Merge PowerPoints in C# | .NET PowerPoint Library

Overview

The Syncfusion .NET PowerPoint Library offers the powerful capability to merge or combine multiple PowerPoint presentations into a single presentation with just a few lines of code in C#, without Microsoft PowerPoint. It also allows for the merging of particular slides from one presentation to another.

How to merge two PowerPoint presentations in C#

Install NuGet package: Install the Syncfusion.Presentation.Net.Core NuGet package in your project.
Open source and destination file: Initialize two IPresentation objects for the passing the FileStream objects.
Clone slides from source presentation: Use the Clone method of the ISlide interface to clone each slide.
Merge to destination: Add each cloned slide to the IPresentation.
Replace text: Iterate through each found text, using the GetAsOneTextPart method to obtain the found text as a single text part, and then replace the text.
Save destination presentation: Save the IPresentation object to the FileStream object.

Here is an example of how to merge two presentations in C# using the Syncfusion .NET PowerPoint Library.

c#
//Open an existing source presentation.
using FileStream sourceStream = new FileStream("SourcePresentation.pptx", FileMode.Open, FileAccess.Read, FileShare.ReadWrite);
using IPresentation sourcePresentation = Presentation.Open(sourceStream);
//Open an existing destination presentation.
using FileStream destinationStream = new FileStream("DestinationPresentation.pptx", FileMode.Open, FileAccess.Read, FileShare.ReadWrite);
using IPresentation destinationPresentation = Presentation.Open(destinationStream);

//Iterate each slide in source and merge to presentation.
for(int i =0;i<sourcePresentation.Slides.Count;i++)
{
    //Clone the slide of the source presentation.
    ISlide clonedSlide = sourcePresentation.Slides[i].Clone();
    //Merge the cloned slide into the destination presentation.
    destinationPresentation.Slides.Add(clonedSlide, PasteOptions.UseDestinationTheme, sourcePresentation);

}
//Save the PowerPoint presentation.
using FileStream outputStream = new FileStream("Result.pptx"), FileMode.Create);
destinationPresentation.Save(outputStream);