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Showing content from https://docs.microsoft.com/en-us/dotnet/api/system.appdomain.createinstanceandunwrap below:

AppDomain.CreateInstanceAndUnwrap Method (System) | Microsoft Learn

Source:: AppDomain.cs

Source:: AppDomain.cs

Source:: AppDomain.cs

Source:: AppDomain.cs

Creates a new instance of the specified type. Parameters specify the assembly where the type is defined, the name of the type, and an array of activation attributes.

public:
 System::Object ^ CreateInstanceAndUnwrap(System::String ^ assemblyName, System::String ^ typeName, cli::array <System::Object ^> ^ activationAttributes);

public object? CreateInstanceAndUnwrap(string assemblyName, string typeName, object?[]? activationAttributes);

public object CreateInstanceAndUnwrap(string assemblyName, string typeName, object[] activationAttributes);

member this.CreateInstanceAndUnwrap : string * string * obj[] -> obj

Public Function CreateInstanceAndUnwrap (assemblyName As String, typeName As String, activationAttributes As Object()) As Object

Parameters

typeName: String

The fully qualified name of the requested type, including the namespace but not the assembly, as returned by the FullName property.

activationAttributes: Object[]

An array of one or more attributes that can participate in activation. Typically, an array that contains a single UrlAttribute object that specifies the URL that is required to activate a remote object.

This parameter is related to client-activated objects.Client activation is a legacy technology that is retained for backward compatibility but is not recommended for new development. Distributed applications should instead use Windows Communication Foundation.

Returns

An instance of the object specified by typeName.

Exceptions

assemblyName or typeName is null.

No matching public constructor was found.

typeName was not found in assemblyName.

assemblyName was not found.

The caller does not have permission to call this constructor.

The caller cannot provide activation attributes for an object that does not inherit from MarshalByRefObject.

The operation is attempted on an unloaded application domain.

assemblyName is not a valid assembly for the currently loaded runtime.

An assembly or module was loaded twice with two different evidences.

Examples

using namespace System;
using namespace System::IO;
using namespace System::Threading;
using namespace System::Reflection;
using namespace System::Reflection::Emit;
using namespace System::Runtime::Remoting;

ref class ADDyno
{
public:
   static Type^ CreateADynamicAssembly( interior_ptr<AppDomain^> myNewDomain, String^ executableNameNoExe )
   {
      String^ executableName = String::Concat( executableNameNoExe, ".exe" );
      AssemblyName^ myAsmName = gcnew AssemblyName;
      myAsmName->Name = executableNameNoExe;
      myAsmName->CodeBase = Environment::CurrentDirectory;
      AssemblyBuilder^ myAsmBuilder = ( *myNewDomain)->DefineDynamicAssembly( myAsmName, AssemblyBuilderAccess::RunAndSave );
      Console::WriteLine( "-- Dynamic Assembly instantiated." );
      ModuleBuilder^ myModBuilder = myAsmBuilder->DefineDynamicModule( executableNameNoExe, executableName );
      TypeBuilder^ myTypeBuilder = myModBuilder->DefineType( executableNameNoExe, TypeAttributes::Public, MarshalByRefObject::typeid );
      array<Type^>^temp0 = nullptr;
      MethodBuilder^ myFCMethod = myTypeBuilder->DefineMethod( "CountLocalFiles", static_cast<MethodAttributes>(MethodAttributes::Public | MethodAttributes::Static), nullptr, temp0 );
      MethodInfo^ currentDirGetMI = Environment::typeid->GetProperty( "CurrentDirectory" )->GetGetMethod();
      array<Type^>^temp1 = {String::typeid};
      MethodInfo^ writeLine0objMI = Console::typeid->GetMethod( "WriteLine", temp1 );
      array<Type^>^temp2 = {String::typeid,Object::typeid,Object::typeid};
      MethodInfo^ writeLine2objMI = Console::typeid->GetMethod( "WriteLine", temp2 );
      array<Type^>^temp3 = {String::typeid};
      MethodInfo^ getFilesMI = Directory::typeid->GetMethod( "GetFiles", temp3 );
      myFCMethod->InitLocals = true;
      ILGenerator^ myFCIL = myFCMethod->GetILGenerator();
      Console::WriteLine( "-- Generating MSIL method body..." );
      LocalBuilder^ v0 = myFCIL->DeclareLocal( String::typeid );
      LocalBuilder^ v1 = myFCIL->DeclareLocal( int::typeid );
      LocalBuilder^ v2 = myFCIL->DeclareLocal( String::typeid );
      LocalBuilder^ v3 = myFCIL->DeclareLocal( array<String^>::typeid );
      Label evalForEachLabel = myFCIL->DefineLabel();
      Label topOfForEachLabel = myFCIL->DefineLabel();

