本文章是在VS2017的環境下，.net core 1.1版本以上。
在這期間，由于.net core 并不基于IIS，我們的過去的網絡請求代碼在.net core框架下，有可能會出現不兼容，報錯的現象。這里大致介紹下在.net core 下如何進行http請求，主要仍然是GET和POST方法，有錯誤的地方，歡迎指正！
先來說POST,POST我實現了三種方法，前兩種基于的原理是完全一致的，后面的有些小小的差異，但他們的本質都是http請求，本質上是無區別的，只是實現方法有所不同。
廢話不多說，上代碼：
POST異步方法：
/// <summary> /// 異步請求post（鍵值對形式,可等待的） /// </summary> /// <param name="uri">網絡基址("http://localhost:59315")</param> /// <param name="url">網絡的地址("/api/UMeng")</param> /// <param name="formData">鍵值對List<KeyValuePair<string, string>> formData = new List<KeyValuePair<string, string>>();formData.Add(new KeyValuePair<string, string>("userid", "29122"));formData.Add(new KeyValuePair<string, string>("umengids", "29122"));</param> /// <param name="charset">編碼格式</param> /// <param name="mediaType">頭媒體類型</param> /// <returns></returns> public async Task<string> HttpPostAsync(string uri, string url, List<KeyValuePair<string, 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> /// 同步請求post（鍵值對形式） /// </summary> /// <param name="uri">網絡基址("http://localhost:59315")</param> /// <param name="url">網絡的地址("/api/UMeng")</param> /// <param name="formData">鍵值對List<KeyValuePair<string, string>> formData = new List<KeyValuePair<string, string>>();formData.Add(new KeyValuePair<string, string>("userid", "29122"));formData.Add(new KeyValuePair<string, string>("umengids", "29122"));</param> /// <param name="charset">編碼格式</param> /// <param name="mediaType">頭媒體類型</param> /// <returns></returns> public string HttpPost(string uri, string url, List<KeyValuePair<string, 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; }遺憾的是，同步方法也是基于異步實現的，個人認為這樣做會加大系統開銷。如果各位有其他的高效實現，請不吝賜教！
接下來是通過流的方式進行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 { // 以字符流的方式讀取HTTP響應 stream = rsp.GetResponseStream(); reader = new StreamReader(stream, encoding); return reader.ReadToEnd(); } finally { // 釋放資源 if (reader != null) reader.Dispose(); if (stream != null) stream.Dispose(); if (rsp != null) rsp.Dispose(); } }這種方式的POST還是將數據寫入到流里面，進行POST,之所以寫前兩個key-value的形式，是為了符合java或者oc的風格，在c#書寫的webapi中，由于接收形式是{=value}而不是{key=value}(由webapi的性質決定)，后續我會說如何在webapi中接收（key-value）的形式，適當避免.net后臺人員與android和ios的矛盾，從而達到社會主義民主社會的長治久安。
接下來是get，同樣同步異步都是由異步實現的，還請各位看官輕噴。
GET：
/// <summary> /// 異步請求get(UTF-8) /// </summary> /// <param name="url">鏈接地址</param> /// <param name="formData">寫在header中的內容</param> /// <returns></returns> public static async Task<string> HttpGetAsync(string url, List<KeyValuePair<string, string>> 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; } /// <summary> /// 同步get請求 /// </summary> /// <param name="url">鏈接地址</param> /// <param name="formData">寫在header中的鍵值對</param> /// <returns></returns> public string HttpGet(string url, List<KeyValuePair<string, string>> 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<string> temp = resp.Content.ReadAsStringAsync(); temp.Wait(); return temp.Result; }以上就是本文的全部內容，希望對大家的學習有所幫助，也希望大家多多支持VeVb武林網。
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