var sharedRenderings = GetRenderings(Sitecore.Context.Item, Sitecore.FieldIDs.LayoutField);
var finalRenderings = GetRenderings(Sitecore.Context.Item, Sitecore.FieldIDs.FinalLayoutField);


private static int GetRenderings(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 != null ? deviceLayout.Renderings : null;
}