C# json 转 dictionary

public static Dictionary<string, object> Json(string json)
{
JavaScriptSerializer serializer = new JavaScriptSerializer();
Dictionary<string, object> obj = (Dictionary<string, object>)serializer.DeserializeObject(json);
//Dictionary<string, object> dic = (Dictionary<string, object>)obj;
return obj;
// //IPObj ret = serializer.Deserialize(retValue);
}