I've searched many topics but I can't seem to understand how to replace my existing methods with delegation+timer as I am currently using timer only. Also when adding BackgroundWorker to work with btng that moves the elevator down and opens the doors I get a multi-thread usage error stating that another thread is trying to insertdata in the .accdb where the main thread is recorded. I am adding the code which is not very long but fully working. Could someone give me a hint how to replace my existing methods with delegation and add one or two BackgroundWorkers to help the buttons that move the elevator and still keep the timers, please.
P.S. Do I need to share/change the database connection code in order to make it work with the backgroundworker? I'll add it if necessary. It's another couple of more lines..
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.Speech;
using System.Speech.Synthesis;
using System.Data.OleDb;
namespace rewrite
{
public partial class Form1 : Form
{
//variables
int y_up = 63;
int y_down = 376;
int x_door_left_close = 74;
int x_door_left_open = 12;
int x_door_right_close = 139;
int x_door_right_open = 200;
bool go_up = false;
bool go_down = false;
bool arrived_G = false;
bool arrived_1 = false;
//object
SpeechSynthesizer reader = new SpeechSynthesizer();
public Form1()
{
InitializeComponent();
}
private void timerliftdown_Tick(object sender, EventArgs e)
{
if (picturelift.Top <= y_down)
{
picturelift.Top += 1;
}
else
{
timerliftdown.Enabled = false;
btnup.Enabled = true;
btn1.Enabled = true;
btnclose.Enabled = true;
btnopen.Enabled = true;
btndown.BackColor = Color.Red;
btng.BackColor = Color.Red;
dooropendown();
arrived_G = true;
picturelift.Image = global::rewrite.Properties.Resources.Inside_of_the_lift;
displaypanel.Image = global::rewrite.Properties.Resources.G;
displaytop.Image = global::rewrite.Properties.Resources.G;
displaybottom.Image = global::rewrite.Properties.Resources.G;
}
}
private void timerliftup_Tick(object sender, EventArgs e)
{
if (picturelift.Top >= y_up)
{
picturelift.Top -= 1;
}
else
{
timerliftup.Enabled = false;
btndown.Enabled = true;
btng.Enabled = true;
btnclose.Enabled = true;
btnopen.Enabled = true;
btnup.BackColor = Color.Red;
btn1.BackColor = Color.Red;
dooropenup();
arrived_1 = true;
picturelift.Image = global::rewrite.Properties.Resources.Inside_of_the_lift;
displaypanel.Image = global::rewrite.Properties.Resources._1;
displaytop.Image = global::rewrite.Properties.Resources._1;
displaybottom.Image = global::rewrite.Properties.Resources._1;
}
}
private void dooropendown_Tick(object sender, EventArgs e)
{
if (doorleftdown.Left >= x_door_left_open && doorrightdown.Left <= x_door_right_open)
{
doorleftdown.Left -= 1;
doorrightdown.Left += 1;
}
else
{
timerdooropendown.Enabled = false;
}
}
private void timerdoorclosedown_Tick(object sender, EventArgs e)
{
if (doorleftdown.Left <= x_door_left_close && doorrightdown.Left >= x_door_right_close)
{
doorleftdown.Left += 1;
doorrightdown.Left -= 1;
}
else
{
timerdoorclosedown.Enabled = false;
if (go_up == true)
{
picturelift.Image = global::rewrite.Properties.Resources.lift_transparent;
displaypanel.Image = global::rewrite.Properties.Resources.up;
displaytop.Image = global::rewrite.Properties.Resources.up;
displaybottom.Image = global::rewrite.Properties.Resources.up;
reader.Speak("Going up");
timerliftup.Enabled = true;
go_up = false;
}
}
}
private void dooropenup_Tick(object sender, EventArgs e)
{
if (doorleftup.Left >= x_door_left_open && doorrightup.Left <= x_door_right_open)
{
doorleftup.Left -= 1;
