方法描述：通过请求url，调用对方系统的接口，拿到数据并返回；

方法参数：访问系统的url地址

url请求参数：searchDate（当前请求的年月：2023-7），需进行url编码

public string GetDataByRequestUrl(string url)
{requestUrl = url + "&searchDate:" +             System.Web.HttpUtility.UrlEncode( DateTime.Now.Year.ToString() + "-" +             DateTime.Now.Month.ToString());//请求urlHttpWebRequest webRequest= (HttpWebRequest)WebRequest.Create(requestUrl);webRequest.Method="GET";webRequest.ContentType = "text/html;charset=UTF-8";//返回数据HttpWebResponse webResponse=(HttpWebResponse)webRequest.GetResponse();Stream myResponseStream = webResponse.GetResponseStream();StreamReader myStreamReader = new StreamReader(myResponseStream,     Encoding.GetEncoding("utf-8"));string retString = myStreamReader.ReadToEnd();myStreamReader.Close();myResponseStream.Close();return retString ;
}