How to edit the text of an existing slide and the alt text of an image in PowerPoint Presentation?
Syncfusion® Presentation is a .NET PowerPoint Library used to create, read, edit and convert PowerPoint files to PDF and images programmatically without Microsoft Office or interop dependencies. Using this library, you can edit the text of an existing slide and the alt text of an image in PowerPoint Presentation using C#.
Steps to edit the text of an existing slide and the alt text of an image in PowerPoint Presentation:
- Create a new C# Console application project
- Install the Syncfusion.Presentation.Net.Core NuGet package as a reference to your project from Nuget.org.
Starting with v16.2.0.x, if you reference Syncfusion® assemblies from trial setup or from the NuGet feed, include a license key in your projects. Refer to the link to learn about generating and registering a Syncfusion® license key in your application to use the components without trail message.
- Include the following namespace in the Program.cs file.
C#
using Syncfusion.Presentation;
- Use the following code example to edit the text of an existing slide and the alt text of an image in Powerpoint.
C#
//Load or open an PowerPoint Presentation.
using FileStream inputStream = new(Path.GetFullPath(@"Data/Template.pptx"), FileMode.Open, FileAccess.Read, FileShare.ReadWrite);
//Open an existing PowerPoint presentation.
using IPresentation pptxDoc = Presentation.Open(inputStream);
//Retrieve the slide instance.
ISlide slide = pptxDoc.Slides[0];
//Retrieves the first shape.
IShape shape = slide.Shapes[0] as IShape;
//Retrieves the first paragraph of the shape.
IParagraph paragraph = shape.TextBody.Paragraphs[0];
//Retrieves the first TextPart of the shape.
ITextPart textPart = paragraph.TextParts[0];
//Modifies the text content of the TextPart.
textPart.Text = "Hello Presentation";
//Retrieve the first picture from the slide.
IPicture picture = slide.Pictures[0];
//Modifies the label of the image.
picture.Description = "Replaced alt text";
//Saves the modified PowerPoint Presentation.
using FileStream outputStream = new(Path.GetFullPath(@"Output/Result.pptx"), FileMode.Create, FileAccess.ReadWrite);
pptxDoc.Save(outputStream);
You can download a complete working sample to edit the text of an existing slide and the alt text of an image in PowerPoint Presentation from GitHub.
By executing the program, you will get the PowerPoint Presentation as follows.
Take a moment to peruse the documentation, where you can find basic presentation document processing options along with features like clone and merge slides and encrypt and decrypt PowerPoint presentation and most importantly PDF and image conversion with code examples.
Explore more about the rich set of Syncfusion® PowerPoint Framework features.
Conclusion
I hope you enjoyed learning how to edit the text of an existing slide and the alt text of an image in PowerPoint Presentation.
You can refer to our .NET PowerPoint Library feature tour page to know about its other groundbreaking feature representations and documentation, and how to quickly get started for configuration specifications.
For current customers, you can check out our components from the License and Downloads page. If you are new to Syncfusion®, you can try our 30-day free trial to check out our other controls.
If you have any queries or require clarifications, please let us know in the comments section below. You can also contact us through our support forums, Direct-Trac, or feedback portal. We are always happy to assist you!