doorrightup.Left += 1;
}
else
{
timerdooropenup.Enabled = false;
}
}
private void timerdoorcloseup_Tick(object sender, EventArgs e)
{
if (doorleftup.Left <= x_door_left_close && doorrightup.Left >= x_door_right_close)
{
doorleftup.Left += 1;
doorrightup.Left -= 1;
}
else
{
timerdoorcloseup.Enabled = false;
if (go_down == true)
{
picturelift.Image = global::rewrite.Properties.Resources.lift_transparent;
displaypanel.Image = global::rewrite.Properties.Resources.down;
displaytop.Image = global::rewrite.Properties.Resources.down;
displaybottom.Image = global::rewrite.Properties.Resources.down;
reader.Speak("Going down");
timerliftdown.Enabled = true;
go_down = false;
}
}
}
private void doorclosedown()
{
reader.Speak("doors closing");
insertdata("door closing @Ground floor");
timerdoorclosedown.Enabled = true;
timerdooropenup.Enabled = false;
}
private void dooropendown()
{
reader.Speak("Ground floor, doors opening");
insertdata("doors opening @Ground floor");
timerdoorclosedown.Enabled = false;
timerdooropendown.Enabled = true;
}
private void doorcloseup()
{
reader.Speak("doors closing");
insertdata("Doors closing @First Floor");
timerdoorcloseup.Enabled = true;
timerdooropenup.Enabled = false;
}
private void dooropenup()
{
reader.Speak("First Floor, doors opening");
insertdata("Doors Opening @First Floor");
timerdoorcloseup.Enabled = false;
timerdooropenup.Enabled = true;
}
private void going_up()
{
go_up = true;
doorclosedown();
btng.Enabled = false;
btndown.Enabled = false;
btnclose.Enabled = false;
btnopen.Enabled = false;
arrived_G = false;
insertdata("Lift going up");
}
private void going_down()
{
go_down = true;
doorcloseup();
btn1.Enabled = false;
btnup.Enabled = false;
btnclose.Enabled = false;
btnopen.Enabled = false;
arrived_1 = false;
insertdata("Lift going down");
}
private void btndown_Click(object sender, EventArgs e)
{
btnup.BackColor = Color.DarkCyan;
going_up();
}
private void btnup_Click(object sender, EventArgs e)
{
btndown.BackColor = Color.DarkCyan;
going_down();
}
private void btn1_Click(object sender, EventArgs e)
{
btn1.BackColor = Color.DarkCyan;
going_up();
}
private void btng_Click(object sender, EventArgs e)
{
btng.BackColor = Color.DarkOrange;
going_down();
}
private void btnclose_Click(object sender, EventArgs e)
{
if (arrived_G == true)
{
doorclosedown();
}
else if (arrived_1 == true)
{
doorcloseup();
}
}
private void btnopen_Click(object sender, EventArgs e)
{
if (arrived_G == true)
{
dooropendown();
}
else if (arrived_1 == true)
{
dooropenup();
}
}
private void btnalarm_Click(object sender, EventArgs e)
{
btnalarm.BackColor = Color.Green;
reader.Speak("Emergency Stop. Please exit carefully.");
insertdata("Emergency Stop!");
timerliftdown.Enabled = false;
timerliftup.Enabled = false;
timerdooropendown.Enabled = true;
timerdooropenup.Enabled = true;
displaypanel.Image = global::rewrite.Properties.Resources.alarmbellbutton;
displaytop.Image = global::rewrite.Properties.Resources.alarmbellbutton;
displaybottom.Image = global::rewrite.Properties.Resources.alarmbellbutton;
}
To those that might come back after all this time, I already did it using this this.bw = new BackgroundWorker(); this.bw.DoWork += new DoWorkEventHandler(bw_DoWork); this.bw.ProgressChanged += new ProgressChangedEventHandler(bw_ProgressChanged); this.bw.RunWorkerCompleted += new RunWorkerCompletedEventHandler(bw_RunWorkerCompleted); this.bw.WorkerReportsProgress = true; this.button1.Click += new EventHandler(button1_Click); and then i added the object senders for the EventArgs for the backgroundworker processes