datacontracts並不等同

Question

我一直在試圖讓一個Web服務在我的本地和調試工作，但它給了我這個錯誤：

System.InvalidOperationException: DataContract for type 'ParticipantDataService.Participant+OutsideAccountDetails+FundCollection' cannot be added to DataContractSet since type 'ParticipantDataService.Participant+FundCollection' with the same data contract name 'ArrayOfFundDetails' in namespace 'http://schemas.datacontract.org/2004/07/ParticipantDataService' is already present and the contracts are not equivalent.

有沒有人在那裏有這個錯誤之前？

謝謝。

Abridged Code below（注意：不是我的代碼，我正在修改以前的開發人員的代碼，誰不在這裏了，還有一個noobie w/web服務在下面的代碼塊中，因爲這個問題似乎與資金現在，我做了所有的「基金」的引用比其他人更明顯。謝謝。）

Namespace COMParticipantNameSpace 
<DataContract(Namespace:="XYZ", Name:="COMParticipant"),       
KnownType(GetType(COMParticipant))> _ 
Public Class COMParticipant 
    Inherits COMResponse 

    Private _FullName As FullName 
    (Other initialized variables...) 

    Protected Friend Sub New... 

    #Region "Properties" 
    <DataMember(Name:="Name", Order:=0)>... 
    <Other DataMembers...> 
    #End Region 

    #Region "Structures" 
    Public Structure FullName... 
      (Other Public Structures) 
    #End Region 
    #Region "Classes" 
    <DataContract(Name:="ParticipantPortfolio")>.... 

    Public Class GroupCollection... 
    End Class 

    <DataContract(Name:="Group")>... 
      <DataMember(Name:="Funds", Order:=6)> _ 
      Public Property Funds() As COMFundCollection 
       Get 
        Return _Funds 
       End Get 
       Set(ByVal value As COMFundCollection) 
        _Funds = value 
       End Set 
      End Property 
    End Class 

    Public Class COMAccountCollection 
     Inherits System.Collections.ObjectModel.Collection(Of COMAccountDetails) 
    End Class 

    <DataContract(Name:="COMAccountDetails")> _ 
    Public Class COMAccountDetails 

     (Other initialized variables...) 
     Private _Funds As COMFundCollection 

     <DataMember Order 0,1,2,3,etc...)>... 

     <DataMember(Name:="Funds", Order:=7)> _ 
     Public Property Funds() As COMFundCollection 
      Get 
       Return _Funds 
      End Get 
      Set(ByVal value As COMFundCollection) 
       _Funds = value 
      End Set 
     End Property 

    End Class 

    Public Class COMFundCollection 
     Inherits System.Collections.ObjectModel.Collection(Of COMFundDetails) 
    End Class 

    Public Class OutsideAccountCollection 
    End Class 

    <DataContract(Name:="OutsideAccountDetails")> _ 
     Public Class OutsideAccountDetails 

     (Other initialized variables...) 
     Private _Funds As FundCollection 

     <Order 1, 2, 3, etc...> 

     <DataMember(Name:="Funds", Order:=15)> _ 
     Public Property Funds() As FundCollection 
      Get 
       Return _Funds 
      End Get 
      Set(ByVal value As FundCollection) 
       _Funds = value 
      End Set 
     End Property 

     Public Class FundCollection 
      Inherits System.Collections.ObjectModel.Collection(Of FundDetails) 
     End Class 

     <DataContract(Name:="FundDetails")>... 

    End Class 

    Public Class TransactionTypeCollection 
     Inherits System.Collections.ObjectModel.Collection(Of TransactionTypeDetail) 
    End Class 
    Public Class TransactionTypeDetail... 
    Public Class TransactionCollection... 

    <DataContract(Name:="Transaction")> _ 
    Public Class Transaction 

     (Other initialized variables...) 
     Private _Funds As TransactionFundCollection 

     <DataMember Order 1,2,3,etc ...> 

     <DataMember(Name:="Funds", Order:=7)> _ 
     Public Property Funds() As TransactionFundCollection 
      Get 
       Return _Funds 
      End Get 
      Set(ByVal value As TransactionFundCollection) 
       _Funds = value 
      End Set 
     End Property 

    End Class 
    Public Class TransactionFundCollection 
     Inherits System.Collections.ObjectModel.Collection(Of TransactionFundDetails) 
    End Class 

    #End Region 
    End Class 

    End Namespace} 

Answer 1

雖然不是解決你的問題，我有同樣的錯誤消息。所以，我認爲這對其他人來說很有用。在我看來，它與鏈式繼承有關。

我有一個基類稱爲DerivedTypes（很像這裏描述：Generally accepted way to avoid KnownType attribute for every derived class），調用擴展方法來確定其繼承人的靜態方法。

如果A：B，B：C，那麼C應該是這樣的：

[DataContract] 
[KnownType("DerivedTypes")] 
public class C { 
    internal static Type[] DerivedTypes() { 
    typeof(C).GetDerivedTypes(); 
    } 
} 

調用B.DerivedTypes（）會（錯誤地）獲得太多的類型，因爲它會調用typeof(C).GetDerivedTypes() 。這在我的案例中引發了同樣的錯誤。

除非B是：

[DataContract] 
[KnownType("DerivedTypes")] 
public class B : C { 
    internal **new** static Type[] DerivedTypes() { 
    typeof(B).GetDerivedTypes(); 
    } 
} 

沒有 '**' 自然。現在，如果遇到類型B，B.DerivedTypes（）將不會對其父進行調用。由於A沒有子類，因此不需要KnownType屬性。

順便說一句，我對擴展方法所做的修改是擴展方法使用了類型的程序集（所以Assembly.GetAssembly(baseType)），並且我爲了測試目的而將內部靜態方法做了。私人也應該沒問題。