ServiceKnownTypeAttribute Constructors

public:
 ServiceKnownTypeAttribute(System::String ^ methodName);

public ServiceKnownTypeAttribute(string methodName);

new System.ServiceModel.ServiceKnownTypeAttribute : string -> System.ServiceModel.ServiceKnownTypeAttribute

Public Sub New (methodName As String)

Parameters

Opmerkingen

Gebruik deze constructor bij het toepassen van de ServiceKnownTypeAttribute op een klasse die methoden bevat die bekende typen retourneren.

Zie ook

• DeclaringType
• MethodName

public:
 ServiceKnownTypeAttribute(Type ^ type);

public ServiceKnownTypeAttribute(Type type);

new System.ServiceModel.ServiceKnownTypeAttribute : Type -> System.ServiceModel.ServiceKnownTypeAttribute

Public Sub New (type As Type)

Parameters

Voorbeelden

In het volgende voorbeeld wordt het ServiceKnownTypeAttribute kenmerk toegepast op een interface waarin het kenmerk het type specificeert dat moet worden opgenomen.

// Apply the ServiceKnownTypeAttribute to the
// interface specifying the type to include. Apply
// the attribute more than once if needed.
[ServiceKnownType(typeof(Widget))]
[ServiceKnownType(typeof(Machine))]
[ServiceContract()]
public interface ICatalog2
{
    // Any object type can be inserted into a Hashtable. The
    // ServiceKnownTypeAttribute allows you to include those types
    // with the client code.
    [OperationContract]
    Hashtable GetItems();
}

' Apply the ServiceKnownTypeAttribute to the 
' interface specifying the type to include. Apply the attribute
' more than once, if needed.
<ServiceKnownType(GetType(Widget)), ServiceKnownType(GetType(Machine)), _
 ServiceContract()>  _
Public Interface ICalculator2
    ' Any object type can be inserted into a Hashtable. The 
    ' ServiceKnownTypeAttribute allows you to include those types
    ' with the client code.
    <OperationContract()>  _
    Function GetItems() As Hashtable 
End Interface

Opmerkingen

De ServiceKnownTypeAttribute kan meerdere keren worden toegepast op een methode, waarbij elke toepassing een ander bekend type noemt dat mogelijk aanwezig is in de objectgrafiek die door de methode wordt geretourneerd.

public:
 ServiceKnownTypeAttribute(System::String ^ methodName, Type ^ declaringType);

public ServiceKnownTypeAttribute(string methodName, Type declaringType);

new System.ServiceModel.ServiceKnownTypeAttribute : string * Type -> System.ServiceModel.ServiceKnownTypeAttribute

Public Sub New (methodName As String, declaringType As Type)

Parameters

Voorbeelden

In het volgende voorbeeld wordt het ServiceKnownTypeAttribute kenmerk toegepast op een interface waarin het kenmerk een methodenaam en een declarerend type opgeeft.

// Define a service contract and apply the ServiceKnownTypeAttribute
// to specify types to include when generating client code.
// The types must have the DataContractAttribute and DataMemberAttribute
// applied to be serialized and deserialized. The attribute specifies the
// name of a method (GetKnownTypes) in a class (Helper) defined below.
[ServiceKnownType("GetKnownTypes", typeof(Helper))]
[ServiceContract()]
public interface ICatalog
{
    // Any object type can be inserted into a Hashtable. The
    // ServiceKnownTypeAttribute allows you to include those types
    // with the client code.
    [OperationContract]
    Hashtable GetItems();
}

// This class has the method named GetKnownTypes that returns a generic IEnumerable.
static class Helper
{
    public static IEnumerable<Type> GetKnownTypes(ICustomAttributeProvider provider)
    {
        System.Collections.Generic.List<System.Type> knownTypes =
            new System.Collections.Generic.List<System.Type>();
        // Add any types to include here.
        knownTypes.Add(typeof(Widget));
        knownTypes.Add(typeof(Machine));
        return knownTypes;
    }
}

[DataContract()]
public class Widget
{
    [DataMember]
    public string Id;
    [DataMember]
    public string Catalog;
}

[DataContract()]
public class Machine : Widget
{
    [DataMember]
    public string Maker;
}

' Define a service contract and apply the ServiceKnownTypeAttribute
' to specify types to include when generating client code. 
' The types must have the DataContractAttribute and DataMemberAttribute
' applied to be serialized and deserialized. The attribute specifies the 
' name of a method (GetKnownTypes) in a class (Helper) defined below.
<ServiceKnownType("GetKnownTypes", GetType(Helper)), ServiceContract()>  _
Public Interface ICalculator
    ' Any object type can be inserted into a Hashtable. The 
    ' ServiceKnownTypeAttribute allows you to include those types
    ' with the client code.
    <OperationContract()>  _
    Function GetItems() As Hashtable 
End Interface 

' This class has the method named GetKnownTypes that returns a generic IEnumerable.
Friend Class Helper
    Public Shared  Function GetKnownTypes(provider As ICustomAttributeProvider) _
     As IEnumerable(of Type) 
        Dim knownTypes As List(Of Type) = New List(Of Type)
        ' Add any types to include here.
        knownTypes.Add(GetType(Widget))
        knownTypes.Add(GetType(Machine))
        Return knownTypes
    End Function 
End Class 

<DataContract()>  _
Public Class Widget
    <DataMember()>  _
    Public Id As String
    <DataMember()>  _
    Public Catalog As String
End Class 

<DataContract()>  _
Public Class Machine
    Inherits Widget
    <DataMember()>  _
    Public Maker As String
End Class

Zie ook

• DeclaringType
• MethodName