(.NET Core C#) XMP Array Property - Bag, Seq, or Alt

How to insert or update an XMP array property (bag, seq, or alt).

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// This requires the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.

Chilkat.Xmp xmp = new Chilkat.Xmp();

// Load a JPG or TIF image file.
// Sample JPG's with XMP metadata may be found at:
// http://www.chilkatsoft.com/testData/xmp/sample1.jpg
// http://www.chilkatsoft.com/testData/xmp/sample2.jpg
// http://www.chilkatsoft.com/testData/xmp/sample3.jpg
bool success = xmp.LoadAppFile("sample1.jpg");
if (success != true) {
    Debug.WriteLine(xmp.LastErrorText);
    return;
}

Debug.WriteLine("Num embedded XMP docs: " + Convert.ToString(xmp.NumEmbedded));

// Assuming there is at least one, get the 1st.
// (There is typically never more than one, but theoretically it's possible.)
Chilkat.Xml xml = null;
xml = xmp.GetEmbedded(0);
if (xmp.LastMethodSuccess == true) {

    // Create an object to hold one or more string values.
    Chilkat.StringArray sa = new Chilkat.StringArray();
    success = sa.Append("value_1");
    success = sa.Append("value_2");
    // ...

    success = xmp.AddArray(xml,"bag","Iptc4xmpCore:Chilkat",sa);
    if (success != true) {
        Debug.WriteLine(xmp.LastErrorText);
    }
    else {
        // Save the JPG.
        success = xmp.SaveAppFile("modified.jpg");
        if (success != true) {
            Debug.WriteLine(xmp.LastErrorText);
        }

    }

}
else {
    Debug.WriteLine(xmp.LastErrorText);
}