Apply Theme in PowerPoint Presentations using C#

readme.md

Learn how to apply themes in PowerPoint presentations using C#: https://blog.aspose.com/2021/09/16/apply-theme-in-powerpoint-using-csharp/

set-theme-background.cs

using (Presentation pres = new Presentation())
{
    // Check number of styles
    int numberOfBackgroundFills = pres.MasterTheme.FormatScheme.BackgroundFillStyles.Count;
    if (numberOfBackgroundFills > 0)
    {
        // Select a style
        pres.Masters[0].Background.StyleIndex = 1;
    }

    // Save presentation
    pres.Save("theme.pptx", SaveFormat.Pptx);
}

set-theme-color.cs

// Load or create presentation
using (Presentation pres = new Presentation())
{
    // Add shape and set its color
    IAutoShape shape = pres.Slides[0].Shapes.AddAutoShape(ShapeType.Rectangle, 10, 10, 100, 100);
    shape.FillFormat.FillType = FillType.Solid;
    shape.FillFormat.SolidFillColor.SchemeColor = SchemeColor.Accent1;

    // Save presentation
    pres.Save("theme.pptx", SaveFormat.Pptx);
}

set-theme-font.cs

// Load or create presentation
using (Presentation pres = new Presentation())
{
    // Add shape and set its color
    IAutoShape shape = pres.Slides[0].Shapes.AddAutoShape(ShapeType.Rectangle, 10, 10, 100, 100);

    // Add paragraph
    Paragraph paragraph = new Paragraph();
    Portion portion = new Portion("Theme text format");
    paragraph.Portions.Add(portion);
    shape.TextFrame.Paragraphs.Add(paragraph);

    // Set font
    portion.PortionFormat.LatinFont = new FontData("+mn-lt");

    // Save presentation
    pres.Save("theme.pptx", SaveFormat.Pptx);
}