多项选择题
A.a message filter with a priority of 100 that will forward messages that total between $0 and $500 to Service A
B.a message filter with a priority of 0 that will forward messages that total between $0 and $500 to Service A
C.a message filter with a priority of 0 that will forward all messages to Service B
D.a message filter with a priority of 100 that will forward all messages to Service B
单项选择题 You are creating a Windows Communication Foundation (WCF) service that responds using plain-old XML (POX).You have the following requirements: You must enable the /catalog.svc IItems operation to respond using the POX, JSON, or ATOM formats. You also must ensure that the same URL is used regardless of the result type. You must determine the response format by using the Accepts HTTP header.What should you do?（）
多项选择题 You are developing a Windows Communication Foundation (WCF) service. You write a method named Submit that accepts messages of the type System.ServiceModel.Channels.Message. You need to process the body of the incoming messages multiple times in the method. Which two actions should you perform? (Each correct answer presents part of the solution. Choose two.)（）
单项选择题 A Windows Communication Foundation (WCF) service is generating a separate namespace declaration for each body member of a message contract,even though all body members share the same namespace. You need to simplify the XML representation of your message contract so that the namespace is only declared once. What should you do?（）