AppDomain.Load 方法

定义

命名空间:

System

程序集:

System.Runtime.dll

将 Assembly 加载到此应用程序域中。

重载

Load(Byte[])	加载带有基于通用对象文件格式 (COFF) 的图像的 Assembly，该图像包含已发出的 Assembly。
Load(AssemblyName)	在给定 AssemblyName 的情况下加载 Assembly。
Load(String)	在给定其显示名称的情况下加载 Assembly。
Load(Byte[], Byte[])	加载带有基于通用对象文件格式 (COFF) 的图像的 Assembly，该图像包含已发出的 Assembly。 还加载表示 Assembly 的符号的原始字节。

Load(Byte[])

Source:

AppDomain.cs

加载带有基于通用对象文件格式 (COFF) 的图像的 Assembly，该图像包含已发出的 Assembly。

public:
 System::Reflection::Assembly ^ Load(cli::array <System::Byte> ^ rawAssembly);

public System.Reflection.Assembly Load (byte[] rawAssembly);

member this.Load : byte[] -> System.Reflection.Assembly

Public Function Load (rawAssembly As Byte()) As Assembly

参数

rawAssembly

Byte[]

byte 类型的数组，它是包含已发出程序集的基于 COFF 的图像。

返回

Assembly

加载的程序集。

例外

ArgumentNullException

rawAssembly 为 null。

BadImageFormatException

rawAssembly 对于当前加载的运行时，不是有效的程序集。

AppDomainUnloadedException

在卸载的应用程序域上尝试该操作。

FileLoadException

一个程序集或模块用两个不同的证据加载了两次。

示例

以下示例演示如何使用加载原始程序集。

若要运行此代码示例，必须提供完全限定的程序集名称。 有关如何获取完全限定程序集名称的信息，请参阅 程序集名称。

using namespace System;
using namespace System::IO;
using namespace System::Reflection;
using namespace System::Reflection::Emit;
void InstantiateMyType( AppDomain^ domain )
{
   try
   {
      
      // You must supply a valid fully qualified assembly name here.
      domain->CreateInstance( "Assembly text name, Version, Culture, PublicKeyToken", "MyType" );
   }
   catch ( Exception^ e ) 
   {
      Console::WriteLine( e->Message );
   }

}


// Loads the content of a file to a Byte array.
array<Byte>^ loadFile( String^ filename )
{
   FileStream^ fs = gcnew FileStream( filename,FileMode::Open );
   array<Byte>^buffer = gcnew array<Byte>((int)fs->Length);
   fs->Read( buffer, 0, buffer->Length );
   fs->Close();
   return buffer;
}


// Creates a dynamic assembly with symbol information
// and saves them to temp.dll and temp.pdb
void EmitAssembly( AppDomain^ domain )
{
   AssemblyName^ assemblyName = gcnew AssemblyName;
   assemblyName->Name = "MyAssembly";
   AssemblyBuilder^ assemblyBuilder = domain->DefineDynamicAssembly( assemblyName, AssemblyBuilderAccess::Save );
   ModuleBuilder^ moduleBuilder = assemblyBuilder->DefineDynamicModule( "MyModule", "temp.dll", true );
   TypeBuilder^ typeBuilder = moduleBuilder->DefineType( "MyType", TypeAttributes::Public );
   ConstructorBuilder^ constructorBuilder = typeBuilder->DefineConstructor( MethodAttributes::Public, CallingConventions::Standard, nullptr );
   ILGenerator^ ilGenerator = constructorBuilder->GetILGenerator();
   ilGenerator->EmitWriteLine( "MyType instantiated!" );
   ilGenerator->Emit( OpCodes::Ret );
   typeBuilder->CreateType();
   assemblyBuilder->Save( "temp.dll" );
}

ref class Resolver
{
public:
   static Assembly^ MyResolver( Object^ sender, ResolveEventArgs^ args )
   {
      AppDomain^ domain = dynamic_cast<AppDomain^>(sender);
      
