possible solution: propertyType = propertyInfo[propertyInfoIndex].PropertyType; if (propertyType.IsGenericType && propertyType.GetGenericTypeDefinition() == typeof(Nullable<>)) { propertyType = propertyType.GetGenericArguments()[0]; }
int? is shorthand for Nullable<int>. This may be the post you were looking for.
Just omit the [Required] attribute from the string somefield property. This will make it create a NULLable column in the db. To make int types allow NULLs in the database, they must be declared as nullable ints in the model: // an int can never be null, so it will be created as NOT NULL … Read more
boolean can only be true or false because it’s a primitive datatype (+ a boolean variables default value is false). You can use the class Boolean instead if you want to use null values. Boolean is a reference type, that’s the reason you can assign null to a Boolean “variable”. Example: Boolean testvar = null; … Read more
You have to use Nullable.GetUnderlyingType to get underlying type of Nullable. This is the method I use to overcome limitation of ChangeType for Nullable public static T ChangeType<T>(object value) { var t = typeof(T); if (t.IsGenericType && t.GetGenericTypeDefinition().Equals(typeof(Nullable<>))) { if (value == null) { return default(T); } t = Nullable.GetUnderlyingType(t); } return (T)Convert.ChangeType(value, t); } … Read more
public static bool IsNullableEnum(this Type t) { Type u = Nullable.GetUnderlyingType(t); return (u != null) && u.IsEnum; }
You’re observing the effects of a lifted operator. From section 7.3.7 of the C# 5 specification: Lifted operators permit predefined and user-defined operators that operate on non-nullable value types to also be used with nullable forms of those types. Lifted operators are constructed from predefined and user-defined operators that meet certain requirements, as described in … Read more
This would be the null forgiving operator. It tells the compiler “this isn’t null, trust me”, so it does not issue a warning for a possible null reference. In this particular case it tells the compiler that Entity isn’t null.
I got it to work with @Html.EditorFor(model => model.Foo) and then making a file at Views/Shared/EditorTemplates/Boolean.cshtml with the following: @model bool? @Html.CheckBox(“”, Model.GetValueOrDefault())
This seems to be working – (void)methodWithArg:(nonnull NSString *)arg1 andArg:(nullable NSString *)arg2 completionHandler:(nullable void (^) (NSArray * _Nullable results, NSError * _Nonnull error))completionHandler You need to specify nullability both for the block and its parameters… EDIT: For more information, see Swift Blog