如何使用Entity Framework將數據從多個表綁定到datagridview並使用CRUD操作？

Question

有人可以舉例說明如何將結果綁定到實體框架中從多個表（來自連接查詢）獲取的datagridview。 實際上，我可以將數據綁定到datagridview但是當我調用時

context.SaveChanges（）; 數據庫中沒有更新任何內容。 如何使用Update，Insert，Delete函數將數據正確綁定到datagridview。

這是我試過的。

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";

提前致謝。

Answer 1

在給出查詢結果之后，你應該這樣寫：

...

BindingSource bi = new BindingSource();
bi.DataSource = query.ToList();
dataGridView1.DataSource = bi;
dataGridView1.Refresh();

...