AppDomainManager Class

Definition

Namespace:

System

Assembly:

mscorlib.dll

Provides a managed equivalent of an unmanaged host.

public ref class AppDomainManager : MarshalByRefObject

[System.Runtime.InteropServices.ComVisible(true)]
[System.Security.SecurityCritical]
public class AppDomainManager : MarshalByRefObject

[<System.Runtime.InteropServices.ComVisible(true)>]
[<System.Security.SecurityCritical>]
type AppDomainManager = class
    inherit MarshalByRefObject

Public Class AppDomainManager
Inherits MarshalByRefObject

Inheritance

Object

MarshalByRefObject

AppDomainManager

Attributes

ComVisibleAttribute SecurityCriticalAttribute

Examples

The following example shows a very simple implementation of AppDomainManager.

// To replace the default AppDomainManager, identify  the
// replacement assembly and replacement type in the
// APPDOMAIN_MANAGER_ASM and APPDOMAIN_MANAGER_TYPE
// environment variables. For example:
// set APPDOMAIN_MANAGER_TYPE=library.TestAppDomainManager
// set APPDOMAIN_MANAGER_ASM=library, Version=1.0.0.0, Culture=neutral, PublicKeyToken=f1368f7b12a08d72

using System;
using System.Collections;
using System.Net;
using System.Reflection;
using System.Security;
using System.Security.Policy;
using System.Security.Principal;
using System.Threading;
using System.Runtime.InteropServices;

[assembly: System.Security.AllowPartiallyTrustedCallersAttribute()]

namespace MyNamespace
{
    [GuidAttribute("F4D15099-3407-4A7E-A607-DEA440CF3891")]
    public class MyAppDomainManager : AppDomainManager
    {
        private HostSecurityManager mySecurityManager = null;

        public MyAppDomainManager()
        {
            Console.WriteLine(" My AppDomain Manager ");
            mySecurityManager = AppDomain.CurrentDomain.CreateInstanceAndUnwrap(
                "CustomSecurityManager, Version=1.0.0.3, Culture=neutral, " +
                "PublicKeyToken=5659fc598c2a503e",
                "MyNamespace.MySecurityManager") as HostSecurityManager;
            Console.WriteLine(" Custom Security Manager Created.");
        }

        public override void InitializeNewDomain(AppDomainSetup appDomainInfo)
        {
            Console.Write("Initialize new domain called:  ");
            Console.WriteLine(AppDomain.CurrentDomain.FriendlyName);
            InitializationFlags =
                AppDomainManagerInitializationOptions.RegisterWithHost;
        }

        public override HostSecurityManager HostSecurityManager
        {
            get
            {
                return mySecurityManager;
            }
        }
    }
}

' To replace the default AppDomainManager, identify  the 
' replacement assembly and replacement type in the 
' APPDOMAIN_MANAGER_ASM and APPDOMAIN_MANAGER_TYPE  
' environment variables. For example:
' set APPDOMAIN_MANAGER_TYPE=library.TestAppDomainManager
' set APPDOMAIN_MANAGER_ASM=library, Version=1.0.0.0, Culture=neutral, PublicKeyToken=f1368f7b12a08d72
Imports System.Collections
Imports System.Net
Imports System.Reflection
Imports System.Security
Imports System.Security.Permissions
Imports System.Security.Policy
Imports System.Security.Principal
Imports System.Threading
Imports System.Runtime.InteropServices

<assembly: System.Security.AllowPartiallyTrustedCallersAttribute()>
<SecurityPermissionAttribute(SecurityAction.LinkDemand, _
    Flags:=SecurityPermissionFlag.Infrastructure)> _
<SecurityPermissionAttribute(SecurityAction.InheritanceDemand, _
    Flags:=SecurityPermissionFlag.Infrastructure)> _
<GuidAttribute("F4D15099-3407-4A7E-A607-DEA440CF3891")> _
Public Class MyAppDomainManager
    Inherits AppDomainManager
    Private mySecurityManager As HostSecurityManager = Nothing
    
    Public Sub New() 
        Console.WriteLine(" My AppDomain Manager ")
        mySecurityManager = AppDomain.CurrentDomain.CreateInstanceAndUnwrap( _
            "CustomSecurityManager, Version=1.0.0.3, Culture=neutral, " & _
            "PublicKeyToken=5659fc598c2a503e", "MyNamespace.MySecurityManager")
        Console.WriteLine(" Custom Security Manager Created.")    
    End Sub
    
