Add custom document properties
Overview
Add application-specific metadata as custom name/value properties. You can list the properties, read their values, update them or remove ones that are no longer needed. Typed values help keep a document identifier, report date or workflow flag with the file.
Usage example (C#)
Install Aspose.Slides for .NET before running this standalone example. Store a string, number, date and Boolean as named metadata. Remove a temporary field before saving, leaving the four typed fields in source.pptx.
using System;
using Aspose.Slides;
using Aspose.Slides.Export;
using var presentation = new Presentation();
var shape = presentation.Slides[0].Shapes.AddAutoShape(ShapeType.Rectangle, 40, 40, 500, 140);
shape.AddTextFrame("Sample slide");
var properties = presentation.DocumentProperties;
properties["ReportId"] = "Demo-42";
properties["Amount"] = 12.5;
properties["ReportDate"] = new DateTime(2026, 1, 15);
properties["Reviewed"] = true;
properties["Temporary"] = "discard";
properties.RemoveCustomProperty("Temporary");
presentation.Save("source.pptx", SaveFormat.Pptx);
FAQ
Is this suitable for a larger structured XML payload?
For structured XML, use custom XML parts. Custom properties are a simpler choice for individual named values.
Which value types can custom properties hold?
Custom properties can hold supported scalar values such as text, numbers, dates and Boolean flags.
How can I check whether a property exists before adding it?
Check the custom-property names before setting a value; assigning a name that already exists updates its value.
Guides
Related feature: Work with custom XML parts.