File Content Extraction 25.2
Filter SDK .NET Programming Guide

# Metadata Examples

If you want to process both standardized and non-standardized metadata elements, you can iterate over metadata elements without checking an element's standard key – both standardized and non-standardized metadata can be handled in the same way. However, standardization provides a way to handle common types of metadata - using the same code for all file formats. Below is an illustrative example.

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    // Open a document
    using (Document myDocument = session.Open(inputFilePath))
    using (Metadata metadata = myDocument.Metadata())
    {
        // Iterate over metadata fields
        foreach (MetadataElement element in metadata) using (element)
        {
            // Skip non-standardized fields
            if (element.StandardKey == MetadataKey.Other)
            {
                continue;
            }

            // Do something specific with the standardized Word Count field
            if (element.StandardKey == MetadataKey.WordCount)
            {
                // Do something with the word count
            }

            // General processing for all standard fields
        }
    }

The following example demonstrates how to take advantage of field standardization, but also avoid processing a metadata field more than once.

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    using (Metadata metadata = myDocument.Metadata())
    {
        // Iterate over metadata fields
        foreach (MetadataElement element in metadata) using (element)
        {
            // Process standardized elements where possible but also process
            // non-standard elements that have no standardized alternative.
            // Ignore duplicate elements output for backwards compatibility.

            if (!element.HasStandardAlternative && !element.IsSuperseded)
            {
                // process element
            }
        }
    }

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Version 25.2 | Last updated April 2025

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Product: File Content Extraction 25.2

Topic Title: Metadata Examples