SqlBulkCopy的使用

private void btn_import_Click(object sender, RoutedEventArgs e)
        {
            //先读取文件
            //打开对话框，选择文件。
            OpenFileDialog ofd = new OpenFileDialog(); 
            ofd.Filter = "文本文件|*.txt";
            if (ofd.ShowDialog()==false)
            {
                return;
            } 
            string[] lines = File.ReadLines(ofd.FileName,Encoding.Default).ToArray();

            DateTime startTime = DateTime.Now;

            //新建表
            DataTable dtTable = new DataTable();
            //给表添加列
            dtTable.Columns.Add("StartTellName");
            dtTable.Columns.Add("TellType");
            dtTable.Columns.Add("TellArea");

            //遍历每一行数据，处理数据，添加到行（DataRow）中
            foreach (string line in lines)
            {
                string[] strs = line.Split(‘\t‘);//\t制表符
                string startTellNum = strs[0];
                string tellType = strs[1].Trim(‘"‘);//去除两边的"
                string tellArea = strs[2].Trim(‘"‘);
                DataRow row = dtTable.NewRow();
                row["StartTellName"] = startTellNum;//给字段赋值
                row["TellType"] = tellType;
                row["TellArea"] = tellArea;
                dtTable.Rows.Add(row);//添加到一行中
            }

            //获取配置文件中连接字符串
            string connstr = ConfigurationManager.ConnectionStrings["connstr"].ConnectionString;

            //SqlBulkCopy是实现IDisposable接口的,所以必须用using
            using (SqlBulkCopy bulk = new SqlBulkCopy(connstr))
            {
                bulk.DestinationTableName = "T_TellNum";//指定表名
                //本地列名与数据库列名建立连接
                bulk.ColumnMappings.Add("StartTellName", "starttellnum");
                bulk.ColumnMappings.Add("TellType", "telltype");
                bulk.ColumnMappings.Add("TellArea", "tellarea");
                //把dtTable的数据写到数据库
                bulk.WriteToServer(dtTable);
            }
            TimeSpan ts = DateTime.Now - startTime;
            //计算时间
            MessageBox.Show(ts.ToString());
        }