public override void Write(Utf8JsonWriter writer, TMessage value, JsonSerializerOptions options)
{
// Note: This logic replicates Google.Protobuf. Should follow their lead.
var paths = (IList <string>)value.Descriptor.Fields[FieldMask.PathsFieldNumber].Accessor.GetValue(value);
var firstInvalid = paths.FirstOrDefault(p => !Legacy.IsPathValid(p));
if (firstInvalid == null)
{
writer.WriteStringValue(string.Join(",", paths.Select(Legacy.ToJsonName)));
}
else
{
throw new InvalidOperationException($"Invalid field mask to be converted to JSON: {firstInvalid}.");
}
}
