在Web.config中添加工作流扩展

在部署到IIS或AppFabric时,如何在Web.config中配置自定义工作流扩展(例如PersistenceParticipant后代)？(对于WF 4)

You can do so in the CacheMetadata of an activity or through a service behavior as follows.

Create an IServiceBehavior to add the extension and a BehaviorExtensionElement to load the IServiceBehavior.

public class MyExtensionElement : BehaviorExtensionElement
{
    public override Type BehaviorType
    {
        get 
        { 
            return typeof(MyExtensionBehavior); 
        }
    }
    protected override object CreateBehavior()
    {
        return new MyExtensionBehavior();
    }
}

public class MyExtensionBehavior : IServiceBehavior
    {
    public void ApplyDispatchBehavior(ServiceDescription serviceDescription, ServiceHostBase serviceHostBase)
    {
        var host = (WorkflowServiceHost)serviceHostBase;
        host.WorkflowExtensions.Add(() => new MyExtension());
    }
}

Next register it as an behaviorExtensions in the config and use in in your service behavior