c# - P/Invoke and .NET Target Framework

Question

This question already has answers here: question from:https://stackoverflow.com/questions/65845086/p-invoke-and-net-target-framework

Answer 1

Now that I know it is a string issue I did a little searching and I found this SO question.
So in the end I used the BSTR approach.

BSTR SayHello() {
    return ::SysAllocString(L"Hello");
}

        [DllImport("DBReplicator.Lib.dll")]
        [return: MarshalAs(UnmanagedType.BStr)]
        public static extern string SayHello();

... Still don't know how I managed to get Chinese characters though.