C#_datatable 写入大量数据_BulkCopy

using Microsoft.Win32;

using System;

using System.Collections.Generic;

using System.Configuration;

using System.Data;

using System.Data.SqlClient;

using System.IO;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

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.Shapes;



namespace DataBaseTest

{

    /// <summary>

    /// InportExportDataTest.xaml 的交互逻辑

    /// </summary>

    public partial class InportExportDataTest : Window

    {

        public InportExportDataTest()

        {

            InitializeComponent();

        }



        private void txtImport_Click(object sender, RoutedEventArgs e)

        {

            OpenFileDialog ofd = new OpenFileDialog();

            ofd.Filter = "文本文件|*.txt";

            if (ofd.ShowDialog() != true)

            {

                return;

            }

            string filename = ofd.FileName;

            //小文件可以用ReadLines,大文件用FileStream

            IEnumerable<string> lines =  File.ReadLines(filename,Encoding.Default);



            foreach (string line in lines)

            {

                string[] segs = line.Split('|');

                string name = segs[0];

                int age = Convert.ToInt32(segs[1]);

                SqlHelper.ExecuteNonQuery("insert into T_DataImport values (@name,@age)",

                    new SqlParameter("@name",name),new SqlParameter("@age",age));



            }

            MessageBox.Show("成功导入"+lines.Count()+"条");





            

            

        }



        private void btnBulk_Click(object sender, RoutedEventArgs e)

        {

            string connStr = ConfigurationManager.ConnectionStrings["dbConnStr"].ConnectionString;

            OpenFileDialog ofd = new OpenFileDialog();

            ofd.Filter = "文本文件|*.txt";

            if (ofd.ShowDialog() != true)

            {

                return;

            }

            string filename = ofd.FileName;

            //小文件可以用ReadLines,大文件用FileStream

            string[] lines = File.ReadLines(filename, Encoding.Default).ToArray();



            DateTime startTime = DateTime.Now;



            DataTable table = new DataTable();

            table.Columns.Add("StartTelNum");

            table.Columns.Add("City");

            table.Columns.Add("TelType");

            for(int i=0;i<lines.Length;i++)

            {

                string line = lines[i];

                string[] strs = line.Split('\t'); //TAB键

                string startTelNum = strs[0];

                string city = strs[1];

                city = city.Trim('"');//去掉双引号

                string telType = strs[2];

                telType = telType.Trim('"');



                DataRow row = table.NewRow();//DataRow定义有Internal，所以要new一个row对象

                row["StartTelNum"] = startTelNum;

                row["City"] = city;

                row["TelType"] = telType;

                table.Rows.Add(row);//NewRow只是创建,还没有插入,只是本地的table

            }



            using (SqlBulkCopy bulkCopy = new SqlBulkCopy(connStr))

            {

                bulkCopy.DestinationTableName="T_Student"; //目标table

                bulkCopy.ColumnMappings.Add("StartTelNum", "StartTelNum");//本地table与数据库中table column的mapping

                bulkCopy.ColumnMappings.Add("City", "TelArea");

                bulkCopy.ColumnMappings.Add("TelType", "TelType");

                bulkCopy.WriteToServer(table);

            }

            TimeSpan ts = DateTime.Now - startTime;

        }

    }

}