令牌无效时，MS Graph .netcore客户端SDK会引发NullReferenceException

问题描述

我正在使用Microsoft Graph .netcore SDK版本3.14向OneDrive for Business发出请求。但是，无论何时有401未经授权的响应，我都会得到NullReferenceException而不是适当的错误响应。我应该如何处理此错误，以确保NullReferenceException的根本原因是由于401？以下是我删除OneDrive订阅的请求示例：

IGraphServiceSubscribedSkusCollectionRequestBuilder subscriptions = this.GetSubscriptions(credentials);
await subscriptions[webhookId]
   .Request()
   .DeleteAsync();

从提琴手那里，我看到响应是401。下面的Ans是NullReferenceException的代码段。它不包含任何信息以指示由于401而失败。

   Object reference not set to an instance of an object.
            
   at Microsoft.Graph.HttpProvider.<SendAsync>d__18.MoveNext()
   at System.Runtime.ExceptionServices.ExceptiondispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Microsoft.Graph.BaseRequest.<SendRequestAsync>d__38.MoveNext()
   at System.Runtime.ExceptionServices.ExceptiondispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Microsoft.Graph.BaseRequest.<SendAsync>d__34`1.MoveNext()
   at System.Runtime.ExceptionServices.ExceptiondispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Microsoft.Graph.SubscriptionRequest.<DeleteAsync>d__4.MoveNext()
   at System.Runtime.ExceptionServices.ExceptiondispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)

解决方法

这是由 SDK 中的错误引起的。请尝试升级到最新版本的sdk，看看问题是否仍然存在。

https://github.com/microsoftgraph/msgraph-sdk-dotnet-core/issues/167

.net-core microsoft-graph-sdks onedrive