C#怎么判断文件处于打开状态

C#如何判断文件处于打开状态

对于应用程序，有时候可能需要判断某个文件是否已经被打开，也就是指是否被某个流连接着。这在对文件的读写比较频繁的程序中尤为重要，因为一个文件同一时刻只能有一个流连接的。下面的代码也许能有所帮助。

 public class FileStatus    {        [DllImport("kernel32.dll")]        private static extern IntPtr _lopen(string lpPathName, int iReadWrite);        [DllImport("kernel32.dll")]        private static extern bool CloseHandle(IntPtr hObject);        private const int OF_READWRITE = 2;        private const int OF_SHARE_DENY_NONE = 0x40;        private static readonly IntPtr HFILE_ERROR = new IntPtr(-1);        public static int FileIsOpen(string fileFullName)        {            if (!File.Exists(fileFullName))            {                return -1;            }            IntPtr handle = _lopen(fileFullName, OF_READWRITE | OF_SHARE_DENY_NONE);            if (handle == HFILE_ERROR)            {                return 1;            }            CloseHandle(handle);            return 0;        }    }

测试：

    class Program    {        static void Main(string[] args)        {            string testFilePath = AppDomain.CurrentDomain.SetupInformation.ApplicationBase + @"testOpen.txt";            FileStream fs = new FileStream(testFilePath, FileMode.OpenOrCreate, FileAccess.Read);            BinaryReader br = new BinaryReader(fs);            br.Read();            Console.WriteLine("文件被打开");            int result =FileStatus.FileIsOpen(testFilePath);            Console.WriteLine(result);            br.Close();            Console.WriteLine("文件被关闭");            result = FileStatus.FileIsOpen(testFilePath);            Console.WriteLine(result);            Console.ReadLine();        }    }

结果：

代码下载：http://download.csdn.net/detail/yysyangyangyangshan/4914142