我只是想澄清一下,我可以在插入或更新或删除后刷新datagridview而不再选择新的SQL查询吗? 我用谷歌搜索了它,但仍然不知道这样做。
这是我的代码
private void button4_Click(object sender, EventArgs e)
{
employee();
}
public void employee()
{
DataTable dtclubroom = new DataTable();
SqlCommand command = new SqlCommand();
SqlDataAdapter adapter = new SqlDataAdapter(command.CommandText, myConnection);
try
{
myConnection.Open();
dtclubroom.Clear();
command.Connection = myConnection;
command.CommandText = "Select * from employee ";
adapter.SelectCommand = command;
adapter.Fill(dtclubroom);
dataGridView2.DataSource = dtclubroom;
}
catch (Exception ex)
{
MessageBox.Show("error" + ex);
}
finally
{
myConnection.Close();
}
}
private void button5_Click(object sender, EventArgs e)
{
SqlCommand command2 = new SqlCommand();
try
{
myConnection.Open();
command2.CommandText = "insert into employee (name,id) values (@name,@id)";
command2.Connection = myConnection;
command2.Parameters.AddWithValue("@name","Leon");
command2.Parameters.AddWithValue("@id", "002");
command2.ExecuteNonQuery();
}
catch (Exception exc)
{
MessageBox.Show(exc.Message);
}
finally
{
myConnection.Close();
}
employee() //<- refresh datagridview
}
Button 4
是加载数据,button 5
插入数据也是加载数据。有没有办法刷新datagridview而不再调用employee()
方法?
答案 0 :(得分:1)
你可以通过几种方式实现。
Grid View
。Grid View
您还可以针对 DELETE 和更新
来遵循这些技巧以下是现有代码的想法#1的实现:
DataTable dtclubroom = new DataTable();
private void button4_Click(object sender, EventArgs e)
{
employee();
}
public void employee()
{
SqlCommand command = new SqlCommand();
SqlDataAdapter adapter = new SqlDataAdapter(command.CommandText, myConnection);
try
{
myConnection.Open();
dtclubroom.Clear();
command.Connection = myConnection;
command.CommandText = "Select * from employee ";
adapter.SelectCommand = command;
adapter.Fill(dtclubroom);
dataGridView2.DataSource = dtclubroom;
}
catch (Exception ex)
{
MessageBox.Show("error" + ex);
}
finally
{
myConnection.Close();
}
}
private void button5_Click(object sender, EventArgs e)
{
SqlCommand command2 = new SqlCommand();
try
{
myConnection.Open();
command2.CommandText = "insert into employee (name,id) values (@name,@id)";
command2.Connection = myConnection;
command2.Parameters.AddWithValue("@name","Leon");
command2.Parameters.AddWithValue("@id", "002");
command2.ExecuteNonQuery();
DataRow dr = dtclubroom.NewRow();
dr["name"] = "Leon";
dr["id"] = "002";
dtclubroom.Rows.Add(dr);
}
catch (Exception exc)
{
MessageBox.Show(exc.Message);
}
finally
{
myConnection.Close();
}
dataGridView2.DataSource = dtclubroom; //<- refresh datagridview
}
看看数据表声明已向上移动,您需要将其放在班级的顶部:
DataTable dtclubroom = new DataTable();
没有其他东西需要全球化。