C# Http请求(WebClient,HttpWebRequest)

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WebClient Post Get提交数据

using (WebClient client = new WebClient()){          client.Headers["version"] = "1.0";//http header 填入属性          client.Headers["APIToken"] = token;          string datas = "sdfdsfsdfsf";//Post提交的数据          string strs = GetStrs(order.OrderId);//获取xml文档          //resul是返回的结果          string resul = System.Text.Encoding.UTF8.GetString(client.UploadData("请求地址", "POST", Encoding.UTF8.GetBytes(datas)));          //Client.DownloadFile(url, paths);//url地址，paths写入文件的地址}

1. string postString = "arg1=a&arg2=b";//这里即为传递的参数，可以用工具抓包分析，也可以自己分析，主要是form里面每一个name都要加进来
2. byte[] postData = Encoding.UTF8.GetBytes(postString);//编码，尤其是汉字，事先要看下抓取网页的编码方式
3. string url = "http://localhost/register.php";//地址
4. WebClient webClient = new WebClient();
5. webClient.Headers.Add("Content-Type", "application/x-www-form-urlencoded");//采取POST方式必须加的header，如果改为GET方式的话就去掉这句话即可
client.Headers.Add("Content-Type", "application/x-www-form-urlencoded;charset=utf-8" );
6. byte[] responseData = webClient.UploadData(url, "POST", postData);//得到返回字符流
7. string srcString = Encoding.UTF8.GetString(responseData);//解码

获取返回500失败的信息响应的信息
服务端程序产生致命错误，http 表现为错误号 500，服务器拒绝响应

代码

try                    {                        using (WebClient client = new WebClient())                        {                            client.Headers.Add( "Content-Type", "application/x-www-form-urlencoded" );                            string result = Encoding .UTF8.GetString(client.UploadData(Helper.CountryUrl, Encoding.UTF8.GetBytes(Helper .ReaquestCountryData())));                            XmlDocument document = new XmlDocument();                            document.LoadXml(result);                                                       XmlNodeList xnlis = document.DocumentElement.ChildNodes[0].ChildNodes[0].ChildNodes;                            List<Service.country > list = new List<Service. country>();                            foreach (XmlNode x in xnlis)                            {                                list.Add( new Service.country () { enName = x.GetAttributeValue("enName") });                            }                            return list.ToArray();                        }                    }                    catch(WebException e)                    {                        Stream stream = e.Response.GetResponseStream();                        byte[] buf = new byte[e.Response.ContentLength];                        stream.Read(buf, 0, buf.Length);                        string str = Encoding .UTF8.GetString(buf);                                           }

//HttpWebRequest

//Get请求

public static string GetUrltoHtml(string Url,string type)        {            try            {                System.Net.WebRequest wReq = System.Net.WebRequest.Create(Url);                // Get the response instance.                System.Net.WebResponse wResp = wReq.GetResponse();                System.IO.Stream respStream = wResp.GetResponseStream();                // Dim reader As StreamReader = New StreamReader(respStream)                using (System.IO.StreamReader reader = new System.IO.StreamReader(respStream, Encoding.GetEncoding(type)))                {                    return reader.ReadToEnd();                }            }            catch (System.Exception ex)            {                //errorMsg = ex.Message;            }            return "";        }

//Post请求

///<summary>        ///采用https协议访问网络        ///</summary>        ///<param name="URL">url地址</param>        ///<param name="strPostdata">发送的数据</param>        ///<returns></returns>        public string OpenReadWithHttps(string URL, string strPostdata, string strEncoding)        {            Encoding encoding = Encoding.Default;            HttpWebRequest request = (HttpWebRequest)WebRequest.Create(URL);            request.Method = "post";            request.Accept = "text/html, application/xhtml+xml, */*";            request.ContentType = "application/x-www-form-urlencoded";            byte[] buffer = encoding.GetBytes(strPostdata);            request.ContentLength = buffer.Length;            request.GetRequestStream().Write(buffer, 0, buffer.Length);            HttpWebResponse response = (HttpWebResponse)request.GetResponse();            using( StreamReader reader = new StreamReader(response.GetResponseStream(), System.Text.Encoding.GetEncoding(strEncoding)))              {                   return reader.ReadToEnd();              }        }

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