C#通过HttpWebRequest发送带有JSON|C#通过HttpWebRequest发送带有JSON Body的POST请求实现 C#通过HttpWebRequest发送带有JSO

起因
原来的处理方式
新的方式

起因
很多博客都有描述到这个问题，那么为什么我还要写一篇文章来说一下呢，因为其他的都似乎已经过时了，会导致其实body 并没有发送过去。至于为什么不使用其他的诸如 HttpClient 之类的，是由于业务需要。

原来的处理方式
通过 GetRequestStream 来获取请求流，后把需要发送的 Json 数据写入到流中

private T PostDataViaHttpWebRequest(string baseUrl,IReadOnlyDictionary headers,IReadOnlyDictionary urlParas,string requestBody=null){var resuleJson = string.Empty; try{var apiUrl = baseUrl; if (urlParas != null)urlParas.ForEach(p =>{if (apiUrl.IndexOf("{" + p.Key + "}") > -1){apiUrl = apiUrl.Replace("{" + p.Key + "}", p.Value); }else{apiUrl += string.Format("{0}{1}={2}", apiUrl.Contains("?") ? "&" : "?", p.Key, p.Value); }}); var req = (HttpWebRequest)WebRequest.Create(apiUrl); req.Method = "POST"; req.ContentType = "application/json"; req.ContentLength = 0; if (!requestBody.IsNullOrEmpty()){using (var postStream = req.GetRequestStream()){var postData = https://www.it610.com/article/Encoding.ASCII.GetBytes(requestBody); req.ContentLength = postData.Length; postStream.Write(postData, 0, postData.Length); }}if (headers != null){if (headers.Keys.Any(p => p.ToLower() == "content-type"))req.ContentType = headers.SingleOrDefault(p => p.Key.ToLower() == "content-type").Value; if (headers.Keys.Any(p => p.ToLower() == "accept"))req.Accept = headers.SingleOrDefault(p => p.Key.ToLower() == "accept").Value; }var response = (HttpWebResponse)req.GetResponse(); using(Stream stream = response.GetResponseStream()){using (StreamReader reader = new StreamReader(stream, Encoding.GetEncoding("UTF-8"))){resuleJson = reader.ReadToEnd(); }}}catch (Exception ex){return default(T); }return JsonConvert.DeserializeObject(resuleJson); }

但是会发现，数据一直没有正常发送过去，而且代码还显得比较复杂

新的方式
【C#通过HttpWebRequest发送带有JSON|C#通过HttpWebRequest发送带有JSON Body的POST请求实现】这里修改一下写入 RequestStream 的方式，使用 StreamWriter 包装一下，然后直接写入需要发送的 Json 数据

private T PostDataViaHttpWebRequest(string baseUrl,IReadOnlyDictionary headers,IReadOnlyDictionary urlParas,string requestBody=null){var resuleJson = string.Empty; try{var apiUrl = baseUrl; if (urlParas != null)urlParas.ForEach(p =>{if (apiUrl.IndexOf("{" + p.Key + "}") > -1){apiUrl = apiUrl.Replace("{" + p.Key + "}", p.Value); }else{apiUrl += string.Format("{0}{1}={2}", apiUrl.Contains("?") ? "&" : "?", p.Key, p.Value); }}); var req = (HttpWebRequest)WebRequest.Create(apiUrl); req.Method = "POST"; req.ContentType = "application/json"; //Defaltif (!requestBody.IsNullOrEmpty()){using (var postStream = new StreamWriter(req.GetRequestStream())){postStream.Write(requestBody); }}if (headers != null){if (headers.Keys.Any(p => p.ToLower() == "content-type"))req.ContentType = headers.SingleOrDefault(p => p.Key.ToLower() == "content-type").Value; if (headers.Keys.Any(p => p.ToLower() == "accept"))req.Accept = headers.SingleOrDefault(p => p.Key.ToLower() == "accept").Value; }var response = (HttpWebResponse)req.GetResponse(); using(Stream stream = response.GetResponseStream()){using (StreamReader reader = new StreamReader(stream, Encoding.GetEncoding("UTF-8"))){resuleJson = reader.ReadToEnd(); }}}catch (Exception ex){return default(T); }return JsonConvert.DeserializeObject(resuleJson); }

这样即可正确发送 Json 数据。

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