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,…

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); }…

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.…

我就不屁话,能一张图就解决的就不说话了 2015-03-28 14:53:24,440 [10] ERROR log - System.NotSupportedException: LINQ to Entities 不支持 LINQ 表达式节点类型“ArrayIndex”. 在 System.Data.Entity.Core.Objects.ELinq.ExpressionConverter.NotSupportedTranslator.Translate(ExpressionConverter…

Linq to  entities ---提供语言集成查询支持用于在概念模型中定义的实体类型. 首先可以根据http://msdn.microsoft.com/en-us/data/jj206878该网页的learn去设置连接数据.从一个现有的数据库进行逆向工程的模型. 如何从数据库查询呢?通过以下简单的语句我们可以做到 using (var data = new ITshowEntities()) //连接数据 { var notice = from  变量 in 数据库.表名 where 表…

我的程序里有这么一段代码: order.OrderExpressInfo = (from oei in orderExpressRepository.Entities where oei.OrderId == order.OrderId select new EbcBuy.Bll.Orders.Models.OrderExpress { ContentInfo = oei.ContentInfo, CreatedTime = oei.CreatedTime, CreatedUserId = oe…