C# 后台获取API接口数据

 using System;
 using System.Collections.Generic;
 using System.IO;
 using System.Linq;
 using System.Net;
 using System.Text;
 using System.Threading.Tasks;

 namespace ClientTest
 {
     class BasicClient
     {
         public string SendRequest(string url, string method, string auth, string reqParams)
         {
             //这是发送Http请求的函数，可根据自己内部的写法改造
             HttpWebRequest myReq = null;
             HttpWebResponse response = null;
             string result = string.Empty;
             try
             {
                 myReq = (HttpWebRequest)WebRequest.Create(url);
                 myReq.Method = method;
                 myReq.ContentType = "application/json;";
                 myReq.KeepAlive = false;

                 //basic 验证下面这句话不能少
                 if (!String.IsNullOrEmpty(auth))
                 {
                     myReq.Headers.Add("Authorization", "Basic " + auth);
                 }

                 if (method == "POST" || method == "PUT")
                 {
                     byte[] bs = Encoding.UTF8.GetBytes(reqParams);
                     myReq.ContentLength = bs.Length;
                     using (Stream reqStream = myReq.GetRequestStream())
                     {
                         reqStream.Write(bs, , bs.Length);
                         reqStream.Close();
                     }
                 }

                 response = (HttpWebResponse)myReq.GetResponse();
                 HttpStatusCode statusCode = response.StatusCode;
                 if (Equals(response.StatusCode, HttpStatusCode.OK))
                 {
                     using (StreamReader reader = new StreamReader(response.GetResponseStream(), Encoding.UTF8))
                     {
                         result = reader.ReadToEnd();
                     }
                 }
             }
             catch (WebException e)
             {
                 if (e.Status == WebExceptionStatus.ProtocolError)
                 {
                     HttpStatusCode errorCode = ((HttpWebResponse)e.Response).StatusCode;
                     string statusDescription = ((HttpWebResponse)e.Response).StatusDescription;
                     using (StreamReader sr = new StreamReader(((HttpWebResponse)e.Response).GetResponseStream(), Encoding.UTF8))
                     {
                         result = sr.ReadToEnd();
                     }
                 }
                 else
                 {
                     result = e.Message;
                 }
             }
             finally
             {
                 if (response != null)
                 {
                     response.Close();
                 }
                 if (myReq != null)
                 {
                     myReq.Abort();
                 }
             }

             return result;
         }

         public string sendHttpRequest(string url, string reqparam, string method = "POST")
         {
             string auth = Base64Encode("key:secret");
             return SendRequest(url, method, auth, reqparam);
         }

         private string Base64Encode(string value)
         {
             byte[] bytes = Encoding.Default.GetBytes(value);
             return Convert.ToBase64String(bytes);
         }
     }
 }