A.以服務為中心
B.支持多種傳輸協(xié)議
C.支持多種消息交換格式
D.具有統(tǒng)一性、安全性和可擴展性

A.[ServiceContract]public Class Service1{[Operation Contract]double Add（double n1，double n2）}
B.[ServiceContract]public Interface IService1{[Operation Contract]double Add（double n1，double n2）}
C.[ServiceContract]public Interface IService1{double Add（double n1，double n2）}
D.public Interface IService1{[Operation Contract]double Add（double n1，double n2）}