IBindingDeliveryCapabilities Interface


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Defines the interface that bindings must implement to describe and advertise the capabilities that clients and services may require.

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

public interface IBindingDeliveryCapabilities


Gets a value that indicates whether the binding can support assurances for the delivery of messages in the order they were sent.


Gets a value that indicates whether the binding can support the queued delivery of messages.

The IBindingDeliveryCapabilities interface must be implemented by a binding if clients and services are to be able to stipulate, as part of their contract, that the features they require are provided by the binding.

The following sample requires that CalculatorService must use a WSHttpBinding with ordered message delivery. Reliable sessions and queued delivery are not used by default with this binding, but can be enabled.

<!-- Here is the configuration for a CalculatorService using a WSHttpBinding with ordered message delivery required. -->
<?xml version="1.0" encoding="utf-8" ?>
            <!-- Use base address provided by host and a WSHttpBinding named "Binding1" -->
            <endpoint address=""
                      contract="Microsoft.ServiceModel.Samples.ICalculator" />

            <binding name="Binding1">         
               <!-- The next element enables a ReliableSession and required ordered delivery-->
      <reliableSession enabled="true" ordered="true"/>


// The CalculatorService configuration has enabled a reliable session
// with ordered delivery set to true. This means that the binding
// requirement for ordered delivery specified by the
// BindingRequirementsAttribute on the CalculatorService class
// implemented below will be satisfied by this WSHttpBinding.

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
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