Get Metadata for layers in SOE

GetMetadataForLayersFromSoe.cs

private List<string> GetMetadataForLayers()
{
    var mapServer = (IMapServer3)_serverObjectHelper.ServerObject; // _serverObjectHelper is an IServerObjectHelper
    string defaultMapName = mapServer.DefaultMapName;

    var msDataAccess = (IMapServerDataAccess)_serverObjectHelper.ServerObject;
    IMapServerInfo3 mapServerInfo = (IMapServerInfo3)mapServer.GetServerInfo(defaultMapName);
    IMapLayerInfos layerInfos = mapServerInfo.MapLayerInfos;

    List<string> xmlList = new List<string>(layerInfos.Count);

    string xml;
    IDataset layer;
    IMetadata metadata;
    IXmlPropertySet2 propSet;
    for (int i = 0; i < layerInfos.Count; i++)
    {
        xml = null;
        layer = msDataAccess.GetDataSource(defaultMapName, i) as IDataset;
        if (layer != null)
        {
            metadata = layer.FullName as IMetadata;
            if (metadata != null)
            {
                propSet = metadata.Metadata as IXmlPropertySet2;
                if (propSet != null)
                {
                    xml = propSet.GetXml(string.Empty);
                }
            }
        }
        xmlList.Add(xml);

    }

    return xmlList;
}