System.Runtime.InteropServices.MarshalTests.PtrToStringAutoWithLength C# (CSharp) Method

        public static void PtrToStringAutoWithLength()
        {
            Assert.Throws<ArgumentNullException>(() => Marshal.PtrToStringAuto(IntPtr.Zero, 0));

            String s = "Hello World";
            int len = 5;
            IntPtr ptr = Marshal.StringToCoTaskMemAuto(s);

            
            String s2 = Marshal.PtrToStringAuto(ptr, len);
            Assert.Equal(s.Substring(0, len), s2);

            Marshal.FreeCoTaskMem(ptr);  
        }