Question

How would you create an extension method which enables me to do the following (warning: exteme pseudo-code)…

class FooBar
{
    Int32 Foo { get; set; }
    String Bar { get; set; }
}

new FooBar().With(fb => new Func<FooBar, Object>(instance =>
{
    // VB With magic
    // NOTE: The instance parameter HAS to be by reference
    instance.Foo = 10;
    instance.Bar;

    return new Object();
}));

If you could specify anonymous functions without a return type (void), the above would look much cleaner…

new FooBar().With(fb => new Func<FooBar, void>(instance =>
{
    instance.Foo = 10;
    instance.Bar;
}));

This is pseudo-code of the worst kind. But I hope you get the idea.

Answer 1

Maybe this will help:

new FooBar().With( fb=> {
    fb.Foo = 10;
    fb.Bar = fb.Foo.ToString();
} );

// ... somewhere else ...
public static void With<T>( this T target, Action<T> action ) {
    action( target );
}