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：

/// summary/// 异步请求post（键值对形式,可等待的）/// /summary/// param name=uri网络基址(:59315)/param/// param name=url网络的地址(/api/UMeng)/param/// param name=formData键值对ListKeyValuePairstring, string formData = new ListKeyValuePairstring, string();formData.Add(new KeyValuePairstring, string(userid, 29122));formData.Add(new KeyValuePairstring, string(umengids, 29122));/param/// param name=charset编码格式/param/// param name=mediaType头媒体类型/param/// returns/returnspublic async Taskstring HttpPostAsync(string uri, string url, ListKeyValuePairstring, string 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：

/// summary/// 同步请求post（键值对形式）/// /summary/// param name=uri网络基址(:59315)/param/// param name=url网络的地址(/api/UMeng)/param/// param name=formData键值对ListKeyValuePairstring, string formData = new ListKeyValuePairstring, string();formData.Add(new KeyValuePairstring, string(userid, 29122));formData.Add(new KeyValuePairstring, string(umengids, 29122));/param/// param name=charset编码格式/param/// param name=mediaType头媒体类型/param/// returns/returnspublic string HttpPost(string uri, string url, ListKeyValuePairstring, string 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();}}

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