public class SwaggerVersionHelper
    {
        public static bool ResolveVersionSupportByRouteConstraint(ApiDescription apiDesc, string targetApiVersion)
        {

            var attr = apiDesc.ActionDescriptor.ControllerDescriptor.GetCustomAttributes<VersionedRoute>().FirstOrDefault();
            if (attr == null)
            {
                if (targetApiVersion == "manage")
                {
                    return true;
                }
                else
                {
                    return false;
                }
            }


            
                int targetVersion;
                targetApiVersion = targetApiVersion.TrimStart(‘v‘);

                if (attr.Version != 0 && int.TryParse(targetApiVersion, out targetVersion))
                {
                    return attr.Version == targetVersion;
                };

                return false;
         }
    }    

[AttributeUsage(AttributeTargets.All)]
public class VersionedRoute : Attribute
{
public VersionedRoute(string name, int version)
{
Name = name;
Version = version;
}
 
public string Name { get; set; }
public int Version { get; set; }
}

public class NamespaceHttpControllerSelector : AbpHttpControllerSelector, ISingletonDependency
{
private const string NamespaceKey = "namespace";
private const string ControllerKey = "controller";
 
private readonly HttpConfiguration _configuration;
private readonly Lazy<Dictionary<string, HttpControllerDescriptor>> _controllers;
private readonly HashSet<string> _duplicates;
 
public NamespaceHttpControllerSelector(HttpConfiguration config, DynamicApiControllerManager dynamicApiControllerManager)
: base(config, dynamicApiControllerManager)
{
_configuration = config;
_duplicates = new HashSet<string>(StringComparer.OrdinalIgnoreCase);
_controllers = new Lazy<Dictionary<string, HttpControllerDescriptor>>(InitializeControllerDictionary);
}
 
private Dictionary<string, HttpControllerDescriptor> InitializeControllerDictionary()
{
var dictionary = new Dictionary<string, HttpControllerDescriptor>(StringComparer.OrdinalIgnoreCase);
 
// Create a lookup table where key is "namespace.controller". The value of "namespace" is the last
// segment of the full namespace. For example:
// MyApplication.Controllers.V1.ProductsController => "V1.Products"
IAssembliesResolver assembliesResolver = _configuration.Services.GetAssembliesResolver();
IHttpControllerTypeResolver controllersResolver = _configuration.Services.GetHttpControllerTypeResolver();
 
ICollection<Type> controllerTypes = controllersResolver.GetControllerTypes(assembliesResolver);
 
foreach (Type t in controllerTypes)
{
var segments = t.Namespace.Split(Type.Delimiter);
 
// For the dictionary key, strip "Controller" from the end of the type name.
// This matches the behavior of DefaultHttpControllerSelector.
var controllerName = t.Name.Remove(t.Name.Length - DefaultHttpControllerSelector.ControllerSuffix.Length);
 
var spacename = segments[segments.Length - 1];
if (new Regex("v\\d+").IsMatch(spacename))
{
var key = String.Format(CultureInfo.InvariantCulture, "{0}.{1}", segments[segments.Length - 1], controllerName);
 
// Check for duplicate keys.
if (dictionary.Keys.Contains(key))
{
_duplicates.Add(key);
}
else
{
dictionary[key] = new HttpControllerDescriptor(_configuration, t.Name, t);
}
}
else
{
dictionary[controllerName] = new HttpControllerDescriptor(_configuration, t.Name, t);
}
}
 
// Remove any duplicates from the dictionary, because these create ambiguous matches.
// For example, "Foo.V1.ProductsController" and "Bar.V1.ProductsController" both map to "v1.products".
foreach (string s in _duplicates)
{
dictionary.Remove(s);
}
return dictionary;
}
 
// Get a value from the route data, if present.
private static T GetRouteVariable<T>(IHttpRouteData routeData, string name)
{
object result = null;
if (routeData.Values.TryGetValue(name, out result))
{
return (T)result;
}
return default(T);
}
 
public override HttpControllerDescriptor SelectController(HttpRequestMessage request)
{
IHttpRouteData routeData = request.GetRouteData();
if (routeData =http://www.mamicode.com/= null)
{
throw new HttpResponseException(HttpStatusCode.NotFound);
}
 
// Get the namespace and controller variables from the route data.
string namespaceName = GetRouteVariable<string>(routeData, NamespaceKey);
if (namespaceName == null)
{
return base.SelectController(request);
}
 
string controllerName = GetRouteVariable<string>(routeData, ControllerKey);
if (controllerName == null)
{
return base.SelectController(request);
}
 
 
if (!new Regex("v\\d+").IsMatch(namespaceName))
{
return base.SelectController(request);
}
 
// Find a matching controller.
string key = String.Format(CultureInfo.InvariantCulture, "{0}.{1}", namespaceName, controllerName);
 
HttpControllerDescriptor controllerDescriptor;
if (_controllers.Value.TryGetValue(key, out controllerDescriptor))
{
return controllerDescriptor;
}
else if (_duplicates.Contains(key))
{
throw new HttpResponseException(
request.CreateErrorResponse(HttpStatusCode.InternalServerError,
"Multiple controllers were found that match this request."));
}
else
{
throw new HttpResponseException(HttpStatusCode.NotFound);
}
}
 
public override IDictionary<string, HttpControllerDescriptor> GetControllerMapping()
{
return _controllers.Value;
}
 
public void UseThis()
{
_configuration.Services.Replace(typeof(IHttpControllerSelector), this);
}
}