Csharp/C Sharp/GUI Windows Form/Thread and UI
Содержание
Background processing in a thread.
<source lang="csharp">
using System; using System.Drawing; using System.Collections; using System.ruponentModel; using System.Windows.Forms; using System.Data; using System.Threading; public class Form1 : System.Windows.Forms.Form {
private System.Windows.Forms.Label label1;
private System.Windows.Forms.Button button1;
private System.Windows.Forms.Label ValueLabel;
private System.Windows.Forms.Button button2;
private System.ruponentModel.Container components = null;
private Thread fThread;
private int fValue;
public Form1() {
fValue = 0;
this.label1 = new System.Windows.Forms.Label();
this.button1 = new System.Windows.Forms.Button();
this.ValueLabel = new System.Windows.Forms.Label();
this.button2 = new System.Windows.Forms.Button();
this.SuspendLayout();
this.label1.Location = new System.Drawing.Point(24, 32);
this.label1.Size = new System.Drawing.Size(80, 16);
this.label1.Text = "Value of Data:";
this.button1.Location = new System.Drawing.Point(232, 32);
this.button1.Text = "&Update";
this.button1.Click += new
System.EventHandler(this.button1_Click);
this.ValueLabel.Location = new System.Drawing.Point(120, 32);
this.button2.Location = new System.Drawing.Point(104, 88);
this.button2.Name = "button2";
this.button2.RightToLeft =
System.Windows.Forms.RightToLeft.No;
this.button2.Size = new System.Drawing.Size(96, 23);
this.button2.Text = "Start Thread";
this.button2.Click += new
System.EventHandler(this.button2_Click);
this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
this.ClientSize = new System.Drawing.Size(336, 141);
this.Controls.AddRange(new System.Windows.Forms.Control[] {
this.button2,
this.ValueLabel,
this.button1,
this.label1});
this.ResumeLayout(false);
}
[STAThread]
static void Main() {
Application.Run(new Form1());
}
private void ThreadProc() {
while (fValue < 1000) {
Thread.Sleep(1000);
fValue++;
}
}
private void button2_Click(object sender, System.EventArgs e) {
fThread = new Thread(new ThreadStart(ThreadProc));
fThread.IsBackground = true;
fThread.Start();
}
private void button1_Click(object sender, System.EventArgs e) {
this.ValueLabel.Text = fValue.ToString();
}
}
</source>
Starting and stopping a thread.
<source lang="csharp"> using System; using System.Drawing; using System.Collections; using System.ruponentModel; using System.Windows.Forms; using System.Data; using System.Threading; public class Form1 : System.Windows.Forms.Form {
private System.Windows.Forms.Button button1;
private System.Windows.Forms.Button button2;
private System.Windows.Forms.Label label1;
private System.Windows.Forms.Label label2;
private System.Windows.Forms.Label NumThreads;
private System.Windows.Forms.Label Counter;
private int fCounter;
private ArrayList fThreadList;
private System.ruponentModel.Container components = null;
public Form1() {
InitializeComponent();
fThreadList = new ArrayList();
}
protected override void Dispose(bool disposing) {
if (disposing) {
if (components != null) {
components.Dispose();
for (int i = 0; i < fThreadList.Count; ++i) {
Thread fThread = (Thread)fThreadList[i];
fThread.Abort();
}
}
}
base.Dispose(disposing);
}
private void InitializeComponent() {
this.button1 = new System.Windows.Forms.Button();
this.button2 = new System.Windows.Forms.Button();
this.label1 = new System.Windows.Forms.Label();
this.label2 = new System.Windows.Forms.Label();
this.NumThreads = new System.Windows.Forms.Label();
this.Counter = new System.Windows.Forms.Label();
this.SuspendLayout();
this.button1.Location = new System.Drawing.Point(32, 104);
this.button1.Name = "button1";
this.button1.TabIndex = 0;
this.button1.Text = "&Start";
this.button1.Click += new
System.EventHandler(this.button1_Click);
this.button2.Location = new System.Drawing.Point(136, 104);
this.button2.Name = "button2";
this.button2.Size = new System.Drawing.Size(88, 24);
this.button2.TabIndex = 1;
this.button2.Text = "&Stop";
this.button2.Click += new
System.EventHandler(this.button2_Click);
this.label1.Location = new System.Drawing.Point(32, 40);
this.label1.Name = "label1";
this.label1.Size = new System.Drawing.Size(152, 16);
this.label1.TabIndex = 2;
this.label1.Text = "Number of Threads Running:";
this.label2.Location = new System.Drawing.Point(32, 64);
this.label2.Name = "label2";
