windowsAPI遍历文件夹（速度高于递归）

#region API 遍历文件夹及其子文件夹和子文件

#region 声明WIN32API函数以及结构 **************************************
[DllImport("kernel32.dll", CharSet = CharSet.Auto, SetLastError = true)]
private static extern IntPtr FindFirstFile(string pFileName, ref Win32FindData pFindFileData);
[DllImport("kernel32.dll", CharSet = CharSet.Auto, SetLastError = true)]
private static extern bool FindNextFile(IntPtr hndFindFile, ref Win32FindData lpFindFileData);
[DllImport("kernel32.dll", SetLastError = true)]
private static extern bool FindClose(IntPtr hndFindFile);

private int FILE_SHARE_READ = 0x00000001;
private int FILE_SHARE_WRITE = 0x00000002;
private int FILE_SHARE_DELETE = 0x00000004;
private int FILE_ATTRIBUTE_READONLY = 0x00000001;
private int FILE_ATTRIBUTE_HIDDEN = 0x00000002;
private int FILE_ATTRIBUTE_SYSTEM = 0x00000004;
private int FILE_ATTRIBUTE_DIRECTORY = 0x00000010;
private int FILE_ATTRIBUTE_ARCHIVE = 0x00000020;
private int FILE_ATTRIBUTE_DEVICE = 0x00000040;
private int FILE_ATTRIBUTE_NORMAL = 0x00000080;
private int FILE_ATTRIBUTE_TEMPORARY = 0x00000100;
private int FILE_ATTRIBUTE_SPARSE_FILE = 0x00000200;
private int FILE_ATTRIBUTE_REPARSE_POINT = 0x00000400;
private int FILE_ATTRIBUTE_COMPRESSED = 0x00000800;
private int FILE_ATTRIBUTE_OFFLINE = 0x00001000;
private int FILE_ATTRIBUTE_NOT_CONTENT_INDEXED = 0x00002000;
private int FILE_ATTRIBUTE_ENCRYPTED = 0x00004000;
private int FILE_ATTRIBUTE_INTEGRITY_STREAM = 0x00008000;
private int FILE_ATTRIBUTE_NO_SCRUB_DATA = 0x00020000;
#endregion

//具体参数方法函数
readonly Stack<KeyValuePair<string, string>> _mScopes = new Stack<KeyValuePair<string, string>>();
private static readonly IntPtr InvalidHandleValue = new IntPtr(-1);
Win32FindData _findFileData;
private IntPtr _hFind = InvalidHandleValue;
private double MAXDWORD = 4294967295;
private void FindFileInDir(string root, string pid, List<UpAndDownFolderInfo> lis)
{
_mScopes.Clear();
KeyValuePair<string, string> kvp = new KeyValuePair<string, string>(root, pid);
start:
string path = kvp.Key;
string parentId = kvp.Value;
new FileIOPermission(FileIOPermissionAccess.PathDiscovery, Path.Combine(path, ".")).Demand();
if (path[path.Length - 1] != '\\')
{
path = path + "\\";
}
_hFind = FindFirstFile(Path.Combine(path, "*"), ref _findFileData);

string guid = Guid.NewGuid().ToString();
UpAndDownFolderInfo udfolder = new UpAndDownFolderInfo
{
CreateDate = DateTime.Now,
LGuid = guid,
Name = path.TrimEnd('\\').Substring(path.TrimEnd('\\').LastIndexOf('\\') + 1),
CreaterGuid = CurRuningData.LoginUser.WGuid,
ParentGuid = parentId,
TransState = (byte)EUpAndDownFileStateType.正在传输,
WGuid = guid,
WorkType = (byte)EUpAndDownFileWorkType.上传
};
do
{
if (_hFind != InvalidHandleValue)
{
//将本目录和上一层目录过滤掉
if (_findFileData.cFileName.Equals(@".") || _findFileData.cFileName.Equals(@"..") || _findFileData.dwFileAttributes == (int)FileAttributes.Hidden)
continue;
//如果是文件夹
if ((_findFileData.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY) == FILE_ATTRIBUTE_DIRECTORY &&
(_findFileData.dwFileAttributes & FILE_ATTRIBUTE_HIDDEN) != FILE_ATTRIBUTE_HIDDEN)
{
_mScopes.Push(new KeyValuePair<string, string>(Path.Combine(path, _findFileData.cFileName), udfolder.LGuid));
}
//反之则是文件
else
{
string ft = _findFileData.cFileName.Substring(_findFileData.cFileName.LastIndexOf('.') + 1);
if (ft != "wjyishandsomeboy" && (_findFileData.dwFileAttributes & FILE_ATTRIBUTE_HIDDEN) != FILE_ATTRIBUTE_HIDDEN)
{
UpAndDownFileInfo udfile = new UpAndDownFileInfo
{
CreateDate = DateTime.Now,
CreaterGuid = CurRuningData.LoginUser.WGuid,
FilePath = path + _findFileData.cFileName,
FileType = ft,
LGuid = Guid.NewGuid().ToString(),
Name = _findFileData.cFileName,//.Substring(0, _findFileData.cFileName.LastIndexOf('.') - 1),
ParentGuid = udfolder.LGuid,
TransState = (byte)EUpAndDownFileStateType.等待传输,
UsedSpaceSizeB = (long)(_findFileData.nFileSizeHigh * (MAXDWORD + 1) + _findFileData.nFileSizeLow),
WGuid = Guid.Empty.ToString(),
WorkType = (byte)EUpAndDownFileWorkType.上传,
MD5 = ""//FileHelper.GetMD5(path + _findFileData.cFileName)
};
udfolder.ChildFiles.Add(udfile);
}
}
}
}
while (FindNextFile(_hFind, ref _findFileData));
lis.Add(udfolder);
FindClose(_hFind);
if (_mScopes.Count > 0)
{
kvp = _mScopes.Pop();
goto start;
}
}

#endregion