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JustInTimeActivationAttribute Class

Turns just-in-time (JIT) activation on or off. This class cannot be inherited.

System.Object
  System.Attribute
    System.EnterpriseServices.JustInTimeActivationAttribute

Namespace:  System.EnterpriseServices
Assembly:  System.EnterpriseServices (in System.EnterpriseServices.dll)
[ComVisibleAttribute(false)]
[AttributeUsageAttribute(AttributeTargets.Class, Inherited = true)]
public sealed class JustInTimeActivationAttribute : Attribute

The JustInTimeActivationAttribute type exposes the following members.

  Name Description
Public method JustInTimeActivationAttribute() Initializes a new instance of the JustInTimeActivationAttribute class. The default constructor enables just-in-time (JIT) activation.
Public method JustInTimeActivationAttribute(Boolean) Initializes a new instance of the JustInTimeActivationAttribute class, optionally allowing the disabling of just-in-time (JIT) activation by passing false as the parameter.
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  Name Description
Public property TypeId When implemented in a derived class, gets a unique identifier for this Attribute. (Inherited from Attribute.)
Public property Value Gets the value of the JustInTimeActivationAttribute setting.
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  Name Description
Public method Equals Infrastructure. Returns a value that indicates whether this instance is equal to a specified object. (Inherited from Attribute.)
Protected method Finalize Allows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection. (Inherited from Object.)
Public method GetHashCode Returns the hash code for this instance. (Inherited from Attribute.)
Public method GetType Gets the Type of the current instance. (Inherited from Object.)
Public method IsDefaultAttribute When overridden in a derived class, indicates whether the value of this instance is the default value for the derived class. (Inherited from Attribute.)
Public method Match When overridden in a derived class, returns a value that indicates whether this instance equals a specified object. (Inherited from Attribute.)
Protected method MemberwiseClone Creates a shallow copy of the current Object. (Inherited from Object.)
Public method ToString Returns a string that represents the current object. (Inherited from Object.)
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  Name Description
Explicit interface implemetation Private method _Attribute.GetIDsOfNames Maps a set of names to a corresponding set of dispatch identifiers. (Inherited from Attribute.)
Explicit interface implemetation Private method _Attribute.GetTypeInfo Retrieves the type information for an object, which can be used to get the type information for an interface. (Inherited from Attribute.)
Explicit interface implemetation Private method _Attribute.GetTypeInfoCount Retrieves the number of type information interfaces that an object provides (either 0 or 1). (Inherited from Attribute.)
Explicit interface implemetation Private method _Attribute.Invoke Provides access to properties and methods exposed by an object. (Inherited from Attribute.)
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If JIT activation is specified, then it must not be disabled in the COM+ catalog, and vice versa. If enabled in the COM+ catalog, it must be specified on the component.

JIT activation defaults to off for components which are configured in COM+, but is enabled automatically if automatic transactions are requested.

For more information about using attributes, see Extending Metadata Using Attributes.

The following code example demonstrates the use of this attribute.


using System;
using System.EnterpriseServices;
using System.Windows.Forms;

[assembly: ApplicationName("ObjectInspector")]
[assembly: ApplicationActivation(ActivationOption.Server)]
[assembly: System.Reflection.AssemblyKeyFile("Inspector.snk")]

[JustInTimeActivation]
[ObjectPooling(MinPoolSize=2, MaxPoolSize=100, CreationTimeout=1000)]
public class ObjectInspector : ServicedComponent
{

    public string IdentifyObject (Object obj)
    {
        // Return this object to the pool after use.
        ContextUtil.DeactivateOnReturn = true;

        // Get the supplied object's type.        
        Type objType = obj.GetType();

        // Return its name.
        return(objType.FullName);

    }

    protected override void Activate()
    {
        MessageBox.Show( String.Format("Now entering...\nApplication: {0}\nInstance: {1}\nContext: {2}\n",
                                       ContextUtil.ApplicationId.ToString(), ContextUtil.ApplicationInstanceId.ToString(),
                                       ContextUtil.ContextId.ToString() ) );
    }

    protected override void Deactivate()
    {
        MessageBox.Show("Bye Bye!");
    }

    // This object can be pooled.
    protected override bool CanBePooled()
    {
        return(true);
    }

}


.NET Framework

Supported in: 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

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