Add or Remove Custom XMP Metadata from GIF images in C# using GroupDocs.Metadata for .NET

CustomXMPMetadata_csharp

Add or Remove Custom XMP Metadata from GIF images using C#
1. Add Custom XMP Metadata Package to GIF using C#
2. Read Custom XMP Metadata Package Properties using C#
3. Remove Custom XMP Metadata Package using C#

CustomXMPMetadata_csharp_Add.cs

using (Metadata metadata = new Metadata(@"C:\Files\xmp.gif")) {

  IXmp root = (IXmp)metadata.GetRootPackage();
  XmpPacketWrapper packet = new XmpPacketWrapper();

  XmpPackage custom = new XmpPackage("gd", "https://groupdocs.com");
  custom.Set("gd:Copyright", "Copyright (C) 2021 GroupDocs. All Rights Reserved.");
  custom.Set("gd:CreationDate", DateTime.Now.ToString());
  custom.Set("gd:Company", XmpArray.From(new String[] { "Aspose", "GroupDocs" }, XmpArrayType.Ordered));

  packet.AddPackage(custom);
  root.XmpPackage = packet;
  metadata.Save(@"C:\Files\xmp_output.gif");
}

CustomXMPMetadata_csharp_Read.cs

string file = @"C:\Files\xmp_output.gif";
using (Metadata metadata = new Metadata(file)) 
{
  IXmp root = (IXmp)metadata.GetRootPackage();

  if (root.XmpPackage != null)
  {
    foreach (var package in root.XmpPackage.Packages)
    {
      Console.WriteLine(package.NamespaceUri);
      Console.WriteLine(package.Prefix);

      foreach(var keys in package.Keys)
      {
        var property = package.FindProperties(p => p.Name == keys).FirstOrDefault();
        Console.WriteLine(property.Name + " : " + property.Value);
      }
    }
  }
}

CustomXMPMetadata_csharp_Remove.cs

using (Metadata metadata = new Metadata(@"C:\Files\xmp_output.gif"))
{
  IXmp root = (IXmp)metadata.GetRootPackage();
  root.XmpPackage = null;
  metadata.Save(@"C:\Files\xmp_output_Removed.gif");
}