AppDomain.DynamicDirectory Propriedade

Referência

Definição

Namespace:: System

Assembly:: System.Runtime.dll

Assembly:: System.Runtime.Extensions.dll

Assembly:: mscorlib.dll

Assembly:: netstandard.dll

Importante

Algumas informações se referem a produtos de pré-lançamento que podem ser substancialmente modificados antes do lançamento. A Microsoft não oferece garantias, expressas ou implícitas, das informações aqui fornecidas.

Obtém o diretório que usa o resolvedor de assembly para sondar assemblies criados dinamicamente.

public:
 property System::String ^ DynamicDirectory { System::String ^ get(); };

public string? DynamicDirectory { get; }

public string DynamicDirectory { get; }

member this.DynamicDirectory : string

Public ReadOnly Property DynamicDirectory As String

Valor da propriedade

String

O diretório que usa o resolvedor de assembly para sondar assemblies criados dinamicamente.

Implementações

DynamicDirectory

Exceções

AppDomainUnloadedException

A operação é tentada em um domínio de aplicativo descarregado.

Exemplos

O exemplo a seguir cria um domínio de aplicativo com um diretório para assemblies dinâmicos, emite um assembly dinâmico e o armazena no diretório dinâmico e carrega o assembly no novo domínio do aplicativo e o usa.

O exemplo cria um AppDomainSetup objeto e define sua ApplicationName propriedade como "Exemplo" e sua DynamicBase propriedade como "C:\DynamicAssemblyDir". Em seguida, o exemplo exibe a DynamicBase propriedade para mostrar que o código hash do nome do aplicativo foi acrescentado como um subdiretório do caminho que foi originalmente atribuído.

Observação

O diretório base neste exemplo destina-se a estar fora do caminho de investigação do aplicativo de exemplo. Certifique-se de compilar o exemplo em um local diferente. Exclua o diretório base e todos os seus subdiretórios sempre que você executar o exemplo.

O exemplo cria um novo domínio de aplicativo, usando o AppDomainSetup objeto. O exemplo usa a DynamicDirectory propriedade para recuperar o nome do diretório, para que ele possa criar o diretório. (O exemplo poderia facilmente criar o diretório de antemão concatenando o caminho original, o código hash do nome do aplicativo e o nome do aplicativo.)

O exemplo tem um GenerateDynamicAssembly método que emite um assembly nomeado DynamicHelloWorld.dll e o armazena no diretório dinâmico do novo domínio do aplicativo. O assembly dinâmico contém um tipo, HelloWorldque tem um método estático (Shared método em Visual Basic) chamado HelloFromAD. Chamar esse método exibe o nome do domínio do aplicativo.

A Example classe deriva de MarshalByRefObject, portanto, o exemplo pode criar uma instância da classe no novo domínio do aplicativo e chamar seu Test método. O Test método carrega o assembly dinâmico pelo nome de exibição e chama o método estático HelloFromAD .

Você pode mostrar que o diretório dinâmico é pesquisado após os caminhos normais de investigação escrevendo código para um assembly nomeado DynamicHelloWorld.dll e compilando-o no mesmo diretório que este exemplo. O assembly deve ter uma classe nomeada HelloWorld com um método estático chamado HelloFromAD. Esse método não precisa ter a mesma funcionalidade que a do exemplo; ele pode simplesmente exibir uma cadeia de caracteres no console. O assembly também deve ter um AssemblyVersionAttribute atributo que define sua versão como 1.0.0.0. Quando você executa o exemplo, o assembly compilado no diretório atual é encontrado antes da pesquisa do diretório dinâmico.

using namespace System;
using namespace System::Reflection;
using namespace System::Reflection::Emit;

public ref class Example : MarshalByRefObject
{
public:
   void Test()
   {
      Assembly^ dynAssem = Assembly::Load(
         "DynamicHelloWorld, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null");

      Type^ myType = dynAssem->GetType("HelloWorld");
      myType->InvokeMember("HelloFromAD", BindingFlags::Public | 
         BindingFlags::Static | BindingFlags::InvokeMethod, 
         Type::DefaultBinder, nullptr, nullptr);
   }
};


static void GenerateDynamicAssembly(String^ location)
{
   // Define the dynamic assembly and the module. There is only one
   // module in this assembly. Note that the call to DefineDynamicAssembly 
   // specifies the location where the assembly will be saved. The 
   // assembly version is 1.0.0.0.
   //
   AssemblyName^ asmName = gcnew AssemblyName("DynamicHelloWorld");
   asmName->Version = gcnew Version("1.0.0.0");

