WinForm讀取Excel文件

這兩天做東西，用到了Excel。需要將Excel中的數據讀取到內存中，經過處理後，保存到數據庫中。在網上找了好多方法，但都有錯誤。現總結下：

1.引用Microsoft.Office.Interop.Excel

2.代碼：

 

/// <summary>
        /// 導入Excel文件，並顯示在列表
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void btnImport_Click(object sender, EventArgs e)
        {
            string worksheetname = string.Empty;
            importtpye = cmbTicketType.Text;
            supplier = cmbSupplier.SelectedValue.ToString();

            #region 導入本地Excel文件

            //導入本地文件
            OpenFileDialog file = new OpenFileDialog();
            file.Filter = "文檔(*.xls)|*.xls";
            if (file.ShowDialog() == DialogResult.OK)
                btnImport.Tag = file.FileName;
            //判斷有沒有文件導入
            if (file.FileName.Length == 0)
            {
                MessageBox.Show("請選擇要導入的文件", "提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
                return;
            }

            #endregion

            #region 獲取Excel的工作表名稱
            //創建Excel實例，獲取worksheet Name
            Microsoft.Office.Interop.Excel.Application oExcel = new Microsoft.Office.Interop.Excel.Application();
            object objMissing = System.Reflection.Missing.Value;
            Microsoft.Office.Interop.Excel.Workbook myBook = (Microsoft.Office.Interop.Excel.Workbook)oExcel.Workbooks.Open(file.FileName, objMissing, objMissing, objMissing, objMissing, objMissing, objMissing, objMissing, objMissing, objMissing, objMissing, objMissing, objMissing, objMissing, objMissing);
            Microsoft.Office.Interop.Excel.Sheets sheets = myBook.Worksheets;
            Microsoft.Office.Interop.Excel.Worksheet worksheet = (Microsoft.Office.Interop.Excel.Worksheet)sheets.get_Item(1);
            worksheetname = worksheet.Name;//獲取worksheet Name
            oExcel.Quit();
            #endregion

            dataTable.Rows.Clear();
            //將Excel表中的數據導入到Datatable中
            DataTable table = LoadExcelToDataTable(file.FileName, worksheetname);

        }

3.代碼：

 

/// <summary>
       /// 加載Excel表到DataTable，跟原始Excel表形式一樣，需要篩選自己有用的數據
       /// </summary>
       /// <param name="filename">需要讀取的Excel文件路徑</param>
       /// <param name="sheetname">工作表名稱</param>
       /// <returns>DataTable</returns>
       public static DataTable LoadExcelToDataTable(string filename, string worksheetname)
       {
           DataTable table;
           //連接字符串
           String sConnectionString = "Provider=Microsoft.Jet.OLEDB.4.0;" + "Data Source=" + filename + ";" + "Extended Properties=\"Excel 8.0;HDR=Yes;IMEX=1\"";
           OleDbConnection myConn = new OleDbConnection(sConnectionString);
           string strCom = " SELECT * FROM [" + worksheetname + "$]";
           myConn.Open();
           OleDbDataAdapter myCommand = new OleDbDataAdapter(strCom, myConn);
           table = new DataTable();
           myCommand.Fill(table);
           myConn.Close();
           return table;
       }

4.注意：有的人的連接字符串寫成這樣：

//連接字符串
            String sConnectionString = "Provider=Microsoft.Jet.OLEDB.4.0;" + "Data Source=" +

filename + ";" + "Extended Properties=Excel 8.0;";

這樣也可以讀取到數據，但是，如果Excel表裏的某一列中既有文本類型的值，又有數字類型的值，即混合類型的列，那麼就會只讀取到一種類型的值，另一種類型的就會爲NULL。

//連接字符串
            String sConnectionString = "Provider=Microsoft.Jet.OLEDB.4.0;" + "Data Source=" + filename + ";" + "Extended Properties=\"Excel 8.0;HDR=Yes;IMEX=1\"";

這樣，後邊加上"HDR=Yse;IMEX=1"，並且這句必須用引號引住，這樣就會把混合類型的數據同一當作文本讀取，不會出現丟數據的現象。