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());
}
}
}