C# 判断文件是否被占用的两种方法

来源：互联网发布：迅雷极速版 mac 破解编辑：程序博客网时间：2024/05/17 01:29

1.第一种方法：

using System.IO;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);            inUse = false;        }        catch        {        }        finally        {            if (fs != null)                fs.Close();        }        return inUse;//true表示正在使用,false没有使用}