internal static IModelBinder GetBinderFromAttributes(Type type, Action <Type> errorAction)
{
AttributeList allAttrs = new AttributeList(TypeDescriptorHelper.Get(type).GetAttributes());
CustomModelBinderAttribute binder = allAttrs.SingleOfTypeDefaultOrError <Attribute, CustomModelBinderAttribute, Type>(errorAction, type);
return(binder == null ? null : binder.GetBinder());
}
internal static IModelBinder GetBinderFromAttributes(ICustomAttributeProvider element, Action <ICustomAttributeProvider> errorAction)
{
CustomModelBinderAttribute[] attrs = (CustomModelBinderAttribute[])element.GetCustomAttributes(typeof(CustomModelBinderAttribute), true /* inherit */);
// For compatibility, return null if no attributes.
if (attrs == null)
{
return(null);
}
CustomModelBinderAttribute binder = attrs.SingleDefaultOrError(errorAction, element);
return(binder == null ? null : binder.GetBinder());
}
private static IModelBinder GetBinderFromAttributesImpl(CustomModelBinderAttribute[] attrs, Func<string> errorMessageAccessor) {
// this method is used to get a custom binder based on the attributes of the element passed to it.
// it will return null if a binder cannot be detected based on the attributes alone.
if (attrs == null) {
return null;
}
switch (attrs.Length) {
case 0:
return null;
case 1:
IModelBinder binder = attrs[0].GetBinder();
return binder;
default:
string errorMessage = errorMessageAccessor();
throw new InvalidOperationException(errorMessage);
}
}
