C#中HttpClient进行各种类型的传输

我们可以看到, 尽管PostAsync有四个重载函数, 但是接受的都是HttpContent, 而查看源码可以看到, HttpContent是一个抽象类

那我们就不可能直接创建HttpContent的实例, 而需要去找他的实现类, 经过一番研究, 发现了, 如下四个:

MultipartFormDataContent、FormUrlEncodedContent、StringContent、StreamContent

和上面的总结进行一个对比就能发现端倪:

MultipartFormDataContent=》multipart/form-data

FormUrlEncodedContent=》application/x-www-form-urlencoded

StringContent=》application/json等

StreamContent=》binary

而和上面总结的一样FormUrlEncodedContent只是一个特殊的StringContent罢了, 唯一不同的就是在mediaType之前自己手动进行一下URL编码罢了(这一条纯属猜测, 逻辑上应该是没有问题的).

c# 使用HttpClient的post,get方法传输json

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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hashpublic 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自己封装的类，我几乎所有的个人项目都用这个
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;/// 

/// 基于HttpClient封装的请求类
/// 
public class HttpRequest
{/// 
/// 使用post方法异步请求/// 
/// 目标链接/// 发送的参数字符串，只能用json/// 返回的字符串public static async Task 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;}/// 
/// 使用post方法异步请求/// 
/// 目标链接/// 发送的参数字符串/// 返回的字符串public static async Task PostAsync(string url, string data, Dictionary 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;}/// 
/// 使用get方法异步请求/// 
/// 目标链接/// 返回的字符串public static async Task GetAsync(string url, Dictionary 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;}/// 
/// 使用post返回异步请求直接返回对象/// 
/// 返回对象类型/// 请求对象类型/// 请求链接/// 请求对象数据/// 请求返回的目标对象public static async Task PostObjectAsync(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(responseBody);//把收到的字符串序列化}/// 
/// 使用Get返回异步请求直接返回对象/// 
/// 请求对象类型/// 请求链接/// 返回请求的对象public static async Task GetObjectAsync(string url){string responseBody = await GetAsync(url); //请求当前账户的信息return JsonConvert.DeserializeObject(responseBody);//把收到的字符串序列化}
}
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版权声明：本文为CSDN博主「luckyone906」的原创文章，遵循CC 4.0 BY-SA版权协议，转载请附上原文出处链接及本声明。
原文链接：https://blog.csdn.net/u011555996/article/details/116721769

C# 使用 HttpClient 进行http GET/POST请求

using System;
using System.Collections.Generic;
using System.IO;
using System.Net.Http;
using System.Threading.Tasks;
namespace HTTPRequest
{class Program{static void Main(string[] args){HttpClient httpClient = new HttpClient();Task task0= httpClient.GetByteArrayAsync("http://127.0.0.1");task0.Wait();// while (!task0.IsCompletedSuccessfully) { };byte[] bresult=task0.Result;string sresult = System.Text.Encoding.Default.GetString(bresult);Console.WriteLine(sresult);//  Console.ReadLine();-------HttpClient httpClient0 = new HttpClient();List> param = new List>();param.Add(new KeyValuePair("xx", "xx"));Task responseMessage  =httpClient0.PostAsync("http://localhost:1083/Home/Test", new FormUrlEncodedContent(param));responseMessage.Wait();Task reString= responseMessage.Result.Content.ReadAsStringAsync();reString.Wait();Console.WriteLine(reString.Result);Console.ReadLine();}}
}
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版权声明：本文为CSDN博主「luckyone906」的原创文章，遵循CC 4.0 BY-SA版权协议，转载请附上原文出处链接及本声明。
原文链接：https://blog.csdn.net/u011555996/article/details/116721769