C# 解決 PathTooLongException 重寫了整個System.IO

最近，因為公司的檔案管理系統需要支持長文件名，也就是260字符上限的問題，上網找了相關的資料，並且找到了外國一個牛人寫的dll,在原有作者的基礎上加了我們需要實現的一些方法。所加方法如下：

如大家需要取dll,請留郵箱，或之後我上傳到csdn.

public static DirectorySecurity GetDirectorySecurity(string longname)
        {
            int length = 0;
            byte[] buffer;// = new byte[65536];
            bool ret = Win32Interop.GetFileSecurity(longname, (int)(SECURITY_INFORMATION.OWNER_SECURITY_INFORMATION | SECURITY_INFORMATION.GROUP_SECURITY_INFORMATION ), null, 0, out length);
            if (length > 0)
            {
                buffer = new byte[length];
                ret = Win32Interop.GetFileSecurity(longname, (int)(SECURITY_INFORMATION.OWNER_SECURITY_INFORMATION | SECURITY_INFORMATION.GROUP_SECURITY_INFORMATION), buffer, (uint)length, out length);
                DirectorySecurity pSD = new DirectorySecurity();
                pSD.SetSecurityDescriptorBinaryForm(buffer);
                return pSD;
            }
            else
            {
                return null;
            }
        }

        public static DirectorySecurity GetDirectorySecurity(string longname, AccessControlSections sec)
        {
            int length = 0;
            byte[] buffer;// = new byte[65536];
            bool ret = Win32Interop.GetFileSecurity(longname, (int)sec, null, 0, out length);
            if (length > 0)
            {
                buffer = new byte[length];
                ret = Win32Interop.GetFileSecurity(longname, (int)sec, buffer, (uint)length, out length);
                DirectorySecurity pSD = new DirectorySecurity();
                pSD.SetSecurityDescriptorBinaryForm(buffer);
                return pSD;
            }
            else
            {
                return null;
            }
        }

        public static FileSecurity GetFileSecurity(string longname)
        {
            int length = 0;
            byte[] buffer;// = new byte[65536];
            bool ret = Win32Interop.GetFileSecurity(longname, (int)(SECURITY_INFORMATION.OWNER_SECURITY_INFORMATION | SECURITY_INFORMATION.GROUP_SECURITY_INFORMATION), null, 0, out length);
            if (length > 0)
            {
                buffer = new byte[length];
                ret = Win32Interop.GetFileSecurity(longname, (int)(SECURITY_INFORMATION.OWNER_SECURITY_INFORMATION | SECURITY_INFORMATION.GROUP_SECURITY_INFORMATION), buffer, (uint)length, out length);
                FileSecurity pSD = new FileSecurity();
                pSD.SetSecurityDescriptorBinaryForm(buffer);
                return pSD;
            }
            else
            {
                return null;
            }
        }

        public static FileSecurity GetFileSecurity(string longname,AccessControlSections sec)
        {
            int length = 0;
            byte[] buffer;// = new byte[65536];
            bool ret = Win32Interop.GetFileSecurity(longname, (int)sec, null, 0, out length);
            if (length > 0)
            {
                buffer = new byte[length];
                ret = Win32Interop.GetFileSecurity(longname, (int)sec, buffer, (uint)length, out length);
                FileSecurity pSD = new FileSecurity();
                pSD.SetSecurityDescriptorBinaryForm(buffer);
                return pSD;
            }
            else
            {
                return null;
            }
        }