Excel导入时 判断是否被占用，三种方法：
1：Win7可以,WIN10不可以
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try
{
//原理，如果文件可以被移动，说明未被占用
string strPath = "C:\\123OK.Excel";
string strPath2 = "C:\\123OK22.Excel";
File.Move(strPath, strPath2);
File.Move(strPath2, strPath);
}
catch
{
MessageBox.Show("文件被占用！");
return;
}
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2：文件流
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try
{
//原理，如果文件可写，说明未被占用
System.IO.FileStream stream = System.IO.File.OpenWrite("文件路径");
stream.Close();
}
catch
{
MessageBox.Show("文件被占用！");
return;
}
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3：WIN32 API调用（强烈推荐）
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using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.IO;
using System.Runtime.InteropServices;
namespace WindowsFormsApplication1
{
public partial class Form1 : Form
{
[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);
public Form1()
{
InitializeComponent();
}
private void button1_Click(object sender, EventArgs e)
{
try
{
string vFileName = @"c:\123.xlsx";
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！");
}
catch (Exception ex)
{
throw ex;
}
}
}
}
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原文链接：http://blog.csdn.net/u013816709/article/details/64922566