      // Once the files are generated, this call is
      // actually no longer necessary.
      EmitAssembly( domain );
      array<Byte>^rawAssembly = loadFile( "temp.dll" );
      array<Byte>^rawSymbolStore = loadFile( "temp.pdb" );
      Assembly^ assembly = domain->Load( rawAssembly, rawSymbolStore );
      return assembly;
   }

};

int main()
{
   AppDomain^ currentDomain = AppDomain::CurrentDomain;
   InstantiateMyType( currentDomain ); // Failed!
   currentDomain->AssemblyResolve += gcnew ResolveEventHandler( Resolver::MyResolver );
   InstantiateMyType( currentDomain ); // OK!
}

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

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

      InstantiateMyType(currentDomain);   // Failed!

      currentDomain.AssemblyResolve += new ResolveEventHandler(MyResolver);

      InstantiateMyType(currentDomain);   // OK!
   }

   static void InstantiateMyType(AppDomain domain) {
      try {
     // You must supply a valid fully qualified assembly name here.
         domain.CreateInstance("Assembly text name, Version, Culture, PublicKeyToken", "MyType");
      } catch (Exception e) {
         Console.WriteLine(e.Message);
      }
   }

   // Loads the content of a file to a byte array.
   static byte[] loadFile(string filename) {
      FileStream fs = new FileStream(filename, FileMode.Open);
      byte[] buffer = new byte[(int) fs.Length];
      fs.Read(buffer, 0, buffer.Length);
      fs.Close();

      return buffer;
   }

   static Assembly MyResolver(object sender, ResolveEventArgs args) {
      AppDomain domain = (AppDomain) sender;

      // Once the files are generated, this call is
      // actually no longer necessary.
      EmitAssembly(domain);

      byte[] rawAssembly = loadFile("temp.dll");
      byte[] rawSymbolStore = loadFile("temp.pdb");
      Assembly assembly = domain.Load(rawAssembly, rawSymbolStore);

      return assembly;
   }

   // Creates a dynamic assembly with symbol information
   // and saves them to temp.dll and temp.pdb
   static void EmitAssembly(AppDomain domain) {
      AssemblyName assemblyName = new AssemblyName();
      assemblyName.Name = "MyAssembly";

      AssemblyBuilder assemblyBuilder = domain.DefineDynamicAssembly(assemblyName, AssemblyBuilderAccess.Save);
      ModuleBuilder moduleBuilder = assemblyBuilder.DefineDynamicModule("MyModule", "temp.dll", true);
      TypeBuilder typeBuilder = moduleBuilder.DefineType("MyType", TypeAttributes.Public);

      ConstructorBuilder constructorBuilder = typeBuilder.DefineConstructor(MethodAttributes.Public, CallingConventions.Standard, null);
      ILGenerator ilGenerator = constructorBuilder.GetILGenerator();
      ilGenerator.EmitWriteLine("MyType instantiated!");
      ilGenerator.Emit(OpCodes.Ret);

      typeBuilder.CreateType();

      assemblyBuilder.Save("temp.dll");
   }
}

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

let instantiateMyType (domain: AppDomain) =
    try
        // You must supply a valid fully qualified assembly name here.
        domain.CreateInstance("Assembly text name, Version, Culture, PublicKeyToken", "MyType")
        |> ignore  
    with e ->
        printfn $"{e.Message}"

// Loads the content of a file to a byte array.
let loadFile filename =
    use fs = new FileStream(filename, FileMode.Open)
    let buffer = Array.zeroCreate<byte> (int fs.Length)
    fs.Read(buffer, 0, buffer.Length) |> ignore
    fs.Close()
    buffer

// Creates a dynamic assembly with symbol information
// and saves them to temp.dll and temp.pdb
let emitAssembly (domain: AppDomain) =
    let assemblyName = AssemblyName()
    assemblyName.Name <- "MyAssembly"

    let assemblyBuilder = domain.DefineDynamicAssembly(assemblyName, AssemblyBuilderAccess.Save)
    let moduleBuilder = assemblyBuilder.DefineDynamicModule("MyModule", "temp.dll", true)
    let typeBuilder = moduleBuilder.DefineType("MyType", TypeAttributes.Public)

    let constructorBuilder = typeBuilder.DefineConstructor(MethodAttributes.Public, CallingConventions.Standard, null)
    let ilGenerator = constructorBuilder.GetILGenerator()
    ilGenerator.EmitWriteLine "MyType instantiated!"
    ilGenerator.Emit OpCodes.Ret

    typeBuilder.CreateType() |> ignore

    assemblyBuilder.Save "temp.dll"

let myResolver (sender: obj) (args: ResolveEventArgs) =
    let domain = sender :?> AppDomain