      // Build the method body.
      myFCIL->EmitCall( OpCodes::Call, currentDirGetMI, nullptr );
      myFCIL->Emit( OpCodes::Stloc_S, v0 );
      myFCIL->Emit( OpCodes::Ldc_I4_0 );
      myFCIL->Emit( OpCodes::Stloc_S, v1 );
      myFCIL->Emit( OpCodes::Ldstr, "---" );
      myFCIL->EmitCall( OpCodes::Call, writeLine0objMI, nullptr );
      myFCIL->Emit( OpCodes::Ldloc_S, v0 );
      myFCIL->EmitCall( OpCodes::Call, getFilesMI, nullptr );
      myFCIL->Emit( OpCodes::Stloc_S, v3 );
      myFCIL->Emit( OpCodes::Br_S, evalForEachLabel );

      // foreach loop starts here.
      myFCIL->MarkLabel( topOfForEachLabel );

      // Load array of strings and index, store value at index for output.
      myFCIL->Emit( OpCodes::Ldloc_S, v3 );
      myFCIL->Emit( OpCodes::Ldloc_S, v1 );
      myFCIL->Emit( OpCodes::Ldelem_Ref );
      myFCIL->Emit( OpCodes::Stloc_S, v2 );
      myFCIL->Emit( OpCodes::Ldloc_S, v2 );
      myFCIL->EmitCall( OpCodes::Call, writeLine0objMI, nullptr );

      // Increment counter by one.
      myFCIL->Emit( OpCodes::Ldloc_S, v1 );
      myFCIL->Emit( OpCodes::Ldc_I4_1 );
      myFCIL->Emit( OpCodes::Add );
      myFCIL->Emit( OpCodes::Stloc_S, v1 );

      // Determine if end of file list array has been reached.
      myFCIL->MarkLabel( evalForEachLabel );
      myFCIL->Emit( OpCodes::Ldloc_S, v1 );
      myFCIL->Emit( OpCodes::Ldloc_S, v3 );
      myFCIL->Emit( OpCodes::Ldlen );
      myFCIL->Emit( OpCodes::Conv_I4 );
      myFCIL->Emit( OpCodes::Blt_S, topOfForEachLabel );

      //foreach loop end here.
      myFCIL->Emit( OpCodes::Ldstr, "---" );
      myFCIL->EmitCall( OpCodes::Call, writeLine0objMI, nullptr );
      myFCIL->Emit( OpCodes::Ldstr, "There are {0} files in {1}." );
      myFCIL->Emit( OpCodes::Ldloc_S, v1 );
      myFCIL->Emit( OpCodes::Box, int::typeid );
      myFCIL->Emit( OpCodes::Ldloc_S, v0 );
      myFCIL->EmitCall( OpCodes::Call, writeLine2objMI, nullptr );
      myFCIL->Emit( OpCodes::Ret );
      Type^ myType = myTypeBuilder->CreateType();
      myAsmBuilder->SetEntryPoint( myFCMethod );
      myAsmBuilder->Save( executableName );
      Console::WriteLine( "-- Method generated, type completed, and assembly saved to disk." );
      return myType;
   }
};

int main()
{
   String^ domainDir;
   String^ executableName = nullptr;
   Console::Write( "Enter a name for the file counting assembly: " );
   String^ executableNameNoExe = Console::ReadLine();
   executableName = String::Concat( executableNameNoExe, ".exe" );
   Console::WriteLine( "---" );
   domainDir = Environment::CurrentDirectory;
   AppDomain^ curDomain = Thread::GetDomain();

