C# WeChat Development Journey: Basic Class HttpClientHelper (Update: SSL Security Policy)

Contains methods for initiating get or post requests through HttpClient. All operations calling the WeChat interface go through this class. Without further ado, let’s go directly to the code:

2014-10-31 Code update: WeChat SSL security policy adjustment, turning off support for SSLv2 and SSLv3 versions, and no longer supporting some versions of SSLv2, SSLv3 or lower Client call.

public class HttpClientHelper
    {
        /// <summary>
        /// get请求
        /// </summary>
        /// <param name="url"></param>
        /// <returns></returns>
        public static string GetResponse(string url)
        {
            if (url.StartsWith("https"))
                System.Net.ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls;

            HttpClient httpClient = new HttpClient();
            httpClient.DefaultRequestHeaders.Accept.Add(
               new MediaTypeWithQualityHeaderValue("application/json"));
            HttpResponseMessage response = httpClient.GetAsync(url).Result;

            if (response.IsSuccessStatusCode)
            {
                string result = response.Content.ReadAsStringAsync().Result;
                return result;
            }
            return null;
        }

        public static T GetResponse<T>(string url)
            where T : class,new()
        {
            if (url.StartsWith("https"))
                System.Net.ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls;

            HttpClient httpClient = new HttpClient();
            httpClient.DefaultRequestHeaders.Accept.Add(
               new MediaTypeWithQualityHeaderValue("application/json"));
            HttpResponseMessage response = httpClient.GetAsync(url).Result;

            T result = default(T);

            if (response.IsSuccessStatusCode)
            {
                Task<string> t = response.Content.ReadAsStringAsync();
                string s = t.Result;

                result = JsonConvert.DeserializeObject<T>(s);
            }
            return result;
        }

        /// <summary>
        /// post请求
        /// </summary>
        /// <param name="url"></param>
        /// <param name="postData">post数据</param>
        /// <returns></returns>
        public static string PostResponse(string url, string postData)
        {
            if (url.StartsWith("https"))
                System.Net.ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls;

            HttpContent httpContent = new StringContent(postData);
            httpContent.Headers.ContentType = new MediaTypeHeaderValue("application/json");
            HttpClient httpClient = new HttpClient();

            HttpResponseMessage response = httpClient.PostAsync(url, httpContent).Result;

            if (response.IsSuccessStatusCode)
            {
                string result = response.Content.ReadAsStringAsync().Result;
                return result;
            }
            return null;
        }

        /// <summary>
        /// 发起post请求
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="url">url</param>
        /// <param name="postData">post数据</param>
        /// <returns></returns>
        public static T PostResponse<T>(string url, string postData)
            where T : class,new()
        {
            if (url.StartsWith("https"))
                System.Net.ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls;

            HttpContent httpContent = new StringContent(postData);
            httpContent.Headers.ContentType = new MediaTypeHeaderValue("application/json");
            HttpClient httpClient = new HttpClient();

            T result = default(T);

            HttpResponseMessage response = httpClient.PostAsync(url, httpContent).Result;

            if (response.IsSuccessStatusCode)
            {
                Task<string> t = response.Content.ReadAsStringAsync();
                string s = t.Result;

                result = JsonConvert.DeserializeObject<T>(s);
            }
            return result;
        }

        /// <summary>
        /// V3接口全部为Xml形式，故有此方法
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="url"></param>
        /// <param name="xmlString"></param>
        /// <returns></returns>
        public static T PostXmlResponse<T>(string url, string xmlString)
            where T : class,new()
        {
            if (url.StartsWith("https"))
                System.Net.ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls;

            HttpContent httpContent = new StringContent(xmlString);
            httpContent.Headers.ContentType = new MediaTypeHeaderValue("application/json");
            HttpClient httpClient = new HttpClient();

            T result = default(T);

            HttpResponseMessage response = httpClient.PostAsync(url, httpContent).Result;

            if (response.IsSuccessStatusCode)
            {
                Task<string> t = response.Content.ReadAsStringAsync();
                string s = t.Result;

                result = XmlDeserialize<T>(s);
            }
            return result;
        }

        /// <summary>
        /// 反序列化Xml
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="xmlString"></param>
        /// <returns></returns>
        public static T XmlDeserialize<T>(string xmlString) 
            where T : class,new ()
        {
            try
            {
                XmlSerializer ser = new XmlSerializer(typeof(T));
                using (StringReader reader = new StringReader(xmlString))
                {
                    return (T)ser.Deserialize(reader);
                }
            }
            catch (Exception ex)
            {
                throw new Exception("XmlDeserialize发生异常：xmlString:" + xmlString + "异常信息：" + ex.Message);
            }

        }
    }

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