InterfaceQueuingAttribute Class

 

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

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

System.Object
  System.Attribute
    System.EnterpriseServices.InterfaceQueuingAttribute

[AttributeUsageAttribute(AttributeTargets.Class | AttributeTargets.Interface, 
	Inherited = true, AllowMultiple = true)]
[ComVisibleAttribute(false)]
public sealed class InterfaceQueuingAttribute : Attribute

NameDescription
System_CAPS_pubmethodInterfaceQueuingAttribute()

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

System_CAPS_pubmethodInterfaceQueuingAttribute(Boolean)

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

NameDescription
System_CAPS_pubpropertyEnabled

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

System_CAPS_pubpropertyInterface

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

System_CAPS_pubpropertyTypeId

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

NameDescription
System_CAPS_pubmethodEquals(Object)

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_pubmethodGetHashCode()

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

System_CAPS_pubmethodGetType()

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

System_CAPS_pubmethodIsDefaultAttribute()

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_pubmethodMatch(Object)

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

System_CAPS_pubmethodToString()

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

NameDescription
System_CAPS_pubinterfaceSystem_CAPS_privmethod_Attribute.GetIDsOfNames(Guid, IntPtr, UInt32, UInt32, IntPtr)

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

System_CAPS_pubinterfaceSystem_CAPS_privmethod_Attribute.GetTypeInfo(UInt32, UInt32, IntPtr)

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

System_CAPS_pubinterfaceSystem_CAPS_privmethod_Attribute.GetTypeInfoCount(UInt32)

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

System_CAPS_pubinterfaceSystem_CAPS_privmethod_Attribute.Invoke(UInt32, Guid, UInt32, Int16, IntPtr, IntPtr, IntPtr, IntPtr)

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
    }
}

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)]

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);

.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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