PolicyConversionContext.GetBindingAssertions Méthode

Définition

Espace de noms:

System.ServiceModel.Description

Assembly:

System.ServiceModel.dll

Obtient une collection d'assertions de stratégie à partir des métadonnées.

public:
 abstract System::ServiceModel::Description::PolicyAssertionCollection ^ GetBindingAssertions();

public abstract System.ServiceModel.Description.PolicyAssertionCollection GetBindingAssertions ();

abstract member GetBindingAssertions : unit -> System.ServiceModel.Description.PolicyAssertionCollection

Public MustOverride Function GetBindingAssertions () As PolicyAssertionCollection

Retours

PolicyAssertionCollection

ICollection<T> de type XmlElement qui contient des assertions de stratégie de liaisons.

Exemples

L'exemple de code suivant montre une implémentation de la méthode ImportPolicy qui écrit toutes les assertions de stratégie sur la console. Les commentaires de code décrivent comment rechercher une assertion de stratégie personnalisée spécifique, créer et insérer un élément de liaison d'implémentation et supprimer l'assertion de la collection.

public void ImportPolicy(MetadataImporter importer,
    PolicyConversionContext context)
{
    Console.WriteLine("The custom policy importer has been called.");
    foreach (XmlElement assertion in context.GetBindingAssertions())
    {
        Console.WriteLine(assertion.NamespaceURI + " : " + assertion.Name);
        // locate a particular assertion by Name and NamespaceURI
        XmlElement customAssertion = context.GetBindingAssertions().Find(name1, ns1);
        if (customAssertion != null)
        {
          // Found assertion; remove from collection.
          context.GetBindingAssertions().Remove(customAssertion);
          Console.WriteLine(
            "Removed our custom assertion from the imported "
            + "assertions collection and inserting our custom binding element."
          );
            // Here if you find the custom policy assertion that you are looking for,
            // add the custom binding element that handles the functionality that the policy indicates.
            // Attach it to the PolicyConversionContext.BindingElements collection.
            // For example, if the custom policy had a "speed" attribute value:
            /*
              string speed
                = customAssertion.GetAttribute(SpeedBindingElement.name2, SpeedBindingElement.ns2);
              SpeedBindingElement e = new SpeedBindingElement(speed);
              context.BindingElements.Add(e);
            */
        }

        // write assertion name in red.
        Console.ForegroundColor = ConsoleColor.Red;
        Console.WriteLine(assertion.NamespaceURI + " : " + assertion.Name);

        //write contents in gray.
        Console.WriteLine(assertion.OuterXml);
        Console.ForegroundColor = ConsoleColor.Gray;
    }
}

L'exemple de code suivant montre comment inscrire des implémentations IPolicyImportExtension à l'aide de la section de configuration <policyImporters>.

<configuration>
  <system.serviceModel>
    <client>
      <metadata>
        <policyImporters>
          <extension type="CustomPolicyImporter, assembly"/>
        </policyImporters>
      </metadata>
    </client>
  </system.serviceModel>
</configuration>

L'exemple de code suivant montre comment un élément de liaison personnalisé peut implémenter IPolicyExportExtension pour attacher une assertion de stratégie personnalisée aux assertions de liaison.

public class MyBindingElement : BindingElement, IPolicyExportExtension
{
// BindingElement implementation . . .

    public void ExportPolicy(
     MetadataExporter exporter, PolicyConversionContext context)
    {
        XmlDocument xmlDoc = new XmlDocument();
        XmlElement xmlElement =
               xmlDoc.CreateElement("MyPolicyAssertion");
        context.GetBindingAssertions().Add(xmlElement);
    }

    // Note: All custom binding elements must return a deep clone
    // to enable the run time to support multiple bindings using the
    // same custom binding.
    public override BindingElement Clone()
    {
        // this is just a placeholder
        return null;
    }

    // Call the inner property.
    public override T GetProperty<T>(BindingContext context)
    {
        return context.GetInnerProperty<T>();
    }
}

public class Program {
    public static void Main(string[] args) {
        EndpointAddress address =
            new EndpointAddress("http://localhost/metadata");
        CustomBinding customBinding =
            new CustomBinding(new BasicHttpBinding());
        customBinding.Elements.Add(new MyBindingElement());
        ContractDescription contract =
            ContractDescription.GetContract(typeof(MyContract));
        ServiceEndpoint endpoint =
            new ServiceEndpoint(contract, customBinding, address);
        MetadataExporter exporter = new WsdlExporter();
        exporter.ExportEndpoint(endpoint);
    }
}

Remarques

La collection retournée depuis GetBindingAssertions n'est pas une copie. Vous pouvez ajouter et supprimer autant d'assertions que nécessaire.