msgraph-dotnet-v5-ga-odata-cast

ODataCastSimplified.cs

//Fetching the members of a group who are of the type User 
var usersInGroup = await graphServiceClient 
    .Groups["group-id"] 
    .Members 
    .GraphUser //cast to User 
    .GetAsync(); 

List<User> userList = usersInGroup.Value; 

//Similarly, members of the group of type ServicePrincipal 
var servicePrincipalsInGroup = await graphServiceClient 
    .Groups["group-id"] 
    .Members 
    .GraphServicePrincipal //cast to ServicePrincipal 
    .GetAsync(); 

List<ServicePrincipal> servicePrincipalList = servicePrincipalsInGroup.Value;