   // Create a new AppDomain, with the current directory as the base.
   Console::WriteLine( "Current Directory: {0}", Environment::CurrentDirectory );
   AppDomainSetup^ mySetupInfo = gcnew AppDomainSetup;
   mySetupInfo->ApplicationBase = domainDir;
   mySetupInfo->ApplicationName = executableNameNoExe;
   mySetupInfo->LoaderOptimization = LoaderOptimization::SingleDomain;
   AppDomain^ myDomain = AppDomain::CreateDomain( executableNameNoExe, nullptr, mySetupInfo );
   Console::WriteLine( "Creating a new AppDomain '{0}'...", executableNameNoExe );
   Console::WriteLine( "-- Base Directory = '{0}'", myDomain->BaseDirectory );
   Console::WriteLine( "-- Shadow Copy? = '{0}'", myDomain->ShadowCopyFiles );
   Console::WriteLine( "---" );
   Type^ myFCType = ADDyno::CreateADynamicAssembly(  &curDomain, executableNameNoExe );
   Console::WriteLine( "Loading '{0}' from '{1}'...", executableName, myDomain->BaseDirectory );
   BindingFlags bFlags = static_cast<BindingFlags>(BindingFlags::Public | BindingFlags::CreateInstance | BindingFlags::Instance);
   Object^ myObjInstance = myDomain->CreateInstanceAndUnwrap( executableNameNoExe, executableNameNoExe, false, bFlags, nullptr, nullptr, nullptr, nullptr, nullptr );
   Console::WriteLine( "Executing method 'CountLocalFiles' in {0}...", myObjInstance );
   array<Object^>^temp4 = nullptr;
   myFCType->InvokeMember( "CountLocalFiles", BindingFlags::InvokeMethod, nullptr, myObjInstance, temp4 );
}

using System;
using System.IO;
using System.Threading;
using System.Reflection;
using System.Reflection.Emit;
using System.Runtime.Remoting;

class ADDyno
{
   public static Type CreateADynamicAssembly(ref AppDomain myNewDomain,
                         string executableNameNoExe)
   {
    string executableName = executableNameNoExe + ".exe";

    AssemblyName myAsmName = new AssemblyName();
    myAsmName.Name = executableNameNoExe;
    myAsmName.CodeBase = Environment.CurrentDirectory;

    AssemblyBuilder myAsmBuilder = myNewDomain.DefineDynamicAssembly(myAsmName,
                        AssemblyBuilderAccess.RunAndSave);
    Console.WriteLine("-- Dynamic Assembly instantiated.");

    ModuleBuilder myModBuilder = myAsmBuilder.DefineDynamicModule(executableNameNoExe,
                                      executableName);

    TypeBuilder myTypeBuilder = myModBuilder.DefineType(executableNameNoExe,
                        TypeAttributes.Public,
                        typeof(MarshalByRefObject));

    MethodBuilder myFCMethod = myTypeBuilder.DefineMethod("CountLocalFiles",
                        MethodAttributes.Public |
                        MethodAttributes.Static,
                        null,
                        new Type[] {  });

    MethodInfo currentDirGetMI = typeof(Environment).GetProperty("CurrentDirectory").GetGetMethod();
    MethodInfo writeLine0objMI = typeof(Console).GetMethod("WriteLine",
                     new Type[] { typeof(string) });
    MethodInfo writeLine2objMI = typeof(Console).GetMethod("WriteLine",
                     new Type[] { typeof(string), typeof(object), typeof(object) });
    MethodInfo getFilesMI = typeof(Directory).GetMethod("GetFiles",
                new Type[] { typeof(string) });

    myFCMethod.InitLocals = true;

    ILGenerator myFCIL = myFCMethod.GetILGenerator();

    Console.WriteLine("-- Generating MSIL method body...");
    LocalBuilder v0 = myFCIL.DeclareLocal(typeof(string));
    LocalBuilder v1 = myFCIL.DeclareLocal(typeof(int));
    LocalBuilder v2 = myFCIL.DeclareLocal(typeof(string));
    LocalBuilder v3 = myFCIL.DeclareLocal(typeof(string[]));

