InterfaceQueuingAttribute Class
 

Enables queuing support for the marked interface. This class cannot be inherited.

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

SystemObject
   SystemAttribute
    System.EnterpriseServicesInterfaceQueuingAttribute

[AttributeUsageAttribute(AttributeTargets.Class | AttributeTargets.Interface, 
	Inherited = true, AllowMultiple = true)]
[ComVisibleAttribute(false)]
public sealed class InterfaceQueuingAttribute : Attribute
[AttributeUsageAttribute(AttributeTargets::Class | AttributeTargets::Interface, 
	Inherited = true, AllowMultiple = true)]
[ComVisibleAttribute(false)]
public ref class InterfaceQueuingAttribute sealed : Attribute
[<Sealed>]
[<AttributeUsageAttribute(AttributeTargets.Class | AttributeTargets.Interface,
    Inherited = true, AllowMultiple = true)>]
[<ComVisibleAttribute(false)>]
type InterfaceQueuingAttribute = 
    class
        inherit Attribute
    end
<AttributeUsageAttribute(AttributeTargets.Class Or AttributeTargets.Interface,
	Inherited := True, AllowMultiple := True)>
<ComVisibleAttribute(False)>
Public NotInheritable Class InterfaceQueuingAttribute
	Inherits Attribute
NameDescription
System_CAPS_pubmethod InterfaceQueuingAttribute

Initializes a new instance of the InterfaceQueuingAttribute class setting the and properties to their default values.

System_CAPS_pubmethod InterfaceQueuingAttribute

Initializes a new instance of the InterfaceQueuingAttribute class, optionally disabling queuing support.

NameDescription
System_CAPS_pubproperty

Gets or sets a value indicating whether queuing support is enabled.

System_CAPS_pubproperty

Gets or sets the name of the interface on which queuing is enabled.

System_CAPS_pubproperty

When implemented in a derived class, gets a unique identifier for this Attribute.(Inherited from Attribute.)

NameDescription
System_CAPS_pubmethod Equals

This API supports the product infrastructure and is not intended to be used directly from your code. Returns a value that indicates whether this instance is equal to a specified object.(Inherited from Attribute.)

System_CAPS_pubmethod GetHashCode

Returns the hash code for this instance.(Inherited from Attribute.)

System_CAPS_pubmethod GetType

Gets the Type of the current instance.(Inherited from Object.)

System_CAPS_pubmethod 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.)

System_CAPS_pubmethod Match

When overridden in a derived class, returns a value that indicates whether this instance equals a specified object.(Inherited from Attribute.)

System_CAPS_pubmethod ToString

Returns a string that represents the current object.(Inherited from Object.)

NameDescription
System_CAPS_pubinterface System_CAPS_privmethod _AttributeGetIDsOfNames

Maps a set of names to a corresponding set of dispatch identifiers.(Inherited from Attribute.)

System_CAPS_pubinterface System_CAPS_privmethod _AttributeGetTypeInfo

Retrieves the type information for an object, which can be used to get the type information for an interface.(Inherited from Attribute.)

System_CAPS_pubinterface System_CAPS_privmethod _AttributeGetTypeInfoCount

Retrieves the number of type information interfaces that an object provides (either 0 or 1).(Inherited from Attribute.)

System_CAPS_pubinterface System_CAPS_privmethod _AttributeInvoke

Provides access to properties and methods exposed by an object.(Inherited from Attribute.)

Calls on this interface will be queued using Message Queuing.

To mark an interface as queued, apply this attribute to the interface using the following syntax: [InterfaceQueuing].

The member methods of a queued interface must fulfill the requirements for queued method calls, such as having no out or ref parameters.

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

The following code example shows how to use the InterfaceQueuingAttribute attribute.

public interface IQueuedComponent
{
    void QueuedTask();
}
// Mark IQueuedComponent interface as queued
[InterfaceQueuing(true, Interface="IQueuedComponent")]
// Create the queued component class by inheriting the 
// System.EnterpriseServices.ServicedComponent class and an
// interface that is marked as queued with the InterfaceQueuing attribute
public class QueuedComponent : ServicedComponent, IQueuedComponent
{
    public void QueuedTask()
    {
        // Perform queued task here
    }
}
public interface class IQueuedComponent
{
   void QueuedTask();
};


// Mark IQueuedComponent interface as queued
// Create the queued component class by inheriting the 
// System.EnterpriseServices.ServicedComponent class and an
// interface that is marked as queued with the InterfaceQueuing attribute

[InterfaceQueuing(true,Interface="IQueuedComponent")]
public ref class QueuedComponent sealed: public ServicedComponent, public IQueuedComponent
{
public:
   virtual void QueuedTask()
   {
      // Perform queued task here
   }

};

The following code example shows how to mark a COM+ application as queued at compile time by using the ApplicationQueuing attribute, and enable the COM+ listener by setting the QueueListenerEnabled to true

// Mark the COM+ application as queued at compile time by using the 
// ApplicationQueuing attribute. Enable the COM+ listener by 
// setting the QueueListenerEnabled to true
[assembly: ApplicationQueuing(Enabled=true, QueueListenerEnabled=true)]
// Mark the COM+ application as queued at compile time by using the 
// ApplicationQueuing attribute. Enable the COM+ listener by 
// setting the QueueListenerEnabled to true
[assembly:ApplicationQueuing(Enabled=true,QueueListenerEnabled=true)];

The following code example shows how to use BindToMoniker to run the queued moniker, to get an instance of the recorder, call the method that will be recorded, and force the release of the recorder object, to send the message to the queue.

// Use BindToMoniker to run the queued moniker, to get an instance of the recorder
IQueuedComponent qc = 
    (IQueuedComponent)System.Runtime.InteropServices.Marshal.BindToMoniker("queue:/new:QueuedComponent");
// Call the method that will be recorded
qc.QueuedTask();

// Force the release of the recorder object, to send the message to the queue
System.Runtime.InteropServices.Marshal.ReleaseComObject(qc);
// Use BindToMoniker to run the queued moniker, to get an instance of the recorder
IQueuedComponent ^ qc = dynamic_cast<IQueuedComponent^>(System::Runtime::InteropServices::Marshal::BindToMoniker( "queue:/new:QueuedComponent" ));

// Call the method that will be recorded
qc->QueuedTask();

// Force the release of the recorder object, to send the message to the queue
System::Runtime::InteropServices::Marshal::ReleaseComObject( qc );
.NET Framework
Available since 1.1

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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