How to get started with the Azure AD Graph API

var signInUserId = ClaimsPrincipal.Current.FindFirst(ClaimTypes.NameIdentifier).Value;<br>var userObjectId = ClaimsPrincipal.Current.FindFirst("http://schemas.microsoft.com/identity/claims/objectidentifier").Value; <br>
string TenantIdClaimType = "http://schemas.microsoft.com/identity/claims/tenantid";<br>
string tenantId = ClaimsPrincipal.Current.FindFirst(TenantIdClaimType).Value;<br>
string upn = HttpContext.Current.User.Identity.Name;<br>
Microsoft.IdentityModel.Clients.ActiveDirectoryAuthenticationContext ac = new Microsoft.IdentityModel.Clients.ActiveDirectoryAuthenticationContext(string.Format("https://login.windows.net/{0}", tenantId));<br>
// SettingsHelper.ClientId = "ClientId value  retrieved from the Azure AD"
// SettingsHelper.AppKey = "Keys for the registered application in the Azure AD"
ClientCredential cc = new ClientCredential(SettingsHelper.ClientId, SettingsHelper.AppKey);<br>
AuthenticationResult result = ac.AcquireToken("https://graph.windows.net", cc);<br>
HttpClient client = new HttpClient();<br>
string requestUrl = String.Format(<br>
                                CultureInfo.InvariantCulture,<br>
                                "https://graph.windows.net/{0}/users/{1}?api-version=2013-11-08",<br>
                                HttpUtility.UrlEncode(tenantId), HttpUtility.UrlEncode(upn));<br>
HttpRequestMessage request = new HttpRequestMessage(HttpMethod.Get, requestUrl);<br>
request.Headers.Authorization = new AuthenticationHeaderValue("Bearer", result.AccessToken);<br>
HttpResponseMessage response = client.SendAsync(request).Result;<br>
User user = null; // Type "User" is a custom class with the userprofile properties<br>
if (response.IsSuccessStatusCode)<br>
{<br>
  string responseString = response.Content.ReadAsStringAsync().Result;<br>
  user = JsonConvert.DeserializeObject<User>(responseString);<br>
}