if (!string.IsNullOrEmpty(FarmWorkId)) { data = data.Where(p => p.TypeId == Convert.ToInt32(FarmWorkId)); } 解决方法: if (!string.IsNullOrEmpty(FarmWorkId)) { int i = Convert.ToInt32(FarmWorkId); data = data.Where(p => p.TypeId == i); }…

  通常原始代码如下: Where id=Convert.ToInt32(cousid) 更改后代码: Var currentid= Convert.ToInt32(cousid); Wehre id=currentid;…

private sys_User GetUserInfo() { sys_User model = null; var userId = Convert.ToInt32(AccountHelper.GetAccountUserId()); var list = BLLSingleton.Instance.IUserService.GetListBy(c => c.UserId == userId); if (list != null) model = list.FirstOrDefault();…

LINQ to Entities works by translating LINQ queries to SQL queries, then executing the resulting query on the database and converting the result back to application entities. Because of this crossover of two languages, it will only work when SQL-compa…

报错:System.NotSupportedException: LINQ to Entities does not recognize the method ...... get_Item(Int32)' method, and this method cannot be translated into a store expression. 在控制器中有如下一段代码: var tempList = SomeService.LoadEntities(c => c.DelFlag == (sho…

根据用户输入的起始日期,查询以起始日期开始的前20条记录,在ASP.NET MVC的Controller代码中这样写: var Logs = db.Log.Take(20); if (!string.IsNullOrEmpty(dateBegin)) { Logs = Logs.Where(a => a.Date >= Convert.ToDateTime(dateBegin)).Take(); } 运行后,出现下面错误信息: 对于这种情况,要清楚:本表达式只是LINQ to Entities…

NormalSubmission=analysis.Count(x=>x.FinishTime<= endTime.AddDays(1))报错linq不能识别 => var endTime = analysis.Select(x => x.EndTime).FirstOrDefault().AddDays(1); NormalSubmission=analysis.Count(x=>x.FinishTime<= endTime), 把方法放到外面就可以了…

System.Data.Objects.EntityFunctions和System.Data.Objects.SqlClient.SqlFunctions中的方法进行比较,如下 where System.Data.Objects.SqlClient.SqlFunctions.DateDiff("s",DateTime.Now,u.Time)>0 where System.Data.Objects.EntityFunctions.DiffSeconds(DateTime.Now,…

断点调试发现报错的语句为: public ActionResult SomeMethod(string someId) { var temp = SomeService.LoadEntities(a => a.ID == int.Parse(someId)); } 原因是:在Lambda表达式内部不能实现数据类型转换.解决方法:在使用Lambda表达式之前,先对数据类型进行转换. public ActionResult SomeMethod(string someId) { int tempIn…

錯誤提示: LINQ to Entities does not recognize the method 'System.DateTime ToDateTime(System.String)' method, and this method cannot be translated into a store expression. LINQ to Entities 不识别方法“System.DateTime ToDateTime(System.String)”,因此该方法无法转换为存储表达式.…