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包含通过HttpClient发起get或post请求的方法，所有调用微信接口的操作都通过此类。话不多说，直接上代码：

2014-10-31代码更新：微信SSL安全策略调整，关闭掉SSLv2、SSLv3版本支持，不再支持部分使用SSLv2、 SSLv3或更低版本的客户端调用。

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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