private static object BindChoice(ModelBindingContext bindingContext)
{
Type choiceType = bindingContext.ModelType.GetGenericArguments().FirstOrDefault();
if (choiceType == null)
{
return(null);
}
string valueKey = string.Format("{0}.Id", bindingContext.ModelName);
var provider = bindingContext.ValueProvider.GetValue(valueKey);
string attemptedValue = provider != null ?
provider.AttemptedValue :
null;
var choice = bindingContext.Model ??
Activator.CreateInstance(typeof(Choice <>).MakeGenericType(choiceType));
if (!string.IsNullOrEmpty(attemptedValue))
{
int id = default(int);
bool success = false;
try
{
id = int.Parse(attemptedValue);
success = true;
}
catch (FormatException ex)
{
bindingContext.ModelState.AddModelError(bindingContext.ModelName, ex);
}
if (success)
{
var viewModel = Activator.CreateInstance(choiceType) as IEntityViewModel;
if (viewModel != null)
{
viewModel.Id = id;
}
GenericHelpers.SetChoiceSelection(choiceType, choice, viewModel);
}
}
return(choice);
}