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KnownTypeAttribute Class

Specifies types that should be recognized by the DataContractSerializer when serializing or deserializing a given type.

System.Object
  System.Attribute
    System.Runtime.Serialization.KnownTypeAttribute

Namespace:  System.Runtime.Serialization
Assembly:  System.Runtime.Serialization (in System.Runtime.Serialization.dll)

[<Sealed>]
[<AttributeUsageAttribute(AttributeTargets.Class|AttributeTargets.Struct, Inherited = true, 
    AllowMultiple = true)>]
type KnownTypeAttribute =  
    class 
        inherit Attribute 
    end

The KnownTypeAttribute type exposes the following members.

  NameDescription
Public methodSupported by Portable Class LibraryKnownTypeAttribute(String)Initializes a new instance of the KnownTypeAttribute class with the name of a method that returns an IEnumerable of known types.
Public methodSupported by Portable Class LibraryKnownTypeAttribute(Type)Initializes a new instance of the KnownTypeAttribute class with the specified type.
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  NameDescription
Public propertySupported by Portable Class LibraryMethodNameGets the name of a method that will return a list of types that should be recognized during serialization or deserialization.
Public propertySupported by Portable Class LibraryTypeGets the type that should be recognized during serialization or deserialization by the DataContractSerializer.
Public propertyTypeIdWhen implemented in a derived class, gets a unique identifier for this Attribute. (Inherited from Attribute.)
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  NameDescription
Public methodSupported by Portable Class LibraryEqualsInfrastructure. Returns a value that indicates whether this instance is equal to a specified object. (Inherited from Attribute.)
Public methodSupported by Portable Class LibraryGetHashCodeReturns the hash code for this instance. (Inherited from Attribute.)
Public methodSupported by Portable Class LibraryGetTypeGets the Type of the current instance. (Inherited from Object.)
Public methodIsDefaultAttributeWhen overridden in a derived class, indicates whether the value of this instance is the default value for the derived class. (Inherited from Attribute.)
Public methodMatchWhen overridden in a derived class, returns a value that indicates whether this instance equals a specified object. (Inherited from Attribute.)
Public methodSupported by Portable Class LibraryToStringReturns a string that represents the current object. (Inherited from Object.)
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  NameDescription
Explicit interface implemetationPrivate method_Attribute.GetIDsOfNamesMaps a set of names to a corresponding set of dispatch identifiers. (Inherited from Attribute.)
Explicit interface implemetationPrivate method_Attribute.GetTypeInfoRetrieves the type information for an object, which can be used to get the type information for an interface. (Inherited from Attribute.)
Explicit interface implemetationPrivate method_Attribute.GetTypeInfoCountRetrieves the number of type information interfaces that an object provides (either 0 or 1). (Inherited from Attribute.)
Explicit interface implemetationPrivate method_Attribute.InvokeProvides access to properties and methods exposed by an object. (Inherited from Attribute.)
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Apply the KnownTypeAttribute attribute to a type to indicate to the DataContractSerializer types that should be recognized when serializing or deserializing an instance of the type to which the attribute is applied. This attribute could also be recognized by other serializers that understand data contracts.

NoteNote

In your code, you can use the word KnownType instead of the longer KnownTypeAttribute.

You can either apply exactly one KnownTypeAttribute instance with the MethodName property set, or one or more KnownTypeAttribute instances with the Type property set.

The following example shows a type named Person and a type named IDInformation that should be recognized when serializing or deserializing the Person type.

No code example is currently available or this language may not be supported.

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5, 3.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Portable Class Library

Supported in: Portable Class Library

Supported in: Windows Phone 8.1

Supported in: Windows Phone Silverlight 8.1

Supported in: Windows Phone Silverlight 8

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.
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