Aspose.Slides FOSS（.NET 用）
.NET から PowerPoint プレゼンテーションを作成、読み取り、編集できます — 無料でオープンソース、Office への依存は不要です。
PowerPoint プレゼンテーション用のオープンソース .NET ライブラリ
Aspose.Slides FOSS for .NET は、PowerPoint の .pptx ファイルを操作するための MIT ライセンスの純粋な C# ライブラリです。NuGet パッケージを 1 つ追加するだけで、Microsoft Office や任意のプロプライエタリ ランタイムをインストールせずに、プレゼンテーションの作成、読み取り、編集をすぐに開始できます。
このライブラリは、PowerPoint が内部で使用している概念モデルである Presentation、Slide、Shape、TextFrame、Paragraph、Portion を中心とした Presentation API を提供します。スライドの追加・削除、AutoShape、テーブル、コネクタの挿入、太字・斜体・フォントサイズ・色による文字レベルのテキスト書式設定、単色またはグラデーションの塗りつぶしの適用、そして視覚効果（影、グロー、ぼかし、反射）の追加が可能です。
IDisposable パターンにより信頼性の高いリソースのクリーンアップが保証されます。Presentation は必ず using 文でラップしてください。ロード時に遭遇した未知の XML パーツは保存時にそのまま保持されるため、往復処理でライブラリがまだ理解できないコンテンツが破壊されることはありません。このライブラリは .NET 9.0 以降が必要で、コンパイルするためのネイティブ拡張はありません。
Presentation and Slide API
- Create and open PPTX: Create new presentations or open existing
.pptxfiles vianew Presentation()ornew Presentation(file). - Add and remove slides: Programmatically manage the
SlideCollectionwithAddClone(),AddEmptySlide(),Remove(), andRemoveAt(). - AutoShapes: Insert rectangles, ellipses, lines, and other
ShapeTypegeometries viaAddAutoShape(). - Tables and Connectors: Add structured table shapes and connector lines between shapes via
AddConnector(). - Speaker notes: Read and write per-slide speaker notes through
NotesSlideManager. - Threaded comments: Access slide-level comment threads with
GetSlideComments().
Where Aspose.Slides FOSS Can Be Used
- Report generation: Build branded slide decks from data sources without Office.
- Template automation: Fill PPTX templates with dynamic content in CI/CD pipelines.
- Content migration: Read existing presentations and restructure or re-style slides.
- Serverless backends: Process PPTX files inside Docker containers or Azure Functions.
- Batch processing: Apply uniform formatting changes across large slide deck libraries.
Text Formatting and Visual Effects
- Character-level formatting: Apply bold, italic, font size, and color to individual
Portionobjects viaPortionFormat. - Solid and gradient fills: Set shape fill to a solid color or multi-stop linear gradient using
FillFormatandFillType. - Shadow and glow effects: Apply outer shadow, glow, blur, and reflection to any shape via
EffectFormat. - Paragraph alignment: Set left, center, right, or justify alignment per paragraph using
ParagraphFormat.Alignment. - Round-trip safe: Unknown XML parts are preserved verbatim on re-save.
Developer Experience
Aspose.Slides FOSS installs with a single dotnet add package Aspose.Slides.Foss command. The library is pure C# with no native extensions to compile and no system packages to install.
The API mirrors PowerPoint’s own object model (Presentation, Slide, Shape, TextFrame, Paragraph, Portion), so anyone familiar with the PowerPoint object model can use the library immediately. It is MIT-licensed, open-source on GitHub, and requires .NET 9.0 or later.
Create a Presentation and Add a Shape
Use a using statement to ensure the Presentation is always disposed and resources are freed. AddAutoShape() takes a ShapeType enum, then x/y position and width/height in points. Call AddTextFrame() to create the text frame and set the initial text in one call — do not access TextFrame before calling AddTextFrame() as the frame is null until created.
dotnet add package Aspose.Slides.Foss
using Aspose.Slides.Foss;
using var prs = new Presentation();
var slide = prs.Slides[0];
// Add a rectangle AutoShape
var shape = slide.Shapes.AddAutoShape(
ShapeType.Rectangle, 50, 50, 400, 150
);
shape.AddTextFrame("Hello, Aspose.Slides!");
prs.Save("output.pptx", SaveFormat.Pptx);
Format Text and Apply a Fill Effect
Text formatting works at the Portion level — the smallest unit of a run of characters. Open the saved file, navigate to the first portion of the first paragraph, and set font properties directly. Shape fill is independent: set FillType to Solid and assign a color to SolidFillColor.Color.
using Aspose.Slides.Foss;
using Aspose.Slides.Foss.Drawing;
using var prs = new Presentation("output.pptx");
var shape = (IAutoShape)prs.Slides[0].Shapes[0];
var portion = shape.TextFrame.Paragraphs[0].Portions[0];
// Bold, 18pt, dark-blue text
portion.PortionFormat.FontBold = NullableBool.True;
portion.PortionFormat.FontHeight = 18;
portion.PortionFormat.FillFormat.SolidFillColor.Color =
Color.FromArgb(255, 0, 0, 139);
// Solid background fill on the shape
shape.FillFormat.FillType = FillType.Solid;
shape.FillFormat.SolidFillColor.Color =
Color.FromArgb(255, 240, 248, 255);
prs.Save("formatted.pptx", SaveFormat.Pptx);
よくある質問
What is Aspose.Slides FOSS for .NET?
It is a free, MIT-licensed pure-C# library for creating, reading, and editing PowerPoint .pptx presentations without requiring Microsoft Office.
Which file formats are supported?
PPTX is the supported read/write format. Export to PDF, HTML, SVG, or images is not available in this edition.
Does it require Microsoft Office or PowerPoint?
No. Aspose.Slides FOSS is a pure-C# library with no dependency on Microsoft Office, COM automation, or any proprietary runtime.
How do I install it?
Run dotnet add package Aspose.Slides.Foss. The library requires .NET 9.0 or later. There are no native extensions to compile.
Can I apply visual effects like shadow and glow?
Yes. The library supports outer shadow, glow, blur, and reflection effects on any shape object via the EffectFormat API.
Is the IDisposable pattern recommended?
Yes. Always wrap a Presentation in a using statement (using var prs = new Presentation();) to ensure reliable resource cleanup.
Will round-tripping a PPTX destroy unknown content?
No. Unknown XML parts encountered during load are preserved verbatim on save, so content the library does not yet understand is never lost.
Where can I find the source code?
The library is MIT-licensed and hosted on GitHub. Bug reports and pull requests are welcome.
