Question

I’m looping on the fields and properties on a given Type and I’d like to test if the field type or property Type implements INotifyPropertyChanged.

Maybe it sounds strange but I will parse fields/properties such as strings, integers and other types, but I also have some ObservableCollection for example and some custom types I defined that inherit from INotifyPropertyChanged.

So on my code, I’d like to do some tests based on the fact that the field or property implements INotifyPropertyChanged or not.

Answer 1

You can use GetInterface or GetInterfaces:

static bool SupportsINotifyPropertyChanged(this Type type)
{
    return null != type.GetInterface(typeof(INotifyPropertyChanged).FullName);
    // or
    // return type.GetInterfaces().Any(x => x == typeof(INotifyPropertyChanged));
}

Or a slightly more generic approach:

static bool SupportsInterface<T>(this Type type)
{
    if (!typeof(T).IsInterface) throw new InvalidOperationException();
    return type != null && type.GetInterfaces().Any(x => x == typeof(T));
}