C# Winform实现导入和导出Excel文件

/// <summary>
    /// 导出Excel文件
    /// </summary>
    /// /// <param name="dataSet"></param>
    /// <param name="dataTable">数据集</param>
    /// <param name="isShowExcle">导出后是否打开文件</param>
    /// <returns></returns>
    public static bool DataTableToExcel(string filePath, System.Data.DataTable dataTable, bool isShowExcle)
    {
      //System.Data.DataTable dataTable = dataSet.Tables[0];
      int rowNumber = dataTable.Rows.Count;
      int columnNumber = dataTable.Columns.Count;
      int colIndex = 0;
 
      if (rowNumber == 0)
      {
        return false;
      }
 
      Microsoft.Office.Interop.Excel.Application excel = new Microsoft.Office.Interop.Excel.Application();
      Microsoft.Office.Interop.Excel.Workbook workbook = excel.Workbooks.Add(Microsoft.Office.Interop.Excel.XlWBATemplate.xlWBATWorksheet);
      Microsoft.Office.Interop.Excel.Worksheet worksheet = (Microsoft.Office.Interop.Excel.Worksheet)workbook.Worksheets[1];
      excel.Visible = isShowExcle;
      Microsoft.Office.Interop.Excel.Range range;
 
 
      foreach (DataColumn col in dataTable.Columns)
      {
        colIndex++;
        excel.Cells[1, colIndex] = col.ColumnName;
      }
 
      object[,] objData = new object[rowNumber, columnNumber];
 
      for (int r = 0; r < rowNumber; r++)
      {
        for (int c = 0; c < columnNumber; c++)
        {
          objData[r, c] =dataTable.Rows[r][c];
        }
      }
 
      range = worksheet.get_Range(excel.Cells[2, 1], excel.Cells[rowNumber + 1, columnNumber]);
 
      range.Value2 = objData;
 
      range.NumberFormatLocal = "@";
 
      worksheet.SaveAs(filePath, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing);
 
      //excel.Quit();
      return true;
    }

 /// <summary>
    /// 读取Excel文件数据到DataTable
    /// </summary>
    /// <param name="filePath">Excel文件路径</param>
    private void Import_Excel(string filePath)
    {
      string sqlconn = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + filePath + ";Extended Properties='Excel 8.0;HDR=False;IMEX=1'";
 
      string sql = @"select * from [Sheet1$]";
 
      try
      {
        using (OleDbConnection conn = new OleDbConnection(sqlconn))
        {
          using (OleDbDataAdapter adapter = new OleDbDataAdapter(sql, conn))
          {
            System.Data.DataTable dt = new System.Data.DataTable();
            adapter.Fill(dt);
 
            this.LoadDataGridView(dt);
          }
        }
      }
      catch (Exception ex)
      {
        MessageBox.Show("打开文件出错，错误信息：" + ex.Message.ToString(), "提示");
      }
    }