   AssemblyBuilder^ ab = 
      AppDomain::CurrentDomain->DefineDynamicAssembly( 
         asmName, AssemblyBuilderAccess::Save, location);

   String^ moduleName = asmName->Name + ".exe";
   ModuleBuilder^ mb = ab->DefineDynamicModule(asmName->Name, moduleName);
   
   // Define the "HelloWorld" type, with one static method.
   TypeBuilder^ tb = mb->DefineType("HelloWorld", TypeAttributes::Public);
   MethodBuilder^ hello = tb->DefineMethod("HelloFromAD", 
      MethodAttributes::Public | MethodAttributes::Static, nullptr, nullptr);

   // The method displays a message that contains the name of the application
   // domain where the method is executed.
   ILGenerator^ il = hello->GetILGenerator();
   il->Emit(OpCodes::Ldstr, "Hello from '{0}'!");
   il->Emit(OpCodes::Call, AppDomain::typeid->GetProperty("CurrentDomain")->GetGetMethod());
   il->Emit(OpCodes::Call, AppDomain::typeid->GetProperty("FriendlyName")->GetGetMethod());
   il->Emit(OpCodes::Call, Console::typeid->GetMethod("WriteLine", 
                            gcnew array<Type^> { String::typeid, String::typeid }));
   il->Emit(OpCodes::Ret);

   // Complete the HelloWorld type and save the assembly. The assembly
   // is placed in the location specified by DefineDynamicAssembly.
   Type^ myType = tb->CreateType();
   ab->Save(moduleName);
};

void main()
{
   // Prepare to create a new application domain.
   AppDomainSetup^ setup = gcnew AppDomainSetup();

   // Set the application name before setting the dynamic base.
   setup->ApplicationName = "Example";
   
   // Set the location of the base directory where assembly resolution 
   // probes for dynamic assemblies. Note that the hash code of the 
   // application name is concatenated to the base directory name you 
   // supply. 
   setup->DynamicBase = "C:\\DynamicAssemblyDir";
   Console::WriteLine("DynamicBase is set to '{0}'.", setup->DynamicBase);

   AppDomain^ ad = AppDomain::CreateDomain("MyDomain", nullptr, setup);
   
   // The dynamic directory name is the dynamic base concatenated with
   // the application name: <DynamicBase>\<hash code>\<ApplicationName>
   String^ dynamicDir = ad->DynamicDirectory;
   Console::WriteLine("Dynamic directory is '{0}'.", dynamicDir);

   // The AssemblyBuilder won't create this directory automatically.
   if (!System::IO::Directory::Exists(dynamicDir))
   {
      Console::WriteLine("Creating the dynamic directory.");
      System::IO::Directory::CreateDirectory(dynamicDir);
   }

   // Generate a dynamic assembly and store it in the dynamic 
   // directory.
   GenerateDynamicAssembly(dynamicDir);

   // Create an instance of the Example class in the application domain,
   // and call its Test method to load the dynamic assembly and use it.
   Example^ ex = (Example^) ad->CreateInstanceAndUnwrap( 
         Example::typeid->Assembly->FullName, "Example");
   ex->Test();
}

/* This example produces output similar to the following:

DynamicBase is set to 'C:\DynamicAssemblyDir\5e4a7545'.
Dynamic directory is 'C:\DynamicAssemblyDir\5e4a7545\Example'.
Creating the dynamic directory.
Hello from 'MyDomain'!
 */

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

public class Example : MarshalByRefObject
{
   static void Main()
   {
      // Prepare to create a new application domain.
      AppDomainSetup setup = new AppDomainSetup();

      // Set the application name before setting the dynamic base.
      setup.ApplicationName = "Example";

      // Set the location of the base directory where assembly resolution
      // probes for dynamic assemblies. Note that the hash code of the
      // application name is concatenated to the base directory name you
      // supply.
      setup.DynamicBase = "C:\\DynamicAssemblyDir";
      Console.WriteLine("DynamicBase is set to '{0}'.", setup.DynamicBase);

