实现文件与目录快速遍历

快速遍历文件与目录相关API

 1  class Program
 2     {
 3         static void Main(string[] args)
 4         {
 5             DateTime mytime = DateTime.Now;
 6             Program myProgram = new Program();
 7             myProgram.FindFileInDir(@"\\172.20.1.10\BOM表\");
 8             Console.WriteLine(DateTime.Now.Subtract(mytime).Seconds);
 9         }
10 
11 
12         [Serializable,System.Runtime.InteropServices.StructLayout(System.Runtime.InteropServices.LayoutKind.Sequential,CharSet = System.Runtime.InteropServices.CharSet.Auto),System.Runtime.InteropServices.BestFitMapping(false)]
13         private struct WIN32_FIND_DATA
14         {
15             public int dwFileAttributes;
16             public int ftCreationTime_dwLowDateTime;
17             public int ftCreationTime_dwHighDateTime;
18             public int ftLastAccessTime_dwLowDateTime;
19             public int ftLastAccessTime_dwHighDateTime;
20             public int ftLastWriteTime_dwLowDateTime;
21             public int ftLastWriteTime_dwHighDateTime;
22             public int nFileSizeHigh;
23             public int nFileSizeLow;
24             public int dwReserved0;
25             public int dwReserved1;
26             [System.Runtime.InteropServices.MarshalAs
27               (System.Runtime.InteropServices.UnmanagedType.ByValTStr,
28               SizeConst = 260)]
29             public string cFileName;
30             [System.Runtime.InteropServices.MarshalAs
31               (System.Runtime.InteropServices.UnmanagedType.ByValTStr,
32               SizeConst = 14)]
33             public string cAlternateFileName;
34         }
35         [System.Runtime.InteropServices.DllImport("kernel32.dll", CharSet = System.Runtime.InteropServices.CharSet.Auto, SetLastError = true)]
36         private static extern IntPtr FindFirstFile(string pFileName, ref WIN32_FIND_DATA pFindFileData);
37         [System.Runtime.InteropServices.DllImport("kernel32.dll", CharSet = System.Runtime.InteropServices.CharSet.Auto, SetLastError = true)]
38         private static extern bool FindNextFile(IntPtr hndFindFile, ref WIN32_FIND_DATA lpFindFileData);
39         [System.Runtime.InteropServices.DllImport("kernel32.dll", SetLastError = true)]
40         private static extern bool FindClose(IntPtr hndFindFile);
41 
42         //具体方法函数
43 
44         Stack<string> m_scopes = new Stack<string>();
45         private static readonly IntPtr INVALID_HANDLE_VALUE = new IntPtr(-1);
46         WIN32_FIND_DATA FindFileData;
47         private System.IntPtr hFind = INVALID_HANDLE_VALUE;
48         void FindFileInDir(string rootDir)
49         {
50             int count = 0;
51             string path = rootDir;
52         start:
53             new FileIOPermission(FileIOPermissionAccess.PathDiscovery, Path.Combine(path, ".")).Demand();
54             if (path[path.Length - 1] != '\\')
55             {
56                 path = path + "\\";
57             }
58             //Console.WriteLine("文件夹为：" + path + "<br>");
59             hFind = FindFirstFile(Path.Combine(path, "*"), ref FindFileData);
60             if (hFind != INVALID_HANDLE_VALUE)
61             {
62                 do
63                 {
64                     if (FindFileData.cFileName.Equals(@".") || FindFileData.cFileName.Equals(@".."))
65                         continue;
66                     if ((FindFileData.dwFileAttributes & 0x10) != 0)
67                     {
68                         m_scopes.Push(Path.Combine(path, FindFileData.cFileName));
69                     }
70                     else
71                     {
72                         Regex mygex = new Regex("^.*5233.*\\.xls$");
73                         if (mygex.IsMatch(FindFileData.cFileName))
74                         {
75                             Console.WriteLine(path + "\\" + FindFileData.cFileName);
76                             count = count + 1;
77                         }
78                     }
79                 }
80                 while (FindNextFile(hFind, ref FindFileData));
81             }
82             FindClose(hFind);
83             if (m_scopes.Count > 0)
84             {
85                 path = m_scopes.Pop();
86                 goto start;
87             }
88 
89             Console.WriteLine(count.ToString());
90         }
91     }