Azure API認証

GetAzureDataMarketToken.cs

        /// <summary>
        /// OAuth認証を実行する
        /// </summary>
        /// <returns></returns>
        private async Task<string> GetAzureDataMarketToken()
        {
            var properties = new Dictionary<string, string>
            {
                { "grant_type", "client_credentials" },
                { "client_id",  _clientId},
                { "client_secret", _clientSecret },
                { "scope", "http://api.microsofttranslator.com" }
            };

            using (var req = new HttpClient())
            {
                var DataMarketAddress = new Uri("https://datamarket.accesscontrol.windows.net/v2/OAuth2-13");
                var authentication = new FormUrlEncodedContent(properties);
                var res = await req.PostAsync(DataMarketAddress, authentication);
                using (Stream stream = await res.Content.ReadAsStreamAsync())
                {
                    var serializer = new DataContractJsonSerializer(typeof(AdmAccessToken));
                    AdmAccessToken token = (AdmAccessToken)serializer.ReadObject(await res.Content.ReadAsStreamAsync());
                    return token.access_token;
                }
            }
        }
    }

    public class AdmAccessToken
    {
        public string access_token { get; set; }
        public string token_type { get; set; }
        public string expires_in { get; set; }
        public string scope { get; set; }
    }