有选择的复制对象，即根据客户端传值来复制对象属性值

第一个方法是接收调用方发来的参数列表，此方法很有用。

第二个方法是根据调用方发来的参数来更新target对象，而不是只要source对象都更新为target对象的值。

其中，第二个对象复制方法中，有对象属性有别名的情况，不需要的话可以直接删掉相关代码。

private Dictionary<string, object> GetPostData()
        {

            Dictionary<string, object> dic = new Dictionary<string, object>();

            var context = Request.Properties["MS_HttpContext"] as System.Web.HttpContextBase;
            var request = context.Request;
            foreach (string key in request.QueryString.Keys) dic[key] = request.QueryString[key];
            foreach (string key in request.Form.Keys) dic[key] = request.Form[key];

            var stream = context.Request.InputStream;
            stream.Seek(0, System.IO.SeekOrigin.Begin);
            stream.Position = 0;
            using (StreamReader sr = new StreamReader(stream, Encoding.UTF8))
            {
                IDictionary<string, JToken> data = JsonConvert.DeserializeObject<JObject>(sr.ReadToEnd());
                data.ForEach(p => dic[p.Key] = p.Value);
            }

            return dic;
        }

/// <summary>
        /// 对象属性复制,该方法依赖HttpContent请求
        /// </summary>
        /// <param name="target"></param>
        /// <param name="source"></param>
        private void TryUpdateModel(IMember target, IMember source)
        {
            object value = null;
            if (target == null)
            {
                target = new ThreeMMember();
            }
            var PropertyList = source.GetType().GetProperties();
            var props = PropertyList.Select(p => p.Name).Join(GetPostData().Keys.ToArray(), p => p, p => p, (a, b) => a).Except(new List<string> { "Code" });
            foreach (var prop in props)
            {
                var pp = PropertyList.FirstOrDefault(p => p.Name == prop);
                value = pp.GetValue(source);
                var att = pp.GetCustomAttributes(typeof(BsonElementAttribute), true) as BsonElementAttribute[];
                var pp1 = att.Any() ? att.FirstOrDefault().ElementName : prop;
                target.SetProperty(pp1, value);
            }
        }