    Public Overrides Sub InitializeNewDomain(ByVal appDomainInfo _
        As AppDomainSetup) 
        Console.Write("Initialize new domain called:  ")
        Console.WriteLine(AppDomain.CurrentDomain.FriendlyName)
        InitializationFlags = _
            AppDomainManagerInitializationOptions.RegisterWithHost   
    End Sub

    Public Overrides ReadOnly Property HostSecurityManager() _
        As HostSecurityManager 
        Get
            Return mySecurityManager
        End Get
    End Property
End Class

Remarks

Important

Do not use AppDomainManager to configure an application domain in ASP.NET. In ASP.NET, configuration must be handled by the host.

Implementing the AppDomainManager class enables a hosting application to participate in the creation of new application domains. To replace the default AppDomainManager, identify the assembly and type of the replacement AppDomainManager in the APPDOMAIN_MANAGER_ASM and APPDOMAIN_MANAGER_TYPE environment variables, or use the <appDomainManagerAssembly> and <appDomainManagerType> elements in your configuration file. The assembly must be fully trusted and be contained in the global assembly cache or the directory of the starting application. The type and assembly names must be fully qualified in the environment variables. For example:

set APPDOMAIN_MANAGER_TYPE=MyNamespace.TestAppDomainManager

set APPDOMAIN_MANAGER_ASM=customappDomainmanager, Version=1.0.0.0, Culture=neutral, PublicKeyToken=f1368f7b12a08d72

Important

If the assembly that contains your subclass of AppDomainManager depends on assemblies that are marked with the conditional AllowPartiallyTrustedCallersAttribute (APTCA) attribute, you must include those assemblies in the list that you pass to the PartialTrustVisibleAssemblies property of the AppDomainSetup you use to create application domains. Otherwise, the assemblies that are marked with the conditional APTCA attribute will be disabled.

The AppDomainManager is the managed equivalent of the unmanaged host. An AppDomainManager object participates in the creation of new application domains in a process and can customize the new AppDomain before other managed code runs. The AppDomainManager can also supply host managers that participate in other aspects of common language runtime execution. For example, an AppDomainManager can identify a HostSecurityManager object that participates in the security decisions of the application domain.

Note

Only assemblies granted FullTrust, such as assemblies in the global assembly cache or identified as fullTrustAssemblies in the AppDomain.CreateDomain(String, Evidence, AppDomainSetup, PermissionSet, StrongName[]) method can be loaded in the AppDomainManager constructor and the InitializeNewDomain method.

Note

This class contains a link demand and an inheritance demand at the class level. A SecurityException is thrown when either the immediate caller or the derived class does not have infrastructure permission. For details about security demands, see Link Demands and Inheritance Demands.

Constructors

AppDomainManager()

Initializes a new instance of the AppDomainManager class.

Properties

ApplicationActivator	Gets the application activator that handles the activation of add-ins and manifest-based applications for the domain.
EntryAssembly	Gets the entry assembly for an application.
HostExecutionContextManager	Gets the host execution context manager that manages the flow of the execution context.
HostSecurityManager	Gets the host security manager that participates in security decisions for the application domain.
InitializationFlags	Gets the initialization flags for custom application domain managers.

Methods

CheckSecuritySettings(SecurityState)	Indicates whether the specified operation is allowed in the application domain.
CreateDomain(String, Evidence, AppDomainSetup)	Returns a new or existing application domain.
CreateDomainHelper(String, Evidence, AppDomainSetup)	Provides a helper method to create an application domain.
CreateObjRef(Type)	Creates an object that contains all the relevant information required to generate a proxy used to communicate with a remote object. (Inherited from MarshalByRefObject)
Equals(Object)	Determines whether the specified object is equal to the current object. (Inherited from Object)
GetHashCode()	Serves as the default hash function. (Inherited from Object)
GetLifetimeService()	Retrieves the current lifetime service object that controls the lifetime policy for this instance. (Inherited from MarshalByRefObject)
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. (Inherited from MarshalByRefObject)
InitializeNewDomain(AppDomainSetup)	Initializes the new application domain.
MemberwiseClone()	Creates a shallow copy of the current Object. (Inherited from Object)
MemberwiseClone(Boolean)	Creates a shallow copy of the current MarshalByRefObject object. (Inherited from MarshalByRefObject)
ToString()	Returns a string that represents the current object. (Inherited from Object)