C# 判断文件是否被占用的两种方法

1.第一种方法：

[csharp] view plain copy

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：

[csharp] view plain copy

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

}