public JsonResult UpdateSingle(int id, string actionName, string actionValue) 
  { 
   var res = new JsonResult(); 
   //var value = "actionValue"; 
   //db.ContextOptions.ProxyCreationEnabled = false; 
   var list = (from a in db.Articles 
      select new 
      { 
       name = a.ArtTitle, 
       yy = a.ArtPublishTime 
      }).Take(5); 
   //记得这里要select new 否则会报错：序列化类型 System.Data.Entity.DynamicProxies XXXXX 的对象时检测到循环引用。 
   //不select new 也行的加上这句 //db.ContextOptions.ProxyCreationEnabled = false; 
   res.Data = list;//返回列表 
 
   var name = "小华"; 
   var age = "12"; 
   var name1 = "小华"; 
   var age1 = "12"; 
   res.Data = new object[] { new { name, age }, new { name1, age1 } };//返回一个自定义的object数组 
 
   var person = new { Name = "小明", Age = 22, Sex = "男" }; 
   res.Data = person;//返回单个对象； 
 
   res.Data = "这是个字符串";//返回一个字符串,意义不大； 
 
   res.JsonRequestBehavior = JsonRequestBehavior.AllowGet;//允许使用GET方式获取，否则用GET获取是会报错。 
   return res; 
  } 

<a href="javascript:void(0);" onclick="javascript:upclick(this);">Click Me</a> 
<script type="text/javascript"> 
 function upclick(o) { 
  var obj = $(o); 
  alert(obj); 
  $.ajax({   
   url: "/Articles/UpdateSingle" + Math.random(), 
   type: "GET", 
   dataType: "json", 
   data: { id: obj.attr("id"), actionName: obj.attr("actionName"), actionValue: obj.attr("actionValue") }, 
   success: function (data) { 
//    if (data.result == "True") { 
//     alert("修改成功！"); 
//    } 
//    if (obj.attr("actionName") == "ArtVerify") { 
 
//    } 
    $(o).html(data[0].name); 
    obj.attr("actionValue", data[0].result); 
   } 
  }) 
 } 
</script> 

protected void Page_Load(object sender, EventArgs e) 
  { 
   var customer = new customer { name = "李华", sex = "男" }; 
   var customer1 = new customer { name = "小芳", sex = "女" }; 
   var li = new List<customer>(); 
   li.Add(customer); 
   li.Add(customer1); 
   var list = Newtonsoft.Json.JavaScriptConvert.SerializeObject(li); 
   var tt = "[{\"name\":\"李华\",\"sex\":\"男\"},{\"name\":\"小芳\",\"sex\":\"女\"}]"; 
   //new Newtonsoft.Json.JsonSerializer()..(customer); 
   Response.Write(tt); 
   Response.End(); 
  } 
 
  public class customer 
  { 
   public string name { get; set; } 
   public string sex { get; set; } 
  } 

<p> 
  <a href="javascript:void(0)" onclick="javascript:getJsonData();">GetJsonData</a> 
 </p> 
 <div id="dataDiv"> 
  ggg 
 </div> 
 <script type="text/javascript"> 
  function getJsonData() { 
   var str = ""; 
   $.getJSON("/Json.aspx", function (data) { 
    var tt = ""; 
    $.each(data, function (k, v) { 
     $.each(v, function (kk, vv) { 
      tt += kk + "：" + vv + "<br/>"; 
     }); 
    }); 
    $("#dataDiv").html(tt); 
   }); 
  } 
 </script>