问题
Im writing an OData webservice with C# and I need some advice on how to handle invalid requests? An example of an error would be if a customer requested a service on an item they no longer own. I would idealy like to report back to the customer exactly why it is invalid as there are multiple possible reasons.
Many thanks
回答1:
I would recommend using FaultContracts as part of the OperationContract. You can define them just like DataContracts, and handle exceptions just like a custom exception.
[OperationContract]
[FaultContract(typeof(ItemNotOwned))]
Item GetItem(int ItemId);
You would define ItemNotOwned as a seperate contract definition.
Check it out on MSDN: http://msdn.microsoft.com/en-us/library/ms733841.aspx#Y323
回答2:
Just throw an exception with the message containing that information. The exception will be serialized to the response sent to the client. If you don't care about the response status code, any exception will do and the client will recieve 500 (Internal Server Error). If you want a specific status code throw an instance of DataServiceException.
回答3:
Look at using QueryInterceptors and ChangeInterceptors
http://robbincremers.me/2012/01/24/wcf-rest-service-with-odata-and-entity-framework-with-client-context-custom-operations-and-operation-interceptors/
来源：https://stackoverflow.com/questions/6508003/invalid-request-handling-in-odata