MarshalByRefObject Class
Enables access to objects across application domain boundaries in applications that support remoting.
Assembly: mscorlib (in mscorlib.dll)
The MarshalByRefObject type exposes the following members.
| Name | Description | |
|---|---|---|
![]() | CreateObjRef | Creates an object that contains all the relevant information required to generate a proxy used to communicate with a remote object. |
![]() ![]() | Equals(Object) | Determines whether the specified Object is equal to the current Object. (Inherited from Object.) |
![]() ![]() | Finalize | Allows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection. (Inherited from Object.) |
![]() ![]() | GetHashCode | Serves as a hash function for a particular type. (Inherited from Object.) |
![]() | GetLifetimeService | Retrieves the current lifetime service object that controls the lifetime policy for this instance. |
![]() ![]() | GetType | Gets the Type of the current instance. (Inherited from Object.) |
![]() | InitializeLifetimeService | Obtains a lifetime service object to control the lifetime policy for this instance. |
![]() ![]() | MemberwiseClone() | Creates a shallow copy of the current Object. (Inherited from Object.) |
![]() | MemberwiseClone(Boolean) | Creates a shallow copy of the current MarshalByRefObject object. |
![]() ![]() | ToString | Returns a string that represents the current object. (Inherited from Object.) |
An application domain is a partition in an operating system process where one or more applications reside. Objects in the same application domain communicate directly. Objects in different application domains communicate either by transporting copies of objects across application domain boundaries, or by using a proxy to exchange messages.
MarshalByRefObject is the base class for objects that communicate across application domain boundaries by exchanging messages using a proxy. Objects that do not inherit from MarshalByRefObject are implicitly marshal by value. When a remote application references a marshal by value object, a copy of the object is passed across application domain boundaries.
MarshalByRefObject objects are accessed directly within the boundaries of the local application domain. The first time an application in a remote application domain accesses a MarshalByRefObject, a proxy is passed to the remote application. Subsequent calls on the proxy are marshaled back to the object residing in the local application domain.
Types must inherit from MarshalByRefObject when the type is used across application domain boundaries, and the state of the object must not be copied because the members of the object are not usable outside the application domain where they were created.
This section contains two code examples. The first code example shows how to create an instance of a class in another application domain. The second code example shows a simple class that can be used for remoting.
Example 1
The following code example shows the simplest way to execute code in another application domain. The example defines a class named Worker that inherits MarshalByRefObject, with 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 could load other assemblies that would 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" */
Example 2
The following example demonstrates a class derived from MarshalByRefObject that is used later in remoting.
using namespace System; using namespace System::Runtime::Remoting; using namespace System::Security::Permissions; public ref class SetObjectUriForMarshalTest { public: ref class TestClass: public MarshalByRefObject{}; [SecurityPermissionAttribute(SecurityAction::Demand, Flags=SecurityPermissionFlag::RemotingConfiguration)] static void Main() { TestClass^ obj = gcnew TestClass; RemotingServices::SetObjectUriForMarshal( obj, "testUri" ); RemotingServices::Marshal(obj); Console::WriteLine( RemotingServices::GetObjectUri( obj ) ); } };
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.
System::MarshalByRefObject
Microsoft.Build.Utilities::AppDomainIsolatedTask
Microsoft.Build.Utilities::TaskItem
Microsoft.Build.Utilities::TaskLoggingHelper
Microsoft.Win32::RegistryKey
System.AddIn.Pipeline::ContractBase
System::AppDomain
System::AppDomainManager
System.ComponentModel::Component
System::ContextBoundObject
System.Data.Common::DataColumnMapping
System.Data.Common::DataColumnMappingCollection
System.Data.Common::DataTableMapping
System.Data.Common::DataTableMappingCollection
System.Data.Common::DbDataReader
System.Data.Common::DbParameter
System.Data.Common::DbParameterCollection
System.Data.Common::DbTransaction
System.Diagnostics::TraceListener
System.DirectoryServices::SearchResultCollection
System.Drawing::Brush
System.Drawing.Drawing2D::CustomLineCap
System.Drawing.Drawing2D::GraphicsContainer
System.Drawing.Drawing2D::GraphicsPath
System.Drawing.Drawing2D::GraphicsPathIterator
System.Drawing.Drawing2D::GraphicsState
System.Drawing.Drawing2D::Matrix
System.Drawing::Font
System.Drawing::FontFamily
System.Drawing::Graphics
System.Drawing::Icon
System.Drawing::Image
System.Drawing::Pen
System.Drawing::Region
System.Drawing::StringFormat
System.EnterpriseServices.Internal::AssemblyLocator
System.EnterpriseServices::RegistrationHelper
System.IO::FileSystemInfo
System.IO.IsolatedStorage::IsolatedStorage
System.IO::Stream
System.IO::TextReader
System.IO::TextWriter
System.Messaging::MessageEnumerator
System.Messaging::MessageQueueEnumerator
System.Net::WebRequest
System.Net::WebResponse
System.Reflection::AssemblyNameProxy
System.Runtime.InteropServices::StandardOleMarshalObject
System.Runtime.Remoting.Lifetime::ClientSponsor
System.Runtime.Remoting::ObjectHandle
System.Speech.Recognition.SrgsGrammar::SrgsElement
System.Threading::RegisteredWaitHandle
System.Threading::Timer
System.Threading::WaitHandle
System.Web.Compilation::ClientBuildManager
System.Web.Compilation::ClientBuildManagerCallback
System.Web.Hosting::AppDomainProtocolHandler
System.Web.Hosting::ApplicationManager
System.Web.Hosting::HostingEnvironment
System.Web.Hosting::ISAPIRuntime
System.Web.Hosting::ProcessHost
System.Web.Hosting::ProcessHostFactoryHelper
System.Web.Hosting::ProcessProtocolHandler
System.Web.Hosting::VirtualFileBase
System.Web.Hosting::VirtualPathProvider
System.Windows.Forms::BaseCollection
System.Windows.Forms::NativeWindow
System.Windows.Forms::NumericUpDownAccelerationCollection
System.Windows.Forms::OwnerDrawPropertyBag
System.Windows.Forms::TreeNode
System.Windows.Interop::DocObjHost
System.Workflow.Runtime.DebugEngine::DebugController



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