Microsoft Graph Api - Create Education Assignment返回"20132“错误

Question

我想创建一个特定的作业类。

在Graph Explorer中，

https://graph.microsoft.com/beta/education/classes/{classId}/assignments

这个请求运行得很好。

但在我的C#代码中，

var assignInfo = new EducationAssignment
            {

                DisplayName = "test",
                
                DueDateTime = DateTimeOffset.Parse("2020-09-20T18:00:00Z"),
                Instructions = new EducationItemBody
                {
                    ContentType = BodyType.Html,
                    Content = "hi"
                },
                Status = EducationAssignmentStatus.Draft,
                AllowStudentsToAddResourcesToSubmission = true,
                
                AssignTo = new EducationAssignmentClassRecipient
                {

                },
                Grading = new EducationAssignmentPointsGradeType()
                {
                    MaxPoints = 100
                },
                CreatedDateTime = DateTimeOffset.Parse("2020-09-20T12:00:00Z"),
                AssignDateTime = DateTimeOffset.Parse("2020-09-20T13:00:00Z"),
                AssignedDateTime = DateTimeOffset.Parse("2020-09-20T13:00:00Z"),
                
                CloseDateTime = null,
                
                AllowLateSubmissions = true
                
            };

             await graphClient.Education.Classes[pClassId].Assignments
                .Request()
                
                .AddAsync(assignInfo);

发生错误：

{"Code: 20132\r\nMessage: The content of the request is invalid. Common causes are an invalid Content-Type header or no content in the body.\r\nInner error:\r\n\tAdditionalData:\r\n\tdate: 2020-09-20T07:25:14\r\n\trequest-id: d2181119-9116-4f1d-9ed4-d007e2e406d0\r\n\tclient-request-id: d2181119-9116-4f1d-9ed4-d007e2e406d0\r\nClientRequestId: d2181119-9116-4f1d-9ed4-d007e2e406d0\r\n"}

为什么会发生这种情况？我一整天都在思考和尝试。

我试过了

 await graphClient.Education.Classes[pClassId].Assignments
                .Request()
                .Header("Content-Type", "application/json")
                .AddAsync(assignInfo);

但也有同样的错误。

如果只请求displayname元素，结果是相同的。

权限已经处理过了。EduAssignments.ReadWriteBasic，EduAssignments.ReadWrite..等和动态链接库(NuGet包)也是在测试版。

我指的是this document。

我迫切需要帮助..。谢谢。

Answer 1

添加此assignInfo.ODataType = null;可以解决此问题。