asp.net权限认证：OWIN实现OAuth 2.0 之密码模式（Resource Owner Password Credential）

　　　　static void Main(string[] args)
        {
            const string url = "http://localhost:8270/";
            var client = new HttpClient();

            var clientId = "123456";
            var clientSecret = "abcdef";
            client.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue(
                "Basic", Convert.ToBase64String(Encoding.ASCII.GetBytes(clientId + ":" + clientSecret)));

            // 密码模式
            var parameters = new Dictionary<string, string>();
            parameters.Add("grant_type", "password");
            parameters.Add("UserName", "UserName");
            parameters.Add("Password", "Password");

            // 提交
            var result = client.PostAsync(url + "OAuth/Token", new FormUrlEncodedContent(parameters)).Result.Content.ReadAsStringAsync().Result;
            var entity = JsonConvert.DeserializeObject<Token>(result);
            Console.WriteLine("Token: {0}", entity.AccessToken);

            client.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Bearer", entity.AccessToken);
            var result2 = client.GetAsync("http://localhost:8001/api/Values").Result.Content.ReadAsStringAsync().Result;
            Console.WriteLine("Result: {0}", result2);

            Console.ReadKey();
        }