entity-framework - 在 Entity SQL 中比较日期

Question

比较日期的正确 eSQL 语法是什么？

等效的 LINQ-to-Entities 表达式如下所示：

var lastYearsShipments = from p in MyDataServiceContext.Products
                         where p.ShipDate.Value.Year == DateTime.Now.Year - 1
                         select p;

Answer 1

他们说回答你自己的问题是可以接受的，所以这里......

var predicate = string.Format(
    "Year(it.ShipDate) == Year(cast('{0}' as System.DateTime)) -1",
    System.DateTime.Now);

var lastYearsShipments = 
    myQuery.Products.Where(predicate); // myQuery is type ObjectQuery<T>

另请参阅：msdn 文档

Answer 2

string datetimeFormatter = "yyyy-MM-dd HH:mm";

var predicate = string.Format("Year(it.ShipDate) == Year(DATETIME'{0}')) -1", System.DateTime.Now.ToString(datetimeFormatter)); 

var lastYearsShipments = myQuery.Products.Where(predicate);