如何在reportviewer中添加导出下拉菜单的其他选项

using Microsoft.Reporting.WinForms;

// 在报表加载或初始化的事件中
private void ReportViewer_Load(object sender, EventArgs e)
{
    // 获取报表对象
    LocalReport report = reportViewer.LocalReport;

    // 添加自定义的导出选项
    RenderFormat customFormat = new RenderFormat("CustomFormat", "Custom Format");
    report.RenderFormats.Add(customFormat);

    // 设置导出按钮的文本
    reportViewer.ShowExportControls = true;
    reportViewer.ExportDialog.FileName = "Report";

    // 注册导出事件
    reportViewer.LocalReport.SubreportProcessing += LocalReport_SubreportProcessing;
    reportViewer.LocalReport.Exporting += LocalReport_Exporting;
}

// 导出事件处理程序
private void LocalReport_Exporting(object sender, Microsoft.Reporting.WinForms.ExportEventArgs e)
{
    // 检查导出格式
    if (e.Format.Name == "CustomFormat")
    {
        // 执行自定义导出逻辑
        // ...
    }
}

// 子报表处理程序
private void LocalReport_SubreportProcessing(object sender, SubreportProcessingEventArgs e)
{
    // 处理子报表数据
    // ...
}