C# 判断文件是否被占用的两种方法

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}本回答被提问者采纳