/// <summary>
        /// 
        /// 从excel读取数据到datatable
        /// using System.Windows.Forms;
        /// using System.Data.OleDb;
        /// using System.Threading;
        /// </summary>
        /// <param name="hasTitle">excel量是否有头</param>
        /// <returns></returns>

public static  DataTable GetDataFromExcelByConn(bool hasTitle = true)         {

OpenFileDialog openFile = new OpenFileDialog();

　　　   openFile.Filter = "Excel(*.xlsx)|*.xlsx|Excel(*.xls)|*.xls";

　　　   openFile.InitialDirectory = Environment.GetFolderPath(Environment.SpecialFolder.Desktop);

openFile.Multiselect = false;

　　　　Thread th = new Thread(new ThreadStart(delegate ()             {

openFile.ShowDialog();

}));

　　　　th.TrySetApartmentState(ApartmentState.STA);

th.Start();

th.Join();

var filePath = openFile.FileName;

string fileType = System.IO.Path.GetExtension(filePath);

if (string.IsNullOrEmpty(fileType)) return null;

using (DataSet ds = new DataSet())             {

string strCon = string.Format("Provider=Microsoft.Jet.OLEDB.{0}.0;" + "Extended Properties=\"Excel {1}.0;HDR={2};IMEX=1;\";" +  "data source={3};",  (fileType == ".xls" ? 4 : 12), (fileType == ".xls" ? 8 : 12), (hasTitle ? "Yes" : "NO"), filePath);

string strCom = " SELECT * FROM [Sheet1$]";

using (OleDbConnection myConn = new OleDbConnection(strCon))

using (OleDbDataAdapter myCommand = new OleDbDataAdapter(strCom, myConn))                 {

myConn.Open();

myCommand.Fill(ds);

}

if (ds == null || ds.Tables.Count <= 0) return null;

return ds.Tables[0];

}

}