BExplorer.Shell.KnownFolderHelper.GetKnownFolder C# (CSharp) Метод

        private static IKnownFolder GetKnownFolder(IKnownFolderNative knownFolderNative)
        {
            Debug.Assert(knownFolderNative != null, "Native IKnownFolder should not be null.");

            // Get the native IShellItem2 from the native IKnownFolder
            IShellItem shellItem;
            Guid guid = new Guid(InterfaceGuids.IShellItem);
            HResult hr = knownFolderNative.GetShellItem(0, ref guid, out shellItem);

            if (hr != HResult.S_OK) return null;

            bool isFileSystem = false;

            // If we have a valid IShellItem, try to get the FileSystem attribute.
            if (shellItem != null)
            {
                SFGAO sfgao;
                shellItem.GetAttributes(SFGAO.FILESYSTEM, out sfgao);

                // Is this item a FileSystem item?
                isFileSystem = (sfgao & SFGAO.FILESYSTEM) != 0;
            }

            // If it's FileSystem, create a FileSystemKnownFolder, else NonFileSystemKnownFolder
            if (isFileSystem)
            {
                return FileSystemKnownFolder.Create(knownFolderNative);
            }

            var knownFsFolder = new NonFileSystemKnownFolder(knownFolderNative);
            return knownFsFolder;
        }

        /// <summary>
        /// Returns a known folder given its shell namespace parsing name, such as
        /// <c>::{645FF040-5081-101B-9F08-00AA002F954E}</c> for the Recycle Bin.
        /// </summary>
        /// <param name="parsingName">The parsing name (or path) for the requested known folder.</param>
        /// <returns>A known folder representing the specified name.</returns>
        /// <exception cref="System.ArgumentException">Thrown if the given parsing name is invalid.</exception>
        public static IKnownFolder FromParsingName(string parsingName)
        {
            if (parsingName == null)
            {
                throw new ArgumentNullException("parsingName");
            }

            IntPtr pidl  = IntPtr.Zero;
            IntPtr pidl2 = IntPtr.Zero;

            try
            {
                pidl = Shell32.PidlFromParsingName(parsingName);

                if (pidl == IntPtr.Zero)
                {
                    throw new ArgumentException("Parsing Name", "parsingName");
                }

                // It's probably a special folder, try to get it
                IKnownFolderNative knownFolderNative = KnownFolderHelper.FromPIDL(pidl);
                if (knownFolderNative != null)
                {
                    IKnownFolder kf = KnownFolderHelper.GetKnownFolder(knownFolderNative);
                    if (kf == null)
                    {
                        throw new ArgumentException("Parsing Name", "parsingName");
                    }
                    return(kf);
                }

                // No physical storage was found for this known folder
                // We'll try again with a different name

                // try one more time with a trailing \0
                pidl2 = Shell32.PidlFromParsingName(parsingName.PadRight(1, '\0'));

                if (pidl2 == IntPtr.Zero)
                {
                    throw new ArgumentException("Parsing Name", "parsingName");
                }

                IKnownFolder kf2 = KnownFolderHelper.GetKnownFolder(KnownFolderHelper.FromPIDL(pidl));
                if (kf2 == null)
                {
                    throw new ArgumentException("Parsing Name", "parsingName");
                }

                return(kf2);
            }
            finally
            {
                Shell32.ILFree(pidl);
                Shell32.ILFree(pidl2);
            }
        }