    // Once the files are generated, this call is
    // actually no longer necessary.
    emitAssembly domain

    let rawAssembly = loadFile "temp.dll"
    let rawSymbolStore = loadFile "temp.pdb"
    domain.Load(rawAssembly, rawSymbolStore)

let currentDomain = AppDomain.CurrentDomain

instantiateMyType currentDomain   // Failed!

currentDomain.add_AssemblyResolve (ResolveEventHandler myResolver)

instantiateMyType currentDomain   // OK!

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

Module Test
   
   Sub Main()
      Dim currentDomain As AppDomain = AppDomain.CurrentDomain
      
      InstantiateMyType(currentDomain)      ' Failed!

      AddHandler currentDomain.AssemblyResolve, AddressOf MyResolver
      
      InstantiateMyType(currentDomain)      ' OK!
   End Sub
   
   
   Sub InstantiateMyType(domain As AppDomain)
      Try
     ' You must supply a valid fully qualified assembly name here.
         domain.CreateInstance("Assembly text name, Version, Culture, PublicKeyToken", "MyType")
      Catch e As Exception
         Console.WriteLine(e.Message)
      End Try
   End Sub
   
   
   ' Loads the content of a file to a byte array. 
   Function loadFile(filename As String) As Byte()
      Dim fs As New FileStream(filename, FileMode.Open)
      Dim buffer(CInt(fs.Length - 1)) As Byte
      fs.Read(buffer, 0, buffer.Length)
      fs.Close()
      
      Return buffer
   End Function 'loadFile
   
   
   Function MyResolver(sender As Object, args As ResolveEventArgs) As System.Reflection.Assembly
      Dim domain As AppDomain = DirectCast(sender, AppDomain)
      
      ' Once the files are generated, this call is
      ' actually no longer necessary.
      EmitAssembly(domain)
      
      Dim rawAssembly As Byte() = loadFile("temp.dll")
      Dim rawSymbolStore As Byte() = loadFile("temp.pdb")
      Dim myAssembly As System.Reflection.Assembly = domain.Load(rawAssembly, rawSymbolStore)
      
      Return myAssembly
   End Function 'MyResolver
   
   
   ' Creates a dynamic assembly with symbol information
   ' and saves them to temp.dll and temp.pdb
   Sub EmitAssembly(domain As AppDomain)
      Dim assemblyName As New AssemblyName()
      assemblyName.Name = "MyAssembly"
      
      Dim assemblyBuilder As AssemblyBuilder = domain.DefineDynamicAssembly(assemblyName, AssemblyBuilderAccess.Save)
      Dim moduleBuilder As ModuleBuilder = assemblyBuilder.DefineDynamicModule("MyModule", "temp.dll", True)
      Dim typeBuilder As TypeBuilder = moduleBuilder.DefineType("MyType", TypeAttributes.Public)
      
      Dim constructorBuilder As ConstructorBuilder = typeBuilder.DefineConstructor(MethodAttributes.Public, CallingConventions.Standard, Nothing)
      Dim ilGenerator As ILGenerator = constructorBuilder.GetILGenerator()
      ilGenerator.EmitWriteLine("MyType instantiated!")
      ilGenerator.Emit(OpCodes.Ret)
      
      typeBuilder.CreateType()
      
      assemblyBuilder.Save("temp.dll")
   End Sub

End Module 'Test

注解

有关此方法的所有重载通用的信息，请参阅 Load(AssemblyName) 方法重载。

从 .NET Framework 4 开始，使用此方法加载的程序集的信任级别与应用程序域的信任级别相同。

Load(AssemblyName)

