有三种不同的方法其中update insert 相比于SqlBulkCopy 都比较慢
UserBll类 需要引用UserDal类
UserDal类 需要引用 sqlHelper33类
窗体程序 需要引用UserBll类
1.首先新建一个UserBll 类

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using sanCeng.Model33;
using sannCeng.DAL33;
using NPOI.HSSF.UserModel;
using NPOI.SS.UserModel;
using NPOI.XSSF.UserModel;
using System.Data;
using System.IO;

namespace sanCeng.BLL33
{
    public class UserBll
    {
   
        private UserDal uDAL = new UserDal();

        public void EXcelAdd2()
        {
            string TargetFileNamePath = @"C:\Users\xg\Desktop\test.xls";
            DataTable dataTable = Import(TargetFileNamePath);
            uDAL.DataTableToSQLServer(dataTable);
            
        }
   public static DataTable Import(string strFileName)
        {
            DataTable dt = new DataTable();

            HSSFWorkbook hssfworkbook;
            using (FileStream file = new FileStream(strFileName, FileMode.Open, FileAccess.Read))
            {
                hssfworkbook = new HSSFWorkbook(file);
            }
            ISheet sheet = hssfworkbook.GetSheetAt(0);
            System.Collections.IEnumerator rows = sheet.GetRowEnumerator();

            IRow headerRow = sheet.GetRow(0);
            int cellCount = headerRow.LastCellNum;

            for (int j = 0; j < cellCount; j++)
            {
                ICell cell = headerRow.GetCell(j);
                dt.Columns.Add(cell.ToString());
            }

            for (int i = (sheet.FirstRowNum + 1); i <= sheet.LastRowNum; i++)
            {
                IRow row = sheet.GetRow(i);
                DataRow dataRow = dt.NewRow();

                for (int j = row.FirstCellNum; j < cellCount; j++)
                {
                    if (row.GetCell(j) != null)
                    { 
                        dataRow[j] = row.GetCell(j).ToString();
                    }
                       

                }

                dt.Rows.Add(dataRow);
            }
            return dt;

        }
    }
}

2.新建一个UserDal类

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Data.SqlClient;
using sanCeng.Model33;
using System.Data;

namespace sannCeng.DAL33
{
    public class UserDal
    {
   public  void DataTableToSQLServer(DataTable dt)
        {
            sqlHelper33.DataTableToSQLServer(dt);
        }
}
}

3新建一个sqlHelper33类

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Configuration;

using System.Data.SqlClient;
using System.Data;
using System.IO;
namespace sannCeng.DAL33
{
    class sqlHelper33
    {
        //获取配置文件


        private static string connStr = ConfigurationManager.ConnectionStrings["connstr"].ConnectionString;
     //批量插入
      public static void DataTableToSQLServer(DataTable dt)
        {
            using (SqlConnection destinationConnection = new SqlConnection(connStr))
            {
                destinationConnection.Open();

                using (SqlBulkCopy bulkCopy = new SqlBulkCopy(destinationConnection))
                {

                    bulkCopy.BatchSize = dt.Rows.Count;
                    bulkCopy.DestinationTableName = "T_Users";//要插入的表的表名
                    //bulkCopy.ColumnMappings.Add("sid", "sID");//映射字段名：DataTable列名 数据库中的字段名  
                    bulkCopy.ColumnMappings.Add("Age", "Age");
                    bulkCopy.ColumnMappings.Add("UserName", "UserName");
                    bulkCopy.ColumnMappings.Add("Password", "Password");
                    bulkCopy.ColumnMappings.Add("PhoneNum", "PhoneNum");
                    bulkCopy.ColumnMappings.Add("IsDeleted", "IsDeleted");
                    bulkCopy.WriteToServer(dt);


                }

            }

        }
}
}

4.我用是窗体程序调用 ，控制台其实更方便。

using sanCeng.BLL33;
using sanCeng.Model33;
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace sanCeng.UI
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
  private void button4_Click(object sender, EventArgs e)
        {
            UserBll u2 = new UserBll();
            u2.EXcelAdd2();
            MessageBox.Show("成功");
        }
    }