C# 调用WebApi

学习笔记：

1，WebRequest方式 Get请求

        #region 方法3 .WebRequest方式 Get请求
        public static string HttpGet(string url)
        {
            //ServicePointManager.ServerCertificateValidationCallback = new RemoteCertificateValidationCallback(CheckValidationResult);
            Encoding encoding = Encoding.UTF8;
            HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);
            request.Method = "GET";
            request.Accept = "text/html, application/xhtml+xml, */*";
            request.ContentType = "application/json";

            HttpWebResponse response = (HttpWebResponse)request.GetResponse();
            using (StreamReader reader = new StreamReader(response.GetResponseStream(), Encoding.UTF8))
            {
                return reader.ReadToEnd();
            }
        }
        private void button3_Click(object sender, EventArgs e)
        {
            //string ss = HttpGet("http://localhost:55837/api/product");
            string ss = HttpGet(txt_get_url.Text);
            this.textBox3.Text += ss;
        }

        #endregion

　　

2，WebRequest方式 Get带参数请求

 #region WebRequest方式 Get带参数请求

        public static string HttpGet6(string url)
        {
            //ServicePointManager.ServerCertificateValidationCallback = new RemoteCertificateValidationCallback(CheckValidationResult);
            Encoding encoding = Encoding.UTF8;
            HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);
            request.Method = "GET";
            request.Accept = "text/html, application/xhtml+xml, */*";
            request.ContentType = "application/json";

            HttpWebResponse response = (HttpWebResponse)request.GetResponse();
            using (StreamReader reader = new StreamReader(response.GetResponseStream(), Encoding.UTF8))
            {
                return reader.ReadToEnd();
            }
        }
        private void button6_Click(object sender, EventArgs e)
        {
            string id = this.txt_get_parameter.Text;
            string ss = HttpGet6(txt_get_url.Text+ "/"+id.Trim());
            this.textBox6.Text += ss;
        }


        #endregion

　　

3，WebRequest方式 Post请求

 "application/x-www-form-urlencoded";//参数：username=admin&password=123 如果参数是json格式或者参数写错不会报错的

            byte[] buffer = encoding.GetBytes(body);
            request.ContentLength = buffer.Length;
            request.GetRequestStream().Write(buffer, 0, buffer.Length);
            HttpWebResponse response = (HttpWebResponse)request.GetResponse();
            using (StreamReader reader = new StreamReader(response.GetResponseStream(), Encoding.UTF8))
            {
                return reader.ReadToEnd();
            }
        }
        private void button4_Click(object sender, EventArgs e)
        {
            string url = this.txt_post_url.Text;
            string body = this.txt_post_parameter.Text;
            string ss = HttpWebRequestPost(url, body);
            this.textBox4.Text += ss;
        }

        #endregion

　　

4，HttpClient 方式 Get请求

  #region 方法4 HttpClient 方式 Get请求

        public static string HttpClienGet(string url)
        {
            HttpClient hc = new HttpClient();
            string html= hc.GetStringAsync(url).Result;
            return html;
        }

        private void btn_HttpClentGet_Click(object sender, EventArgs e)
        {
            string url = this.txt_get_url.Text;
            string html = HttpClienGet(url);
            txt_HttpClentGet_Result.Text += html;
        }

        #endregion

　　

5，HttpClient 方式 Post请求

        #region 方法4 HttpClient 方式 Post请求

        public static async void HttpClientPost(string url)
        {
            var handler = new HttpClientHandler() { AutomaticDecompression = DecompressionMethods.None };

            using (var httpclient = new HttpClient(handler))
            {
                httpclient.BaseAddress = new Uri(url);
                var content = new FormUrlEncodedContent(new Dictionary<string, string>()
                {
                    {"name", "杜宗英"},
                    {"age", "18"},
                    {"gender","false" }
                });

                var  response = await httpclient.PostAsync(url, content);

                string responseString = await response.Content.ReadAsStringAsync();
                MessageBox.Show(responseString);
            }
        }



        private void button5_Click(object sender, EventArgs e)
        {
            string url = this.txt_post_url.Text;
            HttpClientPost(url);

        }
        #endregion

　

6，WebClient方式 Post请求

        #region WebClient方式 Post请求
        /// <summary>
        ///
        /// </summary>
        /// <param name="url"></param>
        /// <param name="body">传递的参数</param>
        /// <returns></returns>
        public static string WebClientPost(string url,string body)
        {
            byte[] postData = Encoding.UTF8.GetBytes(body);//编码，尤其是汉字，事先要看下抓取网页的编码方式
            WebClient webClient=new WebClient();
            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
            byte[] responseData = webClient.UploadData(url, "POST", postData);//得到返回字符流
            string srcString = Encoding.UTF8.GetString(responseData);//解码
            return srcString;
        }

        private void btn_WebClient_Post_Click(object sender, EventArgs e)
        {
            string url = this.txt_post_url.Text;
            string body = this.txt_post_parameter.Text;
            string srcString = WebClientPost(url, body);
            this.txt_WebClient_Post.Text += srcString;
        }

        #endregion