以下是类内的静态变量。用于管理状态及TOKEN信息，SESSION信息。

// 调用getAccessToken()获取的 access_token建议根据expires_in 时间 设置缓存
        // 返回token示例
        public static readonly String TOKEN = getAccessToken();

        public static bool IsFinishedThisUnit;
        private static string sessionId="";
        private static bool first=true;

下面是一段 c#调用百度API接口，获取临时token值。

public static string getAccessToken()
        {
            String clientId = 【这里填入APPID】;
            String clientSecret = 【这里填入APPSECRET】;
            String authHost = "https://aip.baidubce.com/oauth/2.0/token";
            HttpClient client = new HttpClient();
            List> paraList = new List>();
            paraList.Add(new KeyValuePair("grant_type", "client_credentials"));
            paraList.Add(new KeyValuePair("client_id", clientId));
            paraList.Add(new KeyValuePair("client_secret", clientSecret));

            HttpResponseMessage response = client.PostAsync(authHost, new FormUrlEncodedContent(paraList)).Result;
            String result = response.Content.ReadAsStringAsync().Result;
            //Console.WriteLine(result);
            JObject res = JObject.Parse(result);
            return res["access_token"].ToString();
        }

再根据TOKEN调用UNIT通用API接口获取返回json字符串并分析字符串指向的方法

public static JObject Unit_Send(string Content)
        {
            IsFinishedThisUnit = false;
            string host = "https://aip.baidubce.com/rpc/2.0/solution/v1/unit_utterance?access_token=" + TOKEN;
            HttpWebRequest request = (HttpWebRequest)WebRequest.Create(host);
            request.Method = "post";
            request.ContentType = "application/json";
            request.KeepAlive = true;
            string str = "{\"scene_id\":【这里填入UNIT场景ID】,\"query\":\"" + Content + "\", \"session_id\":\"" + sessionId + "\"}"; // json格式
            byte[] buffer = Encoding.UTF8.GetBytes(str);
            request.ContentLength = buffer.Length;
            request.GetRequestStream().Write(buffer, 0, buffer.Length);
            HttpWebResponse response = (HttpWebResponse)request.GetResponse();
            StreamReader reader = new StreamReader(response.GetResponseStream(), Encoding.UTF8);
            JObject res = JObject.Parse(reader.ReadToEnd());
            if (res["error_code"] == null)
            {
                sessionId = res["result"]["session_id"].ToString();
                if (res["result"]["action_list"][0]["action_type"]["act_type"].ToString() == "satisfy")
                {
                    //意图完成
                    IsFinishedThisUnit = true;
                    return res;
                }
                else if (res["result"]["action_list"][0]["action_type"]["act_type"].ToString() == "clarify")
                {
                    //意图未完成
                    Console.Write(res["result"]["action_list"][0]["say"].ToString());
                    return null;
                }
                else
                {
                    //未知意图 可加本地日志记录逻辑 以后期扩充样本集
                    Console.Write("你到底想干嘛？");
                    return null;
                }
            }
            else
            {
                return null;
            }
        }
    }