      AppDomain ad = AppDomain.CreateDomain("MyDomain", null, setup);

      // The dynamic directory name is the dynamic base concatenated with
      // the application name: <DynamicBase>\<hash code>\<ApplicationName>
      string dynamicDir = ad.DynamicDirectory;
      Console.WriteLine("Dynamic directory is '{0}'.", dynamicDir);

      // The AssemblyBuilder won't create this directory automatically.
      if (!System.IO.Directory.Exists(dynamicDir))
      {
         Console.WriteLine("Creating the dynamic directory.");
         System.IO.Directory.CreateDirectory(dynamicDir);
      }

      // Generate a dynamic assembly and store it in the dynamic
      // directory.
      GenerateDynamicAssembly(dynamicDir);

      // Create an instance of the Example class in the application domain,
      // and call its Test method to load the dynamic assembly and use it.
      Example ex = (Example) ad.CreateInstanceAndUnwrap(
         typeof(Example).Assembly.FullName, "Example");
      ex.Test();
   }

   public void Test()
   {
      Assembly dynAssem = Assembly.Load(
         "DynamicHelloWorld, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null");

      Type myType = dynAssem.GetType("HelloWorld");
      myType.InvokeMember("HelloFromAD", BindingFlags.Public |
         BindingFlags.Static | BindingFlags.InvokeMethod,
         Type.DefaultBinder, null, null);
   }

   private static void GenerateDynamicAssembly(string location)
   {
      // Define the dynamic assembly and the module. There is only one
      // module in this assembly. Note that the call to DefineDynamicAssembly
      // specifies the location where the assembly will be saved. The
      // assembly version is 1.0.0.0.
      //
      AssemblyName asmName = new AssemblyName("DynamicHelloWorld");
      asmName.Version = new Version("1.0.0.0");

      AssemblyBuilder ab =
         AppDomain.CurrentDomain.DefineDynamicAssembly(
            asmName, AssemblyBuilderAccess.Save, location);

      String moduleName = asmName.Name + ".exe";
      ModuleBuilder mb = ab.DefineDynamicModule(asmName.Name, moduleName);

      // Define the "HelloWorld" type, with one static method.
      TypeBuilder tb = mb.DefineType("HelloWorld", TypeAttributes.Public);
      MethodBuilder hello = tb.DefineMethod("HelloFromAD",
         MethodAttributes.Public | MethodAttributes.Static, null, null);

      // The method displays a message that contains the name of the application
      // domain where the method is executed.
      ILGenerator il = hello.GetILGenerator();
      il.Emit(OpCodes.Ldstr, "Hello from '{0}'!");
      il.Emit(OpCodes.Call, typeof(AppDomain).GetProperty("CurrentDomain").GetGetMethod());
      il.Emit(OpCodes.Call, typeof(AppDomain).GetProperty("FriendlyName").GetGetMethod());
      il.Emit(OpCodes.Call, typeof(Console).GetMethod("WriteLine",
                             new Type[] { typeof(String), typeof(String) }));
      il.Emit(OpCodes.Ret);

      // Complete the HelloWorld type and save the assembly. The assembly
      // is placed in the location specified by DefineDynamicAssembly.
      Type myType = tb.CreateType();
      ab.Save(moduleName);
   }
}

/* This example produces output similar to the following:

DynamicBase is set to 'C:\DynamicAssemblyDir\5e4a7545'.
Dynamic directory is 'C:\DynamicAssemblyDir\5e4a7545\Example'.
Creating the dynamic directory.
Hello from 'MyDomain'!
 */

open System
open System.Reflection
open System.Reflection.Emit

type Example() =
    inherit MarshalByRefObject()
    member _.Test() =
        let dynAssem = 
            Assembly.Load "DynamicHelloWorld, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null"

        let myType = dynAssem.GetType "HelloWorld"
        myType.InvokeMember("HelloFromAD", BindingFlags.Public |||
            BindingFlags.Static ||| BindingFlags.InvokeMethod,
            Type.DefaultBinder, null, null)
        |> ignore

    static member GenerateDynamicAssembly(location: string) =
        // Define the dynamic assembly and the module. There is only one
        // module in this assembly. Note that the call to DefineDynamicAssembly
        // specifies the location where the assembly will be saved. The
        // assembly version is 1.0.0.0.
        let asmName = AssemblyName "DynamicHelloWorld"
        asmName.Version <- Version "1.0.0.0"

        let ab = AppDomain.CurrentDomain.DefineDynamicAssembly(asmName, AssemblyBuilderAccess.Save, location)

        let moduleName = asmName.Name + ".exe"
        let mb = ab.DefineDynamicModule(asmName.Name, moduleName)

