c# – 如何在XPSDocument中使用WriteAsync?
作者:互联网
我的代码有问题,
XpsDocument doc = new XpsDocument(_filePath, FileAccess.Read);
XpsDocument = doc.GetFixedDocumentSequence();
...
var writer = PrintQueue.CreateXpsDocumentWriter(pq);
var paginator = XpsDocument.DocumentPaginator;
writer.WritingCancelled += WriterOnWritingCancelled;
writer.WritingCompleted += WriterOnWritingCompleted;
writer.WritingPrintTicketRequired += WriterOnWritingPrintTicketRequired;
writer.WriteAsync(paginator);
如果我用Write(paginator)替换最后一个Ligne,一切都还可以,但如果我使用write async,我会得到一个,
FixedPage cannot contain another FixedPage.
WriterOnWritingCompleted中的错误;
我发现article.但我真的不知道如何处理那个超载.
解决方法:
你可以尝试这个code:
private void WriteUsingAsync (
string XPSDocFileName, object FixedDocFromApplication)
{
// create a new XPS Document for output
// note that AsyncXpsDoc is a property defined in the
// class containing this method.
AsyncXpsDoc = new XpsDocument(XPSDocFileName,
FileAccess.ReadWrite);
// create a doc writer object based on the open XPS Document
XpsDocumentWriter XpsDocWrtr =
XpsDocument.CreateXpsDocumentWriter(AsyncXpsDoc);
// register the writing completed event handler
XpsDocWrtr.WritingCompleted +=
new WritingCompletedEventHandler(AsyncPrintCompleted);
XpsDocWrtr.WriteAsync((FixedDocument)FixedDocFromApplication);
return;
}
// Completion Event Handler
private void AsyncPrintCompleted(
object sender, WritingCompletedEventArgs e)
{
if ((e.Cancelled) || (e.Error != null))
//document not written
else
// Asynchronous operation Completed
AsyncXpsDoc.Close();
AsyncXpsDoc = null;
}
并检查您是否以正确的方式创建了fixedDocument,like:
var fd = new FixedDocument();
fd.DocumentPaginator.PageSize = new Size(pd.PrintableAreaWidth,fd.PrintableAreaHeight);
FixedPage page1 = new FixedPage();
page1.Width = fd.DocumentPaginator.PageSize.Width;
page1.Height = fd.DocumentPaginator.PageSize.Height;
UIElement page1Text = pages();
page1.Children.Add(page1Text);
PageContent page1Content = new PageContent();
((IAddChild)page1Content).AddChild(page1);
fd.Pages.Add(page1Content);
private UIElement pages()
{
Canvas pcan = new Canvas();
TextBlock page1Text = new TextBlock();
page1Text.Text = "This is a test";
page1Text.FontSize = 40;
page1Text.Margin = new Thickness(96);
pcan.Children.Add(page1Text);
return pcan;
}
标签:c,asynchronous,net,printing,xps 来源: https://codeday.me/bug/20190703/1362240.html