TypeBuilder.AddDeclarativeSecurity Method (SecurityAction, PermissionSet)


Adds declarative security to this type.

Namespace:   System.Reflection.Emit
Assembly:  mscorlib (in mscorlib.dll)

Public Sub AddDeclarativeSecurity (
	action As SecurityAction,
	pset As PermissionSet


Type: System.Security.Permissions.SecurityAction

The security action to be taken such as Demand, Assert, and so on.

Type: System.Security.PermissionSet

The set of permissions the action applies to.

Exception Condition

The action is invalid (RequestMinimum, RequestOptional, and RequestRefuse are invalid).


The containing type has been created using CreateType.


The permission set pset contains an action that was added earlier by AddDeclarativeSecurity.


pset is null.

AddDeclarativeSecurity may be called several times with each call specifying a security action (such as Demand, Assert, or Deny) and a set of permissions that apply to the action.


In the .NET Framework versions 1.0, 1.1, and 2.0, the declarative security attributes applied to a type by using this method are stored in the old XML metadata format.

The following example demonstrates the use of the AddDeclarativeSecurity method to add a security demand for SecurityPermission with the SecurityPermissionFlag.ControlEvidence flag to a dynamic type named MyDynamicClass, in an assembly named EmittedExample.dll. The example produces no console output; after you run it, you can use Ildasm.exe (IL Disassembler) to examine EmittedExample.dll. In MyDynamicClass, open the .class public auto ansi statement to see the declarative permission.

Imports System
Imports System.Reflection
Imports System.Reflection.Emit
Imports System.Security
Imports System.Security.Permissions

Namespace CustomAttribute_Sample

   Class MyApplication

      Shared Sub Main()
         ' Create a simple name for the assembly; create the assembly and the module.        
         Dim myAssemblyName As New AssemblyName("EmittedAssembly")
         Dim myAssemblyBuilder As AssemblyBuilder = _
                  AppDomain.CurrentDomain.DefineDynamicAssembly( _
                          myAssemblyName, AssemblyBuilderAccess.RunAndSave)
         Dim myModuleBuilder As ModuleBuilder = _
                  myAssemblyBuilder.DefineDynamicModule("EmittedAssembly", "EmittedAssembly.dll")

         ' Define a public class named "MyDynamicClass" in the assembly.
         Dim myTypeBuilder As TypeBuilder = _
                  myModuleBuilder.DefineType("MyDynamicClass", TypeAttributes.Public)

         ' Create a permission set and add a security permission
         ' with the ControlEvidence flag.
         Dim myPermissionSet As New PermissionSet(PermissionState.None)
         Dim ce As New SecurityPermission(SecurityPermissionFlag.ControlEvidence)

         ' Add the permission set to the MyDynamicClass type,
         ' as a declarative security demand.
         myTypeBuilder.AddDeclarativeSecurity(SecurityAction.Demand, myPermissionSet)

         Dim myType As Type = myTypeBuilder.CreateType()
      End Sub 
   End Class 
End Namespace 

.NET Framework
Available since 1.1
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