IDocumentPartSavingCallbackDocumentPartSaving Method

void DocumentPartSaving(
	DocumentPartSavingArgs args
)

Sub DocumentPartSaving ( 
	args As DocumentPartSavingArgs
)

void DocumentPartSaving(
	DocumentPartSavingArgs^ args
)

abstract DocumentPartSaving : 
        args : DocumentPartSavingArgs -> unit 

public void DocumentParts()
{
    // Open a document to be converted to html
    Document doc = new Document(MyDir + "Rendering.docx");
    string outFileName = "SavingCallback.DocumentParts.Rendering.html";

    // We can use an appropriate SaveOptions subclass to customize the conversion process
    HtmlSaveOptions options = new HtmlSaveOptions();

    // We can use it to split a document into smaller parts, in this instance split by section breaks
    // Each part will be saved into a separate file, creating many files during the conversion process instead of just one
    options.DocumentSplitCriteria = DocumentSplitCriteria.SectionBreak;

    // We can set a callback to name each document part file ourselves
    options.DocumentPartSavingCallback = new SavedDocumentPartRename(outFileName, options.DocumentSplitCriteria);

    // If we convert a document that contains images into html, we will end up with one html file which links to several images
    // Each image will be in the form of a file in the local file system
    // There is also a callback that can customize the name and file system location of each image
    options.ImageSavingCallback = new SavedImageRename(outFileName);

    // The DocumentPartSaving() and ImageSaving() methods of our callbacks will be run at this time
    doc.Save(ArtifactsDir + outFileName, options);
}

/// <summary>
/// Renames saved document parts that are produced when an HTML document is saved while being split according to a criteria.
/// </summary>
private class SavedDocumentPartRename : IDocumentPartSavingCallback
{
    public SavedDocumentPartRename(string outFileName, DocumentSplitCriteria documentSplitCriteria)
    {
        mOutFileName = outFileName;
        mDocumentSplitCriteria = documentSplitCriteria;
    }

    void IDocumentPartSavingCallback.DocumentPartSaving(DocumentPartSavingArgs args)
    {
        Assert.True(args.Document.OriginalFileName.EndsWith("Rendering.docx"));

        string partType = "";

        switch (mDocumentSplitCriteria)
        {
            case DocumentSplitCriteria.PageBreak:
                partType = "Page";
                break;
            case DocumentSplitCriteria.ColumnBreak:
                partType = "Column";
                break;
            case DocumentSplitCriteria.SectionBreak:
                partType = "Section";
                break;
            case DocumentSplitCriteria.HeadingParagraph:
                partType = "Paragraph from heading";
                break;
        }

        string partFileName = $"{mOutFileName} part {++mCount}, of type {partType}{Path.GetExtension(args.DocumentPartFileName)}";

        // We can designate the filename and location of each output file either by filename
        args.DocumentPartFileName = partFileName;

        // Or we can make a new stream and choose the location of the file at construction
        args.DocumentPartStream = new FileStream(ArtifactsDir + partFileName, FileMode.Create);
        Assert.True(args.DocumentPartStream.CanWrite);
        Assert.False(args.KeepDocumentPartStreamOpen);
    }

    private int mCount;
    private readonly string mOutFileName;
    private readonly DocumentSplitCriteria mDocumentSplitCriteria;
}

/// <summary>
/// Renames saved images that are produced when an HTML document is saved.
/// </summary>
public class SavedImageRename : IImageSavingCallback
{
    public SavedImageRename(string outFileName)
    {
        mOutFileName = outFileName;
    }

    void IImageSavingCallback.ImageSaving(ImageSavingArgs args)
    {
        // Same filename and stream functions as above in IDocumentPartSavingCallback apply here
        string imageFileName = $"{mOutFileName} shape {++mCount}, of type {args.CurrentShape.ShapeType}{Path.GetExtension(args.ImageFileName)}";

        args.ImageFileName = imageFileName;

        args.ImageStream = new FileStream(ArtifactsDir + imageFileName, FileMode.Create);
        Assert.True(args.ImageStream.CanWrite);
        Assert.True(args.IsImageAvailable);
        Assert.False(args.KeepImageStreamOpen);
    }

    private int mCount;
    private readonly string mOutFileName;
}