c# - 如何编写 LINQ to SQL 查询以获取今天的日期记录？

Question

我想使用 LINQ to SQL 获取今天输入的记录。我写了下面的代码，但它也返回了以前的日期记录。

DateTime todaysDate = DateTime.Now;
DateTime yesterdaysDate = DateTime.Now.AddDays(-1);

var result = (from a in cxt.visitor.OrderByDescending(n => n.singin)
              where (a.singin > yesterdaysDate && a.singin <= todaysDate)
              select new {a.visitorid, a.visitorname, a.visitingperson, a.phonenumber, a.reasonforvisit, a.signature, a.singin });

您能告诉我如何仅使用 LINQ to SQL 获取今天输入的记录吗？

Answer 1

使用DateTime.Now方法DateTime.Today如：

DateTime startDateTime = DateTime.Today; //Today at 00:00:00
DateTime endDateTime = DateTime.Today.AddDays(1).AddTicks(-1); //Today at 23:59:59

var result = (from a in cxt.visitor.OrderByDescending(n => n.singin)
            where (a.singin >= startDateTime && a.singin <= endDateTime)
            select new {a.visitorid, a.visitorname, a.visitingperson, a.phonenumber, a.reasonforvisit, a.signature, a.singin });

或者您可以尝试以下更简单的版本，（我不确定这是否会转化为 SQL）

var result = (from a in cxt.visitor.OrderByDescending(n => n.singin)
            where (a.singin.Date == DateTime.Today)
            select new {a.visitorid, a.visitorname, a.visitingperson, a.phonenumber, a.reasonforvisit, a.signature, a.singin });