planner task assigned to user using graph API

Question

We are using ClientSecretCredential to create planner task using Graph API. It is working fine without Assignments. But as soon as we are adding assignment it is throwing exception "

The request is invalid:
Value cannot be null.
Parameter name: qualifiedName

Code working without assignment:

string tenentId = "4c150d40-f8a6-4418-b062-26ad5b6608dd";
                string clientId = "4456de51-6b8c-4d96-9c70-f944f30d76d9";
                string clientScret = "Rvx8Q~P8H1vf6092F9-7CPXredzIEsBe4j.krdwj";

                ClientSecretCredential clientSecretCredential = new ClientSecretCredential(tenentId, clientId, clientScret);
                GraphServiceClient gsClient = new GraphServiceClient(clientSecretCredential);


                var plannerTask1 = new PlannerTask();
                plannerTask1.PlanId = "XXXXXXXX";
                plannerTask1.BucketId = "DDDDDDDDDDDDD";
                plannerTask1.Title = plannerTask.Title + "067";

 var plannerTaskRes = await gsClient.Planner.Tasks.PostAsync(plannerTask1 );

Code with Assignment having exception

"The request is invalid:Value cannot be null. Parameter name: qualifiedName"

string tenentId = "4c150d40-f8a6-4418-b062-26ad5b6608dd";
string clientId = "4456de51-6b8c-4d96-9c70-f944f30d76d9";
string clientScret = "Rvx8Q~P8H1vf6092F9-7CPXredzIEsBe4j.krdwj";


ClientSecretCredential clientSecretCredential = new ClientSecretCredential(tenentId, clientId, clientScret);

 GraphServiceClient gsClient = new GraphServiceClient(clientSecretCredential);


                var plannerTask1 = new PlannerTask();
                plannerTask1.PlanId = "XXXXXXXX";
                plannerTask1.BucketId = "DDDDDDDDDDDDD";
                plannerTask1.Title = plannerTask.Title + "067";

plannerTask1.Assignments = new PlannerAssignments();
plannerTask1.Assignments.AdditionalData = new Dictionary<string, object>();

plannerTask1.Assignments.AdditionalData.Add("84b38502-7293-4702-aaa0-c0898dc8e51f", new NewAssignment());

 var plannerTaskRes = await gsClient.Planner.Tasks.PostAsync(plannerTask1 );

   public class NewAssignment
    {

        [JsonPropertyName("@odata.type")]
        public string OData { get; set; } = "#microsoft.graph.plannerAssignment";

        [JsonPropertyName("orderhint")]
        public string OrderHint { get; set; } = " !";
    }

Answer 1

I managed to get it working. Upgrade the graphServiceClient to 5.3 and change the custom class NewAssignment to class in graphClient Assignment (notice it is singular)

then you can do the following:

string tenentId = "xxx";
string clientId = "xxx";
string clientScret = "xxx";


ClientSecretCredential clientSecretCredential = new ClientSecretCredential(tenentId, clientId, clientScret);

 GraphServiceClient gsClient = new GraphServiceClient(clientSecretCredential);


                var plannerTask1 = new PlannerTask();
                plannerTask1.PlanId = "XXXXXXXX";
                plannerTask1.BucketId = "DDDDDDDDDDDDD";
                plannerTask1.Title = plannerTask.Title + "067";

plannerTask1.Assignments = new PlannerAssignments();
plannerTask1.Assignments.AdditionalData = new Dictionary<string, object>();

plannerTask1.Assignments.AdditionalData.Add("xxx", new PlannerAssignment
                    {
                        OdataType = "#microsoft.graph.plannerAssignment",
                        OrderHint = " !",
                    });

 var plannerTaskRes = await gsClient.Planner.Tasks.PostAsync(plannerTask1 );

Answer 2

Hello @Manoj Pant,

Thanks for reaching out!

This issue occurs if Open Type properties are not of correct types, or the type isn't specified, or they do not contain any properties.

Try using the below code to assign the @odata.type property with value microsoft.graph.plannerAssignment.

public class NewAssignment
{
    [JsonProperty("@odata.type")]
    public string ODataType { get; set; }

    [JsonProperty("orderHint")]
    public string OrderHint { get; set; }

    public NewAssignment()
    {
        ODataType = "#microsoft.graph.plannerAssignment";
        OrderHint = " !";
    }
}

Documnetation reference:

https://learn.microsoft.com/en-us/graph/api/resources/planner-overview?view=graph-rest-1.0#400-bad-request

Hope this helps.

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Answer 3

Hi I also have an issue with Planner API.

When I create a task without categories or assignments, everything is alright.

But after adding categories or assignments, an lambda error occurs.

My codes are like this

var requestBody = new PlannerTask
        {
            PlanId = "[PlanId]",
            BucketId = "[BucketId]",
            Title = title,
            Assignments = new PlannerAssignments(),

            Details = new PlannerTaskDetails {
                Description = Description,
                Checklist = new PlannerChecklistItems {  },
            },
        };

		// without below line, I can create task.
		// I tried with both "PlannerAssignment" class and "NewAssignment" class
        requestBody.Assignments.AdditionalData.Add("[MyUserId]", new PlannerAssignment());

        var newtask = await _userClient.Planner.Tasks.PostAsync(requestBody);

public class NewAssignment
{
    [JsonProperty("@odata.type")]
    public string ODataType { get; set; }

    [JsonProperty("orderHint")]
    public string OrderHint { get; set; }

    public NewAssignment()
    {
        ODataType = "#microsoft.graph.plannerAssignment";
        OrderHint = " !";
    }
}

Anybody has any idea I should check?