C# Excel数据转化为Datatable

最近做项目，遇到了处理Excel的问题，要求以Excel为数据源，直接将Excel的数据在dataGridView中显示，主要是分三步进行。

第一：创建Excel文件的连接；

第二：将Excel数据放入datatable；

第三：绑定数据。

//创建Excel文件的连接，返回连接字符串

private string GetStr()   

      {   

          string connectionString = string.Empty;
　　　　OpenFileDialog f = new OpenFileDialog();  

           f.ShowDialog();  

           if (f.FileName != "")  

           {

                if (lookUpEdit1.EditValue.ToString() == "2003")//Excel版本不一样，连接字符串也是不一样的

                {

　　　　　　　　//Excel2003

                  connectionString = "Provider=Microsoft.Jet.OLEDB.4.0;" + "Data Source=" + f.FileName + ";" + "Extended 　　　　　　　　　　　　　　　　　　Properties=Excel 8.0 ;"

　　　　　　 }

                else

                {

　　　　　　　//excel2007、2010

                    connectionString = string.Format(@"Provider=Microsoft.ACE.OLEDB.12.0;Data Source={0};Extended Properties=""Excel 12.0;HDR=NO;IMEX=1""", f.FileName);

                }
            }

            return connectionString;

        }

 

        private void Btn_导入_Click(object sender, EventArgs e)

        {

            if (gridResult == null) return;

           // gridResult.Init(bga.db);

            gridResult.CurrentDataSet.Tables[0].Clear();//清空数据

            DataTable dt_result=gridResult.CurrentDataSet.Tables[0].Clone();

            OleDbConnection conn = null;

            DataTable dt = new DataTable();

            string connectionString = string.Empty;

            string filepath = GetStr();

            string strSheetName = "";

            if (filepath != "" || filepath.Length > 0)

            {

                try

                {

                    conn = new OleDbConnection(filepath);

                    conn.Open();

                    System.Data.DataTable dtTemp = conn.GetOleDbSchemaTable(OleDbSchemaGuid.Tables, null);                     strSheetName = dtTemp.Rows[0][2].ToString().Trim();//获取工作薄的name

                    OleDbDataAdapter oada = new OleDbDataAdapter("select * from [" + strSheetName + "]", conn); //根据工作薄的名字查找对应工作薄的数据

                    oada.Fill(dt);

                    conn.Close();

                    gridResult.DataSource = dt;

                    gridResult.Refresh();

                     gridResult.CurrentDataSet.Tables[0] = dt;

                    XControl.bga_grid.gridResult = null;

                    this.Dispose();//释放资源

                    this.Close();

                }

                catch (Exception ex)

                {
                    XtraMessageBox.Show(ex.Message+" 请重新选择Excel版本");

                    return;

                }

            }

                                }