public EsriHttpClient()

//Reference Newtonsoft - Json.Net
//Reference System.Net.Http
UriBuilder selfURL = new UriBuilder(ArcGISPortalManager.Current.GetActivePortal().PortalUri)
{
  Path = "sharing/rest/portals/self",
  Query = "f=json"
};
EsriHttpResponseMessage response = new EsriHttpClient().Get(selfURL.Uri.ToString());

dynamic portalSelf = JObject.Parse(await response.Content.ReadAsStringAsync());
// if the response doesn't contain the user information then it is essentially
// an anonymous request against the portal
if (portalSelf.user == null)
  return;
string userName = portalSelf.user.username;

//Assume that you have executed the "Get the Current signed on User" snippet and have 'userName'
UriBuilder groupsURL = new UriBuilder(ArcGISPortalManager.Current.GetActivePortal().PortalUri)
{
  Path = String.Format("sharing/rest/community/users/{0}", userName),
  Query = "f=json"
};
var groupResponse = new EsriHttpClient().Get(groupsURL.Uri.ToString());
dynamic portalGroups = JObject.Parse(await groupResponse.Content.ReadAsStringAsync());

string groups = portalGroups.groups.ToString();

//http://www.arcgis.com/sharing/search?q=owner:esri&f=json

UriBuilder searchURL = new UriBuilder(ArcGISPortalManager.Current.GetActivePortal().PortalUri)
{
  Path = "sharing/rest/search",
  Query = "q=owner:esri&f=json"
};
EsriHttpClient httpClient = new EsriHttpClient();
var searchResponse = httpClient.Get(searchURL.Uri.ToString());
dynamic resultItems = JObject.Parse(await searchResponse.Content.ReadAsStringAsync());

long numberOfTotalItems = resultItems.total.Value;
long currentCount = 0;

List<dynamic> resultItemList = new List<dynamic>();
// store the first results in the list
resultItemList.AddRange(resultItems.results);
currentCount = currentCount + resultItems.num.Value;
//Up to 50
while (currentCount < numberOfTotalItems && currentCount <= 50)
{
  searchURL.Query = String.Format("q=owner:esri&start={0}&f=json", resultItems.nextStart.Value);
  searchResponse = httpClient.Get(searchURL.Uri.ToString());
  resultItems = JObject.Parse(await searchResponse.Content.ReadAsStringAsync());
  resultItemList.AddRange(resultItems.results);
  currentCount = currentCount + resultItems.num.Value;
}

UriBuilder searchURL = new UriBuilder(ArcGISPortalManager.Current.GetActivePortal().PortalUri)
{
  Path = "sharing/rest/portals/self",
  Query = "f=json"
};
EsriHttpClient httpClient = new EsriHttpClient();
EsriHttpResponseMessage response = httpClient.Get(searchURL.Uri.ToString());

dynamic portalSelf = JObject.Parse(await response.Content.ReadAsStringAsync());
// if the response doesn't contain the user information then it is essentially
// an anonymous request against the portal
if (portalSelf.user == null)
  return;
string userName = portalSelf.user.username;

searchURL.Path = "sharing/rest/search";
string webMaps = "(type:\"Web Map\" OR type:\"Explorer Map\" OR type:\"Web Mapping Application\" OR type:\"Online Map\")";
searchURL.Query = string.Format("q=owner:{0} {1}&f=json", userName, webMaps);

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);

if (MapFactory.Instance.CanCreateMapFrom(currentItem))
{
  Map newMap = MapFactory.Instance.CreateMapFromItem(currentItem);
  await ProApp.Panes.CreateMapPaneAsync(newMap);
}

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);
});