微软文档地址https://docs.microsoft.com/zh-cn/dotnet/api/system.net.http.httpclient?view=netframework-4.7.2，只有get。post 的方法找了白天才解决

using System; using System.Collections.Generic; using System.Threading; using System.Threading.Tasks; using MySql.Data.MySqlClient; using System.Timers; using Newtonsoft.Json; using System.Net.Http; using System.IO; using System.Net; public class user { public string password;//密码hash public string account;//账户 } static async void TaskAsync() { using (var client = new HttpClient()) { try { //序列化 user user = new user(); user.account = "zanllp"; user.password = "zanllp_pw"; var str = JsonConvert.SerializeObject(user); HttpContent content =new StringContent(str); content.Headers.ContentType = new System.Net.Http.Headers.MediaTypeHeaderValue("application/json"); HttpResponseMessage response = await client.PostAsync("http://255.255.255.254:5000/api/auth", content);//改成自己的 response.EnsureSuccessStatusCode();//用来抛异常的 string responseBody = await response.Content.ReadAsStringAsync(); Console.WriteLine(responseBody); } catch (Exception e) { Console.WriteLine("\nException Caught!"); Console.WriteLine("Message :{0} ", e.Message); } } using (HttpClient client = new HttpClient()) { try { HttpResponseMessage response = await client.GetAsync("http://255.255.255.254:5000/api/auth"); response.EnsureSuccessStatusCode();//用来抛异常的 string responseBody = await response.Content.ReadAsStringAsync(); Console.WriteLine(responseBody); } catch (HttpRequestException e) { Console.WriteLine("\nException Caught!"); Console.WriteLine("Message :{0} ", e.Message); } } } static void Main(string[] args) { TaskAsync(); Console.ReadKey(); }

在阿里云上的.Net Core on Linux

using ICSharpCode.SharpZipLib.GZip; using Newtonsoft.Json; using System; using System.Collections.Generic; using System.IO; using System.Net; using System.Net.Http; using System.Net.Http.Headers; using System.Threading.Tasks; /// <summary> /// 基于HttpClient封装的请求类 /// </summary> public class HttpRequest { /// <summary> /// 使用post方法异步请求 /// </summary> /// <param>目标链接</param> /// <param>发送的参数字符串，，只能用json</param> /// <returns>返回的字符串</returns> public static async Task<string> PostAsyncJson(string url, string json) { HttpClient client = new HttpClient(); HttpContent content = new StringContent(json); content.Headers.ContentType = new System.Net.Http.Headers.MediaTypeHeaderValue("application/json"); HttpResponseMessage response = await client.PostAsync(url, content); response.EnsureSuccessStatusCode(); string responseBody = await response.Content.ReadAsStringAsync(); return responseBody; } /// <summary> /// 使用post方法异步请求 /// </summary> /// <param>目标链接</param> /// <param>发送的参数字符串</param> /// <returns>返回的字符串</returns> public static async Task<string> PostAsync(string url, string data, Dictionary<string, string> header = null, bool Gzip = false) { HttpClient client = new HttpClient(new HttpClientHandler() { UseCookies = false }); HttpContent content = new StringContent(data); if (header != null) { client.DefaultRequestHeaders.Clear(); foreach (var item in header) { client.DefaultRequestHeaders.Add(item.Key, item.Value); } } HttpResponseMessage response = await client.PostAsync(url, content); response.EnsureSuccessStatusCode(); string responseBody = ""; if (Gzip) { GZipInputStream inputStream = new GZipInputStream(await response.Content.ReadAsStreamAsync()); responseBody = new StreamReader(inputStream).ReadToEnd(); } else { responseBody = await response.Content.ReadAsStringAsync(); } return responseBody; } /// <summary> /// 使用get方法异步请求 /// </summary> /// <param>目标链接</param> /// <returns>返回的字符串</returns> public static async Task<string> GetAsync(string url, Dictionary<string, string> header = null, bool Gzip = false) { HttpClient client = new HttpClient(new HttpClientHandler() { UseCookies = false }); if (header != null) { client.DefaultRequestHeaders.Clear(); foreach (var item in header) { client.DefaultRequestHeaders.Add(item.Key, item.Value); } } HttpResponseMessage response = await client.GetAsync(url); response.EnsureSuccessStatusCode();//用来抛异常的 string responseBody = ""; if (Gzip) { GZipInputStream inputStream = new GZipInputStream(await response.Content.ReadAsStreamAsync()); responseBody = new StreamReader(inputStream).ReadToEnd(); } else { responseBody = await response.Content.ReadAsStringAsync(); } return responseBody; } /// <summary> /// 使用post返回异步请求直接返回对象 /// </summary> /// <typeparam>返回对象类型</typeparam> /// <typeparam>请求对象类型</typeparam> /// <param>请求链接</param> /// <param>请求对象数据</param> /// <returns>请求返回的目标对象</returns> public static async Task<T> PostObjectAsync<T, T2>(string url, T2 obj) { String json = JsonConvert.SerializeObject(obj); string responseBody = await PostAsyncJson(url, json); //请求当前账户的信息 return JsonConvert.DeserializeObject<T>(responseBody);//把收到的字符串序列化 } /// <summary> /// 使用Get返回异步请求直接返回对象 /// </summary> /// <typeparam>请求对象类型</typeparam> /// <param>请求链接</param> /// <returns>返回请求的对象</returns> public static async Task<T> GetObjectAsync<T>(string url) { string responseBody = await GetAsync(url); //请求当前账户的信息 return JsonConvert.DeserializeObject<T>(responseBody);//把收到的字符串序列化 } }

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原文地址：https://www.cnblogs.com/guohu/p/12982850.html