How do I express a void method call as the result of DynamicMetaObject.BindInvokeMember?

Question

I\'m trying to give a short example of IDynamicMetaObjectProvider for the second edition of C# in Depth, and I\'m running into issues.

I want to be able to express a voi

Answer 1

I don't like this, but it seems to work; the real problem seems to be the binder.ReturnType coming in oddly (and not being dropped ("pop") automatically), but:

if (target.Type != binder.ReturnType) {
    if (target.Type == typeof(void)) {
        target = Expression.Block(target, Expression.Default(binder.ReturnType));
    } else if (binder.ReturnType == typeof(void)) {
        target = Expression.Block(target, Expression.Empty());
    } else {
        target = Expression.Convert(target, binder.ReturnType);
    }
}
return new DynamicMetaObject(target, restrictions);