c# 後臺GET、POST、PUT、DELETE傳輸發送json數據

一、Get 方式傳輸

　　　　　//url為請求的網址，param參數為需要查詢的條件（服務端接收的參數，沒有則為null）
        //返回該次請求的響應
        public string HttpGet(string url, Dictionary<String, String> param)
        {
            if (param != null) //有參數的情況下，拼接url
            {
                url = url + "?";
                foreach (var item in param)
                {
                    url = url + item.Key + "=" + item.Value + "&";
                }
                url = url.Substring(0, url.Length - 1);
            }
            HttpWebRequest request = WebRequest.Create(url) as HttpWebRequest;//創建請求
            request.Method = "GET"; //請求方法為GET
            HttpWebResponse res; //定義返回的response
            try
            {
                res = (HttpWebResponse)request.GetResponse(); //此處發送了請求並獲得響應
            }
            catch (WebException ex)
            {
                res = (HttpWebResponse)ex.Response;
            }
            StreamReader sr = new StreamReader(res.GetResponseStream(), Encoding.UTF8);
            string content = sr.ReadToEnd(); //響應轉化為String字元串
            return content;
        }

二、POST 方式傳輸

public static string HttpPost(string url, Dictionary<String, String> param)
        {
            HttpWebRequest request = WebRequest.Create(url) as HttpWebRequest; //創建請求
            CookieContainer cookieContainer = new CookieContainer();
            request.CookieContainer = cookieContainer;
            request.AllowAutoRedirect = true;
            //request.AllowReadStreamBuffering = true;
            request.MaximumResponseHeadersLength = 1024;
            request.Method = "POST"; //請求方式為post
            request.AllowAutoRedirect = true;
            request.MaximumResponseHeadersLength = 1024;
            request.ContentType = "application/json";
            JObject json = new JObject();
            if (param.Count != 0) //將參數添加到json對象中
            {
                foreach (var item in param)
                {
                    json.Add(item.Key, item.Value);
                }
            }
            string jsonstring = json.ToString();//獲得參數的json字元串
            byte[] jsonbyte = Encoding.UTF8.GetBytes(jsonstring);
            Stream postStream = request.GetRequestStream();
            postStream.Write(jsonbyte, 0, jsonbyte.Length);
            postStream.Close();
            //發送請求並獲取相應回應數據       
            HttpWebResponse res;
            try
            {
                res = (HttpWebResponse)request.GetResponse();
            }
            catch (WebException ex)
            {
                res = (HttpWebResponse)ex.Response;
            }
            StreamReader sr = new StreamReader(res.GetResponseStream(), Encoding.UTF8);
            string content = sr.ReadToEnd(); //獲得響應字元串
            return content;
        }

其中PUT、DELETE方式跟上面基本相似。這裡就不再多說明