我在这个问题上苦苦挣扎了很长时间 - 在 UWP 中自动、编程的 XAML 到 PDF 的转换 - 最后找到了一个很好的解决方案。
有几个库可以在 UWP 中以编程方式创建 PDF。诀窍是 XAML 转换。我采取了以下方法：
A) 遍历 XAML 树并生成要转换的控件列表。在我的例子中，文本块和边框，但这可以扩展。
B) 声明与 XAML 的实际大小相匹配的 PDF 页面大小。
C) 遍历列表，获取控件坐标。使用 C1PDF 中的适当函数在 PDF 中创建相同的元素。此代码还检查任何 RotateTransforms 并将旋转角度应用于文本。
使用此解决方案，我能够生成与 XAML UI 完全相似的 XAML UI - 它本身代表一个打印文档 - 作为 PDF，完全可扩展并具有完美的打印呈现。
这里有一些代码可以帮助您使用 ComponentOne PDF 控件，我编写这些代码是为了将 XAML 控件转换为 PDF：
Async Function XAMLtoPDF(myXAMLcontrol As Control) As Task(Of Boolean)
Dim pdf As C1PdfDocument
pdf = New C1PdfDocument(PaperKind.Letter)
Dim lTB As New List(Of Object)
pdf.PageSize = New Size(myXAMLcontrol.ActualWidth, myXAMLcontrol.ActualHeight)
FindTextBlocks(myXAMLcontrol, lTB)
For x = 0 To lTB.Count - 1
If TypeOf lTB(x) Is TextBlock Then
Dim TB As TextBlock = lTB(x)
Dim obj As FrameworkElement = TB
Dim angle As Double = 0
Do While obj IsNot Nothing
Dim renderxform As Transform = obj.RenderTransform
If TypeOf renderxform Is TransformGroup Then
Dim tg As TransformGroup = CType(renderxform, TransformGroup)
For Each t As Transform In tg.Children
If TypeOf t Is RotateTransform Then
angle -= CType(t, RotateTransform).Angle
End If
Next
ElseIf TypeOf renderxform Is RotateTransform Then
angle -= CType(renderxform, RotateTransform).Angle
End If
obj = obj.Parent
Loop
Dim myfont As Font
Select Case TB.FontStyle
Case FontStyle.Normal
If TB.FontWeight.Weight = FontWeights.Bold.Weight Then
myfont = New Font(TB.FontFamily.Source, TB.FontSize, PdfFontStyle.Bold)
Else
myfont = New Font(TB.FontFamily.Source, TB.FontSize, PdfFontStyle.Regular)
End If
Case Else 'FontStyle.Oblique, FontStyle.Italic '
myfont = New Font(TB.FontFamily.Source, TB.FontSize, PdfFontStyle.Italic)
End Select
Dim ttv As GeneralTransform = TB.TransformToVisual(myXAMLcontrol)
Dim ScreenCoords As Point = ttv.TransformPoint(New Point(0, 0))
Dim myWidth As Double, myHeight As Double
If TB.TextWrapping = TextWrapping.NoWrap Then
myWidth = pdf.MeasureString(TB.Text, myfont).Width
myHeight = pdf.MeasureString(TB.Text, myfont).Height
Else
myWidth = TB.ActualWidth + 10 'Admittedly, 10 is a kluge factor to make wrapping match'
myHeight = pdf.MeasureString(TB.Text, myfont, myWidth).Height
End If
Dim rc As New Rect(ScreenCoords.X, ScreenCoords.Y, myWidth, myHeight)
If angle Then
Dim fmt As New StringFormat()
fmt.Angle = angle
pdf.DrawString(TB.Text, myfont, CType(TB.Foreground, SolidColorBrush).Color, rc, fmt)
Else
pdf.DrawString(TB.Text, myfont, CType(TB.Foreground, SolidColorBrush).Color, rc)
End If
ElseIf TypeOf lTB(x) Is Border Then
Dim BDR As Border = lTB(x)
Dim ttv As GeneralTransform = BDR.TransformToVisual(myXAMLcontrol)
Dim ScreenCoords As Point = ttv.TransformPoint(New Point(0, 0))
Dim pts() As Point = {
New Point(ScreenCoords.X, ScreenCoords.Y),
New Point(ScreenCoords.X + BDR.ActualWidth, ScreenCoords.Y),
New Point(ScreenCoords.X + BDR.ActualWidth, ScreenCoords.Y + BDR.ActualHeight),
New Point(ScreenCoords.X, ScreenCoords.Y + BDR.ActualHeight)}
Dim Clr As Color = CType(BDR.BorderBrush, SolidColorBrush).Color
If BDR.BorderThickness.Top Then pdf.DrawLine(New Pen(Clr, BDR.BorderThickness.Top), pts(0), pts(1))