    Label evalForEachLabel = myFCIL.DefineLabel();
    Label topOfForEachLabel = myFCIL.DefineLabel();

    // Build the method body.

    myFCIL.EmitCall(OpCodes.Call, currentDirGetMI, null);
    myFCIL.Emit(OpCodes.Stloc_S, v0);
    myFCIL.Emit(OpCodes.Ldc_I4_0);
    myFCIL.Emit(OpCodes.Stloc_S, v1);
    myFCIL.Emit(OpCodes.Ldstr, "---");
    myFCIL.EmitCall(OpCodes.Call, writeLine0objMI, null);
    myFCIL.Emit(OpCodes.Ldloc_S, v0);
    myFCIL.EmitCall(OpCodes.Call, getFilesMI, null);
    myFCIL.Emit(OpCodes.Stloc_S, v3);

    myFCIL.Emit(OpCodes.Br_S, evalForEachLabel);

    // foreach loop starts here.
    myFCIL.MarkLabel(topOfForEachLabel);
    
        // Load array of strings and index, store value at index for output.
    myFCIL.Emit(OpCodes.Ldloc_S, v3);
    myFCIL.Emit(OpCodes.Ldloc_S, v1);
    myFCIL.Emit(OpCodes.Ldelem_Ref);
    myFCIL.Emit(OpCodes.Stloc_S, v2);

    myFCIL.Emit(OpCodes.Ldloc_S, v2);
    myFCIL.EmitCall(OpCodes.Call, writeLine0objMI, null);

    // Increment counter by one.
    myFCIL.Emit(OpCodes.Ldloc_S, v1);
    myFCIL.Emit(OpCodes.Ldc_I4_1);
    myFCIL.Emit(OpCodes.Add);
    myFCIL.Emit(OpCodes.Stloc_S, v1);

    // Determine if end of file list array has been reached.
    myFCIL.MarkLabel(evalForEachLabel);
    myFCIL.Emit(OpCodes.Ldloc_S, v1);
    myFCIL.Emit(OpCodes.Ldloc_S, v3);
    myFCIL.Emit(OpCodes.Ldlen);
    myFCIL.Emit(OpCodes.Conv_I4);
    myFCIL.Emit(OpCodes.Blt_S, topOfForEachLabel);
    //foreach loop end here.

    myFCIL.Emit(OpCodes.Ldstr, "---");
    myFCIL.EmitCall(OpCodes.Call, writeLine0objMI, null);
    myFCIL.Emit(OpCodes.Ldstr, "There are {0} files in {1}.");
    myFCIL.Emit(OpCodes.Ldloc_S, v1);
    myFCIL.Emit(OpCodes.Box, typeof(int));
    myFCIL.Emit(OpCodes.Ldloc_S, v0);
    myFCIL.EmitCall(OpCodes.Call, writeLine2objMI, null);

    myFCIL.Emit(OpCodes.Ret);

    Type myType = myTypeBuilder.CreateType();

    myAsmBuilder.SetEntryPoint(myFCMethod);
    myAsmBuilder.Save(executableName);		
    Console.WriteLine("-- Method generated, type completed, and assembly saved to disk.");

    return myType;
   }

   public static void Main()
   {

    string domainDir, executableName = null;
    
    Console.Write("Enter a name for the file counting assembly: ");
    string executableNameNoExe = Console.ReadLine();
    executableName = executableNameNoExe + ".exe";
    Console.WriteLine("---");

    domainDir = Environment.CurrentDirectory;

    AppDomain curDomain = Thread.GetDomain();	

    // Create a new AppDomain, with the current directory as the base.

