Presentation Properties
About Presentation Properties
As we have described earlier that Aspose.Slides for .NET supports two kinds of document properties, which are Built-in and Custom properties. So, developers can access both kinds of properties with the use of Aspose.Slides for .NET API. Aspose.Slides for .NET provides a class IDocumentProperties that represents the document properties associated with a presentation file through Presentation.DocumentProperties property. Developers can use IDocumentProperties property exposed by Presentation object to access the document properties of the presentation files as described below:
Manage Presentation Properties
Microsoft PowerPoint provides a feature to add some properties to the presentation files. These document properties allow some useful information to be stored along with the documents (presentation files). There are two kinds of document properties as follows
- System Defined (Built-in) Properties
- User Defined (Custom) Properties
Built-in properties contain general information about the document like document title, author’s name, document statistics and so on. Custom properties are those ones, which are defined by the users as Name/Value pairs, where both name and value are defined by the user. Using Aspose.Slides for .NET, developers can access and modify the values of built-in properties as well as custom properties. Microsoft PowerPoint 2007 allows managing the document properties of the presentation files. All you have to do is to click the Office icon and further Prepare | Properties | Advanced Properties menu item of the Microsoft PowerPoint 2007. After you select Advanced Properties menu item, a dialog would appear allowing you to manage the document properties of the PowerPoint file. In the Properties Dialog, you can see that there are many tab pages like General, Summary, Statistics, Contents and Custom. All these tab pages allow configuring different kinds of information related to the PowerPoint files. Custom tab is used to manage the custom properties of the PowerPoint files.
Access Built-in Properties
These properties as exposed by IDocumentProperties object include: Creator(Author), Description, Keywords Created (Creation Date), Modified Modification Date, Printed Last Print Date, LastModifiedBy, Keywords, SharedDoc (Is shared between different producers?), PresentationFormat, Subject and Title
Modify Built-in Properties
Modifying the built-in properties of presentation files is as easy as that of accessing them. You can simply assign a string value to any desired property and the property value would be modified. In the example given below, we have demonstrated that how we can modify the built-in document properties of the presentation file.
Add Custom Presentation Properties
Aspose.Slides for .NET also allows developers to add the custom the values for presentation Document properties. An example is given below that shows how to set the custom properties for a presentation.
Access and Modify Custom Properties
Aspose.Slides for .NET also allows developers to access the values of custom properties. An example is given below that shows how can you access and modify all of these custom properties for a presentation.
Set Proofing Language
Aspose.Slides provides the LanguageId property (exposed by the PortionFormat class) to allow you to set the proofing language for a PowerPoint document. The proofing language is the language for which spellings and grammar in the PowerPoint are checked.
This C# code shows you how to set the proofing language for a PowerPoint:
using (Presentation pres = new Presentation(pptxFileName))
{
AutoShape autoShape = (AutoShape)pres.Slides[0].Shapes[0];
IParagraph paragraph = autoShape.TextFrame.Paragraphs[0];
paragraph.Portions.Clear();
Portion newPortion = new Portion();
IFontData font = new FontData("SimSun");
IPortionFormat portionFormat = newPortion.PortionFormat;
portionFormat.ComplexScriptFont = font;
portionFormat.EastAsianFont = font;
portionFormat.LatinFont = font;
portionFormat.LanguageId = "zh-CN"; // set the Id of a proofing language
newPortion.Text = "1。";
paragraph.Portions.Add(newPortion);
}
Set Default Language
This C# code shows you how to set the default language for an entire PowerPoint presentation:
LoadOptions loadOptions = new LoadOptions();
loadOptions.DefaultTextLanguage = "en-US";
using (Presentation pres = new Presentation(loadOptions))
{
// Adds a new rectangle shape with text
IAutoShape shp = pres.Slides[0].Shapes.AddAutoShape(ShapeType.Rectangle, 50, 50, 150, 50);
shp.TextFrame.Text = "New Text";
// Checks the first portion language
Console.WriteLine(shp.TextFrame.Paragraphs[0].Portions[0].PortionFormat.LanguageId);
}
Live Example
Try Aspose.Slides Metadata online app to see how to work with document properties via Aspose.Slides API:
