序列化不接受我的KnownTypeAttribute，爲什麼？

Question

我遇到了序列化問題。我的Silverlight應用程序不會期望我的某個商業對象中的某個屬性，也不知道該如何處理它。以前我已經通過設置一個KnownTypeAttribute來解決這個問題，就像下面的例子一樣，但是在這種情況下它不起作用。

我已經習慣瞭解決這個問題是這樣的：

[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; } 
} 

唯一的區別知道的是，我有稍微不同的結構，像這樣：

[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謝什麼可能是錯的！

問候，柯樂

Answer 1

你需要把已知類型屬性的基礎對象：

[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 { } 

，或者如果你不想與那些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 。