ICssSavingCallback Interface

Implement this interface if you want to control how Aspose.Words saves CSS (Cascading Style Sheet) when saving a document to HTML.

Namespace:  Aspose.Words.Saving
Assembly:  Aspose.Words (in Aspose.Words.dll) Version: 21.5.0


public interface ICssSavingCallback

The ICssSavingCallback type exposes the following members.


Public methodCode exampleCssSaving
Called when Aspose.Words saves an CSS (Cascading Style Sheet).


Shows how to work with CSS stylesheets that an HTML conversion creates.
public void ExternalCssFilenames()
    Document doc = new Document(MyDir + "Rendering.docx");

    // Create an "HtmlFixedSaveOptions" object, which we can pass to the document's "Save" method
    // to modify how we convert the document to HTML.
    HtmlSaveOptions options = new HtmlSaveOptions();

    // Set the "CssStylesheetType" property to "CssStyleSheetType.External" to
    // accompany a saved HTML document with an external CSS stylesheet file.
    options.CssStyleSheetType = CssStyleSheetType.External;

    // Below are two ways of specifying directories and filenames for output CSS stylesheets.
    // 1 -  Use the "CssStyleSheetFileName" property to assign a filename to our stylesheet:
    options.CssStyleSheetFileName = ArtifactsDir + "SavingCallback.ExternalCssFilenames.css";

    // 2 -  Use a custom callback to name our stylesheet:
    options.CssSavingCallback =
        new CustomCssSavingCallback(ArtifactsDir + "SavingCallback.ExternalCssFilenames.css", true, false);

    doc.Save(ArtifactsDir + "SavingCallback.ExternalCssFilenames.html", options);

/// <summary>
/// Sets a custom filename, along with other parameters for an external CSS stylesheet.
/// </summary>
private class CustomCssSavingCallback : ICssSavingCallback
    public CustomCssSavingCallback(string cssDocFilename, bool isExportNeeded, bool keepCssStreamOpen)
        mCssTextFileName = cssDocFilename;
        mIsExportNeeded = isExportNeeded;
        mKeepCssStreamOpen = keepCssStreamOpen;

    public void CssSaving(CssSavingArgs args)
        // We can access the entire source document via the "Document" property.

        args.CssStream = new FileStream(mCssTextFileName, FileMode.Create);
        args.IsExportNeeded = mIsExportNeeded;
        args.KeepCssStreamOpen = mKeepCssStreamOpen;


    private readonly string mCssTextFileName;
    private readonly bool mIsExportNeeded;
    private readonly bool mKeepCssStreamOpen;

ExpandedSee Also