How to programmatically get or set only Shared Or Final Layout renderings

Question

The following code will remove rendering from items. It works fine but the changes happen only in the Shared Layout.

Is there a way to read/update renderings in only a certain layout type - Shared or Final.

LayoutField layoutField = new LayoutField(targetItem.Fields[FieldIDs.LayoutField]);
LayoutDefinition layoutDefinition = LayoutDefinition.Parse(layoutField.Value);
DeviceDefinition deviceDefinition = layoutDefinition.GetDevice("{FE5D7FDF-89C0-4D99-9AA3-B5FBD009C9F3}");
DeviceDefinition ddef = layoutDefinition.GetDevice(deviceDefinition.ID.ToString());

/// Get the array of all renderings for the target page item                    
IEnumerable<RenderingDefinition> renderingsArray = ddef.Renderings.ToArray().Cast<RenderingDefinition>();  

ddef.Renderings = new ArrayList(renderingsArray.Where(r => r.ItemID != someRenderingId).ToList());

/// Save the layout changes                     
using (new SecurityDisabler())
{
       targetItem.Editing.BeginEdit();
       layoutField.Value = layoutDefinition.ToXml();
       targetItem.Editing.EndEdit();
}

Answer 1

You can get the final and shared layout using the following code. You can refer Get amount of components on final layout programmatically

// Returns the number of shared and final renderings for an item.
// Final renderings are based on language/version of the item.
// This presumes there is only one device with renderings configured.
public static System.Tuple<int, int> CountRenderings(Sitecore.Data.Items.Item item)
{
    var sharedRenderingsCount = CountRenderings(item, Sitecore.FieldIDs.LayoutField);
    var finalRenderingCount = CountRenderings(item, Sitecore.FieldIDs.FinalLayoutField);
    return Tuple.Create(sharedRenderingsCount, finalRenderingCount);
}

private static int CountRenderings(Sitecore.Data.Items.Item item, Sitecore.Data.ID renderingFieldId)
{
    var field = item.Fields[renderingFieldId];
    var layoutXml = Sitecore.Data.Fields.LayoutField.GetFieldValue(field);
    var layout = Sitecore.Layouts.LayoutDefinition.Parse(layoutXml);
    var deviceLayout = layout.Devices[0] as Sitecore.Layouts.DeviceDefinition;
    return (deviceLayout?.Renderings.Count) ?? 0;
}

And to set it again you can follow this - http://rockpapersitecore.com/2016/07/merging-final-renderings-back-down-into-shared-renderings/. You can modify code as per your requirements -

//Grab the field that contains the layout
    var layoutField = new LayoutField(item.Fields[Sitecore.FieldIDs.LayoutField]);

    //Grab the field that contains the final layout
    var finalLayoutField = new LayoutField(item.Fields[Sitecore.FieldIDs.FinalLayoutField]);

    if (layoutField == null)
        throw new Exception("Couldn't find layout on: {0}".FormatWith(item.Name));

    if (finalLayoutField == null)
        throw new Exception("Couldn't find final layout on: {0}".FormatWith(item.Name));

    //If we don't have a final layout delta, we're good!
    if (string.IsNullOrWhiteSpace(finalLayoutField.Value))
    {
        return;
    }

    var finalLayoutDefinition = LayoutDefinition.Parse(finalLayoutField.Value);

    using (new EditContext(item))
    {
        layoutField.Value = finalLayoutDefinition.ToXml();
        item.Fields["__Final Renderings"].Reset();
        item.Editing.AcceptChanges();
    }