Assemble Slides

It covers following below features:

1) Adding Slide to Presentation

Before talking about adding slides to the presentation files, let us discuss some facts about the slides. Each PowerPoint presentation file contains Master / Layout slide and other Normal slides. It means that a presentation file contains at least one or more slides. It is important to know that presentation files without slides are not supported by Aspose.Slides for .NET. Each slide has unique Id and all the Normal Slides are arranged in an order specified by the zero based index.

Aspose.Slides for .NET allows developers to add empty slides to their presentation. To add an empty slide in the presentation, please follow the steps below:

• Create an instance of Presentation class
• Instantiate SlideCollection class by setting a reference to the Slides (collection of content Slide objects) property exposed by the Presentation object.
• Add an empty slide to the presentation at the end of the content slides collection by calling the AddEmptySlide methods exposed by SlideCollection object
• Do some work with the newly added empty slide
• Finally, write the presentation file using the Presentation object

                PresentationEx pres = new PresentationEx();
            
                //Instantiate SlideCollection class
               
                SlideExCollection slds = pres.Slides;
                for (int i = 0; i < pres.LayoutSlides.Count; i++)
                {
                    //Add an empty slide to the Slides collection
                    slds.AddEmptySlide(pres.LayoutSlides[i]);

                }

                //Save the PPTX file to the Disk
                pres.Write("EmptySlide.pptx");

2)Accessing Slides of Presentation:

Aspose.Slides for .NET provides Presentation class that can be used to find and access any desired slide present in the presentation.

Using Slides Collection

Presentation class represents a presentation file and exposes all slides in it as a SlideCollection collection (that is a collection of Slide objects). All of these slides can be accessed from this Slides collection using a slide index.

//Instantiate a Presentation object that represents a presentation file
            PresentationEx pres = new PresentationEx("Slides Test Presentation.pptx");
            //Accessing a slide using its slide index
            SlideEx slide = pres.Slides[0];

3)Removing Slides

We know that Presentation class in Aspose.Slides for .NET represents a presentation file. Presentation class encapsulates a SlideCollection that acts as a repository of all slides that are the part of the presentation. Developers can remove a slide from this Slides collection in two ways:

• Using Slide Reference
• Using Slide Index

Using Slide Reference

To remove a slide using its reference, please follow the steps below:

• Create an instance of Presentation class
• Obtain the reference of a slide by using its Id or Index
• Remove the referenced slide from the presentation
• Write the modified presentation file

 //Instantiate a Presentation object that represents a presentation file
            PresentationEx pres = new PresentationEx("Slides Test Presentation.pptx");
            
                //Accessing a slide using its index in the slides collection
                SlideEx slide = pres.Slides[0];
                //Removing a slide using its reference
                pres.Slides.Remove(slide);

                //Writing the presentation file
                pres.Write("modified.pptx");

4) Changing Position of Slide:

It's very simple to change the position of a slide in the presentation. Just follow the steps below:

• Create an instance of Presentation class
• Obtain the reference of a slide by using its Index
• Change the SlideNumber of the referenced slide
• Write the modified presentation file

In the example given below, we have changed the position of a slide (lying at the zero index position 1) of the presentation) to index 1 (Position 2).

 //Instantiate Presentation class to load the source presentation file
            PresentationEx pres = new PresentationEx(MyDir + "Slides Test Presentation.pptx");
            {
                //Get the slide whose position is to be changed
                SlideEx sld = pres.Slides[0];
                //Set the new position for the slide
                sld.SlideNumber = 2;
                //Write the presentation to disk
                pres.Save("Changed Slide Position Presentation.pptx", SaveFormat.Pptx);
            }
 

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