Source:

AppDomain.cs

在给定 AssemblyName 的情况下加载 Assembly。

public:
 System::Reflection::Assembly ^ Load(System::Reflection::AssemblyName ^ assemblyRef);

public System.Reflection.Assembly Load (System.Reflection.AssemblyName assemblyRef);

member this.Load : System.Reflection.AssemblyName -> System.Reflection.Assembly

Public Function Load (assemblyRef As AssemblyName) As Assembly

参数

assemblyRef

AssemblyName

描述要加载的程序集的对象。

返回

Assembly

加载的程序集。

例外

ArgumentNullException

assemblyRef 为 null。

FileNotFoundException

assemblyRef 未找到。

BadImageFormatException

assemblyRef 对于当前加载的运行时，不是有效的程序集。

AppDomainUnloadedException

在卸载的应用程序域上尝试该操作。

FileLoadException

一个程序集或模块用两个不同的证据加载了两次。

注解

此方法只能用于将程序集加载到当前应用程序域。 提供此方法是为了方便无法调用静态 Assembly.Load 方法的互操作性调用方。 若要将程序集加载到其他应用程序域，请使用 方法，例如 CreateInstanceAndUnwrap。

如果已加载所请求程序集的某个版本，则此方法将返回加载的程序集，即使请求了不同的版本。

不建议为 提供部分程序集名称 assemblyRef 。 (部分名称省略一个或多个区域性、版本或公钥令牌。对于采用字符串而不是 AssemblyName 对象的重载，“MyAssembly， Version=1.0.0.0”是部分名称的示例，“MyAssembly， Version=1.0.0.0， Culture=neutral， PublicKeyToken=18ab3442da84b47”是全名的示例。) 使用部分名称会对性能产生负面影响。 此外，仅当应用程序基目录中存在程序集的确切副本 (或 AppDomainSetup.ApplicationBase) BaseDirectory 时，部分程序集名称才能从全局程序集缓存加载程序集。

如果当前 AppDomain 对象表示应用程序域 A，并且 Load 方法是从应用程序域 B调用的，则程序集将加载到两个应用程序域中。 例如，以下代码将加载 MyAssembly 到新的应用程序域 ChildDomain 以及执行代码的应用程序域中：

AppDomain^ ad = AppDomain::CreateDomain("ChildDomain");
ad->Load("MyAssembly");

AppDomain ad = AppDomain.CreateDomain("ChildDomain");
ad.Load("MyAssembly");

let ad = AppDomain.CreateDomain "ChildDomain"
ad.Load "MyAssembly"

Dim ad As AppDomain  = AppDomain.CreateDomain("ChildDomain")
ad.Load("MyAssembly")

程序集加载到这两个域中，因为 Assembly 不派生自 MarshalByRefObject，因此无法封送方法的 Load 返回值。 相反，公共语言运行时会尝试将程序集加载到调用应用程序域中。 如果两个应用程序域的路径设置不同，则加载到两个应用程序域中的程序集可能不同。

注意

如果同时 AssemblyName.Name 设置了 属性和 AssemblyName.CodeBase 属性，则第一次加载程序集的尝试使用显示名称 (包括版本、区域性等，) 属性返回 Assembly.FullName 。 如果未找到该文件，则 CodeBase 使用 属性搜索程序集。 如果使用 找到 CodeBase程序集，则显示名称与程序集匹配。 如果匹配失败， FileLoadException 则会引发 。

Load(String)

Source:

AppDomain.cs

在给定其显示名称的情况下加载 Assembly。

public:
 System::Reflection::Assembly ^ Load(System::String ^ assemblyString);

public System.Reflection.Assembly Load (string assemblyString);

member this.Load : string -> System.Reflection.Assembly

Public Function Load (assemblyString As String) As Assembly

参数

assemblyString

String

程序集的显示名称。 请参阅 FullName。

返回

Assembly

加载的程序集。

例外

ArgumentNullException

assemblyString 为 null

FileNotFoundException

assemblyString 未找到。

BadImageFormatException

assemblyString 对于当前加载的运行时，不是有效的程序集。

AppDomainUnloadedException

在卸载的应用程序域上尝试该操作。

FileLoadException

一个程序集或模块用两个不同的证据加载了两次。

注解

有关此方法的所有重载通用的信息，请参阅 Load(AssemblyName) 方法重载。

Load(Byte[], Byte[])

