static Type GetNonNullableType(this Type type)
{
return(NonNullableTypes.GetOrAdd(type, key =>
{
if (key.IsGenericType &&
key.GetGenericTypeDefinition() == NullableType)
{
return key.GetGenericArguments()[0];
}
return key;
}));
}
bool IsNullable(ModelAttribute modelAttribute)
{
return !modelAttribute.Required && !modelAttribute.IsIdentity && !modelAttribute.IsConcurrencyToken && !NonNullableTypes.Contains(modelAttribute.Type);
}