WCF數據契約問題

Question

我有這個數據契約：

[DataContract(Namespace = Constants.ServiceNamespace)] 
public enum UserEntityType 
{ 
    User = 0, 
    Group = 1, 
    IPAddress = 2 
} 

[DataContract(Namespace = Constants.ServiceNamespace)] 
//[KnownType(typeof(UserEntity))] 
public class UserEntity 
{ 
    [DataMember] 
    public UserEntityType EntityType; 
    [DataMember] 
    public string Value; 
} 

[DataContract(Namespace = Constants.ServiceNamespace)] 
public class TemporaryPolicyData 
{ 
    [DataMember] 
    public DateTime EndTime; 
    [DataMember] 
    public string URL; 
} 

[DataContract(Namespace = Constants.ServiceNamespace)] 
//[KnownType(typeof(TemporaryPolicyData))] 
//[KnownType(typeof(UserEntity))] 
public class TemporaryWhitelistData 
{ 
    [DataMember] 
    public UserEntity User; 
    [DataMember] 
    public TemporaryPolicyData Data; 
} 

[DataContract(Namespace = Constants.ServiceNamespace)] 
//[KnownType(typeof(TemporaryWhitelistData))] 
//[KnownType(typeof(UserEntity))] 
public class WhitelistPolicyData 
{ 
    [DataMember] 
    public IEnumerable<TemporaryWhitelistData> TemporaryData; 
    [DataMember] 
    public IEnumerable<string> Websites; 
    [DataMember] 
    public IEnumerable<UserEntity> Users; 
} 

我得到這個錯誤：

An unhandled exception of type 'System.ServiceModel.CommunicationException' occurred in mscorlib.dll

Additional information: There was an error reading from the pipe: The pipe has been ended. (109, 0x6d)

這似乎與上面定義的數據合同，因爲如果我把它簡化，它返回數據。

給出該錯誤

的操作方法是：

[OperationContract] 
WhitelistPolicyData GetWhitelistPolicy(); 

Answer 1

我認爲必須有SerializationException類型的一個更有意義的內部異常。

我唯一看到的是你的枚舉中缺少的[EnumMember]屬性。試試這個：

[DataContract] 
public enum UserEntityType 
{ 
    [EnumMember] 
    User = 0, 
    [EnumMember] 
    Group = 1, 
    [EnumMember] 
    IPAddress = 2 
} 

查看the docu on msdn的解釋。將枚舉[DataContract]放在枚舉上時，還必須指定[EnumMember]屬性。