ServiceKnownTypeAttribute Class
[ This article is for Windows Phone 8 developers. If you’re developing for Windows 10, see the latest documentation. ]
Specifies known types to be used by a service when serializing or deserializing.
Assembly: System.ServiceModel (in System.ServiceModel.dll)
The ServiceKnownTypeAttribute type exposes the following members.
| Name | Description | |
|---|---|---|
 | ServiceKnownTypeAttribute(String) | Initializes a new instance of the ServiceKnownTypeAttribute class and specifies the name of a method that returns the known types. |
| ServiceKnownTypeAttribute(Type) | Initializes a new instance of the ServiceKnownTypeAttribute class with the specified known type. |
| ServiceKnownTypeAttribute(String, Type) | Initializes a new instance of the ServiceKnownTypeAttribute class with the name of a method that returns the known types and the type that contains the method (or methods) that returns the known types. |
| Name | Description | |
|---|---|---|
 | DeclaringType | Gets the type that contains the methods that return the known types. |
| MethodName | Gets the name of a method that returns the collection of known types. |
| Type | The known type that can be included in an object graph. |
| Name | Description | |
|---|---|---|
| Equals | Infrastructure. Returns a value that indicates whether this instance is equal to a specified object. (Inherited from Attribute.) |
 | Finalize | Allows an object to try to free resources and perform other cleanup operations before the Object is reclaimed by garbage collection. (Inherited from Object.) |
| GetHashCode | Returns the hash code for this instance. (Inherited from Attribute.) |
| GetType | Gets the Type of the current instance. (Inherited from Object.) |
| Match | When overridden in a derived class, returns a value that indicates whether this instance equals a specified object. (Inherited from Attribute.) |
| MemberwiseClone | Creates a shallow copy of the current Object. (Inherited from Object.) |
| ToString | Returns a string that represents the current object. (Inherited from Object.) |
The ServiceKnownTypeAttribute is intended for use when creating Windows Phone service contracts (interfaces that define the service and its methods). The known types are types that may be present in an object graph when serialization or deserialization occurs.
To use the MethodName property, create a class that contains a method (or methods) that returns an array of types (each being a known type). When applying the attribute, set the methodName to the name of a method that returns the list of types and set the declaringType to the type that contains the method. The method must return a type that implements the IEnumerable<T> interface. The method must also include a parameter of type ICustomAttributeProvider.
You can also apply the attribute several times to an interface, class, or method, each time specifying a new known type.
 Note: |
|---|
You can use the word ServiceKnownType in your Microsoft Visual Basic or C# code instead of the longer ServiceKnownTypeAttribute. |
Capabilities
If you use this API in your app, you must specify the following capabilities in the app manifest. Otherwise, your app might not work correctly or it might exit unexpectedly.
ID_CAP_NETWORKING | Windows Phone 8, Windows Phone OS 7.1 |
For more info, see App capabilities and hardware requirements for Windows Phone 8.