    Console.WriteLine("Current Directory: {0}", Environment.CurrentDirectory);
    AppDomainSetup mySetupInfo = new AppDomainSetup();
    mySetupInfo.ApplicationBase = domainDir;
    mySetupInfo.ApplicationName = executableNameNoExe;
    mySetupInfo.LoaderOptimization = LoaderOptimization.SingleDomain;

    AppDomain myDomain = AppDomain.CreateDomain(executableNameNoExe,
                    null, mySetupInfo);

    Console.WriteLine("Creating a new AppDomain '{0}'...",
                    executableNameNoExe);

    Console.WriteLine("-- Base Directory = '{0}'", myDomain.BaseDirectory);
    Console.WriteLine("-- Shadow Copy? = '{0}'", myDomain.ShadowCopyFiles);

    Console.WriteLine("---");
    Type myFCType = CreateADynamicAssembly(ref curDomain,
                     executableNameNoExe);

    Console.WriteLine("Loading '{0}' from '{1}'...", executableName,
              myDomain.BaseDirectory.ToString());

    BindingFlags bFlags = (BindingFlags.Public | BindingFlags.CreateInstance |
                   BindingFlags.Instance);

    Object myObjInstance = myDomain.CreateInstanceAndUnwrap(executableNameNoExe,
                executableNameNoExe, false, bFlags,
                null, null, null, null, null);

    Console.WriteLine("Executing method 'CountLocalFiles' in {0}...",
               myObjInstance.ToString());

    myFCType.InvokeMember("CountLocalFiles", BindingFlags.InvokeMethod, null,
                myObjInstance, new object[] { });
   }
}

open System
open System.IO
open System.Threading
open System.Reflection
open System.Reflection.Emit

let createADynamicAssembly (myNewDomain: byref<AppDomain>) executableNameNoExe =
    let executableName = executableNameNoExe + ".exe"

    let myAsmName = AssemblyName()
    myAsmName.Name <- executableNameNoExe
    myAsmName.CodeBase <- Environment.CurrentDirectory

    let myAsmBuilder = 
        myNewDomain.DefineDynamicAssembly(myAsmName, AssemblyBuilderAccess.RunAndSave)
    printfn "-- Dynamic Assembly instantiated."

    let myModBuilder = 
        myAsmBuilder.DefineDynamicModule(executableNameNoExe, executableName)

    let myTypeBuilder = 
        myModBuilder.DefineType(executableNameNoExe,
                        TypeAttributes.Public,
                        typeof<MarshalByRefObject>)

    let myFCMethod = 
        myTypeBuilder.DefineMethod("CountLocalFiles",
                        MethodAttributes.Public |||
                        MethodAttributes.Static,
                        null,
                        [||])

    let currentDirGetMI = typeof<Environment>.GetProperty("CurrentDirectory").GetGetMethod()
    let writeLine0objMI = typeof<Console>.GetMethod("WriteLine", [| typeof<string> |])
    let writeLine2objMI = typeof<Console>.GetMethod("WriteLine", [| typeof<string>; typeof<obj>; typeof<obj> |])
    let getFilesMI = typeof<Directory>.GetMethod("GetFiles", [| typeof<string> |])

    myFCMethod.InitLocals <- true

    let myFCIL = myFCMethod.GetILGenerator()

    printfn "-- Generating MSIL method body..."
    let v0 = myFCIL.DeclareLocal typeof<string>
    let v1 = myFCIL.DeclareLocal typeof<int>
    let v2 = myFCIL.DeclareLocal typeof<string>
    let v3 = myFCIL.DeclareLocal typeof<string[]>

    let evalForEachLabel = myFCIL.DefineLabel()
    let topOfForEachLabel = myFCIL.DefineLabel()

    // Build the method body.

    myFCIL.EmitCall(OpCodes.Call, currentDirGetMI, null)
    myFCIL.Emit(OpCodes.Stloc_S, v0)
    myFCIL.Emit(OpCodes.Ldc_I4_0)
    myFCIL.Emit(OpCodes.Stloc_S, v1)
    myFCIL.Emit(OpCodes.Ldstr, "---")
    myFCIL.EmitCall(OpCodes.Call, writeLine0objMI, null)
    myFCIL.Emit(OpCodes.Ldloc_S, v0)
    myFCIL.EmitCall(OpCodes.Call, getFilesMI, null)
    myFCIL.Emit(OpCodes.Stloc_S, v3)

    myFCIL.Emit(OpCodes.Br_S, evalForEachLabel)