Source:

AppDomain.cs

加载带有基于通用对象文件格式 (COFF) 的图像的 Assembly，该图像包含已发出的 Assembly。 还加载表示 Assembly 的符号的原始字节。

public:
 System::Reflection::Assembly ^ Load(cli::array <System::Byte> ^ rawAssembly, cli::array <System::Byte> ^ rawSymbolStore);

public System.Reflection.Assembly Load (byte[] rawAssembly, byte[]? rawSymbolStore);

member this.Load : byte[] * byte[] -> System.Reflection.Assembly

Public Function Load (rawAssembly As Byte(), rawSymbolStore As Byte()) As Assembly

参数

rawAssembly

Byte[]

byte 类型的数组，它是包含已发出程序集的基于 COFF 的图像。

rawSymbolStore

Byte[]

byte 类型的数组，它包含表示程序集符号的原始字节。

返回

Assembly

加载的程序集。

例外

ArgumentNullException

rawAssembly 为 null。

BadImageFormatException

rawAssembly 对于当前加载的运行时，不是有效的程序集。

AppDomainUnloadedException

在卸载的应用程序域上尝试该操作。

FileLoadException

一个程序集或模块用两个不同的证据加载了两次。

示例

以下示例演示如何使用加载原始程序集。

若要运行此代码示例，必须提供完全限定的程序集名称。 有关如何获取完全限定程序集名称的信息，请参阅 程序集名称。

using namespace System;
using namespace System::IO;
using namespace System::Reflection;
using namespace System::Reflection::Emit;
void InstantiateMyType( AppDomain^ domain )
{
   try
   {
      
      // You must supply a valid fully qualified assembly name here.
      domain->CreateInstance( "Assembly text name, Version, Culture, PublicKeyToken", "MyType" );
   }
   catch ( Exception^ e ) 
   {
      Console::WriteLine( e->Message );
   }

}


// Loads the content of a file to a Byte array.
array<Byte>^ loadFile( String^ filename )
{
   FileStream^ fs = gcnew FileStream( filename,FileMode::Open );
   array<Byte>^buffer = gcnew array<Byte>((int)fs->Length);
   fs->Read( buffer, 0, buffer->Length );
   fs->Close();
   return buffer;
}


// Creates a dynamic assembly with symbol information
// and saves them to temp.dll and temp.pdb
void EmitAssembly( AppDomain^ domain )
{
   AssemblyName^ assemblyName = gcnew AssemblyName;
   assemblyName->Name = "MyAssembly";
   AssemblyBuilder^ assemblyBuilder = domain->DefineDynamicAssembly( assemblyName, AssemblyBuilderAccess::Save );
   ModuleBuilder^ moduleBuilder = assemblyBuilder->DefineDynamicModule( "MyModule", "temp.dll", true );
   TypeBuilder^ typeBuilder = moduleBuilder->DefineType( "MyType", TypeAttributes::Public );
   ConstructorBuilder^ constructorBuilder = typeBuilder->DefineConstructor( MethodAttributes::Public, CallingConventions::Standard, nullptr );
   ILGenerator^ ilGenerator = constructorBuilder->GetILGenerator();
   ilGenerator->EmitWriteLine( "MyType instantiated!" );
   ilGenerator->Emit( OpCodes::Ret );
   typeBuilder->CreateType();
   assemblyBuilder->Save( "temp.dll" );
}

ref class Resolver
{
public:
   static Assembly^ MyResolver( Object^ sender, ResolveEventArgs^ args )
   {
      AppDomain^ domain = dynamic_cast<AppDomain^>(sender);
      
