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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)

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

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;


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