If I have a MethodInfo on a closed generic Type is there an easy way to switch those types?

Question

Let\'s say that I have the methodInfo for something like Nullable.HasValue. Is there anyway to convert it to Nullable.HasValue

Answer 1

You can do it easily with a little more reflection. You can't do it magically without reflection.

    static void Main(string[] args)
    {
        PropertyInfo intHasValue = typeof (int?).GetProperty("HasValue");
        PropertyInfo boolHasValue = ChangeGenericType(intHasValue, typeof (bool));
    }

    public static PropertyInfo ChangeGenericType(PropertyInfo property, Type targetType)
    {
        Type constructed = property.DeclaringType;
        Type generic = constructed.GetGenericTypeDefinition();
        Type targetConstructed = generic.MakeGenericType(new[] {targetType});
        return targetConstructed.GetProperty(property.Name);
    }

Of course this is pretty specific to only work for generic types with a single type parameter but it could be generalized to do more if needed.