    // foreach loop starts here.
    myFCIL.MarkLabel topOfForEachLabel
    
        // Load array of strings and index, store value at index for output.
    myFCIL.Emit(OpCodes.Ldloc_S, v3)
    myFCIL.Emit(OpCodes.Ldloc_S, v1)
    myFCIL.Emit OpCodes.Ldelem_Ref
    myFCIL.Emit(OpCodes.Stloc_S, v2)

    myFCIL.Emit(OpCodes.Ldloc_S, v2)
    myFCIL.EmitCall(OpCodes.Call, writeLine0objMI, null)

    // Increment counter by one.
    myFCIL.Emit(OpCodes.Ldloc_S, v1)
    myFCIL.Emit(OpCodes.Ldc_I4_1)
    myFCIL.Emit OpCodes.Add
    myFCIL.Emit(OpCodes.Stloc_S, v1)

    // Determine if end of file list array has been reached.
    myFCIL.MarkLabel evalForEachLabel
    myFCIL.Emit(OpCodes.Ldloc_S, v1)
    myFCIL.Emit(OpCodes.Ldloc_S, v3)
    myFCIL.Emit OpCodes.Ldlen
    myFCIL.Emit OpCodes.Conv_I4
    myFCIL.Emit(OpCodes.Blt_S, topOfForEachLabel)
    //foreach loop end here.

    myFCIL.Emit(OpCodes.Ldstr, "---")
    myFCIL.EmitCall(OpCodes.Call, writeLine0objMI, null)
    myFCIL.Emit(OpCodes.Ldstr, "There are {0} files in {1}.")
    myFCIL.Emit(OpCodes.Ldloc_S, v1)
    myFCIL.Emit(OpCodes.Box, typeof<int>)
    myFCIL.Emit(OpCodes.Ldloc_S, v0)
    myFCIL.EmitCall(OpCodes.Call, writeLine2objMI, null)

    myFCIL.Emit OpCodes.Ret

    let myType = myTypeBuilder.CreateType()

    myAsmBuilder.SetEntryPoint myFCMethod
    myAsmBuilder.Save executableName
    printfn "-- Method generated, type completed, and assembly saved to disk."

    myType


printf "Enter a name for the file counting assembly: "
let executableNameNoExe = stdin.ReadLine()
let executableName = executableNameNoExe + ".exe"
printfn "---"

let domainDir = Environment.CurrentDirectory

let mutable curDomain = Thread.GetDomain()

// Create a new AppDomain, with the current directory as the base.

printfn $"Current Directory: {Environment.CurrentDirectory}"
let mySetupInfo = AppDomainSetup()
mySetupInfo.ApplicationBase <- domainDir
mySetupInfo.ApplicationName <- executableNameNoExe
mySetupInfo.LoaderOptimization <- LoaderOptimization.SingleDomain

let myDomain = 
    AppDomain.CreateDomain(executableNameNoExe, null, mySetupInfo)

printfn $"Creating a new AppDomain '{executableNameNoExe}'..."

printfn $"-- Base Directory = '{myDomain.BaseDirectory}'"
printfn $"-- Shadow Copy? = '{myDomain.ShadowCopyFiles}'"

printfn "---"
let myFCType = 
    createADynamicAssembly &curDomain executableNameNoExe

printfn $"Loading '{executableName}' from '{myDomain.BaseDirectory}'..."

let bFlags = 
    BindingFlags.Public ||| BindingFlags.CreateInstance ||| BindingFlags.Instance

let myObjInstance = 
    myDomain.CreateInstanceAndUnwrap(executableNameNoExe,
            executableNameNoExe, false, bFlags,
            null, null, null, null, null)

printfn $"Executing method 'CountLocalFiles' in {myObjInstance}..."

myFCType.InvokeMember("CountLocalFiles", BindingFlags.InvokeMethod, null, myObjInstance, [||])

Imports System.IO
Imports System.Threading
Imports System.Reflection
Imports System.Reflection.Emit
Imports System.Runtime.Remoting



Class ADDyno
   
   
   
   Public Shared Function CreateADynamicAssembly(ByRef myNewDomain As AppDomain, executableNameNoExe As String) As Type
      
      Dim executableName As String = executableNameNoExe + ".exe"
      
      Dim myAsmName As New AssemblyName()
      myAsmName.Name = executableNameNoExe
      myAsmName.CodeBase = Environment.CurrentDirectory
      
      Dim myAsmBuilder As AssemblyBuilder = myNewDomain.DefineDynamicAssembly(myAsmName, AssemblyBuilderAccess.RunAndSave)
      Console.WriteLine("-- Dynamic Assembly instantiated.")
      
