Save Presentation in .NET

Save Presentation

Opening a Presentation described how to use the Presentation class to open a presentation. This article explains how to create and save presentations. The Presentation class holds a presentation’s content. Whether creating a presentation from scratch or modifying an existing one, when finished, you want to save the presentation. With Aspose.Slides for .NET, it can be saved as a file or stream. This article explains how to save a presentation in different ways:

Saving Presentation to Files

Save a presentation to files by calling the Presentation class Save method. Simply pass the file name and save format to the Save method. The examples that follow show how to save a presentation with Aspose.Slides for .NET using C#.

// Instantiate a Presentation object that represents a PPT file
Presentation presentation= new Presentation();

//...do some work here...

// Save your presentation to a file
presentation.Save("Saved_out.pptx", Aspose.Slides.Export.SaveFormat.Pptx);

Saving Presentation to Streams

It is possible to save a presentation to a stream by passing an output stream to the  Presentation class Save method. There are many types of streams to which a presentation can be saved. In the below example we have created a new Presentation file, add text in shape and Save the presentation to the stream.

// Instantiate a Presentation object that represents a PPT file
using (Presentation presentation = new Presentation())
{

    IAutoShape shape = presentation.Slides[0].Shapes.AddAutoShape(ShapeType.Rectangle, 200, 200, 200, 200);

    // Add text to shape
    shape.TextFrame.Text = "This demo shows how to Create PowerPoint file and save it to Stream.";

    FileStream toStream = new FileStream("Save_As_Stream_out.pptx", FileMode.Create);
    presentation.Save(toStream, Aspose.Slides.Export.SaveFormat.Pptx);
    toStream.Close();
}

Saving Presentations with Predefined View Type

Aspose.Slides for .NET provides a facility to set the view type for the generated presentation when it is opened in PowerPoint through the ViewProperties class. The LastView property is used to set the view type by using the ViewType enumerator.

using (Presentation pres = new Presentation())
{
    pres.ViewProperties.LastView = ViewType.SlideMasterView;
    pres.Save("pres-will-open-SlideMasterView.pptx", SaveFormat.Pptx);
}

Saving Presentations to Strict Office Open XML Format

Aspose.Slides allows you to save the presentation in Strict Office Open XML format. For that purpose, it provides the Aspose.Slides.Export.PptxOptions class where you can set the Conformance property, while saving the presentation file. If you set its value as Conformance.Iso29500_2008_Strict, then the output presentation file will be saved in Strict Office Open XML format.

The following sample code creates a presentation and saves it in the Strict Office Open XML Format. While calling the Save method for the presentation, the  Aspose.Slides.Export.PptxOptions object is passed into it with the Conformance property set as Conformance.Iso29500_2008_Strict.

   // Instantiate a Presentation object that represents a presentation file
   using (Presentation presentation = new Presentation())
   {
       // Get the first slide
       ISlide slide = presentation.Slides[0];

       // Add an autoshape of type line
       slide.Shapes.AddAutoShape(ShapeType.Line, 50, 150, 300, 0);

       // Save the presentation to Strict Office Open XML Format
       presentation.Save(dataDir + "NewPresentation_out.pptx", Aspose.Slides.Export.SaveFormat.Pptx,
           new PptxOptions() { Conformance = Conformance.Iso29500_2008_Strict });

   }

Saving Presentations to Office Open XML format in Zip64 mode

An Office Open XML file is a ZIP-archive that has a 4 GB (2^32 bytes) limit on uncompressed size of a file, compressed size of a file, and total size of the archive, as well as a limit of 65,535 (2^16-1) files in the archive. ZIP64 format extensions increase the limits to 2^64.

The new IPptxOptions.Zip64Mode property allows you to choose when to use ZIP64 format extensions for the saved Office Open XML file.

This property provides the following modes:

  • Zip64Mode.IfNecessary means that ZIP64 format extensions will only be used if the presentation falls outside the above limitations. This is the default mode.
  • Zip64Mode.Never means that ZIP64 format extensions will not be used.
  • Zip64Mode.Always means that ZIP64 format extensions will always be used.

The following C# code demonstrates how to save the presentation to PPTX format with ZIP64 format extensions:

using (Presentation pres = new Presentation("Sample.pptx"))
{
    pres.Save("Sample-zip64.pptx", SaveFormat.Pptx, new PptxOptions()
    {
        Zip64Mode = Zip64Mode.Always
    });
}

Saving Progress Updates in Percentage

New IProgressCallback interface has been added to ISaveOptions interface and SaveOptions abstract class. IProgressCallback interface represents a callback object for saving progress updates in percentage.

The following code snippets below shows how to use IProgressCallback interface:

using (Presentation presentation = new Presentation("ConvertToPDF.pptx"))
{
    ISaveOptions saveOptions = new PdfOptions();
    saveOptions.ProgressCallback = new ExportProgressHandler();
    presentation.Save("ConvertToPDF.pdf", SaveFormat.Pdf, saveOptions);
}


class ExportProgressHandler : IProgressCallback
{
    public void Reporting(double progressValue)
    {
        // Use progress percentage value here
        int progress = Convert.ToInt32(progressValue);
        Console.WriteLine(progress + "% file converted");
    }
}

Open and Save Presentation

Steps: Open and Save Presentation in C#

  1. Create an instance of Presentation class with any format i.e. PPT, PPTX, ODP etc.
  2. Save Presentation to any format supported by SaveFormat
// Load any supported file in Presentation e.g. ppt, pptx, odp etc.
Presentation presentation = new Presentation("Sample.odp");

presentation.Save("OutputPresenation.pptx", SaveFormat.Pptx);
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