      // Once the files are generated, this call is
      // actually no longer necessary.
      EmitAssembly( domain );
      array<Byte>^rawAssembly = loadFile( "temp.dll" );
      array<Byte>^rawSymbolStore = loadFile( "temp.pdb" );
      Assembly^ assembly = domain->Load( rawAssembly, rawSymbolStore );
      return assembly;
   }

};

int main()
{
   AppDomain^ currentDomain = AppDomain::CurrentDomain;
   InstantiateMyType( currentDomain ); // Failed!
   currentDomain->AssemblyResolve += gcnew ResolveEventHandler( Resolver::MyResolver );
   InstantiateMyType( currentDomain ); // OK!
}

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

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

      InstantiateMyType(currentDomain);   // Failed!

      currentDomain.AssemblyResolve += new ResolveEventHandler(MyResolver);

      InstantiateMyType(currentDomain);   // OK!
   }

   static void InstantiateMyType(AppDomain domain) {
      try {
     // You must supply a valid fully qualified assembly name here.
         domain.CreateInstance("Assembly text name, Version, Culture, PublicKeyToken", "MyType");
      } catch (Exception e) {
         Console.WriteLine(e.Message);
      }
   }

   // Loads the content of a file to a byte array.
   static byte[] loadFile(string filename) {
      FileStream fs = new FileStream(filename, FileMode.Open);
      byte[] buffer = new byte[(int) fs.Length];
      fs.Read(buffer, 0, buffer.Length);
      fs.Close();

      return buffer;
   }

   static Assembly MyResolver(object sender, ResolveEventArgs args) {
      AppDomain domain = (AppDomain) sender;

      // Once the files are generated, this call is
      // actually no longer necessary.
      EmitAssembly(domain);

      byte[] rawAssembly = loadFile("temp.dll");
      byte[] rawSymbolStore = loadFile("temp.pdb");
      Assembly assembly = domain.Load(rawAssembly, rawSymbolStore);

      return assembly;
   }

   // Creates a dynamic assembly with symbol information
   // and saves them to temp.dll and temp.pdb
   static void EmitAssembly(AppDomain domain) {
      AssemblyName assemblyName = new AssemblyName();
      assemblyName.Name = "MyAssembly";

      AssemblyBuilder assemblyBuilder = domain.DefineDynamicAssembly(assemblyName, AssemblyBuilderAccess.Save);
      ModuleBuilder moduleBuilder = assemblyBuilder.DefineDynamicModule("MyModule", "temp.dll", true);
      TypeBuilder typeBuilder = moduleBuilder.DefineType("MyType", TypeAttributes.Public);

      ConstructorBuilder constructorBuilder = typeBuilder.DefineConstructor(MethodAttributes.Public, CallingConventions.Standard, null);
      ILGenerator ilGenerator = constructorBuilder.GetILGenerator();
      ilGenerator.EmitWriteLine("MyType instantiated!");
      ilGenerator.Emit(OpCodes.Ret);

      typeBuilder.CreateType();

      assemblyBuilder.Save("temp.dll");
   }
}

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

let instantiateMyType (domain: AppDomain) =
    try
        // You must supply a valid fully qualified assembly name here.
        domain.CreateInstance("Assembly text name, Version, Culture, PublicKeyToken", "MyType")
        |> ignore  
    with e ->
        printfn $"{e.Message}"

// Loads the content of a file to a byte array.
let loadFile filename =
    use fs = new FileStream(filename, FileMode.Open)
    let buffer = Array.zeroCreate<byte> (int fs.Length)
    fs.Read(buffer, 0, buffer.Length) |> ignore
    fs.Close()
    buffer

// Creates a dynamic assembly with symbol information
// and saves them to temp.dll and temp.pdb
let emitAssembly (domain: AppDomain) =
    let assemblyName = AssemblyName()
    assemblyName.Name <- "MyAssembly"

    let assemblyBuilder = domain.DefineDynamicAssembly(assemblyName, AssemblyBuilderAccess.Save)
    let moduleBuilder = assemblyBuilder.DefineDynamicModule("MyModule", "temp.dll", true)
    let typeBuilder = moduleBuilder.DefineType("MyType", TypeAttributes.Public)

    let constructorBuilder = typeBuilder.DefineConstructor(MethodAttributes.Public, CallingConventions.Standard, null)
    let ilGenerator = constructorBuilder.GetILGenerator()
    ilGenerator.EmitWriteLine "MyType instantiated!"
    ilGenerator.Emit OpCodes.Ret

    typeBuilder.CreateType() |> ignore

    assemblyBuilder.Save "temp.dll"

let myResolver (sender: obj) (args: ResolveEventArgs) =
    let domain = sender :?> AppDomain

