问题描述
我想追加一组条件where子句到一个对象集的结尾。但是,条款没有得到执行,而不是原来的运行查询,例如:
I would like to append a set of conditional where clauses onto the end of an ObjectSet. However, the clauses do not get executed and instead the original query is run, for example:
using (Entities context = new Entities()){
var q = context.AuditLogs;
q.Where(o => o.WebsiteId == 1);
}
的
在不执行条款,整个结果集返回
口可以转而使用的IQueryable为:
The where clause is not executed and the full result set is returnedI could instead use IQueryAble as in:
var q = context.AuditLogs.AsQueryable();
q = q.Where(o => o.WebsiteId == 1);
然而,这失去了我能够使用.INCLUDE跃跃欲试负荷我的相关实体的能力。
However this loses me the power of being able to use .Include to eager load my related entities.
推荐答案
没有,也不会。在执行查询之前任何时候,你仍然可以将它转换回的的ObjectQuery< T> 的并调用像包含的就可以了:
No, it won't. at any point before executing the query, you would still be able to cast it back to ObjectQuery<T> and invoke methods like Include on it:
var query = context.AuditLogs.AsQueryable();
query = query.Where(o => o.WebsiteId == 1);
var auditLog = ((ObjectQuery<AuditLog>)query).Include("yourNavPropertyName")
.ToList();
如果你的目的是要逐步建立一个标准,那么其他的办法是杠杆的 EntitySQL 的用的的QueryBuilder 的方法:
If your intention is to build up a criteria incrementally, then the other option would be to leverage EntitySQL with QueryBuilder methods:
var query = context.AuditLogs.Where("it.WebsiteId = 1");
query = query.Where("...");
var auditLog = query.Include("yourNavPropertyName")
.ToList();
这篇关于如何在where子句追加到实体框架对象集的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持!