Adding Sample to enumerate groups a user is a member of #118 (#128)

Adding Sample to enumerate groups a user is a member of #118

ClientLibrary/Quickstarts/dotnet/GraphQuickStarts/Program.cs

@@ -1,4 +1,5 @@
-using System;
+using Microsoft.VisualStudio.Services.Graph.Client;
+using System;
 using System.Collections.Generic;
 
 namespace GraphQuickStarts
@@ -32,16 +33,15 @@ namespace GraphQuickStarts
                 Console.WriteLine("Executing Graph quick start samples...");
                 Console.WriteLine("");
 
-                //instantiate objects & execute
+                // Enumerate Users sample
                 Samples.EnumerateUsers objUsers = new Samples.EnumerateUsers(connectionUrl, token);
+                List<GraphUser> users = objUsers.RunEnumerateUsersUsingClientLib();
 
-                //execute the client lib code. If you want to run the direct http calls then adjust (see below)
-                objUsers.RunEnumerateUsersUsingClientLib();
+                // Enumber Group Memberships sample
+                objUsers.RunEnumerateEnumerateGroupMembershipsUsingClientLib(users);
 
-                //instantiate objects & execute
+                // Enumerate Members of Groups sample
                 Samples.EnumerateMembersOfGroups objMembers = new Samples.EnumerateMembersOfGroups(connectionUrl, clientId, redirectURL);
-
-                //execute the client lib code. If you want to run the direct http calls then adjust (see below)
                 objMembers.RunEnumerateMembersOfGroupsUsingClientLib(groupName);
 
                 Console.ReadKey();

ClientLibrary/Quickstarts/dotnet/GraphQuickStarts/Samples/EnumerateUsers.cs

@@ -69,5 +69,30 @@ namespace GraphQuickStarts.Samples
 
             return null;
         }
+
+        public List<string> RunEnumerateEnumerateGroupMembershipsUsingClientLib(List<GraphUser> users)
+        {
+            Uri uri = new Uri(_uri);
+            VssBasicCredential credentials = new VssBasicCredential("", _personalAccessToken);
+
+            using (GraphHttpClient graphClient = new GraphHttpClient(uri, credentials))
+            {
+                List<string> memberships = new List<string>();
+
+                foreach (GraphUser user in users)
+                {
+                    List<GraphMembership> groupMemberships = graphClient.GetMembershipsAsync(user.Descriptor).Result;
+                    foreach(GraphMembership membership in groupMemberships)
+                    {
+                        GraphGroup resolvedGroup = graphClient.GetGroupAsync(membership.ContainerDescriptor).Result;
+                        memberships.Add(String.Format("{0}:{1} --> {2}:{3}", user.DisplayName, user.PrincipalName, resolvedGroup.Origin, resolvedGroup.DisplayName));
+                    }
+                }
+
+                return memberships;
+            }
+
+            return null;
+        }
     }
 }