序列化不接受我的KnownTypeAttribute,为什么？

Question

我遇到了序列化问题.我的Silverlight应用程序不期望我的某个属性在业务对象中,并且不知道如何处理它.以前我通过设置一个类似下面的例子的KnownTypeAttribute来解决这个问题,但在这种情况下它不起作用.

我曾经这样解决过:

[DataContract(Name = "baseClass")]
public class baseClass { }

[DataContract(Name = "busObj1")]
public class busObj1 : baseClass { }

[DataContract(Name = "busObj2")]
[KnownType(typeof(busObj1))]
public class busObj2 : baseClass
{
    public busObj1 myObj { get; set; }
}

唯一的区别是我的结构略有不同,如下所示:

[DataContract(Name = "baseClass")]
public class baseClass { }

[DataContract(Name = "busObj1")]
public class busObj1 : baseClass { }

[DataContract(Name = "busObj2")]
[KnownType(typeof(busObj1))]
public class busObj2 : baseClass
{
    public busObj1 myObj { get; set; }
}

// This is the class that I want to send via WCF and that cannot be serialized
// because the serializer doesn't expect busObj1.
[DataContract(Name = "busObj3")]
public class busObj3 : busObj2 { }

我非常感谢任何可能出错的想法!

此致,Clas

Answer 1

您需要将已知的type属性放在基础对象上:

[DataContract(Name = "baseClass")]
[KnownType(typeof(busObj1))]
[KnownType(typeof(busObj2))]
[KnownType(typeof(busObj3))]
[KnownType(typeof(busObj4))]
public class baseClass { }

[DataContract(Name = "busObj1")]
public class busObj1 : baseClass { }

[DataContract(Name = "busObj2")]
public class busObj2 : baseClass { }

[DataContract(Name = "busObj3")]
public class busObj3 : busObj1
{
    public busObj2 myObj { get; set; }
}

[DataContract(Name = "busObj4")]
public class busObj4 : busObj3 { }

或者如果您不想使用这些ServiceKnownType属性污染您的域模型,您也可以在web.config中执行此操作,或使用服务合同中的属性.