1 public abstract class ApiController : IHttpController, IDisposable
 2 {
 3     // Fields
 4     private HttpConfiguration _configuration;
 5     private HttpControllerContext _controllerContext;
 6     private bool _disposed;
 7     private ModelStateDictionary _modelState;
 8     private HttpRequestMessage _request;
 9     private UrlHelper _urlHelper;
10 
11     // Methods
12     protected ApiController();
13     public void Dispose();
14     protected virtual void Dispose(bool disposing);
15     public virtual Task<HttpResponseMessage> ExecuteAsync(HttpControllerContext controllerContext, CancellationToken cancellationToken);
16 }

 1 public virtual Task<HttpResponseMessage> ExecuteAsync(HttpControllerContext controllerContext, CancellationToken cancellationToken)
 2 {
 3     if (this._request != null)
 4     {
 5         throw Error.InvalidOperation(SRResources.CannotSupportSingletonInstance, new object[] { typeof(ApiController).Name, typeof(IHttpControllerActivator).Name });
 6     }
 7     this.Initialize(controllerContext);
 8     if (this._request != null)
 9     {
10         this._request.RegisterForDispose(this);
11     }
12     HttpControllerDescriptor controllerDescriptor = controllerContext.ControllerDescriptor;
13     ServicesContainer controllerServices = controllerDescriptor.Configuration.Services;
14     HttpActionDescriptor actionDescriptor = controllerServices.GetActionSelector().SelectAction(controllerContext);
15     HttpActionContext actionContext = new HttpActionContext(controllerContext, actionDescriptor);
16 }

 1 public class ApiControllerActionSelector : IHttpActionSelector
 2 {
 3     // Fields
 4     private readonly object _cacheKey;
 5     private ActionSelectorCacheItem _fastCache;
 6     private const string ActionRouteKey = "action";
 7     private const string ControllerRouteKey = "controller";
 8 
 9     // Methods
10     public ApiControllerActionSelector();
11     public virtual ILookup<string, HttpActionDescriptor> GetActionMapping(HttpControllerDescriptor controllerDescriptor);
12     private ActionSelectorCacheItem GetInternalSelector(HttpControllerDescriptor controllerDescriptor);
13     public virtual HttpActionDescriptor SelectAction(HttpControllerContext controllerContext);
14 
15     // Nested Types
16     private class ActionSelectorCacheItem
17     {
18         // Fields
19         private readonly ReflectedHttpActionDescriptor[] _actionDescriptors;
20         private readonly ILookup<string, ReflectedHttpActionDescriptor> _actionNameMapping;
21         private readonly IDictionary<ReflectedHttpActionDescriptor, string[]> _actionParameterNames;
22         private readonly HttpMethod[] _cacheListVerbKinds;
23         private readonly ReflectedHttpActionDescriptor[][] _cacheListVerbs;
24         private readonly HttpControllerDescriptor _controllerDescriptor;
25 
26         // Methods
27         public ActionSelectorCacheItem(HttpControllerDescriptor controllerDescriptor);
28         private static string CreateAmbiguousMatchList(IEnumerable<HttpActionDescriptor> ambiguousDescriptors);
29         private ReflectedHttpActionDescriptor[] FindActionsForVerb(HttpMethod verb);
30         private ReflectedHttpActionDescriptor[] FindActionsForVerbWorker(HttpMethod verb);
31         private IEnumerable<ReflectedHttpActionDescriptor> FindActionUsingRouteAndQueryParameters(HttpControllerContext controllerContext, IEnumerable<ReflectedHttpActionDescriptor> actionsFound, bool hasActionRouteKey);
32         public ILookup<string, HttpActionDescriptor> GetActionMapping();
33         private static bool IsSubset(string[] actionParameters, HashSet<string> routeAndQueryParameters);
34         private static bool IsValidActionMethod(MethodInfo methodInfo);
35         private static List<ReflectedHttpActionDescriptor> RunSelectionFilters(HttpControllerContext controllerContext, IEnumerable<HttpActionDescriptor> descriptorsFound);
36         public HttpActionDescriptor SelectAction(HttpControllerContext controllerContext);
37 
38         // Properties
39         public HttpControllerDescriptor HttpControllerDescriptor { get; }
40     }
41 
42     private class LookupAdapter : ILookup<string, HttpActionDescriptor>, IEnumerable<IGrouping<string, HttpActionDescriptor>>, IEnumerable
43     {
44         // Fields
45         public ILookup<string, ReflectedHttpActionDescriptor> Source;
46 
47         // Methods
48         public LookupAdapter();
49         public bool Contains(string key);
50         public IEnumerator<IGrouping<string, HttpActionDescriptor>> GetEnumerator();
51         IEnumerator IEnumerable.GetEnumerator();
52 
53         // Properties
54         public int Count { get; }
55         public IEnumerable<HttpActionDescriptor> this[string key] { get; }
56     }
57 }

