AppDomainManager Class (System)

AppDomainManager Class

.NET Framework 4

Other Versions

Provides a managed equivalent of an unmanaged host.

Namespace: System
Assembly: mscorlib (in mscorlib.dll)

Syntax

C++

JScript

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'Declaration

<ComVisibleAttribute(True)> _
<SecurityPermissionAttribute(SecurityAction.InheritanceDemand, Flags := SecurityPermissionFlag.Infrastructure)> _
Public Class AppDomainManager _
	Inherits MarshalByRefObject

Exceptions

Exception	Condition
SecurityException	The caller does not have the correct permissions. See the Requirements section.

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.

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.

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.

Examples

The following example shows a very simple implementation of AppDomainManager.

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' 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
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 'New

    Public Overrides Sub InitializeNewDomain(ByVal appDomainInfo _
        As AppDomainSetup) 
        Console.Write("Initialize new domain called:  ")
        Console.WriteLine(AppDomain.CurrentDomain.FriendlyName)
        InitializationFlags = _
            AppDomainManagerInitializationOptions.RegisterWithHost   
    End Sub 'InitializeNewDomain

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

.NET Framework Security

SecurityCriticalAttribute
Requires full trust for the immediate caller. This member cannot be used by partially trusted or transparent code.
SecurityAction.InheritanceDemand
for derived classes to plug executable code into the common language runtime hosting infrastructure. Associated enumeration: SecurityPermissionFlag.Infrastructure.

Inheritance Hierarchy

System.Object
System.MarshalByRefObject
System.AppDomainManager

Thread Safety

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

Platforms

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role not supported), 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.

Version Information

.NET Framework

Supported in: 4, 3.5, 3.0, 2.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Reference

AppDomainManager Members

System Namespace

Community ContentAdd

FAQ

Why the APTCA attribute?

Using the sample code above in my own application caused me an "Inheritance security rules violated by type" error, seemingly caused by the APTCA assembly attribute that you've included with the derived app domain manager class. Can anyone explain why the attribute is there?

History

6/29/2010
gdsx-roman