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The SetProperties is used to update or add metadata. You can easily add metadata to photos, pdfs or you can update or add data to mp3 files. This code sample actually combines two operations: add and update. If an existing property satisfies the specified predicate its value is updated. If there is a known property missing in a metadata package that satisfies the predicate it is added to the appropriate package.

The code snippet below demonstrates a basic usage scenario of the SetProperties method.

1. Open a file to update
2. Specify a predicate that will be used to add/update metadata properties
3. Specify a value you would like to add to existing metadata packages in the file
4. Check the actual number of added/updated properties
5. Save the changes

BasicUsage.SetMetadataProperties

// Constants.InputVsdx is an absolute or relative path to your document. Ex: @"C:\Docs\source.vsdx"
using (Metadata metadata = new Metadata(Constants.InputVsdx))
{
	// Set the value of each property that satisfies the predicate:
	// property contains the date/time the document was created OR modified
	var affected = metadata.SetProperties(
		p => p.Tags.Contains(Tags.Time.Created) || p.Tags.Contains(Tags.Time.Modified),
		new PropertyValue(DateTime.Now));
	Console.WriteLine("Properties set: {0}", affected);
	metadata.Save(Constants.OutputVsdx);
}

As a result, we update all existing metadata properties containing the date the document was created/updated. If a metadata package doesn’t contain such properties but they are meant to be in its structure they are added.

For more information on supported features of the GroupDocs.Metadata search engine please refer to the following articles:

• Extracting metadata
• Removing metadata
• Updating metadata
• Adding metadata

To learn more about document watermarking features and get familiar how to manage watermarks and more, please refer to the advanced usage section.

You may easily run the code above and see the feature in action in our GitHub examples:

• GroupDocs.Metadata for .NET examples
• GroupDocs.Metadata for Java examples

Along with full featured .NET library we provide simple, but powerful free Apps. You are welcome to view and edit metadata of PDF, DOC, DOCX, PPT, PPTX, XLS, XLSX, emails, images and more with our free online Free Online Document Metadata Viewing and Editing App.