public bool GetFiles(string equipName)
        {
            //choose all sheet?  or all data in sheet?
            string strExcel = "select * from [Sheet1$]";
            //初始化system.IO的配置（路径)
            DirectoryInfo directoryInfo1 = new DirectoryInfo(WPath + equipName + "\\Working");
            //用文件流来获取文件夹中所有文件，存放到
            FileInfo[] files1 = directoryInfo1.GetFiles();
            foreach (FileInfo file in files1) // Directory.GetFiles(srcFolder)
            {
                // 连接到excel 数据源,   xlsx要用ACE
                string strConn = ("Provider=Microsoft.ACE.OLEDB.12.0;" + "Data Source= " + file.FullName + "; Extended Properties='Excel 12.0';");
                OleDbConnection OledbConn = new OleDbConnection(strConn);
                if (IsUsed(file.FullName))
                {
                    flag = IsUsed(file.FullName);

                    continue;
                }
                try
                {
                    OledbConn.Open();
                    // 存入datatable
                    OleDbDataAdapter dAdapter = new OleDbDataAdapter(strExcel, strConn);
　　　　　　　　　　　　//写入ds中的一个table
                    dAdapter.Fill(ds);
                    OledbConn.Dispose();
                    OledbConn.Close();
                }
                catch (Exception ex)
                {

                }
            }
        }