DefineDynamicAssembly Method (AssemblyName, AssemblyBuilderAccess, String)

AppDomain.DefineDynamicAssembly Method (AssemblyName, AssemblyBuilderAccess, String)

Defines a dynamic assembly using the specified name, access mode, and storage directory.

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

'Declaration
Public Function DefineDynamicAssembly ( _
	name As AssemblyName, _
	access As AssemblyBuilderAccess, _
	dir As String _
) As AssemblyBuilder
'Usage
Dim instance As AppDomain 
Dim name As AssemblyName 
Dim access As AssemblyBuilderAccess 
Dim dir As String 
Dim returnValue As AssemblyBuilder 

returnValue = instance.DefineDynamicAssembly(name, _
	access, dir)

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.

dir
Type: System.String

The name of the directory where the assembly will be saved. If dir is Nothing, the directory defaults to the current directory.

Return Value

Type: System.Reflection.Emit.AssemblyBuilder
Represents the dynamic assembly created.

Implements

_AppDomain.DefineDynamicAssembly(AssemblyName, AssemblyBuilderAccess, String)

ExceptionCondition
ArgumentNullException

name is Nothing.

ArgumentException

The Name property of name is Nothing.

-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.

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.

NoteNote:

During the development of code that emits dynamic assemblies, it is recommended that you use an overload of the DefineDynamicAssembly method that specifies evidence and permissions, supply the evidence you want the dynamic assembly to have, and 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.

The following example 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.

Imports System
Imports System.Reflection
Imports System.Reflection.Emit

Module Test

   Sub Main()
      Dim currentDomain As AppDomain = AppDomain.CurrentDomain

      InstantiateMyDynamicType(currentDomain)   'Failed!

      AddHandler currentDomain.AssemblyResolve, AddressOf MyResolveEventHandler

      InstantiateMyDynamicType(currentDomain)   'OK!
   End Sub 'Main

   Sub InstantiateMyDynamicType(domain As AppDomain)
      Try 
         ' You must supply a valid fully qualified assembly name here.
         domain.CreateInstance("Assembly text name, Version, Culture, PublicKeyToken", "MyDynamicType")
      Catch e As Exception
         Console.WriteLine(e.Message)
      End Try 
   End Sub 'InstantiateMyDynamicType

   Function MyResolveEventHandler(sender As Object, args As ResolveEventArgs) As System.Reflection.Assembly
      Return DefineDynamicAssembly(DirectCast(sender, AppDomain))
   End Function 'MyResolveEventHandler

   Function DefineDynamicAssembly(domain As AppDomain) As System.Reflection.Assembly
      ' Build a dynamic assembly using Reflection Emit API. 

      Dim assemblyName As New AssemblyName()
      assemblyName.Name = "MyDynamicAssembly" 

      Dim assemblyBuilder As AssemblyBuilder = domain.DefineDynamicAssembly(assemblyName, AssemblyBuilderAccess.Run)
      Dim moduleBuilder As ModuleBuilder = assemblyBuilder.DefineDynamicModule("MyDynamicModule")
      Dim typeBuilder As TypeBuilder = moduleBuilder.DefineType("MyDynamicType", TypeAttributes.Public)
      Dim constructorBuilder As ConstructorBuilder = typeBuilder.DefineConstructor(MethodAttributes.Public, CallingConventions.Standard, Nothing)
      Dim ilGenerator As ILGenerator = constructorBuilder.GetILGenerator()

      ilGenerator.EmitWriteLine("MyDynamicType instantiated!")
      ilGenerator.Emit(OpCodes.Ret)

      typeBuilder.CreateType()

      Return assemblyBuilder
   End Function 'DefineDynamicAssembly

End Module 'Test 

Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98

The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

.NET Framework

Supported in: 3.5, 3.0, 2.0, 1.1, 1.0

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