DeliveryRequirementsAttribute Class


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

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


[AttributeUsageAttribute(AttributeTargets.Class | AttributeTargets.Interface, 
	AllowMultiple = true)]
public sealed class DeliveryRequirementsAttribute : Attribute, 
	IContractBehavior, IContractBehaviorAttribute


Initializes a new instance of the DeliveryRequirementsAttribute class.


Specifies whether the binding for a service must support queued contracts.


Specifies whether the binding must support ordered messages.


Gets or sets the type to which it applies.


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


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.)


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


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


When overridden in a derived class, indicates whether the value of this instance is the default value for the derived class.(Inherited from Attribute.)


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


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

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.)


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.)

System_CAPS_pubinterfaceSystem_CAPS_privmethodIContractBehavior.AddBindingParameters(ContractDescription, ServiceEndpoint, BindingParameterCollection)

Implements the IContractBehavior.AddBindingParameters method to attach binding parameters correctly.

System_CAPS_pubinterfaceSystem_CAPS_privmethodIContractBehavior.ApplyClientBehavior(ContractDescription, ServiceEndpoint, ClientRuntime)

Implementation of the IContractBehavior.ApplyClientBehavior method for client support.

System_CAPS_pubinterfaceSystem_CAPS_privmethodIContractBehavior.ApplyDispatchBehavior(ContractDescription, ServiceEndpoint, DispatchRuntime)

Implementation of the IContractBehavior.ApplyDispatchBehavior method that enables service support.

System_CAPS_pubinterfaceSystem_CAPS_privmethodIContractBehavior.Validate(ContractDescription, ServiceEndpoint)

Implements the IContractBehavior.Validate method to enable validation support.

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.

using System;
using System.ServiceModel;

interface ICalculatorService
  int Add(int a, int b);  

  int Subtract(int a, int b);

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;

.NET Framework
Available since 3.0

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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