C# 判断文件有没占用

using System;

using System.Collections.Generic;

using System.Text;

using System.Runtime.InteropServices;

namespace AdminTools

{

public static class FileTools

{

[DllImport("kernel32.dll")]

private static extern IntPtr _lopen(string lpPathName, int iReadWrite);

[DllImport("kernel32.dll")]

private static extern bool CloseHandle(IntPtr hObject);

private const int OF_READWRITE = 2;

private const int OF_SHARE_DENY_NONE = 0x40;

private static readonly IntPtr HFILE_ERROR = new IntPtr(-1);

/// <summary>

/// 检查文件是否已经打开

/// </summary>

/// <param name="strfilepath">要检查的文件路径</param>

/// <returns>true文件已经打开,false文件可用未打开</returns>

public static bool FileUsing(string strfilepath)

{

string vFileName = strfilepath;

// 先检查文件是否存在,如果不存在那就不检查了

if (!System.IO.File.Exists(vFileName))

{

return true;

}

// 打开指定文件看看情况

IntPtr vHandle = _lopen(vFileName, OF_READWRITE | OF_SHARE_DENY_NONE);

if (vHandle == HFILE_ERROR)

{ // 文件已经被打开

return true;

}

CloseHandle(vHandle);

// 说明文件没被打开，并且可用

return false;

}

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