C#调用接口的四种方式介绍

        #region get方式

        public string HttpGet(string url)
        {

            Encoding encoding = Encoding.UTF8;
            HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);
            request.Method = "GET";
            request.ContentType = "application/json";
            request.Headers["Accept-Encoding"] = "gzip,deflase";
            request.AutomaticDecompression = DecompressionMethods.GZip;
            HttpWebResponse response = (HttpWebResponse)request.GetResponse();

            // HttpCookie cookies = new HttpCookie("admin");  //如果有需要通过登录实现保存cookie值的话可以加一部分
            // cookies.Value = Convert.ToString(response.Headers["Set-Cookie"]); // 通过响应请求读取带cookie的http数据
            // cookies.Expires = DateTime.Now.AddDays(1);
            //  HttpContext.Current.Response.Cookies.Add(cookies);

            using (StreamReader reader = new StreamReader(response.GetResponseStream(), Encoding.UTF8))
            {
                return reader.ReadToEnd();
            }
        }
        #endregion

public string HttpPost2(string url, string body)
{

   //把用户传过来的数据转成“UTF-8”的字节流
    Encoding encoding = Encoding.UTF8;
    //先根据用户请求的uri构造请求地址
    //创建Web访问对象
    HttpWebRequest request = (HttpWebRequest) WebRequest.Create(url);
    request.Method = "POST";
    // request.Accept = "application/json";
   request.ContentType = "application/json; charset=UTF-8";
   request.Headers["Accept-Encoding"] = "gzip, deflate";
   request.AutomaticDecompression = DecompressionMethods.GZip;
   //HttpCookie Cookie = System.Web.HttpContext.Current.Request.Cookies["admin"];  //若是需要登录过后再能访问获取url的数据，需要在请求头中设置cookie值
   //if (Cookie != null)
   //    request.Headers.Add("Cookie", Cookie.Value.ToString());

   byte[] buffer = encoding.GetBytes(body);
   request.ContentLength = buffer.Length;
   request.GetRequestStream().Write(buffer, 0, buffer.Length);
   //通过Web访问对象获取响应内容
   HttpWebResponse response = (HttpWebResponse) request.GetResponse();
   //通过响应内容流创建StreamReader对象，因为StreamReader更高级更快
   using (StreamReader reader = new StreamReader(response.GetResponseStream(), Encoding.UTF8))
   {
    return reader.ReadToEnd();//利用StreamReader就可以从响应内容从头读到尾
   }
 }

        #region Put请求
        public string Put(string data, string uri)
        {//创建Web访问对象
            HttpWebRequest Request = (HttpWebRequest)WebRequest.Create(uri);
            //把用户传过来的数据转成“UTF-8”的字节流
            byte[] buf = System.Text.Encoding.GetEncoding("UTF-8").GetBytes(data);

            Request.Method = "PUT";
            Request.ContentLength = buf.Length;
            Request.ContentType = "application/json";
            Request.MaximumAutomaticRedirections = 1;
            Request.AllowAutoRedirect = true;
            //发送请求
            Stream stream = Request.GetRequestStream();
            stream.Write(buf, 0, buf.Length);
            stream.Close();

            //获取接口返回值
            //通过Web访问对象获取响应内容
            HttpWebResponse Response = (HttpWebResponse)Request.GetResponse();
            //通过响应内容流创建StreamReader对象，因为StreamReader更高级更快
            StreamReader reader = new StreamReader(Response.GetResponseStream(), Encoding.UTF8);
            //string returnXml = HttpUtility.UrlDecode(reader.ReadToEnd());//如果有编码问题就用这个方法
            string returnXml = reader.ReadToEnd();//利用StreamReader就可以从响应内容从头读到尾
            reader.Close();
            Response.Close();
            return returnXml;

        }           
        #endregion

        #region Delete请求
        public string Delete(string data, string uri)
        {
            //创建Web访问对象
            HttpWebRequest Request = (HttpWebRequest)WebRequest.Create(uri);
            //把用户传过来的数据转成“UTF-8”的字节流
            byte[] buf = System.Text.Encoding.GetEncoding("UTF-8").GetBytes(data);

            Request.Method = "DELETE";
            Request.ContentLength = buf.Length;
            Request.ContentType = "application/json";
            Request.MaximumAutomaticRedirections = 1;
            Request.AllowAutoRedirect = true;
            //发送请求
            Stream stream = Request.GetRequestStream();
            stream.Write(buf, 0, buf.Length);
            stream.Close();

            //获取接口返回值
            //通过Web访问对象获取响应内容
            HttpWebResponse Response = (HttpWebResponse)Request.GetResponse();
            //通过响应内容流创建StreamReader对象，因为StreamReader更高级更快
            StreamReader reader = new StreamReader(Response.GetResponseStream(), Encoding.UTF8);
            //string returnXml = HttpUtility.UrlDecode(reader.ReadToEnd());//如果有编码问题就用这个方法
            string returnXml = reader.ReadToEnd();//利用StreamReader就可以从响应内容从头读到尾
            reader.Close();
            Response.Close();
            return returnXml;

        }
       #endregion