      Dim myModBuilder As ModuleBuilder = myAsmBuilder.DefineDynamicModule(executableNameNoExe, executableName)
      
      Dim myTypeBuilder As TypeBuilder = myModBuilder.DefineType(executableNameNoExe, TypeAttributes.Public, GetType(MarshalByRefObject))
      
      Dim myFCMethod As MethodBuilder = myTypeBuilder.DefineMethod("CountLocalFiles", MethodAttributes.Public Or MethodAttributes.Static, Nothing, New Type() {})
      
      Dim currentDirGetMI As MethodInfo = GetType(Environment).GetProperty("CurrentDirectory").GetGetMethod()
      Dim writeLine0objMI As MethodInfo = GetType(Console).GetMethod("WriteLine", New Type() {GetType(String)})
      Dim writeLine2objMI As MethodInfo = GetType(Console).GetMethod("WriteLine", New Type() {GetType(String), GetType(Object), GetType(Object)})
      Dim getFilesMI As MethodInfo = GetType(Directory).GetMethod("GetFiles", New Type() {GetType(String)})
      
      myFCMethod.InitLocals = True
      
      Dim myFCIL As ILGenerator = myFCMethod.GetILGenerator()
      
      Console.WriteLine("-- Generating MSIL method body...")
      Dim v0 As LocalBuilder = myFCIL.DeclareLocal(GetType(String))
      Dim v1 As LocalBuilder = myFCIL.DeclareLocal(GetType(Integer))
      Dim v2 As LocalBuilder = myFCIL.DeclareLocal(GetType(String))
      Dim v3 As LocalBuilder = myFCIL.DeclareLocal(GetType(String()))
      
      Dim evalForEachLabel As Label = myFCIL.DefineLabel()
      Dim topOfForEachLabel As Label = myFCIL.DefineLabel()
      
      ' Build the method body.
      myFCIL.EmitCall(OpCodes.Call, currentDirGetMI, Nothing)
      myFCIL.Emit(OpCodes.Stloc_S, v0)
      myFCIL.Emit(OpCodes.Ldc_I4_0)
      myFCIL.Emit(OpCodes.Stloc_S, v1)
      myFCIL.Emit(OpCodes.Ldstr, "---")
      myFCIL.EmitCall(OpCodes.Call, writeLine0objMI, Nothing)
      myFCIL.Emit(OpCodes.Ldloc_S, v0)
      myFCIL.EmitCall(OpCodes.Call, getFilesMI, Nothing)
      myFCIL.Emit(OpCodes.Stloc_S, v3)
      
      myFCIL.Emit(OpCodes.Br_S, evalForEachLabel)
      
      ' foreach loop starts here.
      myFCIL.MarkLabel(topOfForEachLabel)
      
      ' Load array of strings and index, store value at index for output.
      myFCIL.Emit(OpCodes.Ldloc_S, v3)
      myFCIL.Emit(OpCodes.Ldloc_S, v1)
      myFCIL.Emit(OpCodes.Ldelem_Ref)
      myFCIL.Emit(OpCodes.Stloc_S, v2)
      
      myFCIL.Emit(OpCodes.Ldloc_S, v2)
      myFCIL.EmitCall(OpCodes.Call, writeLine0objMI, Nothing)
      
      ' Increment counter by one.
      myFCIL.Emit(OpCodes.Ldloc_S, v1)
      myFCIL.Emit(OpCodes.Ldc_I4_1)
      myFCIL.Emit(OpCodes.Add)
      myFCIL.Emit(OpCodes.Stloc_S, v1)
      
