public class HttpClientHelper{private static readonly HttpClient HttpClient;static HttpClientHelper(){HttpClient = new HttpClient();}/// <summary>/// Get 一个请求/// </summary>/// <param name="requestUri">请求URL</param>/// <returns></returns>public static string Get(string requestUri){var response = HttpClient.GetAsync(requestUri);return response.Result.Content.ReadAsStringAsync().Result;}/// <summary>/// Get 一个请求/// </summary>/// <param name="requestUri">请求URL</param>/// <param name="urlDictionary">请求参数</param>/// <returns></returns>public static string Get(string requestUri, Dictionary<string, string> urlDictionary){var paramter = urlDictionary.Aggregate(string.Empty,   (current, item) => current + (item.Key + "=" + item.Value + "&"));var response = HttpClient.GetAsync(requestUri + "?" + paramter.TrimEnd('&'));return response.Result.Content.ReadAsStringAsync().Result;}/// <summary>/// 异步 Get/// </summary>/// <param name="requestUri">请求URL</param>/// <returns></returns>public static async Task<string> GetAsync(string requestUri){var response = await HttpClient.GetAsync(requestUri);return await response.Content.ReadAsStringAsync();}/// <summary>/// Get 一个请求/// </summary>/// <param name="requestUri">请求URL</param>/// <param name="urlDictionary">请求参数</param>/// <returns></returns>public static async Task<string> GetAsync(string requestUri, Dictionary<string, string> urlDictionary){var paramter = urlDictionary.Aggregate(string.Empty,  (current, item) => current + (item.Key + "=" + item.Value + "&"));var response = await HttpClient.GetAsync(requestUri + "?" + paramter.TrimEnd('&'));if (response.StatusCode == System.Net.HttpStatusCode.OK){return await response.Content.ReadAsStringAsync();}return null;}/// <summary>/// Post 一个请求/// </summary>/// <param name="requestUri">请求URL</param>/// <param name="urlDictionary">请求参数</param>/// <returns></returns>public static string Post(string requestUri, Dictionary<string, string> urlDictionary){var paramter = new FormUrlEncodedContent(urlDictionary);var response = HttpClient.PostAsync(requestUri, paramter);return response.Result.Content.ReadAsStringAsync().Result;}/// <summary>/// 异步Post 一个请求/// </summary>/// <param name="requestUri">请求URL</param>/// <param name="urlDictionary">请求参数</param>/// <returns></returns>public static async Task<string> PostAsync(string requestUri, Dictionary<string, string> urlDictionary){var paramter = new FormUrlEncodedContent(urlDictionary);var response = await HttpClient.PostAsync(requestUri, paramter);return await response.Content.ReadAsStringAsync();}}