您如何将Expression<Func<T, bool>>
与实体框架查询中的CC_1进行比较?
这是我要做的示例:
Expression<Func<Errand, bool>> isClosed = (x)
=> x.ClosedDate.HasValue;
bool input = false;
var model = db.Errands
.Where(isClosed == input) // comparing to just boolean is not valid
.ToList();
您如何实现此目标?
一个选项是用方法动态创建表达式:
public Expression<Func<Errand, bool>> IsClosed(bool closed)
{
return x => x.ClosedDate.HasValue == closed;
}
并这样使用:
bool input = false;
var model = db.Errands
.Where(IsClosed(input))
.ToList();