如何获得并等待外部过程完成？

问题描述

我重写了一个分页器，以显示文档的页眉和页脚。在我将其另存为xps Document之前，一切似乎都可以正常工作：

        public void SaveAsXps(string fileName,FlowDocument document,string DocumentTitle,string DocumentFooter)
    {
        document.PageHeight = 1122.5 - 30;
        document.PageWidth = 793.7 - 30;

        using (Package container = Package.Open(fileName + ".xps",FileMode.Create))
        {
            using (XpsDocument xpsDoc = new XpsDocument(container,Compressionoption.Maximum))
            {
                XpsSerializationManager rsm = new XpsSerializationManager(new XpsPackagingPolicy(xpsDoc),false);

                DocumentPaginator paginator = ((IDocumentPaginatorSource)document).DocumentPaginator;

                paginator = new VisualPaginator(paginator,new Size(793.7,1122.5),new Size(30,30),DocumentTitle,DocumentFooter);
                rsm.SaveAsXaml(paginator);
            }
        }

}

我给你分页器：

 public class VisualPaginator : DocumentPaginator
{

    string m_DocumentTitle;
    string m_DocumentFooter;
    private Size pageSize;
    private Size margin;
    private readonly DocumentPaginator paginator;
    private Typeface typeface;

    public override Size PageSize
    {
        get { return pageSize; }
        set { pageSize = value; }
    }
    public override bool IsPageCountValid
    {
        get
        {
            return paginator.IsPageCountValid;
        }
    }
    public override int PageCount
    {
        get
        {
            return paginator.PageCount;
        }
    }
    public override IDocumentPaginatorSource Source
    {
        get
        {
            return paginator.source;
        }
    }

    public VisualPaginator(DocumentPaginator paginator,Size pageSize,Size margin,string DocumentFooter)
    {
        PageSize = pageSize;
        this.margin = margin;
        this.paginator = paginator;
        m_DocumentTitle = DocumentTitle;
        m_DocumentFooter = DocumentFooter;

        this.paginator.PageSize = new Size(PageSize.Width - margin.Width * 2,PageSize.Height - margin.Height * 2);
    }

    public void DrawFunction(DrawingVisual content,string drawContent,Point point)
    {
        try
        {
            using (DrawingContext ctx = content.Renderopen())
            {
                if (typeface == null)
                {
                    typeface = new Typeface("Times New Roman");
                }

                FormattedText text = new FormattedText(drawContent,CultureInfo.CurrentCulture,FlowDirection.LeftToRight,typeface,14,Brushes.Black,VisualTreeHelper.GetDpi(content).PixelsPerDip);

                Thread.Sleep(300);

                ctx.DrawText(text,point);
            }
        }
        catch (Exception)
        {
            throw;
        }
    }


    public override DocumentPage GetPage(int pageNumber)
    {

        DocumentPage page = paginator.GetPage(pageNumber);

        // Create a wrapper visual for transformation and add extras
        ContainerVisual newpage = new ContainerVisual();
        //Title
        DrawingVisual pagetitle = new DrawingVisual();

        DrawFunction(pagetitle,m_DocumentTitle,new Point(paginator.PageSize.Width / 2 - 100,-96 / 4));
                  
        //Page Number
        DrawingVisual pagenumber = new DrawingVisual();

        DrawFunction(pagenumber,"Page " + (pageNumber + 1),new Point(paginator.PageSize.Width - 200,paginator.PageSize.Height - 100));
                   
        //Footer
        DrawingVisual pagefooter = new DrawingVisual();

        DrawFunction(pagefooter,m_DocumentFooter,paginator.PageSize.Height - 100));

        DrawingVisual background = new DrawingVisual();

        using (DrawingContext ctx = background.Renderopen())
        {
            ctx.DrawRectangle(new SolidColorBrush(Color.Fromrgb(240,240,240)),null,page.ContentBox);
        }

        newpage.Children.Add(background); // Scale down page and center

        ContainerVisual smallerPage = new ContainerVisual();
        smallerPage.Children.Add(page.Visual);
        //smallerPage.Transform = new MatrixTransform(0.95,0.95,//    0.025 * page.ContentBox.Width,0.025 * page.ContentBox.Height);

        newpage.Children.Add(smallerPage);
        newpage.Children.Add(pagetitle);
        newpage.Children.Add(pagenumber);
        newpage.Children.Add(pagefooter);

        newpage.Transform = new TranslateTransform(margin.Width,margin.Height);

        return new DocumentPage(newpage,PageSize,page.BleedBox,page.ContentBox);
    }
}

除非我使用Thread.Sleep（300）指令，否则代码执行会由于外部过程而导致断点。我认为程序必须等待一些外部过程完成，但是我不知道这里涉及哪些过程，我可以做些什么来等待它们解决问题，而无需使用Thread.Sleep（），这是非常糟糕的做法

任何帮助或线索都将不胜感激。

解决方法

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