public Item Create( 
   string uri,
   ItemFactory.ItemType itemType
)

/// Import a mxd
Item mxdToImport = ItemFactory.Instance.Create(@"C:\Projects\RegionalSurvey\LatestResults.mxd");
var addedMxd = await QueuedTask.Run(
              () => Project.Current.AddItem(mxdToImport as IProjectItem));

/// Add map package      
Item mapPackageToAdd = ItemFactory.Instance.Create(@"c:\Data\Map.mpkx");
var addedMapPackage = await QueuedTask.Run(
              () => Project.Current.AddItem(mapPackageToAdd as IProjectItem));

/// Add an exported Pro map
Item proMapToAdd = ItemFactory.Instance.Create(@"C:\ExportedMaps\Election\Districts.mapx");
var addedMapProjectItem = await QueuedTask.Run(
              () => Project.Current.AddItem(proMapToAdd as IProjectItem));

Item mxdItem = ItemFactory.Instance.Create(@"C:\Projects\RegionalSurvey\LatestResults.mxd");

// Creates an Item from an existing portal item base on its ID
string portalItemID = "9801f878ff4a22738dff3f039c43e395";
Item portalItem = ItemFactory.Instance.Create(portalItemID, ItemFactory.ItemType.PortalItem);

// Creates an Item from an existing portal folder base on its ID
string portalFolderID = "39c43e39f878f4a2279838dfff3f0015";
Item portalFolder = ItemFactory.Instance.Create(portalFolderID, ItemFactory.ItemType.PortalFolderItem);

Item featureClassItem = ItemFactory.Instance.Create(@"C:\projectAlpha\GDBs\regionFive.gdb\SourceFeatureClass");
await QueuedTask.Run(() => metadataItemImport.CopyMetadataFromItem(featureClassItem));

Item featureClassWithMetadataItem = ItemFactory.Instance.Create(@"C:\projectBeta\GDBs\regionFive.gdb\SourceFeatureClass");
//Delete thumbnail content from item's metadata
await QueuedTask.Run(() => featureClassWithMetadataItem.DeleteMetadataContent(MDDeleteContentOption.esriMDDeleteThumbnail));

//Import a pagx into a project.

//Create a layout project item from importing a pagx file
await QueuedTask.Run(() =>
{
  IProjectItem pagx = ItemFactory.Instance.Create(
                            @"C:\Temp\Layout.pagx") as IProjectItem;
  Project.Current.AddItem(pagx);
});

//Note: Call within QueuedTask.Run()
Item reportToImport = ItemFactory.Instance.Create(reportFile);
Project.Current.AddItem(reportToImport as IProjectItem);

UriBuilder searchURL = new UriBuilder(ArcGISPortalManager.Current.GetActivePortal().PortalUri)
{
  Path = "sharing/rest/search"
};
string layers = "(type:\"Map Service\" OR type:\"Image Service\" OR type:\"Feature Service\" OR type:\"WMS\" OR type:\"KML\")";
//any public layer content
searchURL.Query = string.Format("q={0}&f=json", layers);

EsriHttpClient httpClient = new EsriHttpClient();

var searchResponse = httpClient.Get(searchURL.Uri.ToString());
dynamic resultItems = JObject.Parse(await searchResponse.Content.ReadAsStringAsync());

long numberOfTotalItems = resultItems.total.Value;
if (numberOfTotalItems == 0)
  return;

List<dynamic> resultItemList = new List<dynamic>();
resultItemList.AddRange(resultItems.results);
//get the first result
dynamic item = resultItemList[0];

string itemID = item.id;
Item currentItem = ItemFactory.Instance.Create(itemID, ItemFactory.ItemType.PortalItem);

await QueuedTask.Run(() =>
{
      //Create a LayerCreationParam
      var layerParam = new LayerCreationParams(currentItem);
      // if we have an item that can be turned into a layer
      // add it to the map
      if (LayerFactory.Instance.CanCreateLayerFrom(currentItem))
    LayerFactory.Instance.CreateLayer<FeatureLayer>(layerParam, MapView.Active.Map);
});