HSTRING wrapper class

hstring_wrapper.cs

    public class HSTRING
    {
        public IntPtr myString;

        public HSTRING()
        {
            myString = IntPtr.Zero;
        }

        public HSTRING(IntPtr s)
        {
            myString = s;
        }

        public HSTRING(string s)
        {
            Marshal.ThrowExceptionForHR(WindowsCreateString(s, s.Length, out IntPtr h));
            myString = h;
        }
        
        ~HSTRING()
        {
            Marshal.ThrowExceptionForHR(WindowsDeleteString(myString));
        }

        public static IntPtr FromString(string s)
        {
            Marshal.ThrowExceptionForHR(WindowsCreateString(s, s.Length, out IntPtr h));
            return h;
        }

        public static string ToString(IntPtr ptr)
        {
            long stringLength;
            IntPtr stringBackingBuffer = WindowsGetStringRawBuffer(ptr, out stringLength);
            return Marshal.PtrToStringUni(stringBackingBuffer, Convert.ToInt32(stringLength));
        }

        public static void Delete(IntPtr s)
        {
            Marshal.ThrowExceptionForHR(WindowsDeleteString(s));
        }

        [DllImport("api-ms-win-core-winrt-string-l1-1-0.dll", CallingConvention = CallingConvention.StdCall, ExactSpelling = true)]
        private static extern int WindowsCreateString([MarshalAs(UnmanagedType.LPWStr)] string sourceString, int length, out IntPtr hstring);

        [DllImport("api-ms-win-core-winrt-string-l1-1-0.dll", CallingConvention = CallingConvention.StdCall, ExactSpelling = true)]
        private static extern int WindowsDeleteString(IntPtr hstring);

        [DllImport("api-ms-win-core-winrt-string-l1-1-0.dll", CallingConvention = CallingConvention.StdCall, ExactSpelling = true)]
        private static extern IntPtr WindowsGetStringRawBuffer(IntPtr hstring, out long size);
    }