Question

C# 判断文件是否被占用的两种方法

Answer 1

1.第一种方法： using System.Runtime.InteropServices; [DllImport(kernel32.dll)] public static extern IntPtr _lopen(string lpPathName, int iReadWrite); [DllImport(kernel32.dll)] public static extern bool CloseHandle(IntPtr hObject); public const int OF_READWRITE = 2; public const int OF_SHARE_DENY_NONE = 0x40; public readonly IntPtr HFILE_ERROR = new IntPtr(-1); private void button1_Click(object sender, EventArgs e){string vFileName = @c:\temp\temp.bmp; if (!File.Exists(vFileName)){MessageBox.Show(文件都不存在!);return;}IntPtr vHandle = _lopen(vFileName, OF_READWRITE | OF_SHARE_DENY_NONE); if (vHandle == HFILE_ERROR){MessageBox.Show(文件被占用！);return;}CloseHandle(vHandle); MessageBox.Show(没有被占用！);} 第二种方法： public static bool IsFileInUse(string fileName){bool inUse = true; FileStream fs = null;try{ fs = new FileStream(fileName, FileMode.Open, FileAccess.Read, FileShare.None); fs.Close();}return inUse;//true表示正在使用,false没有使用}