Question

我的主菜单上有一个名为“Active Reports”的菜单项。当用户选择要打印的报告时，我会在单独的线程中关闭水晶报告查看器。用户可以打开多个报表查看器，我想跟踪它们。主要是此菜单列表将允许用户单击报告，如果报告在处理报告数据时运行时间过长，我可以在该线程上触发中断以取消正在运行的报告。当每个报告查看器关闭时，我将从菜单列表中删除它。我有一个名为ReportThreadClass的类，它跟踪当前正在运行的每个报告及其所属的线程。在线程中关闭报告后，我想更新“活动报告”菜单项，并将正在运行的报告的名称添加到活动报告列表中。这是我创建线程和ReportThreadClass的代码。

public class ReportThreadClass
{
    public Thread Thread { get; set; }
    public bool AbortFlag { get; set; }
    public string ReportName { get; set; }
    public int ReportId { get; set; }
}

  public void RunReport(UAReport report)
    {
        Thread staThread = new Thread(r => ReportDocumentThread((UAReport) r));
        staThread.SetApartmentState(ApartmentState.MTA);
        staThread.Start(report);
    }

    public void ReportDocumentThread(UAReport report)
    {
        var service = new UAReportService(report); //class that creates the report document that will be passed to the report viewer.
        ReportDocument reportDocument = service.CreateReportDocument();
        string reportDesc = report.ReportDesc;

        object args = new object[2] {reportDocument, reportDesc};

        var staThread = new Thread(new ParameterizedThreadStart(ReportViewerThread));

        int nextReportId;
        if (!Program.MainForm.ReportThreads.Any())
            nextReportId = 0;
        else
        {
            nextReportId = Program.MainForm.ReportThreads.Count() + 1;
        }

        ReportThreadClass reportThread = new ReportThreadClass();
        reportThread.Thread = staThread;
        reportThread.ReportName = reportDesc;
        reportThread.AbortFlag = false;
        reportThread.ReportId = nextReportId;

        Program.MainForm.ReportThreads.Add(reportThread); //list of all active reports running.
        Program.MainForm.BuildActiveReportsMenu(); //how do i do this from thread.

        staThread.SetApartmentState(ApartmentState.STA);
        staThread.Start(args);
        staThread.Join(100);

    }

    public void ReportViewerThread(object args)
    {
        Array argArray = new object[3];
        argArray = (Array) args;
        ReportDocument reportDocument = (ReportDocument) argArray.GetValue(0);
        string reportDesc = (string) argArray.GetValue(1);

          try
            {
                ReportViewerForm form = new ReportViewerForm(reportDocument, reportDesc);
                form.BringToFront();
                form.ShowDialog();
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }

    }

那么我在线程中发布新报告后如何构建“活动报告菜单”。基本上我将遍历ReportThreads列表并将活动报告添加到“Active Reports”菜单项。 ReportThreads列表在主窗口中声明和维护。我可以通过Program.MainWindow访问它。

Answer 1

如果我正确理解您，您想要从另一个主题更改您的表单。为此，您可以使用Invoke方法，如下所示：

Program.MainForm.Invoke(() => Program.MainForm.BuildActiveReportsMenu());

从多个线程访问菜单c＃

1 个答案: