的LINQ to SQL比較時只

Question

我怎麼沒有得到比較只是DateTime對象時以下

錯誤：

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. 

我的代碼：

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

Answer 1

這就是答案！

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

您是否嘗試過使用函數EntityFunctions.TruncateTime（TIME）？

它會去如下：

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

希望這有助於！