本文章是在VS2017的环境下，.net core 1.1版本以上。

在这期间，由于.net core 并不基于IIS，我们的过去的网络请求代码在.net core框架下，有可能会出现不兼容，报错的现象。这里大致介绍下在.net core 下如何进行http请求，主要仍然是GET和POST方法，有错误的地方，欢迎指正！

先来说POST,POST我实现了三种方法，前两种基于的原理是完全一致的，后面的有些小小的差异，但他们的本质都是http请求，本质上是无区别的，只是实现方法有所不同。

废话不多说，上代码：

POST异步方法：

/// 
        /// 异步请求post（键值对形式,可等待的）        /// 
        /// 网络基址("http://localhost:59315")        /// 网络的地址("/api/UMeng")        /// 键值对List
     
      
       > formData = new List
       
        
         >();formData.Add(new KeyValuePair
         
          ("userid", "29122"));formData.Add(new KeyValuePair
          
           ("umengids", "29122")); /// 
           编码格式 /// 
           头媒体类型 /// 
            public async Task
           
             HttpPostAsync(string uri, string url, List
            
             
              > formData = null, string charset = "UTF-8", string mediaType = "application/x-www-form-urlencoded") { string tokenUri = url; var client = new HttpClient(); client.BaseAddress = new Uri(uri); HttpContent content = new FormUrlEncodedContent(formData); content.Headers.ContentType = new MediaTypeHeaderValue(mediaType); content.Headers.ContentType.CharSet = charset; for (int i = 0; i < formData.Count; i++) { content.Headers.Add(formData[i].Key, formData[i].Value); } HttpResponseMessage resp = await client.PostAsync(tokenUri, content); resp.EnsureSuccessStatusCode(); string token = await resp.Content.ReadAsStringAsync(); return token; }
             
            
           
          
         
        
       
      
     

POST同步方法：

/// 
        /// 同步请求post（键值对形式）        /// 
        /// 网络基址("http://localhost:59315")        /// 网络的地址("/api/UMeng")        /// 键值对List
     
      
       > formData = new List
       
        
         >();formData.Add(new KeyValuePair
         
          ("userid", "29122"));formData.Add(new KeyValuePair
          
           ("umengids", "29122")); /// 
           编码格式 /// 
           头媒体类型 /// 
            public string HttpPost(string uri, string url, List
           
            
             > formData = null, string charset = "UTF-8", string mediaType = "application/x-www-form-urlencoded") { string tokenUri = url; var client = new HttpClient(); client.BaseAddress = new Uri(uri); HttpContent content = new FormUrlEncodedContent(formData); content.Headers.ContentType = new MediaTypeHeaderValue(mediaType); content.Headers.ContentType.CharSet = charset; for (int i = 0; i < formData.Count; i++) { content.Headers.Add(formData[i].Key, formData[i].Value); } var res = client.PostAsync(tokenUri, content); res.Wait(); HttpResponseMessage resp = res.Result; var res2 = resp.Content.ReadAsStringAsync(); res2.Wait(); string token = res2.Result; return token; }
            
           
          
         
        
       
      
     

遗憾的是，同步方法也是基于异步实现的，个人认为这样做会加大系统开销。如果各位有其他的高效实现，请不吝赐教！

接下来是通过流的方式进行POST：

public string Post(string url, string data, Encoding encoding, int type)        {            try            {                HttpWebRequest req = WebRequest.CreateHttp(new Uri(url));                if (type == 1)                {                    req.ContentType = "application/json;charset=utf-8";                }                else if (type == 2)                {                    req.ContentType = "application/xml;charset=utf-8";                }                else                {                    req.ContentType = "application/x-www-form-urlencoded;charset=utf-8";                }                req.Method = "POST";                //req.Accept = "text/xml,text/javascript";                req.ContinueTimeout = 60000;                byte[] postData = encoding.GetBytes(data);                Stream reqStream = req.GetRequestStreamAsync().Result;                reqStream.Write(postData, 0, postData.Length);                reqStream.Dispose();                var rsp = (HttpWebResponse)req.GetResponseAsync().Result;                var result = GetResponseAsString(rsp, encoding);                return result;                            }            catch (Exception ex)            {                throw;            }        }

private string GetResponseAsString(HttpWebResponse rsp, Encoding encoding)        {            Stream stream = null;            StreamReader reader = null;            try            {                // 以字符流的方式读取HTTP响应                stream = rsp.GetResponseStream();                reader = new StreamReader(stream, encoding);                return reader.ReadToEnd();            }            finally            {                // 释放资源                if (reader != null) reader.Dispose();                if (stream != null) stream.Dispose();                if (rsp != null) rsp.Dispose();            }        }

 

 

这种方式的POST还是将数据写入到流里面，进行POST,之所以写前两个key-value的形式，是为了符合java或者oc的风格，在c#书写的webapi中，由于接收形式是{=value}而不是{key=value}(由webapi的性质决定)，后续我会说如何在webapi中接收（key-value）的形式，适当避免.net后台人员与android和ios的矛盾，从而达到社会主义民主社会的长治久安。

接下来是get，同样同步异步都是由异步实现的，还请各位看官轻喷。

GET：

/// 
        /// 异步请求get(UTF-8)        /// 
        /// 链接地址               /// 写在header中的内容        /// 
             public static async Task
     
       HttpGetAsync(string url,  List
      
       
        > formData = null)        {            HttpClient httpClient = new HttpClient();            HttpContent content = new FormUrlEncodedContent(formData);            if (formData != null)            {                content.Headers.ContentType = new MediaTypeHeaderValue("application/x-www-form-urlencoded");                content.Headers.ContentType.CharSet = "UTF-8";                for (int i = 0; i < formData.Count; i++)                {                    content.Headers.Add(formData[i].Key, formData[i].Value);                }            }            var request = new HttpRequestMessage()            {                RequestUri = new Uri(url),                Method = HttpMethod.Get,            };            for (int i = 0; i < formData.Count; i++)            {                request.Headers.Add(formData[i].Key, formData[i].Value);            }            var resp = await httpClient.SendAsync(request);            resp.EnsureSuccessStatusCode();            string token = await resp.Content.ReadAsStringAsync();            return token;        }
       
      
     

 

/// 
        /// 同步get请求        /// 
        /// 链接地址               /// 写在header中的键值对        /// 
             public  string HttpGet(string url, List
     
      
       > formData = null)        {            HttpClient httpClient = new HttpClient();            HttpContent content = new FormUrlEncodedContent(formData);            if (formData != null)            {                content.Headers.ContentType = new MediaTypeHeaderValue("application/x-www-form-urlencoded");                content.Headers.ContentType.CharSet = "UTF-8";                for (int i = 0; i < formData.Count; i++)                {                    content.Headers.Add(formData[i].Key, formData[i].Value);                }            }            var request = new HttpRequestMessage()            {                RequestUri = new Uri(url),                Method = HttpMethod.Get,            };            for (int i = 0; i < formData.Count; i++)            {                request.Headers.Add(formData[i].Key, formData[i].Value);            }            var res =  httpClient.SendAsync(request);            res.Wait();            var resp = res.Result;            Task
       
         temp = resp.Content.ReadAsStringAsync();            temp.Wait();            return temp.Result;        }
       
      
     

以上就是这样吧，还有，我是一个经不起批评的人，如果你批评我，我就骂你（玩笑）。请大家不吝赐教！感谢