HttpWebRequest 调用 WebAPI

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using System;
using System.Text;
using System.Net;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            string requestMethod = "POST";
            string param = "platformKey=test";
            string url = "http://192.168.x.xx:xxx/api/info/getListByPlatformKey";
            string result = RequestAPI(requestMethod, url, param);
            Console.WriteLine(result);

            requestMethod = "GET";
            param = "systemid=1";
            url = "http://192.168.x.xx:xxx/api/info/info";
            result = RequestAPI(requestMethod, url, param);
            Console.WriteLine(result);

            Console.ReadLine();
        }

        private static string RequestAPI(string requestMethod, string url, string param)
        {
            requestMethod = requestMethod.ToUpper();
            string content = string.Empty;
            byte[] bs = Encoding.ASCII.GetBytes(param);
            if (requestMethod == "GET")
            {
                url = string.Format("{0}?{1}", url, param);
            }
            HttpWebRequest req = (HttpWebRequest)WebRequest.Create(url);
            req.Method = requestMethod;
            req.ContentType = "application/x-www-form-urlencoded";
            req.ContentLength = bs.Length;
            req.Timeout = 120 * 1000;
            try
            {
                if (requestMethod == "POST")
                {
                    using (System.IO.Stream reqStream = req.GetRequestStream())
                    {
                        reqStream.Write(bs, 0, bs.Length);
                    }
                }
                using (WebResponse wr = req.GetResponse()) //返回
                {
                    System.IO.Stream res = wr.GetResponseStream();
                    using (System.IO.StreamReader reader = new System.IO.StreamReader(res))
                    {
                        content = reader.ReadToEnd();
                    }
                }
            }
            catch (Exception ex)
            {
                content = ex.Message;
            }
            return content;
        }
    }
}