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DeliveryRequirementsAttribute.TargetContract Property

Gets or sets the type to which it applies.

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

public Type TargetContract { get; set; }

Property Value

Type: System.Type
The Type to which the attribute applies.



A service class can implement any number of service contract interfaces. Use the TargetContract property to validate that endpoints with the TargetContract have bindings that support the requirements. This attribute can be used any number of times on the same class.

The following code example uses the DeliveryRequirementsAttribute attribute to instruct WCF to confirm at runtime that the actual binding does not support queued contracts but does support ordered messages. It also specifies the target contract to which this restriction should be applied.

using System;
using System.ServiceModel;

interface ICalculatorService
    [OperationBehavior(TransactionAutoComplete = true)]
    int Add(int a, int b);

    int Subtract(int a, int b);

  QueuedDeliveryRequirements = QueuedDeliveryRequirementsMode.NotAllowed,
  RequireOrderedDelivery = true,
  TargetContract= typeof(ICalculatorService)
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;

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