.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.

Document Metadata Processing Features

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 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 20.8

Implemented the ability to add/update EXIF & metadata properties of arbitrary types using the search API.
Implemented the ability to add/update XMP metadata properties of arbitrary types using the search API.

For the detailed notes, please visit GroupDocs.Metadata for .NET 20.8 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
macOS: 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.Metadata for .NET supports .NET and Mono frameworks.

Remove All Metadata Properties from a File

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 Files

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 => p.Tags.Any(t => t.Category == Tags.Content));
            Console.WriteLine("The metadata properties describing some characteristics of the file content: title, keywords, language, etc.");
            foreach (var property in properties)
            {
                Console.WriteLine("{0} = {1}", property.Name, property.Value);
            }

            // fetch all properties having a specific type and value
            var year = DateTime.Today.Year;
            properties = metadata.FindProperties(p => p.Value.Type == MetadataPropertyType.DateTime &&
                                                     p.Value.ToStruct(DateTime.MinValue).Year == year);

            Console.WriteLine("All datetime properties with the year value equal to the current year");
            foreach (var property in properties)
            {
                Console.WriteLine("{0} = {1}", property.Name, property.Value);
            }
        }
    }
}