.NET Framework Class Library
DeliveryRequirementsAttribute Class

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

Inheritance Hierarchy
SystemObject
   SystemAttribute
    System.ServiceModelDeliveryRequirementsAttribute

Namespace:   System.ServiceModel
Assembly:  System.ServiceModel (in System.ServiceModel.dll)
Syntax
<[%$TOPIC/ms576156_en-us_VS_110_2_0_0_0_0%]([%$TOPIC/ms576156_en-us_VS_110_2_0_0_0_1%].Class Or [%$TOPIC/ms576156_en-us_VS_110_2_0_0_0_2%].Interface, AllowMultiple := True)> _
Public NotInheritable Class DeliveryRequirementsAttribute _
	Inherits [%$TOPIC/ms576156_en-us_VS_110_2_0_0_0_3%] _
	Implements [%$TOPIC/ms576156_en-us_VS_110_2_0_0_0_4%], [%$TOPIC/ms576156_en-us_VS_110_2_0_0_0_5%]
[[%$TOPIC/ms576156_en-us_VS_110_2_0_1_0_0%]([%$TOPIC/ms576156_en-us_VS_110_2_0_1_0_1%].Class|[%$TOPIC/ms576156_en-us_VS_110_2_0_1_0_2%].Interface, AllowMultiple = true)]
public sealed class DeliveryRequirementsAttribute : [%$TOPIC/ms576156_en-us_VS_110_2_0_1_0_3%], 
	[%$TOPIC/ms576156_en-us_VS_110_2_0_1_0_4%], [%$TOPIC/ms576156_en-us_VS_110_2_0_1_0_5%]
[[%$TOPIC/ms576156_en-us_VS_110_2_0_2_0_0%]([%$TOPIC/ms576156_en-us_VS_110_2_0_2_0_1%]::Class|[%$TOPIC/ms576156_en-us_VS_110_2_0_2_0_2%]::Interface, AllowMultiple = true)]
public ref class DeliveryRequirementsAttribute sealed : public [%$TOPIC/ms576156_en-us_VS_110_2_0_2_0_3%], 
	[%$TOPIC/ms576156_en-us_VS_110_2_0_2_0_4%], [%$TOPIC/ms576156_en-us_VS_110_2_0_2_0_5%]
[<[%$TOPIC/ms576156_en-us_VS_110_2_0_3_0_0%]>]
[<[%$TOPIC/ms576156_en-us_VS_110_2_0_3_0_1%]([%$TOPIC/ms576156_en-us_VS_110_2_0_3_0_2%].Class|[%$TOPIC/ms576156_en-us_VS_110_2_0_3_0_3%].Interface, AllowMultiple = true)>]
type DeliveryRequirementsAttribute =  
    class 
        inherit [%$TOPIC/ms576156_en-us_VS_110_2_0_3_0_4%] 
        interface [%$TOPIC/ms576156_en-us_VS_110_2_0_3_0_5%] 
        interface [%$TOPIC/ms576156_en-us_VS_110_2_0_3_0_6%] 
    end

The DeliveryRequirementsAttribute type exposes the following members.

Constructors
  NameDescription
Public method DeliveryRequirementsAttributeInitializes a new instance of the DeliveryRequirementsAttribute class.
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Properties
  NameDescription
Public property QueuedDeliveryRequirementsSpecifies whether the binding for a service must support queued contracts.
Public property RequireOrderedDeliverySpecifies whether the binding must support ordered messages.
Public property TargetContractGets or sets the type to which it applies.
Public property TypeIdWhen implemented in a derived class, gets a unique identifier for this Attribute. (Inherited from Attribute.)
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Methods
  NameDescription
Public method EqualsInfrastructure. Returns a value that indicates whether this instance is equal to a specified object. (Inherited from Attribute.)
Public method GetHashCodeReturns the hash code for this instance. (Inherited from Attribute.)
Public method GetTypeGets the Type of the current instance. (Inherited from Object.)
Public method IsDefaultAttributeWhen 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 MatchWhen overridden in a derived class, returns a value that indicates whether this instance equals a specified object. (Inherited from Attribute.)
Public method ToStringReturns a string that represents the current object. (Inherited from Object.)
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Explicit Interface Implementations
  NameDescription
Explicit interface implemetation Private method _AttributeGetIDsOfNamesMaps a set of names to a corresponding set of dispatch identifiers. (Inherited from Attribute.)
Explicit interface implemetation Private method _AttributeGetTypeInfoRetrieves 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 _AttributeGetTypeInfoCountRetrieves the number of type information interfaces that an object provides (either 0 or 1). (Inherited from Attribute.)
Explicit interface implemetation Private method _AttributeInvokeProvides access to properties and methods exposed by an object. (Inherited from Attribute.)
Explicit interface implemetation Private method IContractBehaviorAddBindingParametersImplements the AddBindingParameters method to attach binding parameters correctly.
Explicit interface implemetation Private method IContractBehaviorApplyClientBehaviorImplementation of the ApplyClientBehavior method for client support.
Explicit interface implemetation Private method IContractBehaviorApplyDispatchBehaviorImplementation of the IContractBehaviorApplyDispatchBehavior method that enables service support.
Explicit interface implemetation Private method IContractBehaviorValidateImplements the Validate method to enable validation support.
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Remarks

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.

Examples
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
using System;
using System.ServiceModel;

[ServiceContract]
interface ICalculatorService
{
  [OperationBehavior()]
  int Add(int a, int b);  

  [OperationContract]
  int Subtract(int a, int b);
}

[DeliveryRequirementsAttribute(
  QueuedDeliveryRequirements=QueuedDeliveryRequirementsMode.NotAllowed,
  RequireOrderedDelivery=true
)]
class CalculatorService: ICalculatorService
{
  public int Add(int a, int b)
  {
    Console.WriteLine("Add called.");
    return a + b; 
  }

  public int Subtract(int a, int b)
  {
    Console.WriteLine("Subtract called.");
    return a - b;
  }

  public int Multiply(int a, int b)
  {
    return a * b;
  }
}
Version Information

.NET Framework

Supported in: 4.5, 4, 3.5, 3.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1
Platforms

Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

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

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.