CodeAccessSecurityAttribute Class



This API is now obsolete.

Specifies the base attribute class for code access security.

public ref class CodeAccessSecurityAttribute abstract : System::Security::Permissions::SecurityAttribute
[System.AttributeUsage(System.AttributeTargets.Assembly | System.AttributeTargets.Class | System.AttributeTargets.Constructor | System.AttributeTargets.Method | System.AttributeTargets.Struct, AllowMultiple=true, Inherited=false)]
[System.Obsolete("CAS support is not available with Silverlight applications.")]
public abstract class CodeAccessSecurityAttribute : System.Security.Permissions.SecurityAttribute
type CodeAccessSecurityAttribute = class
    inherit SecurityAttribute
Public MustInherit Class CodeAccessSecurityAttribute
Inherits SecurityAttribute


The following example shows a permission attribute derived from the CodeAccessSecurityAttribute class.

using namespace System;
using namespace System::IO;
using namespace System::Runtime::Remoting;
using namespace System::Security;
using namespace System::Security::Permissions;
using namespace System::Reflection;
using namespace MyPermission;

// Use the command line option '/keyfile' or appropriate project settings to sign this assembly.
public ref class NameIdPermissionAttribute: public CodeAccessSecurityAttribute
   String^ m_Name;
   bool m_unrestricted;

   NameIdPermissionAttribute( SecurityAction action )
      : CodeAccessSecurityAttribute( action )
      m_Name = nullptr;
      m_unrestricted = false;

   property String^ Name
      String^ get()
         return m_Name;

      void set( String^ value )
         m_Name = value;

   virtual IPermission^ CreatePermission() override
      if ( m_unrestricted )
         throw gcnew ArgumentException( "Unrestricted permissions not allowed in identity permissions." );
         if ( m_Name == nullptr )
                  return gcnew NameIdPermission( PermissionState::None );
         return gcnew NameIdPermission( m_Name );


using System;
using System.IO;
using System.Runtime.Remoting;
using System.Security;
using System.Security.Permissions;
using System.Reflection;
using MyPermission;
// Use the command line option '/keyfile' or appropriate project settings to sign this assembly.
[assembly: System.Security.AllowPartiallyTrustedCallersAttribute ()]

namespace MyPermissionAttribute
    [AttributeUsage (AttributeTargets.Method | AttributeTargets.Constructor | AttributeTargets.Class | AttributeTargets.Struct | AttributeTargets.Assembly, AllowMultiple = true, Inherited = false)]
    sealed public class  NameIdPermissionAttribute : CodeAccessSecurityAttribute
        private String m_Name = null;
        private bool m_unrestricted = false;

        public  NameIdPermissionAttribute (SecurityAction action): base( action )

        public String Name
            get { return m_Name; }
            set { m_Name = value; }

        public override IPermission CreatePermission ()
            if (m_unrestricted)
                throw new ArgumentException ("Unrestricted permissions not allowed in identity permissions.");
                if (m_Name == null)
                    return new  NameIdPermission (PermissionState.None);

                return new  NameIdPermission (m_Name);
Imports System.IO
Imports System.Runtime.Remoting
Imports System.Security
Imports System.Security.Permissions
Imports System.Reflection
Imports MyPermission

' Use the command line option '/keyfile' or appropriate project settings to sign this assembly.
<Assembly: System.Security.AllowPartiallyTrustedCallersAttribute()> 
Namespace MyPermissionAttribute

    <AttributeUsage(AttributeTargets.All, AllowMultiple:=True, Inherited:=False)> Public NotInheritable Class NameIdPermissionAttribute
        Inherits CodeAccessSecurityAttribute
        Private m_Name As String = Nothing
        Private m_unrestricted As Boolean = False

        Public Sub New(ByVal action As SecurityAction)
        End Sub

        Public Property Name() As String
                Return m_name
            End Get
            Set(ByVal Value As String)
                m_name = Value
            End Set
        End Property

        Public Overrides Function CreatePermission() As IPermission
            If m_unrestricted Then
                Throw New ArgumentException("Unrestricted permissions not allowed in identity permissions.")
                If m_name Is Nothing Then
                    Return New NameIdPermission(PermissionState.None)
                End If
                Return New NameIdPermission(m_name)
            End If
        End Function 'CreatePermission
    End Class
End Namespace



Partially trusted code is no longer supported. This attribute has no effect in .NET Core.

This attribute class associates a SecurityAction, for example, Demand, with a custom security attribute.

The types that derive from CodeAccessSecurityAttribute are used to help restrict access to resources or securable operations.

The security information declared by a security attribute is stored in the metadata of the attribute target and is accessed by the system at run time. Security attributes are used only for declarative security. Use the corresponding permission class derived from CodeAccessPermission for imperative security.

Notes to Implementers

All permission attributes derived from this class must have only a single constructor that takes a SecurityAction as its only parameter.



Initializes a new instance of CodeAccessSecurityAttribute with the specified SecurityAction.



Gets or sets a security action.

(Inherited from SecurityAttribute)

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

(Inherited from Attribute)

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

(Inherited from SecurityAttribute)



When overridden in a derived class, creates a permission object that can then be serialized into binary form and persistently stored along with the SecurityAction in an assembly's metadata.

(Inherited from SecurityAttribute)

Returns a value that indicates whether this instance is equal to a specified object.

(Inherited from Attribute)

Returns the hash code for this instance.

(Inherited from Attribute)

Gets the Type of the current instance.

(Inherited from Object)

When overridden in a derived class, indicates whether the value of this instance is the default value for the derived class.

(Inherited from Attribute)

When overridden in a derived class, returns a value that indicates whether this instance equals a specified object.

(Inherited from Attribute)

Creates a shallow copy of the current Object.

(Inherited from Object)

Returns a string that represents the current object.

(Inherited from Object)

Explicit Interface Implementations

_Attribute.GetIDsOfNames(Guid, IntPtr, UInt32, UInt32, IntPtr)

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

(Inherited from Attribute)
_Attribute.GetTypeInfo(UInt32, UInt32, IntPtr)

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

(Inherited from Attribute)

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

(Inherited from Attribute)
_Attribute.Invoke(UInt32, Guid, UInt32, Int16, IntPtr, IntPtr, IntPtr, IntPtr)

Provides access to properties and methods exposed by an object.

(Inherited from Attribute)

Applies to

See also