.net post请求webservice

class program
    {
        static void main(string[] args)
        {
            var m = "m=" + jsonconvert.serializeobject(new { age = 1, name = "jxp" });
            var a = httphelper.postrequest("http://localhost:7132/jxp.asmx/helloworld", datatypeenum.form, m);
            var xmldoc = new xmldocument();
            xmldoc.loadxml(a);
            var nsmgr = new xmlnamespacemanager(xmldoc.nametable); nsmgr.addnamespace("ns", "http://tempuri.org/");
            xmlnode errornode = xmldoc.selectsinglenode("/ns:string", nsmgr);
            var b = jsonconvert.deserializeobject(errornode.innertext);
            console.writeline(b);
            console.readkey();
        }
    }

[webmethod]
public string helloworld(string m)
{
      return m;
}

public class httphelper
    {
        /// <summary>
        /// post带参请求
        /// </summary>
        /// <param name="url"></param>
        /// <param name="contenttype">指定参数类型</param>
        /// <param name="strdata"></param>
        /// <param name="dicheader"></param>
        /// <returns></returns>
        public static string postrequest(string url, datatypeenum contenttype, string strdata, dictionary<string, string> dicheader = null)
        {
            string result;
            var webrequest = webrequest.create(url);
            if (dicheader != null)
                foreach (var m in dicheader)
                {
                    webrequest.headers.add(m.key, m.value);
                }
            webrequest.method = methodtypeenum.post.tostring();
            webrequest.proxy = null;
            if (contenttype == datatypeenum.form)
            {
                webrequest.contenttype = "application/x-www-form-urlencoded";
            }
            else
            {
                webrequest.contenttype = "application/" + contenttype;
            }
            
            byte[] reqbodybytes = system.text.encoding.utf8.getbytes(strdata);
            stream reqstream = webrequest.getrequeststream();//加入需要发送的参数
            reqstream.write(reqbodybytes, 0, reqbodybytes.length);
            reqstream.close();
            using (var reader = new streamreader(webrequest.getresponse().getresponsestream()))
            {
                result = reader.readtoend();
            }
            return result;
        }

        /// <summary>
        /// get不带参请求
        /// </summary>
        /// <param name="url"></param>
        /// <returns></returns>
        public static string getrequest(string url)
        {
            string result;
            webrequest webrequest = webrequest.create(url);
            webrequest.method = methodtypeenum.get.tostring();
            webrequest.proxy = null;
            using (var reader = new streamreader(webrequest.getresponse().getresponsestream()))
            {
                result = reader.readtoend();
            }
            return result;
        }
    }

    /// <summary>
    /// 带参数据类型
    /// </summary>
    public enum datatypeenum
    {
        json,
        xml,
        form
    }

    /// <summary>
    /// 带参数据类型
    /// </summary>
    public enum methodtypeenum
    {
        get,
        post
    }

 返回json

 .net post请求webservice