实体框架日期解析

Question

我正在尝试进行LINQ to Entities查询(我仍然非常熟悉EF并且我正在学习它比LinqToSQL差异化)并且我正在尝试做这样的事情:

DateTime begin = new DateTime(2011, 1, 1);

Apps = (from app in context.Instances
                 where app.ReleaseDate.Date == begin
                 select new ScalpApp
                 {
                 Image = app.Image,
                 PublisherName = app.PublisherName,
                 }).ToList();

虽然这在LinqPad中有效,但它不在我的代码中.抛出的异常是:

The specified type member 'Date' is not supported in LINQ to Entities.

仅支持初始值设定项,实体成员和实体导航属性.

我如何在LinqToEF中执行此操作？DB中的字段是完整的DateTime(带有时间码),我试图仅根据日期进行解析.

Answer 1

你不能简单地使用'app.ReleaseDate.Data',但你可以:

var begin = new DateTime(2011, 1, 1);
var end = begin.AddHours(24);

Apps = (from app in context.Instances
             where 
               (app.ReleaseDate >= begin) and
               (app.ReleaseDate < end)
             select new ScalpApp
             {
             Image = app.Image,
             PublisherName = app.PublisherName,
             }).ToList();