public unsafe class Tst
    {
        [DllImport(@"C:\data\TEST\Win32Project2\Debug\Win32Project2.dll")]
        public static extern int MyFunc(out int sz, out double * p);

        public   static double* test()
        {
            int sz;
            double* d;
            MyFunc(out sz, out d);
            double s=0;
            for (int i = 0; i < sz; i++) s += d[i];
            return d;                                 
    }

    public unsafe class Tst1
    {
        [DllImport(@"C:\data\TEST\Win32Project2\Debug\Win32Project2.dll")]
        public static extern int MyFunc(out int sz, out IntPtr  p);

        public   static IntPtr test()
        {
            IntPtr p;
            int sz;            
            MyFunc(out sz, out p);
            double* d = (double*)p.ToPointer();
            double s=0;
            for (int i = 0; i < sz; i++) s += d[i];
            return p;                       
    }