C#判断文件是否打开

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，你就不要拿来耍了");

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！");

}