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AppDomain.DefineDynamicAssembly Method (AssemblyName, AssemblyBuilderAccess, String, Evidence)

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

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

public AssemblyBuilder DefineDynamicAssembly (
	AssemblyName name,
	AssemblyBuilderAccess access,
	string dir,
	Evidence evidence
)
public final AssemblyBuilder DefineDynamicAssembly (
	AssemblyName name, 
	AssemblyBuilderAccess access, 
	String dir, 
	Evidence evidence
)
public final function DefineDynamicAssembly (
	name : AssemblyName, 
	access : AssemblyBuilderAccess, 
	dir : String, 
	evidence : Evidence
) : AssemblyBuilder

Parameters

name

The unique identity of the dynamic assembly.

access

The mode in which the dynamic assembly will be accessed.

dir

The name of the directory where the assembly will be saved. If dir is a null reference (Nothing in Visual Basic), the directory defaults to the current directory.

evidence

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

Return Value

Represents the dynamic assembly created.

Exception typeCondition

ArgumentNullException

name is a null reference (Nothing in Visual Basic).

ArgumentException

The Name property of name is a null reference (Nothing in Visual Basic).

-or-

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

AppDomainUnloadedException

Operations are attempted on an unloaded application domain.

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 a null reference (Nothing in Visual Basic), 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 name parameter indirectly specifies a Version (as an OperatingSystem constructor parameter). However, this method only persists the major and minor version numbers, not the build and revision numbers. For example, if the LoadFrom method is used to indirectly recover the Version for this assembly, only that object's major and minor version numbers will be as originally specified.

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 System;
using System.Reflection;
using System.Reflection.Emit;

class Test {
   public static void Main() {
      AppDomain currentDomain = AppDomain.CurrentDomain;

      InstantiateMyDynamicType(currentDomain);   // Failed!
      
      currentDomain.AssemblyResolve += new ResolveEventHandler(MyResolveEventHandler);
      
      InstantiateMyDynamicType(currentDomain);   // OK!
   }

   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((AppDomain) sender);
   }
   
   static Assembly DefineDynamicAssembly(AppDomain domain) {
      // Build a dynamic assembly using Reflection Emit API.
   
      AssemblyName assemblyName = new 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, null);
      ILGenerator ilGenerator = constructorBuilder.GetILGenerator();
      
      ilGenerator.EmitWriteLine("MyDynamicType instantiated!");
      ilGenerator.Emit(OpCodes.Ret);

      typeBuilder.CreateType();

      return assemblyBuilder;
   }
}

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

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

.NET Framework

Supported in: 2.0, 1.1, 1.0
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