      ' Determine if end of file list array has been reached.
      myFCIL.MarkLabel(evalForEachLabel)
      myFCIL.Emit(OpCodes.Ldloc_S, v1)
      myFCIL.Emit(OpCodes.Ldloc_S, v3)
      myFCIL.Emit(OpCodes.Ldlen)
      myFCIL.Emit(OpCodes.Conv_I4)
      myFCIL.Emit(OpCodes.Blt_S, topOfForEachLabel)
      'foreach loop end here.
      myFCIL.Emit(OpCodes.Ldstr, "---")
      myFCIL.EmitCall(OpCodes.Call, writeLine0objMI, Nothing)
      myFCIL.Emit(OpCodes.Ldstr, "There are {0} files in {1}.")
      myFCIL.Emit(OpCodes.Ldloc_S, v1)
      myFCIL.Emit(OpCodes.Box, GetType(Integer))
      myFCIL.Emit(OpCodes.Ldloc_S, v0)
      myFCIL.EmitCall(OpCodes.Call, writeLine2objMI, Nothing)
      
      myFCIL.Emit(OpCodes.Ret)
      
      Dim myType As Type = myTypeBuilder.CreateType()
      
      myAsmBuilder.SetEntryPoint(myFCMethod)
      myAsmBuilder.Save(executableName)
      Console.WriteLine("-- Method generated, type completed, and assembly saved to disk.")
      
      Return myType
   End Function 'CreateADynamicAssembly
    
   
   Public Shared Sub Main()
      
      Dim executableName As String = Nothing
      Dim domainDir As String
      
      Console.Write("Enter a name for the file counting assembly: ")
      Dim executableNameNoExe As String = Console.ReadLine()
      executableName = executableNameNoExe + ".exe"
      Console.WriteLine("---")
      
      domainDir = Environment.CurrentDirectory
      
      Dim curDomain As AppDomain = Thread.GetDomain()
      
      
      ' Create a new AppDomain, with the current directory as the base.
      Console.WriteLine("Current Directory: {0}", Environment.CurrentDirectory)
      Dim mySetupInfo As New AppDomainSetup()
      mySetupInfo.ApplicationBase = domainDir
      mySetupInfo.ApplicationName = executableNameNoExe
      mySetupInfo.LoaderOptimization = LoaderOptimization.SingleDomain
      
      Dim myDomain As AppDomain = AppDomain.CreateDomain(executableNameNoExe, Nothing, mySetupInfo)
      
      Console.WriteLine("Creating a new AppDomain '{0}'...", executableNameNoExe)
      
      Console.WriteLine("-- Base Directory = '{0}'", myDomain.BaseDirectory)
      Console.WriteLine("-- Shadow Copy? = '{0}'", myDomain.ShadowCopyFiles)
      
      Console.WriteLine("---")
      Dim myFCType As Type = CreateADynamicAssembly(curDomain, executableNameNoExe)
      
      Console.WriteLine("Loading '{0}' from '{1}'...", executableName, myDomain.BaseDirectory.ToString())
      
      
      Dim bFlags As BindingFlags = BindingFlags.Public Or BindingFlags.CreateInstance Or BindingFlags.Instance
      
      Dim myObjInstance As [Object] = myDomain.CreateInstanceAndUnwrap(executableNameNoExe, executableNameNoExe, False, bFlags, Nothing, Nothing, Nothing, Nothing, Nothing)
      
      Console.WriteLine("Executing method 'CountLocalFiles' in {0}...", myObjInstance.ToString())
      
      myFCType.InvokeMember("CountLocalFiles", BindingFlags.InvokeMethod, Nothing, myObjInstance, New Object() {})
   End Sub
End Class

Remarks

This is a convenience method that combines CreateInstance and ObjectHandle.Unwrap. This method calls the parameterless constructor for typeName.

See AssemblyName for the format of assemblyName. See the Type.FullName property for the format of typeName.

Note

If you make an early-bound call to a method M of an object of type T1 that was returned by CreateInstanceAndUnwrap, and that method makes an early-bound call to a method of an object of type T2 in an assembly C other than the current assembly or the assembly containing T1, assembly C is loaded into the current application domain. This loading occurs even if the early-bound call to T1.M() was made in the body of a DynamicMethod, or in other dynamically generated code. If the current domain is the default domain, assembly C cannot be unloaded until the process ends. If the current domain later attempts to load assembly C, the load might fail.