        // Define the "HelloWorld" type, with one static method.
        let tb = mb.DefineType("HelloWorld", TypeAttributes.Public)
        let hello = 
            tb.DefineMethod("HelloFromAD", MethodAttributes.Public ||| MethodAttributes.Static, null, null)

        // The method displays a message that contains the name of the application
        // domain where the method is executed.
        let il = hello.GetILGenerator()
        il.Emit(OpCodes.Ldstr, "Hello from '{0}'!")
        il.Emit(OpCodes.Call, typeof<AppDomain>.GetProperty("CurrentDomain").GetGetMethod())
        il.Emit(OpCodes.Call, typeof<AppDomain>.GetProperty("FriendlyName").GetGetMethod())
        il.Emit(OpCodes.Call, typeof<Console>.GetMethod("WriteLine", [| typeof<string>; typeof<String> |]))
        il.Emit OpCodes.Ret

        // Complete the HelloWorld type and save the assembly. The assembly
        // is placed in the location specified by DefineDynamicAssembly.
        let myType = tb.CreateType()
        ab.Save moduleName

// Prepare to create a new application domain.
let setup = AppDomainSetup()

// Set the application name before setting the dynamic base.
setup.ApplicationName <- "Example"

// Set the location of the base directory where assembly resolution
// probes for dynamic assemblies. Note that the hash code of the
// application name is concatenated to the base directory name you
// supply.
setup.DynamicBase <- "C:\\DynamicAssemblyDir"
printfn $"DynamicBase is set to '{setup.DynamicBase}'."

let ad = AppDomain.CreateDomain("MyDomain", null, setup)

// The dynamic directory name is the dynamic base concatenated with
// the application name: <DynamicBase>\<hash code>\<ApplicationName>
let dynamicDir = ad.DynamicDirectory
printfn $"Dynamic directory is '{dynamicDir}'."

// The AssemblyBuilder won't create this directory automatically.
if not (System.IO.Directory.Exists dynamicDir) then
    printfn "Creating the dynamic directory."
    System.IO.Directory.CreateDirectory dynamicDir
    |> ignore

// Generate a dynamic assembly and store it in the dynamic
// directory.
Example.GenerateDynamicAssembly dynamicDir

// Create an instance of the Example class in the application domain,
// and call its Test method to load the dynamic assembly and use it.
let ex = ad.CreateInstanceAndUnwrap(typeof<Example>.Assembly.FullName, "Example") :?> Example
ex.Test()

(* This example produces output similar to the following:

DynamicBase is set to 'C:\DynamicAssemblyDir\5e4a7545'.
Dynamic directory is 'C:\DynamicAssemblyDir\5e4a7545\Example'.
Creating the dynamic directory.
Hello from 'MyDomain'!
 *)

Imports System.Reflection
Imports System.Reflection.Emit

Public Class Example 
   Inherits MarshalByRefObject
   
   Shared Sub Main(args() As String)

      ' Prepare to create a new application domain.
      Dim setup As New AppDomainSetup()

      ' Set the application name before setting the dynamic base.
      setup.ApplicationName = "Example"
      
      ' Set the location of the base directory where assembly resolution 
      ' probes for dynamic assemblies. Note that the hash code of the 
      ' application name is concatenated to the base directory name you 
      ' supply. 
      setup.DynamicBase = "C:\DynamicAssemblyDir"
      Console.WriteLine("DynamicBase is set to '{0}'.", setup.DynamicBase)

      Dim ad As AppDomain = AppDomain.CreateDomain("MyDomain", Nothing, setup)
      
      ' The dynamic directory name is the dynamic base concatenated with
      ' the application name: <DynamicBase>\<hash code>\<ApplicationName>
      Dim dynamicDir As String = ad.DynamicDirectory 
      Console.WriteLine("Dynamic directory is '{0}'.", dynamicDir)

