Today we start reading up on Azure AD Graph API. This has let different web clients, applications and services to take advantage of doing CRUD on AD Artifacts directly. We will review some of the sample code to connect with this Graph API also. Graph APIs are as relevant to a cloud API provider as a portal to the user. In this section, we cover the usability aspect of the Graph APIs.
First of all the Azure AD Graph APIs lists entities and types and the operations that can be performed on them. These are REST based APIs so they follow the common REST standards.  The entities exposed by the APIs include Application, AppRoleAssignment, Contact, Device, DirectoryLinkChange, DirectoryObject, DirectoryRole, DirectoryRoleTemplate, ExtensionProperty, Group, OAuth2PermissionGrant, ServicePrincipal, SubscribedSKU, TenantDetail, User etc.
The complex types exposed by this API include AlternativeSecurityId, AppRole, AssignedLicense, AssignedPlan, KeyCredential, LicenseUnitsDetail, OAuth2Permission, PasswordCredential, PasswordProfile, ProvisionedPlan, Provisioning Error, RequiredResourceAccess, ResourceAccess, ServicePlanInfo, ServicePrincipalAuthenticationPolicy, VerifiedDomain etc.
In addition, the API is popular for the operations on the AD artifacts such as Users, Groups, Roles and Contacts.
The Operations on Users include CreateUser, GetUser(s), UpdateUser, DeleteUser, GetUserDirectReports, Get Users GroupMemberships, Get Users manager, Update Users manager, Reset User's Password.
The Operations on Group include CreateGroup, GetGroup(s), UpdateGroup, DeleteGroup, GetGroupMembers, AddaMemberToAGroup, RemoveaMemberFromAGroup, CheckGroupMembership, CheckGroupMembershipInList, GetAllGroupMemberships (transitive).
Roles and Contacts can only be listed with this Graph APIs.
DirectoryExtensions can also be created, updated and deleted with these APIs. Directory extensions enables application developers to extend the directory and develop richer applications without worrying about the limitations exposed by an external store. For example, user, Group, TenantDetail, Device, Application, and ServicePrincipal can be extended with String Type or BinaryType Single Valued Attributes. A single string attribute can take say 256 characters and 100 such extension values are permitted on a single object. A SkypeID for a user can be taken as an extension.

#codingexercise


GetOddNumberRangeSumSeventhRootPowerTwenty (Double [] A)


{


if (A == null) return 0;


Return A.OddNumberSumSeventhRootPowerTwenty();


}