.NET API for Metadata Processing

This .NET API can be consumed to integrate metadata viewer, editor, reader, writer, and remover operations within your .NET apps.

View, Edit & Update Document Metadata

Read, update and remove metadata in a variety of formats.
Search, update and remove particular metadata properties as per specified predicate.
Use tags to easily manipulate most common metadata properties in a unified manner.
Work with password-protected documents.
Extract information about hidden document pages, digital signatures, user comments, revisions, etc.
Supports many popular metadata standards, such as, IPTC, XMP, EXIF, Image Resources.
Manipulate native metadata properties in various formats.
Extract technical information from images, audio and video files.
Calculate common document statistics (word count, character count, etc.).
Detect the format and MIME type of a file by its internal structure.
Work with various audio tags (ID3, Lyrics, APE).
Load file from a local disk or a stream.
Load a file of a specific format or load a password protected file.
Traverse a whole metadata tree.
Work with the APEv2, ID3v1, ID3v2, Lyrics & other tags of MP3 metadata.

New Features & Enhancements in Version 20.7

Implemented the ability to work with EXIF metadata in JPEG2000 images.
Added support for the HEIF/HEIC format.
Implemented the ability to extract metadata from encrypted MS Project files.
Implemented the ability to manage custom properties in Project files. Added support for additional built-in properties.

For the detailed notes, please visit GroupDocs.Metadata for .NET 20.7 Release Notes.

Read & Write Metadata Formats

Microsoft Word: DOC, DOT, DOCX, DOCM, DOTX Microsoft Excel: XLSX, XLSM, XLTM, XLS Microsoft PowerPoint: PPTX, PPTM, PPSX, PPSM, POTX, POTM, PPT, PPS Microsoft Visio: VSD, VDX, VSDX, VSS, VSX Microsoft OneNote: ONE Microsoft Project: MPP OpenOffice: ODS, ODT, OTF, OTC Audio: MP3, WAV Video: AVI, MOV / QT, ASF, FLV Email: EML, MSG, VCF, VCR Image: BMP, GIF, JPG, JPEG, JPE, JP2, PNG, TIFF, DICOM, WEBP Archive: ZIP Font: TTF, TTC Metafile: EMF, WMF Adobe Photoshop: PSD AutoCAD: DWG, DXF Portable: PDF eBook: EPUB, DJVU, DJV Other: TORRENT

Platform Independence

GroupDocs.Metadata for .NET does not require any external software or third party tool to be installed. GroupDocs.Metadata for .NET supports any 32-bit or 64-bit operating system where .NET or Mono framework is installed. The other details are as follows:

Microsoft Windows: Microsoft Windows Desktop (x86, x64) (XP & up), Microsoft Windows Server (x86, x64) (2000 & up), Windows Azure Mac OS: Mac OS X Linux: Linux (Ubuntu, OpenSUSE, CentOS and others) Development Environments: Microsoft Visual Studio (2010 & up), Xamarin.Android, Xamarin.IOS, Xamarin.Mac, MonoDevelop 2.4 and later. Supported Frameworks: GroupDocs.Conversion for .NET supports .NET and Mono frameworks.

Remove Metadata from a PDF

using (Metadata metadata = new Metadata(Constants.InputPdf))
{
    // Remove detected metadata packages
    var affected = metadata.Sanitize();
    Console.WriteLine("Properties removed: {0}", affected);
metadata.Save(Constants.OutputPdf);

}

Extract Metadata from Various Files via C# Code

foreach (string file in Directory.GetFiles(Constants.InputPath))
{
    using (Metadata metadata = new Metadata(file))
    {
        if (metadata.FileFormat != FileFormat.Unknown && !metadata.GetDocumentInfo().IsEncrypted)
        {
            Console.WriteLine();
            Console.WriteLine(file);
        // fetch all metadata properties that fall into a particular category
        var properties = metadata.FindProperties(p =&gt; p.Tags.Any(t =&gt; t.Category == Tags.Content));
        Console.WriteLine(<span class="hljs-string">"The metadata properties describing some characteristics of the file content: title, keywords, language, etc."</span>);
        foreach (var <span class="hljs-keyword">property</span> <span class="hljs-keyword">in</span> properties)
        {
            Console.WriteLine(<span class="hljs-string">"{0} = {1}"</span>, <span class="hljs-keyword">property</span>.Name, <span class="hljs-keyword">property</span>.Value);
        }

        // fetch all properties having a specific <span class="hljs-keyword">type</span> <span class="hljs-keyword">and</span> value
        var year = DateTime.Today.Year;
        properties = metadata.FindProperties(p =&gt; p.Value.<span class="hljs-keyword">Type</span> == MetadataPropertyType.DateTime &amp;&amp;
                                                 p.Value.ToStruct(DateTime.MinValue).Year == year);

        Console.WriteLine(<span class="hljs-string">"All datetime properties with the year value equal to the current year"</span>);
        foreach (var <span class="hljs-keyword">property</span> <span class="hljs-keyword">in</span> properties)
        {
            Console.WriteLine(<span class="hljs-string">"{0} = {1}"</span>, <span class="hljs-keyword">property</span>.Name, <span class="hljs-keyword">property</span>.Value);
        }
    }
}

}