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Showing content from https://docs.microsoft.com/en-us/windows/uwp/dotnet-native/namespace-element-net-native below:

<Namespace> Element (.NET Native) - UWP applications

<Namespace> Element (.NET Native)

In this article

Applies runtime reflection policy to all the types in a specified namespace.

Syntax

<Namespace Name="namespace_name"
           Activate="policy_type"
           Browse="policy_type"
           Dynamic="policy_setting"
           Serialize="policy_setting"
           DataContractSerializer="policy_setting"
           DataContractJsonSerializer="policy_setting"
           XmlSerializer="policy_setting"
           MarshalObject="policy_setting"
           MarshalDelegate="policy_setting"
           MarshalStructure="policy_setting" />

Attributes and Elements

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

Attributes Attribute Attribute type Description Name General Required attribute. Specifies the name of the namespace. 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 structures to native code. Name attribute Value Description namespace_name The namespace name. If the <Namespace> element is a child of an <Application>, <Library>, or <Assembly> element, namespace_name must be a fully qualified namespace name. If the <Namespace> element is a child of another <Namespace> element, namespace_name must be a relative namespace name. All other attributes Value Description policy_setting The setting to apply to this policy type for all types in the namespace. Possible values are All, Auto, Excluded, Public, PublicAndInternal, Required Public, Required PublicAndInternal, and Required All. For more information, see Runtime Directive Policy Settings. Child Elements Element Description <Namespace> Applies runtime reflection policy to all types in a parent namespace. <Type> Applies reflection policy to a type. <TypeInstantiation> Applies reflection policy to a constructed generic type. Parent Elements Element Description <Application> Serves as a container for application-wide types and type members whose metadata is available for reflection at run time. The <Application> element can have zero, one, or more <Assembly> elements. <Assembly> Applies runtime reflection policy to all the types in a specified assembly. <Library> Defines the assembly that contains types and type members whose metadata is available for reflection at run time. The <Library> element can have zero or one <Assembly> element. <Namespace> Applies reflection policy to all types in a parent namespace.

The Activate, Browse, Dynamic, and Serialize attributes are all optional. If none are present, the <Namespace> element serves only as a container for child elements. If they are present, the <Namespace> element applies runtime reflection policy to all the types in the specified namespace.

When it is a child of the <Assembly> element, the <Namespace> element overrides the runtime reflection policy defined by the <Assembly> element.