我只是学习 linq 并尝试使用 linq 和 ado.net 数据实体模型进行插入更新删除。现在我遇到了一些问题，当我插入一些数据时，datagridview 没有显示，我必须关闭程序并再次运行它以显示我正在输入的最新数据。这里的代码：
namespace TesDB
{
public partial class Form1 : Form
{
private Database1Entities de = new Database1Entities();
int index;
public Form1()
{
InitializeComponent();
var query = from x in de.MsEmployees
select x;
dataGridView1.DataSource = query;
dataGridView1.Refresh();
}
private void Form1_Load(object sender, EventArgs e)
{
}
public void loadtext()
{
textBox1.Text = dataGridView1.Rows[index].Cells[0].Value.ToString();
textBox2.Text = dataGridView1.Rows[index].Cells[1].Value.ToString();
textBox3.Text = dataGridView1.Rows[index].Cells[2].Value.ToString();
}
private void button2_Click(object sender, EventArgs e)
{
string EmployeeID = dataGridView1.Rows[index].Cells[0].Value.ToString();
var employee = (from x in de.MsEmployees
where x.EmployeeID == EmployeeID
select x).First();
employee.EmployeeID = textBox1.Text;
employee.EmployeeName = textBox2.Text;
employee.Salary = int.Parse(textBox3.Text);
de.SaveChanges();
Refresh();
}
private void button3_Click(object sender, EventArgs e)
{
string EmployeeID = dataGridView1.Rows[index].Cells[0].Value.ToString();
// int id1 = int.Parse(EmployeeID);
var Employee = (from x in de.MsEmployees
where x.EmployeeID == EmployeeID
select x).First();
de.MsEmployees.DeleteObject(Employee);
de.SaveChanges();
Refresh();
}
private void button1_Click(object sender, EventArgs e)
{
string employeeID = dataGridView1.Rows[index].Cells[0].Value.ToString();
var employee = (from x in de.MsEmployees
where x.EmployeeID == employeeID
select x.EmployeeID).First();
MsEmployee me = new MsEmployee();
me.EmployeeID = textBox1.Text;
me.EmployeeName = textBox2.Text;
me.Salary = int.Parse(textBox3.Text);
de.AddToMsEmployees(me);
de.SaveChanges();
this.Refresh();
}
private void dataGridView1_CellClick(object sender, DataGridViewCellEventArgs e)
{
index = e.RowIndex;
loadtext();
}
}
}
`
我将refresh()这项工作用于更新和删除，但它不适用于插入，有人知道在我完成插入后如何刷新该表吗？