[C#.Net]判断文件是否被占用的两种方法

第一种方法:API

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 FileStream
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
}

引用自:http://www.cnblogs.com/masonlu/p/6867122.html