NullableConverter for Nullable properties of WinForms component

Question

If I write a WinForms visual control and want to make one of its properties of a value type nullable, do I need to create a special type converter or editor for it to make it fully usable in the VS Property Grid?

For example, .NET Framework provides the NullableConverter class. Do I need to attach it to my nullable property via the TypeConverterAttribute?

I tried to convert one of the int properties to int?, and it seems this property works fine in the Property Grid. I can specify a numeric value or clear this property to make it null again.

Answer 1

The property grid uses TypeDescriptor to gets its converter information. So for example, if you have this class:

public class MyClass
{
    public int? NullableInteger { get; set; }
}

With this code:

// get first property's type converter
var cv = TypeDescriptor.GetProperties(typeof(MyClass))[0].Converter;

You will get the TypeConverter for the NullableInteger property, which is already NullableConverter.

So, you don't have to declare it manually.