类FileDirectoryEnumerable
public class FileDirectoryEnumerable : System.Collections.IEnumerable { private bool bolReturnStringType = true; /// <summary> /// 是否以字符串方式返回查询结果,若返回true则当前对象返回为字符串, /// 否则返回 System.IO.FileInfo或System.IO.DirectoryInfo类型 /// </summary> public bool ReturnStringType { get { return bolReturnStringType; } set { bolReturnStringType = value; } } private string strSearchPattern = "*"; /// <summary> /// 文件或目录名的通配符 /// </summary> public string SearchPattern { get { return strSearchPattern; } set { strSearchPattern = value; } } private string strSearchPath = null; /// <summary> /// 搜索路径,必须为绝对路径 /// </summary> public string SearchPath { get { return strSearchPath; } set { strSearchPath = value; } } private bool bolSearchForFile = true; /// <summary> /// 是否查找文件 /// </summary> public bool SearchForFile { get { return bolSearchForFile; } set { bolSearchForFile = value; } } private bool bolSearchForDirectory = true; /// <summary> /// 是否查找子目录 /// </summary> public bool SearchForDirectory { get { return bolSearchForDirectory; } set { bolSearchForDirectory = value; } } private bool bolThrowIOException = true; /// <summary> /// 发生IO错误时是否抛出异常 /// </summary> public bool ThrowIOException { get { return this.bolThrowIOException; } set { this.bolThrowIOException = value; } } /// <summary> /// 返回内置的文件和目录遍历器 /// </summary> /// <returns>遍历器对象</returns> public System.Collections.IEnumerator GetEnumerator() { FileDirectoryEnumerator e = new FileDirectoryEnumerator(); e.ReturnStringType = this.bolReturnStringType; e.SearchForDirectory = this.bolSearchForDirectory; e.SearchForFile = this.bolSearchForFile; e.SearchPath = this.strSearchPath; e.SearchPattern = this.strSearchPattern; e.ThrowIOException = this.bolThrowIOException; myList.Add(e); return e; } /// <summary> /// 关闭对象 /// </summary> public void Close() { foreach (FileDirectoryEnumerator e in myList) { e.Close(); } myList.Clear(); } private System.Collections.ArrayList myList = new System.Collections.ArrayList(); }
类FileDirectoryEnumerator
public class FileDirectoryEnumerator : System.Collections.IEnumerator { #region 表示对象当前状态的数据和属性 ********************************** /// <summary> /// 当前对象 /// </summary> private object objCurrentObject = null; private bool bolIsEmpty = false; /// <summary> /// 该目录为空 /// </summary> public bool IsEmpty { get { return bolIsEmpty; } } private int intSearchedCount = 0; /// <summary> /// 已找到的对象的个数 /// </summary> public int SearchedCount { get { return intSearchedCount; } } private bool bolIsFile = true; /// <summary> /// 当前对象是否为文件,若为true则当前对象为文件,否则为目录 /// </summary> public bool IsFile { get { return bolIsFile; } } private int intLastErrorCode = 0; /// <summary> /// 最后一次操作的Win32错误代码 /// </summary> public int LastErrorCode { get { return intLastErrorCode; } } /// <summary> /// 当前对象的名称 /// </summary> public string Name { get { if (this.objCurrentObject != null) { if (objCurrentObject is string) return (string)this.objCurrentObject; else return ((System.IO.FileSystemInfo)this.objCurrentObject).Name; } return null; } } /// <summary> /// 当前对象属性 /// </summary> public System.IO.FileAttributes Attributes { get { return (System.IO.FileAttributes)myData.dwFileAttributes; } } /// <summary> /// 当前对象创建时间 /// </summary> public System.DateTime CreationTime { get { long time = ToLong(myData.ftCreationTime_dwHighDateTime, myData.ftCreationTime_dwLowDateTime); System.DateTime dtm = System.DateTime.FromFileTimeUtc(time); return dtm.ToLocalTime(); } } /// <summary> /// 当前对象最后访问时间 /// </summary> public System.DateTime LastAccessTime { get { long time = ToLong(myData.ftLastAccessTime_dwHighDateTime, myData.ftLastAccessTime_dwLowDateTime); System.DateTime dtm = System.DateTime.FromFileTimeUtc(time); return dtm.ToLocalTime(); } } /// <summary> /// 当前对象最后保存时间 /// </summary> public System.DateTime LastWriteTime { get { long time = ToLong(myData.ftLastWriteTime_dwHighDateTime, myData.ftLastWriteTime_dwLowDateTime); System.DateTime dtm = System.DateTime.FromFileTimeUtc(time); return dtm.ToLocalTime(); } } /// <summary> /// 当前文件长度,若为当前对象为文件则返回文件长度,若当前对象为目录则返回0 /// </summary> public long FileLength { get { if (this.bolIsFile) return ToLong(myData.nFileSizeHigh, myData.nFileSizeLow); else return 0; } } #endregion #region 控制对象特性的一些属性 **************************************** private bool bolThrowIOException = true; /// <summary> /// 发生IO错误时是否抛出异常 /// </summary> public bool ThrowIOException { get { return this.bolThrowIOException; } set { this.bolThrowIOException = value; } } private bool bolReturnStringType = true; /// <summary> /// 是否以字符串方式返回查询结果,若返回true则当前对象返回为字符串, /// 否则返回 System.IO.FileInfo或System.IO.DirectoryInfo类型 /// </summary> public bool ReturnStringType { get { return bolReturnStringType; } set { bolReturnStringType = value; } } private string strSearchPattern = "*"; /// <summary> /// 要匹配的文件或目录名,支持通配符 /// </summary> public string SearchPattern { get { return strSearchPattern; } set { strSearchPattern = value; } } private string strSearchPath = null; /// <summary> /// 搜索的父目录,必须为绝对路径,不得有通配符,该目录必须存在 /// </summary> public string SearchPath { get { return strSearchPath; } set { strSearchPath = value; } } private bool bolSearchForFile = true; /// <summary> /// 是否查找文件 /// </summary> public bool SearchForFile { get { return bolSearchForFile; } set { bolSearchForFile = value; } } private bool bolSearchForDirectory = true; /// <summary> /// 是否查找子目录 /// </summary> public bool SearchForDirectory { get { return bolSearchForDirectory; } set { bolSearchForDirectory = value; } } #endregion /// <summary> /// 关闭对象,停止搜索 /// </summary> public void Close() { this.CloseHandler(); } #region IEnumerator 成员 ********************************************** /// <summary> /// 返回当前对象 /// </summary> public object Current { get { return objCurrentObject; } } /// <summary> /// 找到下一个文件或目录 /// </summary> /// <returns>操作是否成功</returns> public bool MoveNext() { bool success = false; while (true) { if (this.bolStartSearchFlag) success = this.SearchNext(); else success = this.StartSearch(); if (success) { if (this.UpdateCurrentObject()) return true; } else { this.objCurrentObject = null; return false; } } } /// <summary> /// 重新设置对象 /// </summary> public void Reset() { if (this.strSearchPath == null) throw new System.ArgumentNullException("SearchPath can not null"); if (this.strSearchPattern == null || this.strSearchPattern.Length == 0) this.strSearchPattern = "*"; this.intSearchedCount = 0; this.objCurrentObject = null; this.CloseHandler(); this.bolStartSearchFlag = false; this.bolIsEmpty = false; this.intLastErrorCode = 0; } #endregion #region 声明WIN32API函数以及结构 ************************************** [Serializable, System.Runtime.InteropServices.StructLayout (System.Runtime.InteropServices.LayoutKind.Sequential, CharSet = System.Runtime.InteropServices.CharSet.Auto ), System.Runtime.InteropServices.BestFitMapping(false)] private struct WIN32_FIND_DATA { public int dwFileAttributes; public int ftCreationTime_dwLowDateTime; public int ftCreationTime_dwHighDateTime; public int ftLastAccessTime_dwLowDateTime; public int ftLastAccessTime_dwHighDateTime; public int ftLastWriteTime_dwLowDateTime; public int ftLastWriteTime_dwHighDateTime; public int nFileSizeHigh; public int nFileSizeLow; public int dwReserved0; public int dwReserved1; [System.Runtime.InteropServices.MarshalAs (System.Runtime.InteropServices.UnmanagedType.ByValTStr, SizeConst = 260)] public string cFileName; [System.Runtime.InteropServices.MarshalAs (System.Runtime.InteropServices.UnmanagedType.ByValTStr, SizeConst = 14)] public string cAlternateFileName; } [System.Runtime.InteropServices.DllImport ("kernel32.dll", CharSet = System.Runtime.InteropServices.CharSet.Auto, SetLastError = true)] private static extern IntPtr FindFirstFile(string pFileName, ref WIN32_FIND_DATA pFindFileData); [System.Runtime.InteropServices.DllImport ("kernel32.dll", CharSet = System.Runtime.InteropServices.CharSet.Auto, SetLastError = true)] private static extern bool FindNextFile(IntPtr hndFindFile, ref WIN32_FIND_DATA lpFindFileData); [System.Runtime.InteropServices.DllImport("kernel32.dll", SetLastError = true)] private static extern bool FindClose(IntPtr hndFindFile); private static long ToLong(int height, int low) { long v = (uint)height; v = v << 0x20; v = v | ((uint)low); return v; } private static void WinIOError(int errorCode, string str) { switch (errorCode) { case 80: throw new System.IO.IOException("IO_FileExists :" + str); case 0x57: throw new System.IO.IOException("IOError:" + MakeHRFromErrorCode(errorCode)); case 0xce: throw new System.IO.PathTooLongException("PathTooLong:" + str); case 2: throw new System.IO.FileNotFoundException("FileNotFound:" + str); case 