asp.net中WebResponse 跨域访问实例代码

/// <summary>
        /// 使用Post方法发送数据
        /// </summary>
        /// <param name=”pi_strPostURl”>提交地址</param>
        /// <param name=”pi_strParm”>参数</param>
        /// <returns></returns>      
        public static string PostResponse(string pi_strPostURl, string pi_strParm)
        {
            try
            {
                //编码
                Encoding t_Encoding = Encoding.GetEncoding(“GB2312“);
        Uri t_Uri = new Uri(pi_strPostURl);             
                byte[] paramBytes = t_Encoding.GetBytes(pi_strParm);
                WebRequest t_WebRequest = WebRequest.Create(t_Uri);
        t_WebRequest.Timeout = 100000;
                //设置ContentType
                t_WebRequest.ContentType = “application/x--form-urlencoded“;

                t_WebRequest.Method = EnumMethod.POST.ToString();                //初始化
                using (Stream t_REStream = t_WebRequest.GetRequestStream())
                {
                    //发送数据
                    requestStream.Write(paramBytes, 0
, paramBytes.Length);
                }

                WebResponse t_WebResponse =
 t_WebRequest.GetResponse();

                using (StreamReader t_StreamReader = new StreamReader(t_WebResponse .GetResponseStream(), t_Encoding))
                {
                    return t_StreamReader.ReadToEnd();
                }
            }
            catch
            {
                return “ERROR“;
            }
        }

public static string GetResponse(string pi_strPostURl, string pi_strParm)
        {
            try
            {
                //编码
                Encoding t_Encoding = Encoding.GetEncoding(“GB2312“);              
                Uri t_Uri = new Uri(string.Format(“{0}?{1}“, pi_strPostURl, pi_strParm));

                WebRequest t_WebRequest =
 WebRequest.Create(t_Uri);

                t_WebRequest.Timeout = 100000;
                t_WebRequest.ContentType = “application/x--form-urlencoded“;

                t_WebRequest.Method = EnumMethod.GET.ToString(); 
                WebResponse t_WebResponse =
 t_WebRequest.GetResponse();

                using (StreamReader t_StreamReader = new StreamReader(t_WebResponse.GetResponseStream(), t_Encoding))
                {
                    return t_StreamReader.ReadToEnd();
                }
            }
            catch (Exception e)
            {
                return e.ToString();
            }
        }
public static string AtionResponse(string pi_Url, EnumMethod pi_Method)
        {
             string t_strUrlPath=“”;
             string t_parm = “”;           
             Uri  t_Url = new Uri(pi_Url);               
             t_parm= t_Url.Query;
             if (parmString.StartsWith(“?“))
                    t_parm = t_parm.Remove(0, 1);               
             t_strUrlPath = “http://“ + t_Url .Authority + t_Url .AbsolutePath;
            return GetResponse(t_strUrlPath, t_parm, pi_Method);
        }
 public enum EnumMethod
        {
            POST,
            GET
        }

$.ajax({
 type : "get",
 async:false,
 url : "https://.jb51./ajax.do",
 dataType : "jsonp",
 jsonp: "callbackparam",//服务端用于接收callback调用的function名的参数
 jsonpCallback:"suess_jsonpCallback",//callback的function名称
 suess : function(json){
  alert(json);
  alert(json[0].name);
 },
 error:function(){
  alert('fail');
 }
});

public void ProcessRequest (HttpContext context) {
 context.Response.ContentType = "text/plain";
 String callbackFunName = context.Request["callbackparam"];
 context.Response.Write(callbackFunName + "([ { name:"John"}])");
}