c# - 为什么我不能在同一个类上使用 WCF DataContract 和 ISerializable？

Question

我有一个类需要能够序列化为 SQLServer session 变量并可通过 WCF 服务使用。我声明如下

namespace MyNM
{
[Serializable] 
[DataContract(Name = "Foo", Namespace = "http://www.mydomain.co.uk")]

public class Foo : IEntity, ISafeCopy<Foo>
{
    [DataMember(Order = 0)] 
    public virtual Guid Id { get; set; }

    [DataMember(Order = 1)] 
    public virtual string a { get; set; }

    DataMember(Order = 2)]
    public virtual Bar c { get; set; }

    /* ISafeCopy implementation */
}


[Serializable]
[DataContract(Name = "Bar ", Namespace = "http://www.mydomain.co.uk")]
public class Bar : IEntity, ISafeCopy<Bar>
{
    #region Implementation of IEntity

    DataMember(Order = 0)]
    public virtual Guid Id { get; set; }
    [DataMember(Order = 1)]
    public virtual Baz y { get; set; }

    #endregion

    /* ISafeCopy implementation*/
}


[Serializable]
[DataContract]
public enum Baz
{
    [EnumMember(Value = "one")]
    one,
    [EnumMember(Value = "two")]
    two,
    [EnumMember(Value = "three")]
    three
}

但是当我尝试调用此服务时，我在跟踪日志中收到以下错误。

"System.Runtime.Serialization.InvalidDataContractException: Type 'BarProxybcb100e8617f40ceaa832fe4bb94533c' cannot be ISerializable and have DataContractAttribute attribute."

如果我去掉 Serializable 属性，WCF 服务可以工作，但是当对象不能序列化到 session 时。如果我从 Bar 类中删除 DataContract 属性，WCF 服务将失败并显示

Type 'BarProxy3bb05a31167f4ba492909ec941a54533' with data contract name 'BarProxy3bb05a31167f4ba492909ec941a54533:http://schemas.datacontract.org/2004/07/' is not expected. Add any types not known statically to the list of known types - for example, by using the KnownTypeAttribute attribute or by adding them to the list of known types passed to DataContractSerializer

我已经尝试将 KnownType 属性添加到 foo 类中

[KnownType(typeof(Bar))]

但我仍然得到同样的错误。

谁能帮我解决这个问题？

非常感谢

戴夫

Answer 1

MSDN 上的这个问题可能有帮助:DataContract versus Serializable .

该线程接受的答案:

1. [DataContract] and [Serializable] can be used together.

2. DataContractSerializer understands both of them. If the type is marked with both of them, it will take the projection of [DataContract]

3. Here are the docs on data transfer and serialization in WCF which provide a lot of detail on the serializers and known type: Data Transfer and Serialization