Linq To Sql仅比较时间

Question

如何在不获取以下内容的情况下比较DateTime对象的时间

错误：

An exception of type 'System.NotSupportedException' occurred in mscorlib.dll but was not handled in user code Additional information: The specified type member 'TimeOfDay' is not supported in LINQ to Entities. Only initializers, entity members, and entity navigation properties are supported.

我的代码：

var date = DateTime.Parse(query.DueTime);
entities = entities.Where(r => r.DueTime.TimeOfDay.Equals(date.TimeOfDay));

Answer 1

这就是答案！

var date = DateTime.Parse(query.DueTime);
var time = date.TimeOfDay;
entities = entities.Where(r => DbFunctions.CreateTime(r.DueTime.Hour, r.DueTime.Minute,  r.DueTime.Second) == time);

Answer 2

您是否尝试过使用EntityFunctions.TruncateTime（TIME）函数？

它将如下：

var date = DateTime.Parse(query.DueTime);
entities = entities.Where(r => EntityFunctions.TruncateTime(r.DueTime) == EntityFunctions.TruncateTime(date));

希望这有帮助！