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

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<t>(string baseurl,
            ireadonlydictionary<string, string> headers,
            ireadonlydictionary<string, string> 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 = 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<t>(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

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<t>(string baseurl,
            ireadonlydictionary<string, string> headers,
            ireadonlydictionary<string, string> 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"; //defalt

                if (!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<t>(resulejson);
        }

这样即可正确发送 json 数据。

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