C#_简单Excel导入

引用程序集

Microsoft.Office.Core

Microsoft.Office.Interop.Excel

 using System;
 using System.Collections.Generic;
 using System.Data.SqlClient;
 using Excel = Microsoft.Office.Interop.Excel;

 private void btnImport_ItemClick(object sender, DevExpress.XtraBars.ItemClickEventArgs e)
 {
         System.Windows.Forms.OpenFileDialog fd = new OpenFileDialog();  //打开文件对话框
          fd.Filter = @"Excel文件 (*.xls; *.xlsx)|*.xls; *.xlsx|
                           All Files (*.*)|*.*";                            //过滤exl文件

             if (fd.ShowDialog() == DialogResult.OK)
             {
                 string fileName = fd.FileName;//文件名
                 try
                 {
                     LoadExcelData(fileName);
                    // LoadData();
                 }
                 catch (Exception ex)
                 {
                     throw;
                 }
                 finally
                 {

                 }

             }
 }

 private void LoadExcelData(string fileName)
         {

             Excel.Application excel = new Excel.ApplicationClass();
             try
             {
                 if (excel == null)
                 {
                     MsgDialog.Show("无法打开Excle文件！", this);
                 }
                 else
                 {
                     excel.Visible = false;
                     excel.UserControl = true;
                     Excel.Workbook wb = excel.Application.Workbooks.Open(fileName, missing, missing, missing, missing,
                         missing,
                         missing, missing, missing, true, missing, missing, missing, missing, missing);
                     Excel.Worksheet ws = (Excel.Worksheet)wb.Worksheets.get_Item();
                     int columnsint = ws.UsedRange.Cells.Columns.Count; //得到列数
                     int rowsint = ws.UsedRange.Cells.Rows.Count; //得到行数   

                     StringBuilder sqllist = new StringBuilder();
                     string sqltext = "";

                     string column1, column2, column3;
                     bool repeat = false;

                     for (int i = ; i <= rowsint; i++)
                     {

                         //this.barButtonItem5.Caption = "正在扫描第" + i + "条记录，共" + rowsint + "条";

                         sqltext = "";
                         if (((Excel.Range)ws.Cells[i, ]).Value2 == null)
                         {
                             column1 = "";
                         }
                         else
                         {
                             column1 = ((Excel.Range)ws.Cells[i, ]).Value2.ToString();
                         }

                         if (((Excel.Range)ws.Cells[i, ]).Value2 == null)
                         {
                             column2= "";
                         }
                         else
                         {
                             column2= ((Excel.Range)ws.Cells[i, ]).Value2.ToString();
                         }

                         if (((Excel.Range)ws.Cells[i, ]).Value2 == null)
                         {
                             column3= "";
                         }
                         else
                         {
                             column3= ((Excel.Range)ws.Cells[i, ]).Value2.ToString();
                         }

                         string chRepSql = @"select * from table where column1 ='" + column1 + "' and column2 ='" + column2 + "' and column3 ='" 
　　　　　　　　　　　　　　　　　　　　　　　　　　　+ column3 + "';
                         int countR = DbHelperSQL.Query(chRepSql).Tables[].Rows.Count;
                         if (countR > )
                         {
                             repeat = true;
                         }
                         if (repeat)
                         {
                             sqltext =
                                 " update  table  set  column2 ='" + column2 + "' and column3 ='" + column3 + "'  where column1 ='" + column1
                                 + "\r\n";
                         }
                         else
                         {
                             sqltext =
                                 " insert into table(column1, column2, column3)" +
                                 "VALUES('" + column1 + "','" + column2+ "','" + column3 + "')" + "\r\n";
                         }
                         sqllist.Append(sqltext);
                     }

                     if (sqllist.ToString() == "")
                         return;
                     string msg;
                     SqlTransaction trans = null;
                     try
                     {
                         trans = _connection.BeginTransaction();
                         SqlCommand command = new SqlCommand();
                         command.Connection = _connection;
                         command.Transaction = trans;
                         command.CommandText = sqllist.ToString();

                         command.ExecuteNonQuery();
                         trans.Commit();
                     }
                     catch (Exception ex)
                     {
                         trans.Rollback();
                         msg = "保存过程中出错！错误信息如下：\r\n " + ex.ToString();
                         XtraMessageBox.Show(msg);
                     }
                     msg = "导入成功！";
                     MsgDialog.Show(msg, this);
                 }
             }
             catch (Exception ex)
             {
               string  msg = "保存过程中出错！错误信息如下：\r\n " + ex.ToString();
                XtraMessageBox.Show(msg);
             }
             finally
             {
                 excel.Quit();
                 excel = null;

             }
         }

总结：把exl导入数据库时,把SQL语句组成的字符串一次导入，只连接一次数据库，避免反复连接数据库，速度更快。