如何使用Entity Framework将数据从连接查询绑定到datagridview？

Question

有人可以举例说明如何将结果绑定到实体框架中从多个表（来自连接查询）获取的datagridview。 实际上我可以将数据绑定到datagridview但是当我调用

时

context.SaveChanges();

数据库中没有更新任何内容。如何使用Update，Insert，Delete函数将数据正确绑定到datagridview。

这就是我的尝试。

public class DataBindingProjection
{
    public string dono { get; set; }
    public int apmntid { get; set; }
    public string servicedesc { get; set; }
    public string cusid { get; set; }
    public string empid { get; set; 
    public bool isdelivered { get; set; }
}


context = new HHCSEntities();

var query = from d in context.DeliveryOrders
            join a in context.Appointments on d.ApmntId equals a.ApmntId
            join s in context.ServiceCategories on d.ServiceId equals s.ServiceId
            join e in context.Employees on d.EmpId equals e.EmpId
            select new DataBindingProjection
            {
                dono = d.DONo,
                apmntid = a.ApmntId,
                servicedesc = s.ServiceDesc,
                cusid = a.CusId,
                empid = d.EmpId,
                shortname = e.ShrtName,
                isdelivered = d.IsDelivered
            };

dataGridView1.DataSource = query.ToList();
dataGridView1.Columns[1].DataPropertyName = "dono";
dataGridView1.Columns[2].DataPropertyName = "apmntid";
dataGridView1.Columns[3].DataPropertyName = "servicedesc";
dataGridView1.Columns[4].DataPropertyName = "apmntid";
dataGridView1.Columns[5].DataPropertyName = "empid";
dataGridView1.Columns[9].DataPropertyName = "isdelivered";

提前致谢。