一个按钮可以有多种方法？

Question

I have these 4 buttons.

truncateEmp truncateStocks truncateLogs truncateExpenses

If I press one of these, a new form will open, and will ask the user for the password from the database. If the password is correct, it will truncate the table.

The new form has two buttons, proceed and cancel . Of course, cancel , closes the form and proceed will check the user's pass if its correct, then do it's job.

Is it possible if proceed can truncate other tables? I can only truncate Employees table because proceed_Click has only one method.

private void proceed_Click(object sender, EventArgs e)   //proceed
    {

        string pass = passField.Text;
        if (pass == "")
        {
            MessageBox.Show("Did you input something? I doubt it.");
            return;
        }

        bool r = validate_login(pass);
        if (r)
        {
            db_connection();

            MySqlCommand cmd = new MySqlCommand();
            cmd.CommandText = "TRUNCATE TABLE Employees";
            cmd.Connection = connect;

            cmd.ExecuteNonQuery();
            MessageBox.Show("Success!", "TRUNCATE", MessageBoxButtons.OK, MessageBoxIcon.Information);

            emp.ShowDataToGrid();
            logs.Log_TruncateEmp();
            this.Close();
            passField.Clear();

            connect.Close();
        }
        else
        {
            MessageBox.Show("Wrong password!", "TRUNCATE", MessageBoxButtons.OK, MessageBoxIcon.Error);
            passField.Clear();
        }
    }

    private void cancel_Click(object sender, EventArgs e) //cancel
    {
        this.Close();
    }   
}

Thank you!

Answer 1

Button.Click is an event , and yes, multiple methods may be attached to such events.

The way methods work is basically that multiple actions may be executed if an event triggers. So if you have 3 methods assigned to your proceed.Click event, then all 3 will execute.

Here is an example, showing how 2 click events can be attached to a single button:

public void Form_Load(object sender, EventArgs e)
{
    proceed.Click += MyClickEvent1;
    proceed.Click += MyClickEvent2;
}

public void MyClickEvent1(object sender, EventArgs e)
{
    // Do Stuff ...
}
public void MyClickEvent2(object sender, EventArgs e)
{
    // Do More Stuff ...
}