this.label2.Size = new System.Drawing.Size(100, 16);
this.label2.TabIndex = 3;
this.label2.Text = "Counter:";
this.NumThreads.Location = new System.Drawing.Point(192, 40);
this.NumThreads.Name = "NumThreads";
this.NumThreads.Size = new System.Drawing.Size(64, 16);
this.NumThreads.TabIndex = 4;
this.Counter.Location = new System.Drawing.Point(192, 64);
this.Counter.Name = "Counter";
this.Counter.Size = new System.Drawing.Size(64, 16);
this.Counter.TabIndex = 5;
this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
this.ClientSize = new System.Drawing.Size(272, 165);
this.Controls.AddRange(new System.Windows.Forms.Control[] {
this.Counter,
this.NumThreads,
this.label2,
this.label1,
this.button2,
this.button1});
this.ResumeLayout(false);
}
[STAThread]
static void Main() {
Application.Run(new Form1());
}
protected void ThreadFunc() {
Boolean done = false;
while (!done) {
Thread.Sleep(1000);
fCounter++;
this.Counter.Text = fCounter.ToString();
}
}
private void button1_Click(object sender, System.EventArgs e) {
Thread fThread = new Thread(new ThreadStart(ThreadFunc));
fThread.Start();
fThreadList.Add(fThread);
this.NumThreads.Text = fThreadList.Count.ToString();
}
private void button2_Click(object sender, System.EventArgs e) {
Thread fThread = (Thread)fThreadList[fThreadList.Count - 1];
fThread.Abort();
fThreadList.Remove(fThread);
this.NumThreads.Text = fThreadList.Count.ToString();
}
}
</source>
Talking to a visual element in a background thread.
<source lang="csharp">
using System; using System.Drawing; using System.Collections; using System.ruponentModel; using System.Windows.Forms; using System.Data; using System.Threading; public class Form1 : System.Windows.Forms.Form {
private System.Windows.Forms.ProgressBar progressBar1;
private System.Windows.Forms.Button button1;
private System.Windows.Forms.Button button2;
private Thread fThread = null;
private System.ruponentModel.Container components = null;
public Form1() {
this.progressBar1 = new System.Windows.Forms.ProgressBar();
this.button1 = new System.Windows.Forms.Button();
this.button2 = new System.Windows.Forms.Button();
this.SuspendLayout();
this.progressBar1.Location = new System.Drawing.Point(24, 32);
this.progressBar1.Name = "progressBar1";
this.progressBar1.Size = new System.Drawing.Size(264, 23);
this.progressBar1.TabIndex = 0;
this.button1.Location = new System.Drawing.Point(24, 80);
this.button1.Size = new System.Drawing.Size(136, 40);
this.button1.Text = "Start Thread";
this.button1.Click += new
System.EventHandler(this.button1_Click);
this.button2.Location = new System.Drawing.Point(168, 80);
this.button2.Size = new System.Drawing.Size(120, 40);
this.button2.Text = "Stop Thread";
this.button2.Click += new
System.EventHandler(this.button2_Click);
this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
this.ClientSize = new System.Drawing.Size(704, 429);
this.Controls.AddRange(new System.Windows.Forms.Control[] {
this.button2,
this.button1,
this.progressBar1});
this.ResumeLayout(false);
}
protected override void Dispose(bool disposing) {
if (fThread != null) {
fThread.Interrupt();
fThread = null;
}
}
[STAThread]
static void Main() {
Application.Run(new Form1());
}
private void UpdateProgress() {
if (progressBar1.Value == progressBar1.Maximum) {
progressBar1.Value = progressBar1.Minimum;
}
progressBar1.PerformStep();
}
public void ThreadProc() {
try {
MethodInvoker mi = new MethodInvoker(this.UpdateProgress);
while (true) {
this.BeginInvoke(mi);
Thread.Sleep(500);
}
} catch (ThreadInterruptedException e) {
Console.WriteLine(
"Interruption Exception in Thread: {0}",
e);
} catch (Exception we) {
Console.WriteLine("Exception in Thread: {0}", we);
}
}
private void button1_Click(object sender, System.EventArgs e) {
fThread = new Thread(new ThreadStart(ThreadProc));
fThread.IsBackground = true;
fThread.Start();
}
private void button2_Click(object sender, System.EventArgs e) {
fThread.Interrupt();
fThread = null;
}
}
</source>
Thread and UI Demo
<source lang="csharp"> using System; using System.Threading; using System.Drawing; using System.Collections; using System.ruponentModel; using System.Windows.Forms; using System.Data; public struct MyData {
public double pi; public int iters;
} public class Calc {
private double _pi;
private int _iters;
private readonly int TotalIters;
