PathTooLongException C# 4.5

Question

I having trouble of copying some folder 260+ chars (for example: F:\NNNNNNNNNNNNNNNN\NNNNNNNNNNN\ROOT\$RECYCLE.BIN\S-1-5-21-3299053755-4209892151-505108915-1000\$RMSL3U8\NNNNNNNNN NNNNNNNN\NNNNNNNNNNN\NNNNNNNNNN\NNNNNNNNNN\publish\Application Files\TNNNNNNNNNNNN_1_0_0_0\NNNNNNNNNNNN.exe.manifest) to some other place with standart DrectoryInfo.Create(); adding \?\ or \?\UNC\ (like "\\?\UNC\") just throw another ArgumentException. What am i doing wrong? What else i can do without using Directory.SetCurrentDirectory() ?

Answer 1

Actually you need to call win32 from c#. We have done this

using System;
using System.IO;
using System.Runtime.InteropServices;
using Microsoft.Win32.SafeHandles;

public static class LongPath
{
    static class Win32Native
    {
        [StructLayout(LayoutKind.Sequential)]
        public class SECURITY_ATTRIBUTES
        {
            public int nLength;
            public IntPtr pSecurityDescriptor;
            public int bInheritHandle;
        }

        [DllImport("kernel32.dll", CharSet = CharSet.Auto, SetLastError = true)]
        public static extern bool CreateDirectory(string lpPathName, SECURITY_ATTRIBUTES lpSecurityAttributes);

        [DllImport("kernel32.dll", CharSet = CharSet.Auto, SetLastError = true)]
        public static extern SafeFileHandle CreateFile(string lpFileName, int dwDesiredAccess, FileShare dwShareMode, SECURITY_ATTRIBUTES securityAttrs, FileMode dwCreationDisposition, int dwFlagsAndAttributes, IntPtr hTemplateFile);
    }

    public static bool CreateDirectory(string path)
    {
        return Win32Native.CreateDirectory(String.Concat(@"\\?\", path), null);
    }

    public static FileStream Open(string path, FileMode mode, FileAccess access)
    {
        SafeFileHandle handle = Win32Native.CreateFile(String.Concat(@"\\?\", path), (int)0x10000000, FileShare.None, null, mode, (int)0x00000080, IntPtr.Zero);
        if (handle.IsInvalid)
        {
            throw new System.ComponentModel.Win32Exception();
        }
        return new FileStream(handle, access);
    }
}

A sample code:

string path = @"c:\".PadRight(255, 'a');
LongPath.CreateDirectory(path);

path = String.Concat(path, @"\", "".PadRight(255, 'a'));
LongPath.CreateDirectory(path);

string filename = Path.Combine(path, "test.txt");

FileStream fs = LongPath.Open(filename, FileMode.CreateNew, FileAccess.Write);

using (StreamWriter sw = new StreamWriter(fs))
{
    sw.WriteLine("abc");
}