      ' The AssemblyBuilder won't create this directory automatically.
      If Not System.IO.Directory.Exists(dynamicDir) Then 
         Console.WriteLine("Creating the dynamic directory.")
         System.IO.Directory.CreateDirectory(dynamicDir)
      End If

      ' Generate a dynamic assembly and store it in the dynamic 
      ' directory.
      GenerateDynamicAssembly(dynamicDir) 

      ' Create an instance of the Example class in the application domain,
      ' and call its Test method to load the dynamic assembly and use it.  
      Dim ex As Example = CType( _
         ad.CreateInstanceAndUnwrap( _
            GetType(Example).Assembly.FullName, "Example"), Example)
      ex.Test()
   End Sub

   Public Sub Test() 

      Dim dynAssem As [Assembly] = Assembly.Load(
         "DynamicHelloWorld, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null")

      Dim myType As Type = dynAssem.GetType("HelloWorld")
      myType.InvokeMember("HelloFromAD", BindingFlags.Public Or _
         BindingFlags.Static Or BindingFlags.InvokeMethod, _
         Type.DefaultBinder, Nothing, Nothing) 'New Object() {})
   End Sub


   Private Shared Sub GenerateDynamicAssembly(ByVal location As String)
      
      ' Define the dynamic assembly and the module. There is only one
      ' module in this assembly. Note that the call to DefineDynamicAssembly 
      ' specifies the location where the assembly will be saved. The 
      ' assembly version is 1.0.0.0.
      '
      Dim asmName As New AssemblyName("DynamicHelloWorld")
      asmName.Version = New Version("1.0.0.0")

      Dim ab As AssemblyBuilder = _
         AppDomain.CurrentDomain.DefineDynamicAssembly( _
            asmName, AssemblyBuilderAccess.Save, location)

      Dim moduleName As String = asmName.Name & ".dll"
      Dim mb As ModuleBuilder = ab.DefineDynamicModule(asmName.Name, moduleName)
      
      ' Define the "HelloWorld" type, with one static method.
      Dim tb As TypeBuilder = mb.DefineType("HelloWorld", TypeAttributes.Public)
      Dim hello As MethodBuilder = tb.DefineMethod("HelloFromAD", _
         MethodAttributes.Public Or MethodAttributes.Static, Nothing, Nothing)

      ' The method displays a message that contains the name of the application
      ' domain where the method is executed.
      Dim il As ILGenerator = hello.GetILGenerator()
      il.Emit(OpCodes.Ldstr, "Hello from '{0}'!")
      il.Emit(OpCodes.Call, GetType(AppDomain).GetProperty("CurrentDomain").GetGetMethod())
      il.Emit(OpCodes.Call, GetType(AppDomain).GetProperty("FriendlyName").GetGetMethod())
      il.Emit(OpCodes.Call, GetType(Console).GetMethod("WriteLine", _
                             New Type() { GetType(String), GetType(String) }))
      il.Emit(OpCodes.Ret)

      ' Complete the HelloWorld type and save the assembly. The assembly
      ' is placed in the location specified by DefineDynamicAssembly.
      Dim myType As Type = tb.CreateType()
      ab.Save(moduleName)
   End Sub
End Class 

' This example produces output similar to the following:
'
'DynamicBase is set to 'C:\DynamicAssemblyDir\5e4a7545'.
'Dynamic directory is 'C:\DynamicAssemblyDir\5e4a7545\Example'.
'Creating the dynamic directory.
'Hello from 'MyDomain'!

Comentários

Para definir o diretório dinâmico, atribua um caminho de diretório base à AppDomainSetup.DynamicBase propriedade do AppDomainSetup objeto que será usado para criar o novo domínio do aplicativo. O caminho do diretório base que você atribui à propriedade é modificado pela adição de um subdiretório cujo nome simples é o código hash da cadeia de caracteres que você atribui à AppDomainSetup.ApplicationName propriedade, portanto, o formato do diretório base é o código hash de caminho\ original. O diretório dinâmico é um subdiretório desse diretório base. Seu nome simples é o valor da AppDomainSetup.ApplicationName propriedade, portanto, seu formato é o nome do aplicativo de código\ hash de caminho\ original.

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