<GenericParameter> Element (.NET Native)

Article
2022-10-20

Applies policy to the parameter type of a generic type or method.

Syntax

<GenericParameter Name="generic_parameter_name"
                  Activate="policy_type"
                  Browse="policy_type"
                  Dynamic="policy_type"
                  Serialize="policy_type"
                  DataContractSerializer="policy_type"
                  DataContractJsonSerializer="policy_type"
                  XmlSerializer="policy_type"
                  MarshalObject="policy_type"
                  MarshalDelegate="policy_type"
                  MarshalStructure="policy_type" />

Attributes and Elements

The following sections describe attributes, child elements, and parent elements.

Attributes

Attribute	Attribute type	Description
`Name`	General	Required attribute. The name of the generic parameter. For example, for the generic delegate Func<T1,T2,TResult>, the value of the `Name` attribute is "TResult" to apply runtime policy to the delegate's return value.
`Activate`	Reflection	Optional attribute. Controls runtime access to constructors to enable activation of instances.
`Browse`	Reflection	Optional attribute. Controls querying for information about program elements, but does not enable any runtime access.
`Dynamic`	Reflection	Optional attribute. Controls runtime access to all type members, including constructors, methods, fields, properties, and events, to enable dynamic programming.
`Serialize`	Serialization	Optional attribute. Controls runtime access to constructors, fields, and properties, to enable type instances to be serialized and deserialized by libraries such as the Newtonsoft JSON serializer.
`DataContractSerializer`	Serialization	Optional attribute. Controls policy for serialization that uses the System.Runtime.Serialization.DataContractSerializer class.
`DataContractJsonSerializer`	Serialization	Optional attribute. Controls policy for JSON serialization that uses the System.Runtime.Serialization.Json.DataContractJsonSerializer class.
`XmlSerializer`	Serialization	Optional attribute. Controls policy for XML serialization that uses the System.Xml.Serialization.XmlSerializer class.
`MarshalObject`	Interop	Optional attribute. Controls policy for marshaling reference types to Windows Runtime and COM.
`MarshalDelegate`	Interop	Optional attribute. Controls policy for marshaling delegate types as function pointers to native code.
`MarshalStructure`	Interop	Optional attribute. Controls policy for marshaling value types to native code.

Name attribute

Value	Description
generic_parameter_name	Required attribute. The name of the generic type parameter. For example, for the generic delegate Func<T1,T2,TResult>, a generic_parameter_name value of "TResult" applies runtime policy to the delegate's return value.

All other attributes

Value	Description
policy_setting	The setting to apply to this policy type. Possible values are `All`, `Public`, `PublicAndInternal`, `Required Public`, `Required PublicAndInternal`, and `Required All`. For more information, see Runtime Directive Policy Settings.

Child Elements

None.

Parent Elements

Element	Description
<Method>	Applies runtime reflection policy to a constructor or method.
<Type>	Applies runtime reflection policy to a particular type, such as a class or structure.

Remarks

The <GenericParameter> element is a child of either the <Method> or <Type> element and is used to apply policy to a particular generic type parameter, which is specified by its name in the generic type or method signature.

The <GenericParameter> element is most useful when used with serializers. The following example uses the <GenericParameter> element to apply policy to the type T in calls to the NewtonSoft JSON serializer's JsonConvert.DeserializeObject<T>(String) method overloads.

<Directives xmlns="http://schemas.microsoft.com/netfx/2013/01/metadata">
   <Type Name="Newtonsoft.Json.JsonConvert" >
      <Method Name="DeserializeObject{T}">
         <GenericParameter Name="T" Serialize="Required All" />
      </Method>
   </Type>
</Directives>

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