Excel导入时 判断是否被占用

Excel导入时 判断是否被占用，三种方法：

1：Win7可以,WIN10不可以

   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;                }

2：文件流

   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;                }

3：WIN32 API调用（强烈推荐）

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;            }        }    }}