Add custom file extended properties

Question

After adding metadata property handler for.svg extension with this tool , I am able to add keywords to.svg files via Windows Explorer.

I am now searching a way to add keywords via a C# application. I found this solution but System.AccessViolationException is thrown with the code:

using Microsoft.WindowsAPICodePack.Shell;

var tags = new[] {"foo", "bar"};
var file = ShellFile.FromFilePath(path);
// following statement throws System.AccessViolationException
file.Properties.System.Keywords.Value = tags;

What can be the cause?

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Edit:

This method works correctly but COMException is thrown if tag length is too high.

using DSOFile;

var file = new OleDocumentProperties();
file.Open(path);
file.SummaryProperties.Keywords = string.Join(";", tags);
file.Close(true);

Answer 1

This works for me:

using Microsoft.WindowsAPICodePack.Shell;

var shellFile = ShellFile.FromParsingName(filePath);
// This one throws an exception
// shellFile.Properties.System.Keywords.Value = new[] { "test1", "test2" }; 
var writer = shellFile.Properties.GetPropertyWriter();
// This works, pass keywords as single string
writer.WriteProperty(SystemProperties.System.Keywords, "test1;test2", true);
writer.Close();