public object Bind(BindingContext context)
{
IValueProvider provider = new DictionaryValueProvider(context.Parameters);
// Rewrite the provided context to ensure all the parameters
// provided by user is set correctly.
BindingContext inner = new BindingContext(context,
context.ModelType, context.ModelName, provider, context.ModelState);
ValueProviderResult value;
if (inner.TryGetValue(out value))
return value.Value;
return null;
}