If BDR.BorderThickness.Right Then pdf.DrawLine(New Pen(Clr, BDR.BorderThickness.Right), pts(1), pts(2))
If BDR.BorderThickness.Bottom Then pdf.DrawLine(New Pen(Clr, BDR.BorderThickness.Bottom), pts(2), pts(3))
If BDR.BorderThickness.Left Then pdf.DrawLine(New Pen(Clr, BDR.BorderThickness.Left), pts(3), pts(0))
ElseIf TypeOf lTB(x) Is Rectangle Then
Dim Rect As Rectangle = lTB(x)
Dim ttv As GeneralTransform = Rect.TransformToVisual(myXAMLcontrol)
Dim ScreenCoords As Point = ttv.TransformPoint(New Point(0, 0))
Dim pts() As Point = {
New Point(ScreenCoords.X + Rect.Margin.Left, ScreenCoords.Y + Rect.Margin.Top),
New Point(ScreenCoords.X + Rect.ActualWidth - Rect.Margin.Right, ScreenCoords.Y + Rect.Margin.Top),
New Point(ScreenCoords.X + Rect.ActualWidth - Rect.Margin.Right, ScreenCoords.Y + Rect.ActualHeight - Rect.Margin.Bottom),
New Point(ScreenCoords.X + Rect.Margin.Left, ScreenCoords.Y + Rect.ActualHeight - Rect.Margin.Bottom)}
Dim MyPen1 As New Pen(CType(Rect.Stroke, SolidColorBrush).Color, Rect.StrokeThickness)
MyPen1.DashStyle = DashStyle.Custom
MyPen1.DashPattern = Rect.StrokeDashArray.ToArray
Dim MyPen2 As New Pen(CType(Rect.Stroke, SolidColorBrush).Color, Rect.StrokeThickness)
MyPen2.DashStyle = DashStyle.Custom
MyPen2.DashPattern = Rect.StrokeDashArray.ToArray
pdf.DrawLine(MyPen2, pts(0), pts(1))
pdf.DrawLine(MyPen1, pts(1), pts(2))
pdf.DrawLine(MyPen2, pts(2), pts(3))
pdf.DrawLine(MyPen1, pts(3), pts(0))
End If
Next
Dim file As StorageFile = Await ThisApp.AppStorageFolder.CreateFileAsync("Temp.PDF", Windows.Storage.CreationCollisionOption.ReplaceExisting)
Await pdf.SaveAsync(file)
Return True
End Function
Private Sub FindTextBlocks(uiElement As Object, foundOnes As IList(Of Object))
If TypeOf uiElement Is TextBlock Then
Dim uiElementAsTextBlock = DirectCast(uiElement, TextBlock)
If uiElementAsTextBlock.Visibility = Visibility.Visible Then
foundOnes.Add(uiElementAsTextBlock)
End If
ElseIf TypeOf uiElement Is Panel Then
Dim uiElementAsCollection = DirectCast(uiElement, Panel)
If uiElementAsCollection.Visibility = Visibility.Visible Then
For Each element In uiElementAsCollection.Children
FindTextBlocks(element, foundOnes)
Next
End If
ElseIf TypeOf uiElement Is UserControl Then
Dim uiElementAsUserControl = DirectCast(uiElement, UserControl)
If uiElementAsUserControl.Visibility = Visibility.Visible Then
FindTextBlocks(uiElementAsUserControl.Content, foundOnes)
End If
ElseIf TypeOf uiElement Is ContentControl Then
Dim uiElementAsContentControl = DirectCast(uiElement, ContentControl)
If uiElementAsContentControl.Visibility = Visibility.Visible Then
FindTextBlocks(uiElementAsContentControl.Content, foundOnes)
End If
ElseIf TypeOf uiElement Is Border Then
Dim uiElementAsBorder = DirectCast(uiElement, Border)
If uiElementAsBorder.Visibility = Visibility.Visible Then
foundOnes.Add(uiElementAsBorder)
FindTextBlocks(uiElementAsBorder.Child, foundOnes)
End If
ElseIf TypeOf uiElement Is Rectangle Then
Dim uiElementAsRectangle = DirectCast(uiElement, Rectangle)
foundOnes.Add(uiElementAsRectangle)
End If
End Sub
实际结果：