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Showing content from https://learn.microsoft.com/en-us/dotnet/api/system.security.permissions.hostprotectionattribute below:

HostProtectionAttribute Class (System.Security.Permissions) | Microsoft Learn

Caution

Code Access Security is not supported or honored by the runtime.

Allows the use of declarative security actions to determine host protection requirements. This class cannot be inherited.

public ref class HostProtectionAttribute sealed : System::Security::Permissions::CodeAccessSecurityAttribute

[System.AttributeUsage(System.AttributeTargets.Assembly | System.AttributeTargets.Class | System.AttributeTargets.Constructor | System.AttributeTargets.Delegate | System.AttributeTargets.Method | System.AttributeTargets.Struct, AllowMultiple=true, Inherited=false)]
[System.Obsolete("Code Access Security is not supported or honored by the runtime.", DiagnosticId="SYSLIB0003", UrlFormat="https://aka.ms/dotnet-warnings/{0}")]
public sealed class HostProtectionAttribute : System.Security.Permissions.CodeAccessSecurityAttribute

[System.AttributeUsage(System.AttributeTargets.Assembly | System.AttributeTargets.Class | System.AttributeTargets.Constructor | System.AttributeTargets.Delegate | System.AttributeTargets.Method | System.AttributeTargets.Struct, AllowMultiple=true, Inherited=false)]
[System.Runtime.InteropServices.ComVisible(true)]
[System.Serializable]
public sealed class HostProtectionAttribute : System.Security.Permissions.CodeAccessSecurityAttribute

[System.AttributeUsage(System.AttributeTargets.Assembly | System.AttributeTargets.Class | System.AttributeTargets.Constructor | System.AttributeTargets.Delegate | System.AttributeTargets.Method | System.AttributeTargets.Struct, AllowMultiple=true, Inherited=false)]
public sealed class HostProtectionAttribute : System.Security.Permissions.CodeAccessSecurityAttribute

[<System.AttributeUsage(System.AttributeTargets.Assembly | System.AttributeTargets.Class | System.AttributeTargets.Constructor | System.AttributeTargets.Delegate | System.AttributeTargets.Method | System.AttributeTargets.Struct, AllowMultiple=true, Inherited=false)>]
[<System.Obsolete("Code Access Security is not supported or honored by the runtime.", DiagnosticId="SYSLIB0003", UrlFormat="https://aka.ms/dotnet-warnings/{0}")>]
type HostProtectionAttribute = class
    inherit CodeAccessSecurityAttribute

[<System.AttributeUsage(System.AttributeTargets.Assembly | System.AttributeTargets.Class | System.AttributeTargets.Constructor | System.AttributeTargets.Delegate | System.AttributeTargets.Method | System.AttributeTargets.Struct, AllowMultiple=true, Inherited=false)>]
[<System.Runtime.InteropServices.ComVisible(true)>]
[<System.Serializable>]
type HostProtectionAttribute = class
    inherit CodeAccessSecurityAttribute

[<System.AttributeUsage(System.AttributeTargets.Assembly | System.AttributeTargets.Class | System.AttributeTargets.Constructor | System.AttributeTargets.Delegate | System.AttributeTargets.Method | System.AttributeTargets.Struct, AllowMultiple=true, Inherited=false)>]
type HostProtectionAttribute = class
    inherit CodeAccessSecurityAttribute

Public NotInheritable Class HostProtectionAttribute
Inherits CodeAccessSecurityAttribute

Inheritance

Attributes

Caution

Code Access Security (CAS) has been deprecated across all versions of .NET Framework and .NET. Recent versions of .NET do not honor CAS annotations and produce errors if CAS-related APIs are used. Developers should seek alternative means of accomplishing security tasks.

This attribute affects only unmanaged applications that host the common language runtime and implement host protection, such as SQL Server. If the code is run in a client application or on a server that is not host-protected, the attribute "evaporates"; it is not detected and therefore not applied. When applied, the security action results in the creation of a link demand based on the host resources the class or method exposes.

Important

The purpose of this attribute is to enforce host-specific programming model guidelines, not security behavior. Although a link demand is used to check for conformance to programming model requirements, the HostProtectionAttribute is not a security permission.

If the host does not have programming model requirements, the link demands do not occur.

This attribute identifies the following:

• Methods or classes that do not fit the host programming model, but are otherwise benign.
• Methods or classes that do not fit the host programming model and could lead to destabilizing server-managed user code.
• Methods or classes that do not fit the host programming model and could lead to a destabilization of the server process itself.

Note

If you are creating a class library that is to be called by applications that may execute in a host protected environment, you should apply this attribute to members that expose HostProtectionResource resource categories. The .NET Framework class library members with this attribute cause only the immediate caller to be checked. Your library member must also cause a check of its immediate caller in the same manner.

Gets or sets a security action.

Gets or sets a value indicating whether external process management is exposed.

Gets or sets a value indicating whether external threading is exposed.

Gets or sets a value indicating whether resources might leak memory if the operation is terminated.

Gets or sets flags specifying categories of functionality that are potentially harmful to the host.

Gets or sets a value indicating whether the security infrastructure is exposed.

Gets or sets a value indicating whether self-affecting process management is exposed.

Gets or sets a value indicating whether self-affecting threading is exposed.

Gets or sets a value indicating whether shared state is exposed.

Gets or sets a value indicating whether synchronization is exposed.

When implemented in a derived class, gets a unique identifier for this Attribute.

Gets or sets a value indicating whether the user interface is exposed.

Gets or sets a value indicating whether full (unrestricted) permission to the resource protected by the attribute is declared.

Maps a set of names to a corresponding set of dispatch identifiers.

Retrieves the type information for an object, which can be used to get the type information for an interface.

Retrieves the number of type information interfaces that an object provides (either 0 or 1).

Provides access to properties and methods exposed by an object.

• Extending Metadata Using Attributes
• Link Demands

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