C# 如何使用Linq筛选主明细关系的明细记录
我已经编写了自己的对象来表示我的SQL表,并包括外键关系,如下所示C# 如何使用Linq筛选主明细关系的明细记录,c#,sql,linq,C#,Sql,Linq,我已经编写了自己的对象来表示我的SQL表,并包括外键关系,如下所示 [Table(Name = "tbl_employee")] public class employee { private EntitySet<workDay> _hours; public employee() { this._hours = new EntitySet<workDay>(OnDtlAdded, OnDtlremoved); }
[Table(Name = "tbl_employee")]
public class employee
{
private EntitySet<workDay> _hours;
public employee()
{
this._hours = new EntitySet<workDay>(OnDtlAdded, OnDtlremoved);
}
private void OnDtlAdded(workDay addedDtl) { addedDtl.Employee = this; }
private void OnDtlremoved(workDay removedDtl) { removedDtl.Employee = null; }
[Association(ThisKey = "employeeID", Storage = "_hours", OtherKey = "employeeID")]
public EntitySet<workDay> Hours
{
get { return this._hours; }
set { this._hours.Assign(value); }
}
[Column(IsPrimaryKey = true, IsDbGenerated = true)]
public Int32 employeeID { get; set; }
[Column]
public String firstName { get; set; }
[Column]
public String nickName { get; set; }
[Column]
public String lastName { get; set; }
[Column]
public String idNumber { get; set; }
}
这允许我显示每个员工的小时数,而无需进一步编码。我希望获得相同的结果,但将小时数过滤到某个日期范围,我想知道是否有任何方法可以应用默认过滤器,当详细信息加载到“detail”dataGridView时可以应用该过滤器。我已经放弃了这一点,因为我找不到实现它的方法。此外,似乎没有其他人知道如何做到这一点,也没有人研究过这个问题,或者这实际上是不可能的。感谢那些花时间或精力试图解决这个问题的人 此后,我在选择主datagridview中的一行时实现了过滤
var employees = from emp in db.Employees
join empd in db.EmploymentDtls on emp.employeeID equals empd.employeeID
where empd.termination == null && empd.deleted == 0 && emp.deleted == 0
select emp;
dgvEmployees.DataSource = employees;
dgvHours.DataSource = employees;
dgvHours.DataMember = "Hours";