/// <summary>
 /// 定位一项资源。
 /// </summary>
 /// <param name="url"></param>
 /// <returns></returns>
 public RestResource this[string url] {
     get {
         if (resources.ContainsKey(url))
         {
             return(resources[url]);
         }
         else
         {
             var result = new RestResource(this, url);
             resources.Add(url, result);
             return(result);
         }
     }
 }
 public RestInstance(RestResource Resource, string Instance)
 {
     resource = Resource;
     instance = Instance;
 }