MetadataUpdateProperties Method
Updates known metadata properties satisfying the specified predicate. The operation is recursive so it affects all nested packages as well.

Namespace: GroupDocs.Metadata
Assembly: GroupDocs.Metadata (in GroupDocs.Metadata.dll) Version: 21.8
Syntax
public int UpdateProperties(
	Func<MetadataProperty, bool> predicate,
	PropertyValue value
)

Parameters

predicate
Type: GroupDocs.Metadata.CommonFuncMetadataProperty, Boolean
A function to test each metadata property for a condition.
value
Type: GroupDocs.Metadata.CommonPropertyValue
A new value for the filtered properties.

Return Value

Type: Int32
The number of affected properties.
Remarks
Please note that GroupDocs.Metadata implicitly checks the type of each filtered property. It's impossible to update a property with a value having an inappropriate type.

Learn more

Examples
C#
using (Metadata metadata = new Metadata(Constants.InputXlsx))
{
    if (metadata.FileFormat != FileFormat.Unknown && !metadata.GetDocumentInfo().IsEncrypted)
    {
        // Update the file creation date/time if the existing value is older than 3 days
        var affected = metadata.UpdateProperties(p => p.Tags.Contains(Tags.Time.Created) &&
                p.Value.Type == MetadataPropertyType.DateTime &&
                p.Value.ToStruct<DateTime>() < threeDaysAgo, new PropertyValue(today));

        Console.WriteLine("Affected properties: {0}", affected);

        metadata.Save(Constants.OutputXlsx);
    }
}
See Also