3: throw new System.IO.DirectoryNotFoundException("PathNotFound:" + str); case 5: throw new UnauthorizedAccessException("UnauthorizedAccess:" + str); case 0x20: throw new System.IO.IOException("IO_SharingViolation:" + str); } throw new System.IO.IOException("IOError:" + MakeHRFromErrorCode(errorCode)); } private static int MakeHRFromErrorCode(int errorCode) { return (-2147024896 | errorCode); } #endregion #region 内部代码群 **************************************************** private static readonly IntPtr INVALID_HANDLE_VALUE = new IntPtr(-1); /// <summary> /// 查找处理的底层句柄 /// </summary> private System.IntPtr intSearchHandler = INVALID_HANDLE_VALUE; private WIN32_FIND_DATA myData = new WIN32_FIND_DATA(); /// <summary> /// 开始搜索标志 /// </summary> private bool bolStartSearchFlag = false; /// <summary> /// 关闭内部句柄 /// </summary> private void CloseHandler() { if (this.intSearchHandler != INVALID_HANDLE_VALUE) { FindClose(this.intSearchHandler); this.intSearchHandler = INVALID_HANDLE_VALUE; } } /// <summary> /// 开始搜索 /// </summary> /// <returns>操作是否成功</returns> private bool StartSearch() { bolStartSearchFlag = true; bolIsEmpty = false; objCurrentObject = null; intLastErrorCode = 0; string strPath = System.IO.Path.Combine(strSearchPath, this.strSearchPattern); this.CloseHandler(); intSearchHandler = FindFirstFile(strPath, ref myData); if (intSearchHandler == INVALID_HANDLE_VALUE) { intLastErrorCode = System.Runtime.InteropServices.Marshal.GetLastWin32Error(); if (intLastErrorCode == 2) { bolIsEmpty = true; return false; } if (this.bolThrowIOException) WinIOError(intLastErrorCode, strSearchPath); else return false; } return true; } /// <summary> /// 搜索下一个 /// </summary> /// <returns>操作是否成功</returns> private bool SearchNext() { if (bolStartSearchFlag == false) return false; if (bolIsEmpty) return false; if (intSearchHandler == INVALID_HANDLE_VALUE) return false; intLastErrorCode = 0; if (FindNextFile(intSearchHandler, ref myData) == false) { intLastErrorCode = System.Runtime.InteropServices.Marshal.GetLastWin32Error(); this.CloseHandler(); if (intLastErrorCode != 0 && intLastErrorCode != 0x12) { if (this.bolThrowIOException) WinIOError(intLastErrorCode, strSearchPath); else return false; } return false; } return true; }//private bool SearchNext() /// <summary> /// 更新当前对象 /// </summary> /// <returns>操作是否成功</returns> private bool UpdateCurrentObject() { if (intSearchHandler == INVALID_HANDLE_VALUE) return false; bool Result = false; this.objCurrentObject = null; if ((myData.dwFileAttributes & 0x10) == 0) { // 当前对象为文件 this.bolIsFile = true; if (this.bolSearchForFile) Result = true; } else { // 当前对象为目录 this.bolIsFile = false; if (this.bolSearchForDirectory) { if (myData.cFileName == "." || myData.cFileName == "..") Result = false; else Result = true; } } if (Result) { if (this.bolReturnStringType) this.objCurrentObject = myData.cFileName; else { string p = System.IO.Path.Combine(this.strSearchPath, myData.cFileName); if (this.bolIsFile) { this.objCurrentObject = new System.IO.FileInfo(p); } else { this.objCurrentObject = new System.IO.DirectoryInfo(p); } } this.intSearchedCount++; } return Result; }//private bool UpdateCurrentObject() #endregion }
实现
class Program { static void Main(string[] args) { #region 文件操作 FileDirectoryEnumerator e = new FileDirectoryEnumerator(); e.SearchPath = @"upload/"; e.SearchForDirectory = true; e.Reset(); e.ReturnStringType = true; List<string> strlist = new List<string>(); while (e.MoveNext()) { if (e.FileLength == 0) { strlist.Add(e.Name); continue; } System.Console.WriteLine (e.LastAccessTime.ToString("yyyy-MM-dd HH:mm:ss") + " " + e.FileLength + " \t" + e.Name); File.Delete(e.SearchPath + @"/" + e.Name); } e.Close(); for (int i = 0; i < strlist.Count; i++) { FileDirectoryEnumerator newe = new FileDirectoryEnumerator(); newe.SearchPath = @"upload/"+strlist[i]+@"/"; newe.SearchForDirectory = true; newe.Reset(); newe.ReturnStringType = true; Console.WriteLine("--------------------" + newe.SearchPath + "--------------------"); while (newe.MoveNext()) { System.Console.WriteLine (newe.LastAccessTime.ToString("yyyy-MM-dd HH:mm:ss") + " " + newe.FileLength + " \t" + newe.Name); } newe.Close(); File.Delete(e.SearchPath + @"/" + e.Name); } Console.ReadLine(); #endregion } }
作者:石世特
出处:http://www.cnblogs.com/TivonStone/
希望本文对你有所帮助,想转随便转,心情好的话给我的文章留个链接.o(. .)o