1.txt

public class TypeStampedModelBinder : DefaultModelBinder
{
    public override object BindModel(ControllerContext controllerContext, ModelBindingContext bindingContext)
    {
        if (typeof(ITypeStamped).IsAssignableFrom(bindingContext.ModelType))
        {
            // Handle type-stamped model
            var prefix = bindingContext.ModelName;
            if (bindingContext.ValueProvider.ContainsPrefix(prefix))
            {
                var typeStamp = bindingContext.ValueProvider.GetValue(string.Format("{0}.{1}", prefix, "TypeStamp"));
                var modelType = Type.GetType(typeStamp.AttemptedValue);
                bindingContext.ModelMetadata = ModelMetadataProviders.Current.GetMetadataForType(null, modelType);
            }
        }
        return base.BindModel(controllerContext, bindingContext);
    }
}


public interface ITypeStamped
{
    string TypeStamp { get; }
}