流编辑 OpenXml 幻灯片演示文稿幻灯片

Question

我正在尝试使用OpenXml和Streamreader/Streamwriter编辑Powerpoint幻灯片的XML流。

对于 Word 文档，这很容易：

Imports System.IO
Imports DocumentFormat.OpenXml
Imports DocumentFormat.OpenXml.Packaging
Imports DocumentFormat.OpenXml.Presentation
Imports DocumentFormat.OpenXml.Wordprocessing
'  
'
'
' Open a word document
CurrentOpenDocument = WordprocessingDocument.Open(TheWordFileName, True)
' for a word document, this works
Using (CurrentOpenDocument)
    ' read the xml stream
    Dim sr As StreamReader = New StreamReader(CurrentOpenDocument.MainDocumentPart.GetStream)
    docText = sr.ReadToEnd
    ' do the substitutions here
    docText = DoSubstitutions(docText)
    ' write the modified xml stream
    Dim sw As StreamWriter = New StreamWriter(CurrentOpenDocument.MainDocumentPart.GetStream(FileMode.Create))
    Using (sw)
        sw.Write(docText)
    End Using
End Using

但是对于Powerpoint(演示文稿(，我发现插入的幻灯片部分的修改XML流没有保存：

Imports System.IO
Imports DocumentFormat.OpenXml
Imports DocumentFormat.OpenXml.Packaging
Imports DocumentFormat.OpenXml.Presentation
Imports DocumentFormat.OpenXml.Wordprocessing
'                    
'
' Open a powerpoint presentation 
CurrentOpenPresentation = PresentationDocument.Open(ThePowerpointFileName, True)
' for a powerpoint presentation, this doesn't work
Using (CurrentOpenPresentation)
    ' Get the presentation part of the presentation document.
    Dim pPart As PresentationPart = CurrentOpenPresentation.PresentationPart
    ' Verify that the presentation part and presentation exist.
    If pPart IsNot Nothing AndAlso pPart.Presentation IsNot Nothing Then
        ' Get the Presentation object from the presentation part.
        Dim pres As Presentation = pPart.Presentation
        ' Verify that the slide ID list exists.
        If pres.SlideIdList IsNot Nothing Then
            ' Get the collection of slide IDs from the slide ID list.
            Dim slideIds = pres.SlideIdList.ChildElements
            ' loop through each slide
            For Each sID In slideIds
                Dim slidePartRelationshipId As String = (TryCast(sID, SlideId)).RelationshipId
                Dim TheslidePart As SlidePart = CType(pPart.GetPartById(slidePartRelationshipId), SlidePart)
                ' If the slide exists...
                If TheslidePart.Slide IsNot Nothing Then
                    Dim sr As StreamReader = New StreamReader(TheslidePart.GetStream)
                    Using (sr)
                        docText = sr.ReadToEnd
                    End Using
                    docText = DoSubstitutions(docText)
                    Dim sw As StreamWriter = New StreamWriter(TheslidePart.GetStream(FileMode.Create))
                    Using (sw)
                        sw.Write(docText)
                    End Using
                End If
            Next
    End If
End Using

我还尝试遍历内存中的幻灯片部分以检查 XML 流，它们已更改。

只是这永远不会在处置(最终使用(中保存回文件，并且不会引发错误异常。

还有其他人经历过吗？

Answer 1

经过大约一周的混乱，我找到了答案。它是引用集合中的幻灯片部分，而不是通过关系 Id 引用，尽管我不知道为什么这有效，并且初始方法不起作用：

' This DOES work
Using (CurrentOpenPresentation)
    ' Get the presentation part of the presentation document.
    Dim pPart As PresentationPart = CurrentOpenPresentation.PresentationPart
    ' Verify that the presentation part and presentation exist.
    If pPart IsNot Nothing AndAlso pPart.Presentation IsNot Nothing Then
        ' reference each slide in turn and do the Substitution
        For Each s In pPart.SlideParts
            Dim sr As StreamReader = New StreamReader(s.GetStream)
            Using (sr)
                docText = sr.ReadToEnd
            End Using
            docText = DoSubstitutions(docText)
            Dim sw As StreamWriter = New StreamWriter(s.GetStream(FileMode.Create))
            Using (sw)
                sw.Write(docText)
            End Using
        Next
    End If
End Using