从应用程序打印 (UWP)

Question

我想问一下如何打印我们自己的内容。例如，我们有一些表格，提交表格后，详细信息转到要打印的页面。然后打印。

我使用了来自https://github.com/Microsoft/Windows-universal-samples/blob/master/Samples/Printing/cs的示例。

但是当我尝试打印我的内容时，页面变成了空白页面。

我是 windows phone 开发和 c# 的新手。

Answer 1

official sample 包含许多复杂的打印功能。直接替换样本的某些内容可能效果不佳。我在这里有一个可以满足打印要求的示例演示。并且只需将PrintArea Grid 中的内容替换为您自己的，示例可以打印您的内容。

XAML 代码

<Page.BottomAppBar>
    <CommandBar>
        <AppBarButton x:Name="appbar_Printer"
                      Click="appbar_Printer_Click"
                      Label="printer">       
        </AppBarButton>
    </CommandBar>
</Page.BottomAppBar>

<Grid Background="White" x:Name="PrintArea" >
    <TextBlock HorizontalAlignment="Center"
               VerticalAlignment="Center"
               FontSize="36"
               Foreground="Black"
               Text="Welcome Printed World!" />
</Grid>

后面的代码：

  PrintManager printmgr = PrintManager.GetForCurrentView();        
  PrintDocument printDoc = null;         
  PrintTask task = null; 
  public MainPage()
  {
      this.InitializeComponent(); 
      printmgr.PrintTaskRequested += Printmgr_PrintTaskRequested;
  }
  private void Printmgr_PrintTaskRequested(PrintManager sender, PrintTaskRequestedEventArgs args)
  {  
      var deferral = args.Request.GetDeferral(); 
      task = args.Request.CreatePrintTask("Print", OnPrintTaskSourceRequrested);
      //task.Completed += PrintTask_Completed;
      PrintTaskOptionDetails printDetailedOptions = PrintTaskOptionDetails.GetFromPrintTaskOptions(task.Options);    
      deferral.Complete();
  } 
  //private void PrintTask_Completed(PrintTask sender, PrintTaskCompletedEventArgs args)
  //{
  //    //Completed
  //}
  private async void OnPrintTaskSourceRequrested(PrintTaskSourceRequestedArgs args)
  {
      var def = args.GetDeferral();
      await Dispatcher.RunAsync(Windows.UI.Core.CoreDispatcherPriority.Normal,
        () =>
        { 
            args.SetSource(printDoc?.DocumentSource);
        });
      def.Complete();
  }
  private async void appbar_Printer_Click(object sender, RoutedEventArgs e)
  {
      if (printDoc != null)
      {
          printDoc.GetPreviewPage -= OnGetPreviewPage;
          printDoc.Paginate -= PrintDic_Paginate;
          printDoc.AddPages -= PrintDic_AddPages;
      }
      this.printDoc = new PrintDocument();          
      printDoc.GetPreviewPage += OnGetPreviewPage;        
      printDoc.Paginate += PrintDic_Paginate;   
      printDoc.AddPages += PrintDic_AddPages;        
      bool showPrint = await PrintManager.ShowPrintUIAsync();
  }     
  private void PrintDic_AddPages(object sender, AddPagesEventArgs e)
  { 
      printDoc.AddPage(this);
      printDoc.AddPagesComplete();
  }       
  private void PrintDic_Paginate(object sender, PaginateEventArgs e)
  {
      PrintTaskOptions opt = task.Options;
      PrintTaskOptionDetails printDetailedOptions = PrintTaskOptionDetails.GetFromPrintTaskOptions(e.PrintTaskOptions);
      printDoc.SetPreviewPageCount(1, PreviewPageCountType.Final);
  }
  private void OnGetPreviewPage(object sender, GetPreviewPageEventArgs e)
  {
        printDoc.SetPreviewPage(e.PageNumber, PrintArea); 
  }    

如果您有更多要求，例如需要更多print options，请参考official document以及官方示例。