添加的值不显示在 Gridview 上？ C＃

Question

我是编程世界和 Stack Overflow 的新手，所以请原谅“菜鸟”的问题。

我在这里有这个方法（链接到 Windows 窗体），想法是将信息添加到文本框并将其添加到 Gridview 和数据库中。问题是添加的信息中只有一部分（自动生成的 ID）显示在（ID）上

 private void btnAddNewAdmin_Click(object sender, EventArgs e)
        {
            if (!(txtAdminFname.Text == string.Empty || txtAdminLname.Text == string.Empty ||
                  txtPassword.Text == string.Empty))
            {
                MessageBox.Show("ERROR: all the boxes have to be filled and try again.");
            }
            // Here it will ADD a new Admin based on the information entered in the form, the New ID for the Admin is generated by the program.
                try
                {
                using (Hawthor_HS_Entities db = new Hawthor_HS_Entities())
                {
                    Administrator addAdministrator = new Administrator();// currently adding only the AID and nothing else.
                    {
                        addAdministrator.FName = txtAdminFname.Text;
                        addAdministrator.LName = txtAdminLname.Text;
                        addAdministrator.Password = txtNewPass.Text;
                    }

                        db.Administrators.Add(addAdministrator);
                        db.SaveChanges();

                        DataGridLoad();

                        MessageBox.Show("Success! New Administrator was Added");
                    }

                }
                catch (Exception)
                {
                    MessageBox.Show("Error: Could not Add new Administrator. Please try again.");
                }
            }

我也有一个“编辑”方法，一旦创建了该行（只有 ID），它似乎工作得很好。

这里是 DataGridLoad()

private void DataGridLoad()
        {
            using (Hawthor_HS_Entities db = new Hawthor_HS_Entities())
            {
                // Loads information into the DataGridView from the Administrators db.
                var adminLIST = (from c in db.Administrators
                    select new
                    {
                        AID = c.AID,
                        FirstName = c.FName,
                        LastName = c.LName
                    }).ToList();

                ADDdataGridView.DataSource = adminLIST;


                // loads information into the AdminID combo box in the EDIT tab.
                cboAdminID.DisplayMember = "AID";
                cboAdminID.ValueMember = "AID";
                cboAdminID.DataSource = adminLIST;

                //loads information into the AID combo box in the DELETE tab.
                cboAID.DisplayMember = "AID";
                cboAID.ValueMember = "AID";
                cboAID.DataSource = adminLIST;
            }
        }

Answer 1

根据您的评论，您在数据库中成功获取数据，但无法正确加载数据，所以

让我分享一个例子，也许它会对你有所帮助。如果没有，请告诉我，

您可以使用以下代码加载您的datagridview

var context=new Hawthor_HS_Entities();
BindingSource bi = new BindingSource();
bi.DataSource = context.Administrators;
dataGridView1.DataSource = bi;
dataGridView1.Refresh();

Answer 2

在执行SaveChanges() 之后，您可以从模型类中获取ID。在您的情况下，您可以从addAdministrator 对象中获取ID，例如

try
{
    using (Hawthor_HS_Entities db = new Hawthor_HS_Entities())
    {
        Administrator addAdministrator = new Administrator();// currently adding only the AID and nothing else.
        {
            addAdministrator.FName = txtAdminFname.Text;
            addAdministrator.LName = txtAdminLname.Text;
            addAdministrator.Password = txtNewPass.Text;
        }

        db.Administrators.Add(addAdministrator);
        db.SaveChanges();
        DataGridLoad();
        int Id = addAdministrator.ID; // you can able to get the id for the record you attempt to save.
        MessageBox.Show("Success! New Administrator was Added");
    }
}
catch (Exception)
{
    MessageBox.Show("Error: Could not Add new Administrator. Please try again.");
}