    // Once the files are generated, this call is
    // actually no longer necessary.
    emitAssembly domain

    let rawAssembly = loadFile "temp.dll"
    let rawSymbolStore = loadFile "temp.pdb"
    domain.Load(rawAssembly, rawSymbolStore)

let currentDomain = AppDomain.CurrentDomain

instantiateMyType currentDomain   // Failed!

currentDomain.add_AssemblyResolve (ResolveEventHandler myResolver)

instantiateMyType currentDomain   // OK!

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

Module Test
   
   Sub Main()
      Dim currentDomain As AppDomain = AppDomain.CurrentDomain
      
      InstantiateMyType(currentDomain)      ' Failed!

      AddHandler currentDomain.AssemblyResolve, AddressOf MyResolver
      
      InstantiateMyType(currentDomain)      ' OK!
   End Sub
   
   
   Sub InstantiateMyType(domain As AppDomain)
      Try
     ' You must supply a valid fully qualified assembly name here.
         domain.CreateInstance("Assembly text name, Version, Culture, PublicKeyToken", "MyType")
      Catch e As Exception
         Console.WriteLine(e.Message)
      End Try
   End Sub
   
   
   ' Loads the content of a file to a byte array. 
   Function loadFile(filename As String) As Byte()
      Dim fs As New FileStream(filename, FileMode.Open)
      Dim buffer(CInt(fs.Length - 1)) As Byte
      fs.Read(buffer, 0, buffer.Length)
      fs.Close()
      
      Return buffer
   End Function 'loadFile
   
   
   Function MyResolver(sender As Object, args As ResolveEventArgs) As System.Reflection.Assembly
      Dim domain As AppDomain = DirectCast(sender, AppDomain)
      
      ' Once the files are generated, this call is
      ' actually no longer necessary.
      EmitAssembly(domain)
      
      Dim rawAssembly As Byte() = loadFile("temp.dll")
      Dim rawSymbolStore As Byte() = loadFile("temp.pdb")
      Dim myAssembly As System.Reflection.Assembly = domain.Load(rawAssembly, rawSymbolStore)
      
      Return myAssembly
   End Function 'MyResolver
   
   
   ' Creates a dynamic assembly with symbol information
   ' and saves them to temp.dll and temp.pdb
   Sub EmitAssembly(domain As AppDomain)
      Dim assemblyName As New AssemblyName()
      assemblyName.Name = "MyAssembly"
      
      Dim assemblyBuilder As AssemblyBuilder = domain.DefineDynamicAssembly(assemblyName, AssemblyBuilderAccess.Save)
      Dim moduleBuilder As ModuleBuilder = assemblyBuilder.DefineDynamicModule("MyModule", "temp.dll", True)
      Dim typeBuilder As TypeBuilder = moduleBuilder.DefineType("MyType", TypeAttributes.Public)
      
      Dim constructorBuilder As ConstructorBuilder = typeBuilder.DefineConstructor(MethodAttributes.Public, CallingConventions.Standard, Nothing)
      Dim ilGenerator As ILGenerator = constructorBuilder.GetILGenerator()
      ilGenerator.EmitWriteLine("MyType instantiated!")
      ilGenerator.Emit(OpCodes.Ret)
      
      typeBuilder.CreateType()
      
      assemblyBuilder.Save("temp.dll")
   End Sub

End Module 'Test

注解

有关此方法的所有重载通用的信息，请参阅 Load(AssemblyName) 方法重载。

从 .NET Framework 4 开始，使用此方法加载的程序集的信任级别与应用程序域的信任级别相同。