WCF数据契约问题

Question

我有这个数据契约：

[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; 
} 

我得到这个错误：

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)

这似乎与上面定义的数据合同，因为如果我把它简化，它返回数据。

给出该错误

的操作方法是：

[OperationContract] 
WhitelistPolicyData GetWhitelistPolicy(); 

Answer 1

我认为必须有SerializationException类型的一个更有意义的内部异常。

我唯一看到的是你的枚举中缺少的[EnumMember]属性。试试这个：

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

查看the docu on msdn的解释。将枚举[DataContract]放在枚举上时，还必须指定[EnumMember]属性。