 1 private class ActionSelectorCacheItem
 2 {
 3     // Fields
 4     private readonly ReflectedHttpActionDescriptor[] _actionDescriptors;
 5     private readonly ILookup<string, ReflectedHttpActionDescriptor> _actionNameMapping;
 6     private readonly IDictionary<ReflectedHttpActionDescriptor, string[]> _actionParameterNames;
 7     private readonly HttpMethod[] _cacheListVerbKinds;
 8     private readonly ReflectedHttpActionDescriptor[][] _cacheListVerbs;
 9     private readonly HttpControllerDescriptor _controllerDescriptor;
10 
11     // Methods
12     public ActionSelectorCacheItem(HttpControllerDescriptor controllerDescriptor);
13     public HttpActionDescriptor SelectAction(HttpControllerContext controllerContext);
14 
15     // Properties
16     public HttpControllerDescriptor HttpControllerDescriptor { get; }
17 }

public ActionSelectorCacheItem(HttpControllerDescriptor controllerDescriptor)
{
    this._actionParameterNames = new Dictionary<ReflectedHttpActionDescriptor, string[]>();
    this._cacheListVerbKinds = new HttpMethod[] { HttpMethod.Get, HttpMethod.Put, HttpMethod.Post };
    this._controllerDescriptor = controllerDescriptor;
    MethodInfo[] infoArray2 = Array.FindAll<MethodInfo>(this._controllerDescriptor.ControllerType.GetMethods(BindingFlags.Public | BindingFlags.Instance), new Predicate<MethodInfo>(ApiControllerActionSelector.ActionSelectorCacheItem.IsValidActionMethod));
    this._actionDescriptors = new ReflectedHttpActionDescriptor[infoArray2.Length];
    for (int i = 0; i < infoArray2.Length; i++)
    {
        MethodInfo methodInfo = infoArray2[i];
        ReflectedHttpActionDescriptor key = new ReflectedHttpActionDescriptor(this._controllerDescriptor, methodInfo);
        this._actionDescriptors[i] = key;
        HttpActionBinding actionBinding = key.ActionBinding;
        this._actionParameterNames.Add(key, (from binding in actionBinding.ParameterBindings
            where (!binding.Descriptor.IsOptional && TypeHelper.IsSimpleUnderlyingType(binding.Descriptor.ParameterType)) && binding.WillReadUri()
            select binding.Descriptor.Prefix ?? binding.Descriptor.ParameterName).ToArray<string>());
    }
    this._actionNameMapping = this._actionDescriptors.ToLookup<ReflectedHttpActionDescriptor, string>(actionDesc => actionDesc.ActionName, StringComparer.OrdinalIgnoreCase);
    int length = this._cacheListVerbKinds.Length;
    this._cacheListVerbs = new ReflectedHttpActionDescriptor[length][];
    for (int j = 0; j < length; j++)
    {
        this._cacheListVerbs[j] = this.FindActionsForVerbWorker(this._cacheListVerbKinds[j]);
    }
}