Microsoft.Graph.GraphServiceClient how to limit properties returned? - azure-active-directory

Question

I am using Azure AD B2C. I was hoping to get a count of the number of users - however, according to the documentation:
Azure AD B2C currently does not support advanced query capabilities on
directory objects. This means that there is no support for $count ...
Great, so I thought the next best thing to do was to perform a query to get all the ids of the users, i.e.:
var options = new TokenCredentialOptions
{
AuthorityHost = AzureAuthorityHosts.AzurePublicCloud
};
var clientSecretCredential = new ClientSecretCredential( tenant_id, client_id, client_secret, options );
var scopes = new[] { "https://graph.microsoft.com/.default" };
var users = await graphClient.Users
.Request()
.Select( "id" )
.GetAsync();
// This shows other properties returned in addition to "id" ...
if ( users is not null )
{
Console.WriteLine( JsonSerializer.Serialize( users ) );
}
I was under the impression (from the documentation) that using .Select( "id" ) would only return the "id" property, instead, the graph client returns what I assume are a default set of properties per user in addition to the "id", i.e.:
[
{"accountEnabled":null,
"ageGroup":null,
...more properties...,
"id":"xxxx...",
"#odata.type":"microsoft.graph.user"
},
{"accountEnabled":null,
"ageGroup":null,
... more properties ...,
"id":"xxxx...",
"#odata.type":"microsoft.graph.user"
}, ...
]
I am probably doing something wrong, but just how do you return ONLY the property (in this case "id") WITHOUT any other properties? I have yet to find an example or documentation that describes how to do this.
Thanks in advance.

Answer 1

Thanks to #user2250152 and #Rukmini - the "answer" per se is that the graph QUERY returns only the selected / requested properties, that is, when the following code is used:
var users = await graphClient.Users
.Request()
.Select("id")
.GetAsync();
The QUERY returns the "ids" as illustrated in #Rukmini's answer, but then the graphClient populates a list of "User" objects that is returned when the call completes. The User objects will contain the Id property as well as all the other properties associated with a User object as mentioned by #user2250152.
Thanks again for clearing this up.

Answer 2

I tried to reproduce the same in my environment and got the results successfully like below:
To get the Azure AD b2c User IDs I used the below code:
using Microsoft.Graph;
using Azure.Identity;
var scopes = new[] { "https://graph.microsoft.com/.default" };
var tenantId = "b2corg.onmicrosoft.com";
var clientId = "ClientID";
var options = new TokenCredentialOptions
{
AuthorityHost = AzureAuthorityHosts.AzurePublicCloud
};
var userName = "admin#b2corg.onmicrosoft.com";
var password = "password";
var userNamePasswordCredential = new UsernamePasswordCredential(
userName, password, tenantId, clientId, options);
var graphClient = new GraphServiceClient(userNamePasswordCredential, scopes);
var users = await graphClient.Users
.Request()
.Select("id")
.GetAsync();
users.ToList().ForEach(x => { Console.WriteLine("\nid: " + x.Id); });
I also tried in the Microsoft Graph Explorer, and I am able to fetch only the User IDs like below:
https://graph.microsoft.com/v1.0/users?$select=id