Problem deserializing Microsoft.Graph objects

Question

I use Microsoft.Graph apis in my app. I make a request and get back the json data. But I am really confused trying to deserialize it. E.g. for this json:

{
  "@odata.context": "https://graph.microsoft.com/v1.0/$metadata#Collection(microsoft.graph.scheduleInformation)",
  "value": [
    {
      "scheduleId": "******@company.com",
      "availabilityView": "000000002022000",
      "scheduleItems": [
        {
          "isPrivate": false,
          "status": "busy",
          "subject": "Standup",
          "location": "Microsoft Teams Meeting",
          "isMeeting": true,
          "isRecurring": true,
          "isException": false,
          "isReminderSet": true,
          "start": {
            "dateTime": "2023-08-30T13:00:00.0000000",
            "timeZone": "UTC"
          },
          "end": {
            "dateTime": "2023-08-30T13:30:00.0000000",
            "timeZone": "UTC"
          }
        } 
      ],
      "workingHours": {
        "daysOfWeek": [
          "monday",
          "tuesday",
          "wednesday",
          "thursday",
          "friday"
        ],
        "startTime": "08:00:00.0000000",
        "endTime": "17:00:00.0000000",
        "timeZone": {
          "name": "Eastern Standard Time"
        }
      }
    },
    {
      "scheduleId": "******@company.com",
      "availabilityView": "000000000000000",
      "scheduleItems": [],
      "workingHours": {
        "daysOfWeek": [
          "monday",
          "tuesday",
          "wednesday",
          "thursday",
          "friday"
        ],
        "startTime": "08:00:00.0000000",
        "endTime": "17:00:00.0000000",
        "timeZone": {
          "name": "Eastern Standard Time"
        }
      }
    }    
  ]
}

I created a class for the root object:

public class ScheduleInformationRootObject
{
    [JsonProperty("@odata.context")]
    public string ODataContext { get; set; }
    [JsonProperty("value")]
    public List<ScheduleInformation> Value { get; set; }
}

Maybe Microsoft.Graph has already such a class, but I could not find it. If it exists, please let me know. So I tried to deserialize like this:

ScheduleInformationRootObject outlookScheduleInfo = JsonConvert.DeserializeObject<ScheduleInformationRootObject>(responseJson);

But this gives me an exception:

Newtonsoft.Json.JsonSerializationException: 'Error converting value "08:00:00.0000000" to type 'System.Nullable`1[Microsoft.Kiota.Abstractions.Time]'. Path 'value[0].workingHours.startTime', line 1, position 1344.'

I also tried to deserialize using another library:

        var options = new JsonSerializerOptions
        {
            PropertyNameCaseInsensitive = true // Enable case-insensitive property matching
        };

        ScheduleInformationRootObject outlookScheduleInfo = System.Text.Json.JsonSerializer.Deserialize<ScheduleInformationRootObject>(responseJson, options);

This gives me another exception:

The JSON value could not be converted to System.Nullable`1[Microsoft.Graph.Models.FreeBusyStatus]. Path: $.value[0].scheduleItems[0].status | LineNumber: 0 | BytePositionInLine: 248.

In this case, it cannot convert the string value of "status" field to an object of class FreeBusyStatus.

I can re-write Microsoft.Graph's classes, but it doesn't seem to be the right approach.

I noticed that class ScheduleInformation has

    /// <summary>
    /// The deserialization information for the current model
    /// </summary>
    public IDictionary<string, Action<IParseNode>> GetFieldDeserializers() {
        return new Dictionary<string, Action<IParseNode>> {
            {"availabilityView", n => { AvailabilityView = n.GetStringValue(); } },
            {"error", n => { Error = n.GetObjectValue<FreeBusyError>(FreeBusyError.CreateFromDiscriminatorValue); } },
            {"@odata.type", n => { OdataType = n.GetStringValue(); } },
            {"scheduleId", n => { ScheduleId = n.GetStringValue(); } },
            {"scheduleItems", n => { ScheduleItems = n.GetCollectionOfObjectValues<ScheduleItem>(ScheduleItem.CreateFromDiscriminatorValue)?.ToList(); } },
            {"workingHours", n => { WorkingHours = n.GetObjectValue<Microsoft.Graph.Models.WorkingHours>(Microsoft.Graph.Models.WorkingHours.CreateFromDiscriminatorValue); } },
        };
    }

But cannot figure out how this should be used.

Answer 1

Hello Dmitriy Reznik,

Thanks for reaching out. For any queries related to custom code or Graph SDK please post them on the respective Graph SDK forum as they are not supported in this forum.

GetSchedule response object has the property Value of type List<ScheduleInformation>. Please see https://github.com/microsoftgraph/msgraph-sdk-dotnet/issues/1858 for more information.

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Thanks.