Schema Extension Value is always NULL when updating through Microsoft Graph SDK - microsoft-graph-sdks

Question

Step 1:
Created GraphServiceClient using Microsoft.Graph 4.9.0 and Microsoft.Graph.Core 2.0.5 SDK
var scopes = new[] { "https://graph.microsoft.com/.default" };
ClientSecretCredential clientSecretCredential = new ClientSecretCredential(tenantId, clientId, clientSecret, new ClientSecretCredentialOptions()
{
AuthorityHost = AzureAuthorityHosts.AzurePublicCloud
});`
GraphServiceClient graphServiceClient = new GraphServiceClient(clientSecretCredential, scopes);
Step 2:
And created a custom schema extension like below.
SchemaExtension schemaExtension = new SchemaExtension()
{
Id = "data1",
Description = "creating test schema extn",
TargetTypes = new List<string>()
{
"User"
},
Properties = new List<ExtensionSchemaProperty>()
{
new ExtensionSchemaProperty()
{
Name ="prop1",
Type ="String"
}
}
};
Step 3:
Updated the Schema extension status to "Available"
var updatedExtn = await graphServiceClient
.SchemaExtensions[schemaExtension.Id].Request()
.UpdateAsync(new SchemaExtension()
{
Status = "Available"
});
Step 4:
Create Class for extension data
public class data1
{
// You must serialize your property names to camelCase if your SchemaExtension describes as such.
[JsonProperty(NullValueHandling = NullValueHandling.Ignore, PropertyName = "prop1", Required = Newtonsoft.Json.Required.Default)]
public string Prop1 { get; set; }
}
Step 5:
Find the User and add the created schema extension to the user
IDictionary<string, object> extensionInstance = new Dictionary<string, object>();
// The below line is not working. but doesn't throw error
extensionInstance.Add(schemaExtension.Id, new data1 { prop1 = "testing" });
var usrCollection = await graphServiceClient.Users
.Request()
.Filter($"userPrincipalNames eq '{adelev_Mail}'")
.GetAsync();
var usr = usrCollection.FirstOrDefault();
if(usr != null)
{
usr.AdditionalData.Add(extensionInstance);
var updatedUser = await graphServiceClient.Users[usr.Id]
.Request()
.UpdateAsync(usr);
}
Step 6:
When you try to retrieve the extension the value is NULL.
User updatedUser = await graphServiceClient.Users[usr.Id].Request()
.Select($"id, {schemaExtension.Id}")
.GetAsync();
But it works with API using Graph Explorer.
PATCH https://graph.microsoft.com/v1.0/users/{userId}
{
"extXXXXXXXX_data1":
{
"prop1" : "testing"
}
}
Please let me know if I'm missing anything here. Any help here is much appreciated.

Answer 1

You should accessing the data on AdditionalData property. Try looking at user.AdditionalData in your result. Here is a screenshot with my example.
Getting User with Schema extension from Graph explorer.
While using the SDK, i access my custom data in user.AdditionalData
Check this thread - Graph SDK and SchemaExtensions for details.