首次打印的用戶控件的數據綁定問題

Question

我試圖將用戶控件的頁面打印出來。它工作得很好，除了第一頁

在這裏爲我打印的代碼：

#region Print 
    /// <summary> 
    /// Used the XpsDocumentWriter to write a FixedDocumentSequence which contains the UIElements as single pages 
    /// </summary> 
    /// <param name="xpsWriter"></param> 
    /// <param name="uiElements"></param> 
    private void PrintUIElements(XpsDocumentWriter xpsWriter, List<UIElement> uiElements) 
    { 
     FixedDocumentSequence fixedDocSeq = new FixedDocumentSequence(); 

     foreach (UIElement element in uiElements) 
      (fixedDocSeq as IAddChild).AddChild(toDocumentReference(element)); 

     // write the FixedDocumentSequence as an XPS Document 
     xpsWriter.Write(fixedDocSeq); 
    } 

    /// <summary> 
    /// encapsulater for a UIElement in an DocumentReference 
    /// DocumentReference(FixedDocument(PageContent(FixedPage(UIElement)))) 
    /// to simplify the print of multiple pages 
    /// </summary> 
    /// <param name="uiElement">the UIElement which</param> 
    /// <returns>creates a DocumentReference</returns> 
    private DocumentReference toDocumentReference(UIElement uiElement) 
    { 
     if (uiElement == null) 
      throw new NullReferenceException("the UIElement has to be not null"); 

     FixedPage fixedPage = new FixedPage(); 
     PageContent pageContent = new PageContent(); 
     FixedDocument fixedDoc = new FixedDocument(); 
     DocumentReference docRef = new DocumentReference(); 

     #region Step1 

     // add the UIElement object the FixedPage 
     fixedPage.Children.Add(uiElement); 

     #endregion 

     #region Step2 

     // add the FixedPage to the PageContent collection 
     pageContent.BeginInit(); 
     ((IAddChild)pageContent).AddChild(fixedPage); 
     pageContent.EndInit(); 

     #endregion 

     #region Step 3 

     // add the PageContent to the FixedDocument collection 
     ((IAddChild)fixedDoc).AddChild(pageContent); 

     #endregion 

     #region Step 4 


     // add the FixedDocument to the document reference collection 
     docRef.BeginInit(); 
     docRef.SetDocument(fixedDoc); 
     docRef.EndInit(); 

     #endregion 

     return docRef; 
    } 
    #endregion 

，我使用它像這樣

  var pDialog = new PrintDialog(); 

      if (pDialog.ShowDialog() == true) 
      { 
       List<UIElement> list = new List<UIElement>(); 

       foreach (CostumerVM item in Itemlist.Where(item => item.isChecked == true)) 
       { 
        var vm = new CostumerpageVM(item.VName, item.NName, item.DebNr, item.Original.Id, plan, User.Einrichtungen.refSpeiseplantypId, selectedKW.Key); 
        var window = new PageV{ DataContext = vm }; 
        list.Add(window); 
       } 

       var xpsDocWriter = PrintQueue.CreateXpsDocumentWriter(pDialog.PrintQueue); 
       PrintUIElements(xpsDocWriter, list); 
      } 

比我創建了一個小測試版本來檢查我打印方法和結果是工作正常，所以我想好也許我的LazyLoad是問題，所以我創建了一個初始化方法

// in my CostumerpageVM 
    public void Init() 
    { 
     var properties = this.GetType().GetProperties(); 

     foreach (var p in properties) 
     { 
      if (p.Name != "Item") // is part of the IDataError and it must not be called 
      { var a = p.GetValue(this, null); } 
     } 
    } 

但我仍然面臨同樣的問題，因此，進一步的建議，將不勝感激

我也是媒體鏈接檢查是什麼

• this solution for binding errors（不知道如何在我的情況下實現）
• 添加在我PageV加載事件，這不被調用

Answer 1

確定我意外固定它:)我讀一下關於FixedDocumen後改變了我的打印方法t和我的綁定不再在太空中丟失

/// <summary> 
    /// Used the XpsDocumentWriter to write a FixedDocument which get created and contains the UIElements as single pages 
    /// </summary> 
    /// <param name="xpsWriter">XpsDocumentWriter</param> 
    /// <param name="uiElements">List of UIElement</param> 
    private void PrintUIElements(XpsDocumentWriter xpsWriter, List<UIElement> uiElements) 
    { 
     var fixedDoc = new FixedDocument(); 

     foreach (UIElement element in uiElements) 
     { 
      var fixedPage = new FixedPage(); 
      var pageContent = new PageContent(); 

      // add the UIElement object the FixedPage 
      fixedPage.Children.Add(element); 

      // add the FixedPage object the PageContent 
      pageContent.Child = fixedPage; 

      // add the PageContent object the FixedDocument 
      fixedDoc.Pages.Add(pageContent); 
     } 

     xpsWriter.Write(fixedDoc); 
    }