public static bool Is(this Type t1, Type t2, TypeFilterConstraints constraint)
{
switch (constraint)
{
case TypeFilterConstraints.Default:
return(t2.GetTypeInfo().IsAssignableFrom(t1.GetTypeInfo()));
case TypeFilterConstraints.Strict:
return(t1 == t2);
case TypeFilterConstraints.Derived:
return(t1 != t2 && t2.GetTypeInfo().IsAssignableFrom(t1.GetTypeInfo()));
default:
throw new ArgumentOutOfRangeException(nameof(constraint), constraint, null);
}
}
public static bool Is(this object o, Type t, TypeFilterConstraints constraint)
{
switch (constraint)
{
case TypeFilterConstraints.Default:
return(o.GetType().IsInstanceOfType(t));
case TypeFilterConstraints.Strict:
return(o.GetType() == t);
case TypeFilterConstraints.Derived:
return(o.GetType() != t && o.IsInstanceOfType(t));
default:
throw new ArgumentOutOfRangeException(nameof(constraint), constraint, null);
}
}
public static bool Is <T>(this object o, TypeFilterConstraints constraint)
{
switch (constraint)
{
case TypeFilterConstraints.Default:
return(o is T);
case TypeFilterConstraints.Strict:
return(o.GetType() == typeof(T));
case TypeFilterConstraints.Derived:
return(!(o is T) && o.GetType() == typeof(T));
default:
throw new ArgumentOutOfRangeException(nameof(constraint), constraint, null);
}
}
public static bool TypeMatch(this IEnumerable <Type> types, Type type, TypeFilterConstraints constraint)
{
return(types.Any(t => type.Is(t, constraint)));
}
public static IEnumerable <TResult> OfType <TResult>(this IEnumerable source, TypeFilterConstraints constraint)
{
if (source == null)
{
throw new NullReferenceException(nameof(source));
}
switch (constraint)
{
case TypeFilterConstraints.Default:
return(source.OfType <TResult>());
case TypeFilterConstraints.Strict:
return(OfTypeStrictIterator <TResult>(source));
case TypeFilterConstraints.Derived:
return(OfTypeDerivedIterator <TResult>(source));
default:
throw new ArgumentOutOfRangeException(nameof(constraint), constraint, null);
}
}
