我在行小部件中创建了一个导航栏小部件和一个MaterialApp，我想从导航栏中访问MaterialApp路由。问题是导航栏上下文对MaterialApp路线一无所知。知道如何实现吗？！
The provider for the source IQueryable doesn't implement IDbAsyncQueryProvider. Only providers that implement IDbAsyncQueryProvider can be used for Entity Framework asynchronous operations. For more details see http://go.microsoft.com/fwlink/?LinkId=287068."}