C#中大批量导入数据SqlBulkCopy

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
using Microsoft.Win32;
using System.IO;
using System.Configuration;
using System.Data.SqlClient;
using System.Data;

namespace WpfApplication1
{
    /// <summary>
    /// MainWindow.xaml 的交互逻辑
    /// </summary>
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, RoutedEventArgs e)
        {
            string connStr = ConfigurationManager.ConnectionStrings["dbConStr"].ConnectionString;
            //int number=0;
            OpenFileDialog ofd = new OpenFileDialog();
            ofd.Filter = "文本文件|*.txt";
            if (ofd.ShowDialog() != true)
            {
                return;
            }

            string filename = ofd.FileName;
            string[] lines = File.ReadAllLines(filename, Encoding.Default).ToArray();
            DateTime startTime = DateTime.Now;

            DataTable table = new DataTable();
            table.Columns.Add("startTelNum");
            table.Columns.Add("City");
            table.Columns.Add("Type");
            foreach (string line in lines)
            {
                string[] strs = line.Split('\t');
                string startTelNumber = strs[0];
                string city = strs[1];
                city = city.Trim('"');
                string telType = strs[2];
                telType = telType.Trim('"');

                DataRow row = table.NewRow();
                row["startTelNum"] = startTelNumber;
                row["City"] = city;
                row["Type"] = telType;
                table.Rows.Add(row);
            }

            using (SqlBulkCopy bulkCopy = new SqlBulkCopy(connStr))
            {
                bulkCopy.DestinationTableName = "T_TelNum";
                bulkCopy.ColumnMappings.Add("startTelNum", "StartTelNumber");
                bulkCopy.ColumnMappings.Add("City", "TelType");
                bulkCopy.ColumnMappings.Add("Type", "TelArea");
                bulkCopy.WriteToServer(table);
            }
            TimeSpan ts = DateTime.Now - startTime;
            MessageBox.Show(ts.ToString());
        }
    }
}