AppDomain::CreateInstanceAndUnwrap Method (String, String)
Creates a new instance of the specified type. Parameters specify the assembly where the type is defined, and the name of the type.
Assembly: mscorlib (in mscorlib.dll)
Parameters
- assemblyName
- Type: System::String
The display name of the assembly. See Assembly::FullName.
- typeName
- Type: System::String
The fully qualified name of the requested type, including the namespace but not the assembly, as returned by the Type::FullName property.
| Exception | Condition |
|---|---|
| ArgumentNullException | assemblyName or typeName is nullptr. |
| MissingMethodException | No matching public constructor was found. |
| TypeLoadException | typename was not found in assemblyName. |
| FileNotFoundException | assemblyName was not found. |
| MethodAccessException | The caller does not have permission to call this constructor. |
| AppDomainUnloadedException | The operation is attempted on an unloaded application domain. |
| BadImageFormatException | assemblyName is not a valid assembly. -or- Version 2.0 or later of the common language runtime is currently loaded and assemblyName was compiled with a later version. |
| FileLoadException | An assembly or module was loaded twice with two different evidences. |
This is a convenience method that combines CreateInstance and ObjectHandle::Unwrap. This method calls the default 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. |
The following code example shows the simplest way to execute code in another application domain. The example defines a class named Worker that inherits from MarshalByRefObject. The Worker class defines a method that displays the name of the application domain in which it is executing. The example creates instances of Worker in the default application domain and in a new application domain.
Note |
|---|
The assembly that contains Worker must be loaded into both application domains, but it can load other assemblies that exist only in the new application domain. |
using namespace System; using namespace System::Reflection; public ref class Worker : MarshalByRefObject { public: void PrintDomain() { Console::WriteLine("Object is executing in AppDomain \"{0}\"", AppDomain::CurrentDomain->FriendlyName); } }; void main() { // Create an ordinary instance in the current AppDomain Worker^ localWorker = gcnew Worker(); localWorker->PrintDomain(); // Create a new application domain, create an instance // of Worker in the application domain, and execute code // there. AppDomain^ ad = AppDomain::CreateDomain("New domain"); Worker^ remoteWorker = (Worker^) ad->CreateInstanceAndUnwrap( Assembly::GetExecutingAssembly()->FullName, "Worker"); remoteWorker->PrintDomain(); } /* This code produces output similar to the following: Object is executing in AppDomain "source.exe" Object is executing in AppDomain "New domain" */
- FileIOPermissionAccess
for the ability to access the location of the assembly if code base is supplied by a configuration file. Associated enumeration: FileIOPermissionAccess::PathDiscovery
- FileIOPermissionAccess
for the ability to read the file containing the assembly manifest, or if you are creating a type from a module other than the manifest file. Associated enumeration: FileIOPermissionAccess::Read
- WebPermission
for the ability to access the location of the assembly if the assembly is not local.
Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.
Note