public class SearchModelBinder : IModelBinder
    {
        public object BindModel(ControllerContext controllerContext, ModelBindingContext bindingContext)
        {
            var model = (QueryModel)(bindingContext.Model ?? new QueryModel());

            var dict = controllerContext.HttpContext.Request.Params;

            //序列化Topjui模型
            var advanceQuery = Serializable.JsonConvert.NewtonsoftJsonConvert<List<TopJuiQueryModel>>(dict["advanceFilter"]);

            if (advanceQuery != null)
            {
                foreach (var query in advanceQuery)
                {
                    model.Items.Add(new ConditionItem
                    {
                        Join = query.join,
                        Lb = query.lb,
                        Field = query.field,
                        Value = query.value,
                        Rb = query.rb,
                        Method = (QueryMethod)Enum.Parse(typeof(QueryMethod), query.op.First().ToString().ToUpper() + query.op.Substring(1)),
                    });
                }

                if (model.Items.Count > 0) return model;
            }


            //普通查询
            var queryKey = Serializable.JsonConvert.NewtonsoftJsonConvert<List<TopJuiQueryModel>>(dict["filterRules"]);
            if (advanceQuery == null) return model;
            foreach (var query in queryKey)
            {
                model.Items.Add(new ConditionItem
                {
                    Join = query.join,
                    Lb = query.lb,
                    Field = query.field,
                    Value = query.value,
                    Rb = query.rb,
                    Method = (QueryMethod)Enum.Parse(typeof(QueryMethod), query.op.First().ToString().ToUpper() + query.op.Substring(1)),
                });
            }

            return model;
        }
    }

    /// <summary>
    /// 定义Topjui模型
    /// </summary>
    public class TopJuiQueryModel
    {
        public string join { get; set; }
        public string lb { get; set; }
        public string field { get; set; }
        public string op { get; set; }
        public string value { get; set; }
        public string rb { get; set; }
    }

相关资料
EF动态查询