Sitecore CMS - Event for handling changing the DataSources from path information to GUIDs to be inserted in the item:saving event prior to the save event

gistfile1.cs

  /// <summary>    
    /// The layout data sources are saved with a text path and not a guid.
    /// </summary>
    public class EnsureDataSourceIsGUID
    {
        public void OnItemSaving(object sender, EventArgs args)
        {
            Sitecore.Diagnostics.Log.Info("Running EnsureDataSourceIsGUID", this);
            Item item = Event.ExtractParameter(args, 0) as Item;
 
            if (item.Database.Name == "master")
            {
                LayoutField layoutField = new LayoutField(item.Fields[Sitecore.FieldIDs.LayoutField]);
                if (!layoutField.InnerField.HasValue)
                {
                    return;
                }
                if (string.IsNullOrEmpty(layoutField.Value))
                {
                    return;
                }
                LayoutDefinition layout = LayoutDefinition.Parse(layoutField.Value);
                for (int i = 0; i < layout.Devices.Count; i++)
                {
                    DeviceDefinition device = layout.Devices[i] as DeviceDefinition;
                    for (int j = 0; j < device.Renderings.Count; j++)
                    {
                        RenderingDefinition rendering = device.Renderings[j] as RenderingDefinition;
                        if (!string.IsNullOrEmpty(rendering.Datasource) && rendering.Datasource.StartsWith("/"))
                        {
                            Item datasourceItem = item.Database.GetItem(rendering.Datasource);
                            if (datasourceItem == null)
                            {
                                Sitecore.Diagnostics.Log.Warn(string.Format("Could not find datasource item at path {0} while saving item {1}", rendering.Datasource, item.ID), this);
                                continue;
                            }
                            rendering.Datasource = datasourceItem.ID.ToString();
                        }
                    }
                }
                layoutField.Value = layout.ToXml();
 
            }
        }
    }