public Calc(int it) {
_iters = 1;
_pi = 0;
TotalIters = it;
}
public MyData PI {
get {
MyData pi = new MyData();
lock (this) {
pi.pi = _pi;
pi.iters = _iters;
}
return pi;
}
}
public Thread MakeThread() {
return new Thread(new ThreadStart(this.ThreadStarter));
}
private void calculate() {
double series = 0;
do {
series ++;
lock (this) {
_iters += 4;
_pi = series * 4;
}
} while (_iters < TotalIters);
}
private void ThreadStarter() {
try {
calculate();
} catch (ThreadAbortException e) {
Console.WriteLine("ThreadAbortException");
}
}
} public class Form1 : System.Windows.Forms.Form {
private System.Windows.Forms.Label label1;
private System.Windows.Forms.TextBox PiValue;
private System.Windows.Forms.Label label2;
private System.Windows.Forms.TextBox Iteratons;
private Calc pi = new Calc(100000000);
private Thread calcThread = null;
private System.Windows.Forms.Timer timer1;
private System.Windows.Forms.Button StopButton;
private System.Windows.Forms.Button Pause;
private System.ruponentModel.IContainer components;
public Form1() {
this.label1 = new System.Windows.Forms.Label();
this.label2 = new System.Windows.Forms.Label();
this.Pause = new System.Windows.Forms.Button();
this.PiValue = new System.Windows.Forms.TextBox();
this.StopButton = new System.Windows.Forms.Button();
this.timer1 = new System.Windows.Forms.Timer(this.ruponents);
this.Iteratons = new System.Windows.Forms.TextBox();
this.SuspendLayout();
//
// label1
//
this.label1.Location = new System.Drawing.Point(8, 24);
this.label1.Name = "label1";
this.label1.TabIndex = 0;
this.label1.Text = "Value of PI:";
//
// label2
//
this.label2.Location = new System.Drawing.Point(8, 72);
this.label2.Name = "label2";
this.label2.TabIndex = 2;
this.label2.Text = "Iterations:";
//
// Pause
//
this.Pause.Location = new System.Drawing.Point(24, 112);
this.Pause.Name = "Pause";
this.Pause.TabIndex = 5;
this.Pause.Text = "Pause";
this.Pause.Click += new System.EventHandler(this.Pause_Click);
//
// PiValue
//
this.PiValue.Location = new System.Drawing.Point(128, 24);
this.PiValue.Name = "PiValue";
this.PiValue.ReadOnly = true;
this.PiValue.Size = new System.Drawing.Size(136, 20);
this.PiValue.TabIndex = 1;
this.PiValue.Text = "";
//
// StopButton
//
this.StopButton.Location = new System.Drawing.Point(200, 112);
this.StopButton.Name = "StopButton";
this.StopButton.TabIndex = 4;
this.StopButton.Text = "Stop";
this.StopButton.Click += new System.EventHandler(this.StopButton_Click);
//
this.timer1.Enabled = true;
this.timer1.Tick += new System.EventHandler(this.timer1_Tick);
//
this.Iteratons.Location = new System.Drawing.Point(128, 72);
this.Iteratons.Name = "Iteratons";
this.Iteratons.ReadOnly = true;
this.Iteratons.TabIndex = 3;
this.Iteratons.Text = "";
//
this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
this.ClientSize = new System.Drawing.Size(292, 149);
this.Controls.AddRange(new System.Windows.Forms.Control[] {
this.Pause,
this.StopButton,
this.Iteratons,
this.label2,
this.PiValue,
this.label1});
this.Load += new System.EventHandler(this.Form1_Load);
this.Closed += new System.EventHandler(this.Form1_Closed);
this.ResumeLayout(false);
}
[STAThread]
static void Main() {
Application.Run(new Form1());
}
private void Form1_Load(object sender, System.EventArgs e) {
calcThread = pi.MakeThread();
calcThread.Priority = ThreadPriority.Lowest;
calcThread.Start();
}
private void timer1_Tick(object sender, System.EventArgs e) {
if (this.Pause.Text == "Pause") {
MyData p = pi.PI;
this.PiValue.Text = p.pi.ToString();
this.Iteratons.Text = p.iters.ToString();
}
if (calcThread.IsAlive == false) {
StopButton.Enabled = false;
Pause.Enabled = false;
timer1.Enabled = false;
calcThread = null;
}
}
private void StopButton_Click(object sender, System.EventArgs e) {
StopButton.Enabled = false;
Pause.Enabled = false;
timer1.Enabled = false;
calcThread.Abort();
calcThread.Join();
calcThread = null;
}
private void Pause_Click(object sender, System.EventArgs e) {
if (this.Pause.Text == "Pause") {
calcThread.Suspend();
this.Pause.Text = "Resume";
this.StopButton.Enabled = false;
} else {
calcThread.Resume();
this.Pause.Text = "Pause";
this.StopButton.Enabled = true;
}
}
private void Form1_Closed(object sender, System.EventArgs e) {
if (calcThread != null) {
calcThread.Abort();
calcThread.Join();
}
}
}
</source>
