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应用程序不会期望我的某个商业对象中的某个属性，也不知道该如何处理它。以前我已经通过设置一个KnownTypeAttribute来解决这个问题，就像下面的例子一样，但是在这种情况下它不起作用。

我已经习惯了解决这个问题是这样的：

[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; } 
} 

唯一的区别知道的是，我有稍微不同的结构，像这样：

[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 { } 

我的任何想法非常感谢什么可能是错的！

问候，柯乐

Answer 1

你需要把已知类型属性的基础对象：

[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 { } 

，或者如果你不想与那些attribtues污染您的域模型，你也可以do it in your web.config or use the ServiceKnownType attribute on your Service Contract 。