DataGridView导出到Excel的三个方法[亲测]

/// <summary>
/// 打开Excel并将DataGridView控件中数据导出到Excel
/// </summary>
/// <param name="dgv">DataGridView对象 </param>
/// <param name="isShowExcle">是否显示Excel界面 </param>
/// <remarks>
/// add com "Microsoft Excel 11.0 Object Library"
/// using Excel=Microsoft.Office.Interop.Excel;
/// </remarks>
/// <returns> </returns>