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

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

PrincipalPermission Class Definition

Caution

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

Allows checks against the active principal (see IPrincipal) using the language constructs defined for both declarative and imperative security actions. This class cannot be inherited.

public ref class PrincipalPermission sealed : System::Security::IPermission, System::Security::Permissions::IUnrestrictedPermission

[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 PrincipalPermission : System.Security.IPermission, System.Security.Permissions.IUnrestrictedPermission

[System.Serializable]
public sealed class PrincipalPermission : System.Security.IPermission, System.Security.Permissions.IUnrestrictedPermission

[System.Serializable]
[System.Runtime.InteropServices.ComVisible(true)]
public sealed class PrincipalPermission : System.Security.IPermission, System.Security.Permissions.IUnrestrictedPermission

public sealed class PrincipalPermission : System.Security.IPermission, System.Security.Permissions.IUnrestrictedPermission

[<System.Obsolete("Code Access Security is not supported or honored by the runtime.", DiagnosticId="SYSLIB0003", UrlFormat="https://aka.ms/dotnet-warnings/{0}")>]
type PrincipalPermission = class
    interface IPermission
    interface ISecurityEncodable
    interface IUnrestrictedPermission

[<System.Serializable>]
type PrincipalPermission = class
    interface IPermission
    interface IUnrestrictedPermission
    interface ISecurityEncodable

[<System.Serializable>]
[<System.Runtime.InteropServices.ComVisible(true)>]
type PrincipalPermission = class
    interface IPermission
    interface IUnrestrictedPermission
    interface ISecurityEncodable

[<System.Serializable>]
[<System.Runtime.InteropServices.ComVisible(true)>]
type PrincipalPermission = class
    interface IPermission
    interface ISecurityEncodable
    interface IUnrestrictedPermission

type PrincipalPermission = class
    interface IPermission
    interface ISecurityEncodable
    interface IUnrestrictedPermission

Public NotInheritable Class PrincipalPermission
Implements IPermission, IUnrestrictedPermission

Inheritance

Attributes

Implements

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.

By passing identity information (user name and role) to the constructor, PrincipalPermission can be used to demand that the identity of the active principal matches this information.

To match the active IPrincipal and associated IIdentity, both the specified identity and role must match. If null identity string is used, it is interpreted as a request to match any identity. Use of null role string will match any role. By implication, passing null parameter for name or role to PrincipalPermission will match the identity and roles in any IPrincipal. It is also possible to construct a PrincipalPermission that only determines whether the IIdentity represents an authenticated or unauthenticated entity. In this case, name and role are ignored.

Unlike most other permissions, PrincipalPermission does not extend CodeAccessPermission. It does, however, implement the IPermission interface. This is because PrincipalPermission is not a code access permission; that is, it is not granted based on the identity of the executing assembly. Instead, it allows code to perform actions (Demand, Union, Intersect, and so on) against the current user identity in a manner consistent with the way those actions are performed for code access and code identity permissions.

Important

Prior to a demand for principal permission it is necessary to set the current application domain's principal policy to the enumeration value WindowsPrincipal. By default, the principal policy is set to UnauthenticatedPrincipal. If you do not set the principal policy to WindowsPrincipal, a demand for principal permission will fail. The following code should be executed before the principal permission is demanded:

AppDomain.CurrentDomain.SetPrincipalPolicy(PrincipalPolicy.WindowsPrincipal).