Access violation with generic extensions and ImportAsIs

vvvv gamma bug
1

Hi, came across this recently, seems needs a case to handle:

So consider following:

    public interface IFoo<T>
    {
        void SetBar(T bar);
    }

    public class Foo<T> : IFoo<T>
    {
        private T _bar;

        public void SetBar(T bar)
        {
            _bar = bar;
        }

        public T Bar => _bar;
    }

    public class Bar : Foo<string> { }

    public static class FooExtensions
    {
        public static TFoo With<TFoo, T>(this TFoo foo, T value)
            where TFoo : IFoo<T>
        {
            return foo;
        }
    }

    public static class Usage
    {
        public static void Test()
        {
            var foo = new Foo<string>();
            foo.With("Hello World");

            var bar = new Bar();
            bar.With("Hello World from Bar");
        }
    }

When patch references dll, this results in:

The program '[26244] vvvv.exe' has exited with code 3221225477 (0xc0000005) 'Access violation'.

If AssemblyInfo.cs [assembly: ImportAsIs()] attribute exists, otherwise it imports properly.

Not sure if this is a valid constrain, in first place, not sure what ImportAsIs does, since without it ressolves.

Replacing:

    public static class FooExtensions
    {
        public static IFoo<T> With<T>(this IFoo<T> foo, T value)
        {
            return foo;
        }
    }

Imported properly, hover it return IFoo instead of original type

Blockquote

.

TestGenericExtensioner.zip (2.2 KB)

2

Thanks for the report, fixed in upcoming.

1 Like