C#操作EXCEL DataTable轉換的執行個體代碼

//載入Excel          public   DataSet LoadDataFromExcel(string filePath)         {             try            {                 string strConn;                 //strConn = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + filePath + ";Extended Properties='Excel 8.0;HDR=False;IMEX=1'";                 strConn = string.Format("Provider=Microsoft.ACE.OLEDB.12.0;Data Source={0};Extended Properties='Excel 8.0;HDR=Yes;IMEX=1;'", filePath);                 OleDbConnection OleConn = new OleDbConnection(strConn);                 OleConn.Open();                 String sql = "SELECT * FROM  [Sheet1$]";//可是更改Sheet名稱，比如sheet2，等等                  OleDbDataAdapter OleDaExcel = new OleDbDataAdapter(sql, OleConn);                 DataSet OleDsExcle = new DataSet();                 OleDaExcel.Fill(OleDsExcle, "Sheet1");                 OleConn.Close();                 return OleDsExcle;             }             catch (Exception err)             {                 return null;             }         }         /// <summary>         /// DataTable直接匯出Excel,此方法會把DataTable的資料用Excel開啟,再自己手動去儲存到確切的位置         /// </summary>         /// <param name="dt">要匯出Excel的DataTable</param>         /// <returns></returns>         public bool DoExport(System.Data.DataTable dt)         {             Microsoft.Office.Interop.Excel.Application app = new ApplicationClass();             if (app == null)             {                 throw new Exception("Excel無法啟動");             }             app.Visible = true;             Workbooks wbs = app.Workbooks;             Workbook wb = wbs.Add(Missing.Value);             Worksheet ws = (Worksheet)wb.Worksheets[1];             int cnt = dt.Rows.Count;             int columncnt = dt.Columns.Count;             // *****************擷取資料********************             object[,] objData = new Object[cnt + 1, columncnt];  // 建立快取資料             // 擷取欄位標題             for (int i = 0; i < columncnt; i++)             {                 objData[0, i] = dt.Columns[i].ColumnName;             }             // 擷取具體資料             for (int i = 0; i < cnt; i++)             {                 System.Data.DataRow dr = dt.Rows[i];                 for (int j = 0; j < columncnt; j++)                 {                     objData[i + 1, j] = dr[j];                 }             }             //********************* 寫入Excel******************             Range r = ws.get_Range(app.Cells[1, 1], app.Cells[cnt + 1, columncnt]);             r.NumberFormat = "@";             //r = r.get_Resize(cnt+1, columncnt);             r.Value2 = objData;             r.EntireColumn.AutoFit();             app = null;             return true;         }