WebService – 3.后台调用WebService，根级别上的数据无效

1.因为我的webservice返回的是json，

2.ajax传递跨域不安全，

3.contentType: "application/json; charset=utf-8", 这个是直接访问的webservice

所以还是采用后台调用，

如果引用微软的webService直接new对象，调用方法，就会报错根级别上的数据无效

困扰了我1天，最后的解决方法，

创建辅助类，

    public class WebServiceHelper
    {
        /// <summary>
        ///
        /// </summary>
        /// <param name="url">地址</param>
        /// <param name="method">方法</param>
        /// <param name="param">json参数</param>
        /// <returns></returns>
        public static string WebServiceApp(string url, string method, string param)
        {
            byte[] byteArray = Encoding.UTF8.GetBytes("json=" + param);
            HttpWebRequest webRequest = (HttpWebRequest)WebRequest.Create(new Uri(url + "/" + method));
            webRequest.Method = "POST";
            webRequest.ContentType = "application/x-www-form-urlencoded";
            webRequest.ContentLength = byteArray.Length;
            Stream newStream = webRequest.GetRequestStream();
            newStream.Write(byteArray, 0, byteArray.Length);
            newStream.Close();
            HttpWebResponse response = (HttpWebResponse)webRequest.GetResponse();
            StreamReader php = new StreamReader(response.GetResponseStream(), Encoding.UTF8);
            string phpend = php.ReadToEnd();

            return phpend;
        }
    }

调用方法：