How to set ServiceHostingEnvironment.AspNetCompatibilityEnabled = true in Code (not in config) .NET/C#

Question

I have a requirement to access the HttpContext.Current from with-in a RESTful WCF service. I know I am able to achieve this by adding the following to config:

<serviceHostingEnvironment aspNetCompatibilityEnabled=”true” />

and using the following attribute on my service:

[AspNetCompatibilityRequirements(RequirementsMode 
    = AspNetCompatibilityRequirementsMode.Required)]

Here is my issue, I need to "spin up" an instance of the service in code for unit testing and therefore I cannot use config files to specify service bebaviours etc. At the moment my code looks like follows, but despite scouring the web I have been unable to work out how I set up a ServiceHostingEnvironment class and set the AspNetCompatibilityEnabled property to true without using config, can anyone help?

string serviceUrl = "http://localhost:8082/MyService.svc";

_host = new ServiceHost(typeof(MyService), new Uri[] { new Uri(serviceUrl) });

ServiceEndpoint serviceEndpoint 
    = _host.AddServiceEndpoint(typeof(IMyService), new WebHttpBinding(), string.Empty);

serviceEndpoint.Behaviors.Add(new WebHttpBehavior());

// Here's where I'm stuck, i need something like...
ServiceHostingEnvironmentSection shes = new ServiceHostingEnvironmentSection();
shes.AspNetCompatibilityEnabled = true;
_host.Add(shes);

_host.Open();

Any help is much appreciated and thanks in advance.

Answer 1

You can totally do this, I don't know what these other answers are about, but they are way off!

Just do something like:

_host = new ServiceHost(...);
// Remove existing behavior as it is readOnly
for (int i = 0; i < _host.Description.Behaviors.Count; i++)
{
    if (_host.Description.Behaviors[i] is AspNetCompatibilityRequirementsAttribute)
    {
      _host.Description.Behaviors.RemoveAt(i);
      break;
    }
}
// Replace behavior with one that is configured the way you desire.
_host.Description.Behaviors.Add(new AspNetCompatibilityRequirementsAttribute { RequirementsMode = AspNetCompatibilityRequirementsMode.Allowed });
_host.Open();

-- Edit This removes the existing behavior if it exists, and then adds a new behavior that has the mode you prefer. My example sets it to .Allowed, but you could of course set it to the mode you desire.

Answer 2

After digging around with Reflector, I was able to set the AspNetCompatibilityEnabled flag using reflection. This approach has obvious drawbacks, but it did the job for me:

        // get the ServiceHostingEnvironmentSection by calling an internal static method
        var section = (ServiceHostingEnvironmentSection)typeof(ServiceHostingEnvironmentSection).GetMethod("UnsafeGetSection", System.Reflection.BindingFlags.NonPublic | System.Reflection.BindingFlags.Static).Invoke(null, null);
        // set the read-only flag to false so values can be updated
        typeof(ServiceHostingEnvironmentSection).BaseType.BaseType.GetField("_bReadOnly", System.Reflection.BindingFlags.Instance | System.Reflection.BindingFlags.NonPublic).SetValue(section, false);
        // set the AspNetCompatibilityEnabled value
        section.AspNetCompatibilityEnabled = true;

        // now one can add a Service Route
        routes.Add(new ServiceRoute("MyRoutePrefix", new ServiceHostFactory(), typeof(MyService)));