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DeliveryRequirementsAttribute Class

Specifies the feature requirements that bindings must provide to the service or client implementation.

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

'Declaration
<AttributeUsageAttribute(AttributeTargets.Class Or AttributeTargets.Interface, AllowMultiple := True)> _
Public NotInheritable Class DeliveryRequirementsAttribute _
	Inherits Attribute _
	Implements IContractBehavior, IContractBehaviorAttribute
'Usage
Dim instance As DeliveryRequirementsAttribute

Use the DeliveryRequirementsAttribute to instruct Windows Communication Foundation (WCF) to confirm that the binding provides the features required by the service or client implementation. If a DeliveryRequirementsAttribute attribute is detected when a service description is loaded from an application configuration file or built programmatically in code, WCF validates the configured binding and supports all the features that the attribute specifies. For example, your service may require the bindings to support queuing. Using DeliveryRequirementsAttribute allows WCF to confirm that the following requirements are met:

The DeliveryRequirementsAttribute attribute is applied to a class, which can implement any number of service contract interfaces. DeliveryRequirementsAttribute can be applied to all the contracts the class implements or to only one of them. The attribute can be applied to a class more than once.

Imports System
Imports System.ServiceModel

<ServiceContract()> _
Public Interface ICalculatorService

    <OperationBehavior()> _
    Function Add(ByVal a As Integer, ByVal b As Integer) As Integer

    <OperationContract()> _
    Function Subtract(ByVal a As Integer, ByVal b As Integer) As Integer 
End Interface

<DeliveryRequirements( _
    QueuedDeliveryRequirements:=QueuedDeliveryRequirementsMode.NotAllowed, _
    RequireOrderedDelivery:=True _
)> _
Class CalculatorService
    Public Function add(ByVal a As Integer, ByVal b As Integer) As Integer
        Console.WriteLine("Add called")
        Return a + b
    End Function 

    Public Function Subtract(ByVal a As Integer, ByVal b As Integer) As Integer
        Console.WriteLine("Subtract called.")
        Return a - b
    End Function 

    Public Function Multiply(ByVal a As Integer, ByVal b As Integer) As Integer 
        Return a * b
    End Function 
End Class

System.Object
  System.Attribute
    System.ServiceModel.DeliveryRequirementsAttribute

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

Windows 7, Windows Vista, Windows XP SP2, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003

The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

.NET Framework

Supported in: 3.5, 3.0

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