如何获取或创建令牌

Question

我正在尝试使用web-api进行令牌教程而且我有点混淆，我无法知道如何获取我的令牌，根据教程，令牌来自Web Api的端点，但我不明白产生令牌的具体功能是什么或如何调用它所以我会得到一个令牌回到GetToken()，这里有一些代码：

class Startup

public void ConfigureAuth(IAppBuilder app)
        {                                    
            app.UseCookieAuthentication(new CookieAuthenticationOptions());            app.UseExternalSignInCookie(DefaultAuthenticationTypes.ExternalCookie);         
            string PublicClientId = "self";
            OAuthAuthorizationServerOptions OAuthOptions = new OAuthAuthorizationServerOptions
            {
                TokenEndpointPath = new PathString("/Token"),
                Provider = new   PureApi.Provider.ApplicationOAuthProvider(PublicClientId),
                AuthorizeEndpointPath = new PathString("/api/Login"),
                AccessTokenExpireTimeSpan = TimeSpan.FromDays(14),
                AllowInsecureHttp = true
            };             
            app.UseOAuthBearerTokens(OAuthOptions);                                    
        }

我的LoginController

static string GetToken(string userName, string password)
        {                var pairs = new List<KeyValuePair<string, string>>                                  
        {new KeyValuePair<string, string>( "grant_type", "password" ), 
         new KeyValuePair<string, string>( "username",userName ), 
         new KeyValuePair<string, string> ( "Password", password ) };
            var content = new FormUrlEncodedContent(pairs);
            using (var client = new HttpClient())
            {
                var response =                 client.PostAsync("http://localhost:2188/api/Test",content).Result;
                return response.Content.ReadAsStringAsync().Result;
            }                                
        }

类提供程序

public override Task TokenEndpoint(OAuthTokenEndpointContext context)
        { foreach (KeyValuePair<string, string> property in          context.Properties.Dictionary)
  { context.AdditionalResponseParameters.Add(property.Key,property.Value);
            }
            return Task.FromResult<object>(null);
        }