AppDomain::DefineDynamicAssembly Method (AssemblyName^, AssemblyBuilderAccess, Evidence^, PermissionSet^, PermissionSet^, PermissionSet^)

 
obsoleteCodeEntityM:System.AppDomain.DefineDynamicAssembly(System.Reflection.AssemblyName,System.Reflection.Emit.AssemblyBuilderAccess)Note: This API is now obsolete.

Defines a dynamic assembly using the specified name, access mode, evidence, and permission requests.

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

public:
[ObsoleteAttribute("Assembly level declarative security is obsolete and is no longer enforced by the CLR by default. See http://go.microsoft.com/fwlink/?LinkID=155570 for more information.")]
virtual AssemblyBuilder^ DefineDynamicAssembly(
	AssemblyName^ name,
	AssemblyBuilderAccess access,
	Evidence^ evidence,
	PermissionSet^ requiredPermissions,
	PermissionSet^ optionalPermissions,
	PermissionSet^ refusedPermissions
) sealed

Parameters

name
Type: System.Reflection::AssemblyName^

The unique identity of the dynamic assembly.

access
Type: System.Reflection.Emit::AssemblyBuilderAccess

The mode in which the dynamic assembly will be accessed.

evidence
Type: System.Security.Policy::Evidence^

The evidence supplied for the dynamic assembly. The evidence is used unaltered as the final set of evidence used for policy resolution.

requiredPermissions
Type: System.Security::PermissionSet^

The required permissions request.

optionalPermissions
Type: System.Security::PermissionSet^

The optional permissions request.

refusedPermissions
Type: System.Security::PermissionSet^

The refused permissions request.

Return Value

Type: System.Reflection.Emit::AssemblyBuilder^

A dynamic assembly with the specified name and features.

Exception Condition
ArgumentNullException

name is null.

ArgumentException

The Name property of name is null.

-or-

The Name property of name begins with white space, or contains a forward or backward slash.

AppDomainUnloadedException

The operation is attempted on an unloaded application domain.

The permission requests specified for requiredPermissions, optionalPermissions, and refusedPermissions are used only if evidence is also supplied, or if the dynamic assembly is saved and reloaded into memory.

System_CAPS_noteNote

During the development of code that emits dynamic assemblies, it is recommended that you include SecurityPermissionFlag::SkipVerification in refusedPermissions. Including SkipVerification in the refusedPermissions parameter ensures that the MSIL is verified. A limitation of this technique is that it also causes SecurityException to be thrown when used with code that demands full trust.

Only fully trusted callers can supply their evidence when defining a dynamic Assembly. The runtime will map the Evidence through the security policy to determine the granted permissions. Partially trusted callers must supply a null evidence. If evidence is null, the runtime copies the permission sets, that is, the current grant and deny sets, from the caller's Assembly to the dynamic Assembly being defined and marks policy as resolved.

If the dynamic Assembly is saved to disk, subsequent loads will get grants based on policies associated with the location where the Assembly was saved.

This method should only be used to define a dynamic assembly in the current application domain. For more information, see the Load(AssemblyName^) method overload.

The following sample demonstrates the DefineDynamicAssembly method and AssemblyResolve event.

For this code example to run, you must provide the fully qualified assembly name. For information about how to obtain the fully qualified assembly name, see Assembly Names.

using namespace System;
using namespace System::Reflection;
using namespace System::Reflection::Emit;
ref class Test
{
public:
   static void InstantiateMyDynamicType( AppDomain^ domain )
   {
      try
      {

         // You must supply a valid fully qualified assembly name here.
         domain->CreateInstance( "Assembly text name, Version, Culture, PublicKeyToken", "MyDynamicType" );
      }
      catch ( Exception^ e ) 
      {
         Console::WriteLine( e->Message );
      }

   }

   static Assembly^ MyResolveEventHandler( Object^ sender, ResolveEventArgs^ args )
   {
      return DefineDynamicAssembly( dynamic_cast<AppDomain^>(sender) );
   }

   static Assembly^ DefineDynamicAssembly( AppDomain^ domain )
   {

      // Build a dynamic assembly using Reflection Emit API.
      AssemblyName^ assemblyName = gcnew AssemblyName;
      assemblyName->Name = "MyDynamicAssembly";
      AssemblyBuilder^ assemblyBuilder = domain->DefineDynamicAssembly( assemblyName, AssemblyBuilderAccess::Run );
      ModuleBuilder^ moduleBuilder = assemblyBuilder->DefineDynamicModule( "MyDynamicModule" );
      TypeBuilder^ typeBuilder = moduleBuilder->DefineType( "MyDynamicType", TypeAttributes::Public );
      ConstructorBuilder^ constructorBuilder = typeBuilder->DefineConstructor( MethodAttributes::Public, CallingConventions::Standard, nullptr );
      ILGenerator^ ilGenerator = constructorBuilder->GetILGenerator();
      ilGenerator->EmitWriteLine( "MyDynamicType instantiated!" );
      ilGenerator->Emit( OpCodes::Ret );
      typeBuilder->CreateType();
      return assemblyBuilder;
   }

};

int main()
{
   AppDomain^ currentDomain = AppDomain::CurrentDomain;
   Test::InstantiateMyDynamicType( currentDomain ); // Failed!
   currentDomain->AssemblyResolve += gcnew ResolveEventHandler( Test::MyResolveEventHandler );
   Test::InstantiateMyDynamicType( currentDomain ); // OK!
}

SecurityPermission

to load an assembly with evidence. Associated enumeration: SecurityPermissionFlag::ControlEvidence.

.NET Framework
Available since 1.1
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