我正在整理一个简单的WinForm，它会产生许多线程，从0到10000循环 - 这样做的目的 - 减慢Windows以使其他程序运行缓慢。
基本上，表单有一个文本框，我想从每个线程写入循环索引。对于单个线程来说一切都很好，但是因为我引入了更多的线程，所以当我点击“停止”按钮时，我似乎会挂起应用程序 - 我不太确定从哪里开始。
我的样本可能写得不好。我希望更好地了解多线程，死锁等等。我过去曾经使用过BackgroundWorker，但是在过去2年多的时间里，我一直在使用Java。
Form1.cs的
public delegate void SetTextDelegate(string text);
public partial class Form1 : Form
{
private Thread[] _slow;
private object lockTextBox = new object();
public Form1()
{
InitializeComponent();
}
#region Event Handlers
private void ui_btnClose_Click(object sender, EventArgs e)
{
this.Close();
}
private void Form1_Load(object sender, EventArgs e)
{
}
private void ui_btnStart_Click(object sender, EventArgs e)
{
if (_slow != null)
{
StopAllThreads();
}
_slow = new Thread[ (int) numNoOfTheads.Value ];
for( int i = 0; i < numNoOfTheads.Value; i++)
{
_slow[i] = new Thread(ThreadRunLoop);
_slow[i].Start();
}
}
private void Form1_FormClosing(object sender, FormClosingEventArgs e)
{
if (_slow != null)
{
StopAllThreads();
}
}
private void ui_btnStop_Click(object sender, EventArgs e)
{
if (_slow != null)
{
StopAllThreads();
}
}
private void ui_btnClear_Click(object sender, EventArgs e)
{
this.textBox1.Clear();
}
#endregion
protected void ThreadRunLoop()
{
try
{
for (int i = 0; i < 10000; i++)
{
UpdateText("Loop " + i + " for " + Thread.CurrentThread.ManagedThreadId);
}
}
catch (ThreadInterruptedException ex)
{
Console.WriteLine("Thread has been interrupted.");
}
}
private void UpdateText(string text)
{
//lock (lockTextBox)
//{
if (textBox1.InvokeRequired)
{
textBox1.Invoke(new SetTextDelegate(UpdateText), text);
}
else
{
textBox1.SuspendLayout();
textBox1.Text = textBox1.Text + text + System.Environment.NewLine;
textBox1.SelectionStart = textBox1.Text.Length;
textBox1.ScrollToCaret();
textBox1.ResumeLayout();
}
//}
}
private void StopAllThreads()
{
for (int i = 0; i < _slow.Length; i++)
{
if (_slow[i] != null)
{
_slow[i].Interrupt();
_slow[i] = null;
}
}
_slow = null;
}
}
Form1.Designer.cs
partial class Form1
{
/// <summary>
/// Required designer variable.
/// </summary>
private System.ComponentModel.IContainer components = null;
/// <summary>
/// Clean up any resources being used.
/// </summary>
/// <param name="disposing">true if managed resources should be disposed; otherwise, false.</param>
protected override void Dispose(bool disposing)
{
if (disposing && (components != null))
{
components.Dispose();
}
base.Dispose(disposing);
}
#region Windows Form Designer generated code
/// <summary>
/// Required method for Designer support - do not modify
/// the contents of this method with the code editor.
/// </summary>
private void InitializeComponent()
{
this.ui_btnClose = new System.Windows.Forms.Button();
this.ui_btnStart = new System.Windows.Forms.Button();
this.ui_btnStop = new System.Windows.Forms.Button();
this.textBox1 = new System.Windows.Forms.TextBox();
this.ui_btnClear = new System.Windows.Forms.Button();
this.numNoOfTheads = new System.Windows.Forms.NumericUpDown();
this.label1 = new System.Windows.Forms.Label();
((System.ComponentModel.ISupportInitialize)(this.numNoOfTheads)).BeginInit();
this.SuspendLayout();
//
// ui_btnClose
//
this.ui_btnClose.Location = new System.Drawing.Point(433, 268);
this.ui_btnClose.Name = "ui_btnClose";
this.ui_btnClose.Size = new System.Drawing.Size(75, 23);
this.ui_btnClose.TabIndex = 0;
this.ui_btnClose.Text = "Close";
this.ui_btnClose.UseVisualStyleBackColor = true;
this.ui_btnClose.Click += new System.EventHandler(this.ui_btnClose_Click);
//
// ui_btnStart
//
this.ui_btnStart.Location = new System.Drawing.Point(12, 12);
this.ui_btnStart.Name = "ui_btnStart";
this.ui_btnStart.Size = new System.Drawing.Size(75, 23);
this.ui_btnStart.TabIndex = 1;
this.ui_btnStart.Text = "Start";
this.ui_btnStart.UseVisualStyleBackColor = true;
this.ui_btnStart.Click += new System.EventHandler(this.ui_btnStart_Click);
//
// ui_btnStop
//
this.ui_btnStop.Location = new System.Drawing.Point(12, 41);
this.ui_btnStop.Name = "ui_btnStop";
this.ui_btnStop.Size = new System.Drawing.Size(75, 23);
this.ui_btnStop.TabIndex = 2;
this.ui_btnStop.Text = "Stop";
this.ui_btnStop.UseVisualStyleBackColor = true;
this.ui_btnStop.Click += new System.EventHandler(this.ui_btnStop_Click);
//
// textBox1
//
this.textBox1.Location = new System.Drawing.Point(93, 12);
this.textBox1.Multiline = true;
this.textBox1.Name = "textBox1";
this.textBox1.ScrollBars = System.Windows.Forms.ScrollBars.Both;
this.textBox1.Size = new System.Drawing.Size(415, 241);
this.textBox1.TabIndex = 3;
//
// ui_btnClear
//
this.ui_btnClear.Location = new System.Drawing.Point(352, 268);
this.ui_btnClear.Name = "ui_btnClear";
this.ui_btnClear.Size = new System.Drawing.Size(75, 23);
this.ui_btnClear.TabIndex = 4;
this.ui_btnClear.Text = "Clear";
this.ui_btnClear.UseVisualStyleBackColor = true;
this.ui_btnClear.Click += new System.EventHandler(this.ui_btnClear_Click);
//
// numNoOfTheads
//
this.numNoOfTheads.Location = new System.Drawing.Point(12, 98);
this.numNoOfTheads.Name = "numNoOfTheads";
this.numNoOfTheads.Size = new System.Drawing.Size(74, 20);
this.numNoOfTheads.TabIndex = 5;
this.numNoOfTheads.Value = new decimal(new int[] {
1,
0,
0,
0});
//
// label1
//
this.label1.AutoSize = true;
this.label1.Location = new System.Drawing.Point(9, 82);
this.label1.Name = "label1";
this.label1.Size = new System.Drawing.Size(83, 13);
this.label1.TabIndex = 6;
this.label1.Text = "No. Of Threads:";
//
// Form1
//
this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);
this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
this.ClientSize = new System.Drawing.Size(520, 303);
this.Controls.Add(this.label1);
this.Controls.Add(this.numNoOfTheads);
this.Controls.Add(this.ui_btnClear);
this.Controls.Add(this.textBox1);
this.Controls.Add(this.ui_btnStop);
this.Controls.Add(this.ui_btnStart);
this.Controls.Add(this.ui_btnClose);
this.Name = "Form1";
this.Text = "Slow My Machine";
this.Load += new System.EventHandler(this.Form1_Load);
this.FormClosing += new System.Windows.Forms.FormClosingEventHandler(this.Form1_FormClosing);
((System.ComponentModel.ISupportInitialize)(this.numNoOfTheads)).EndInit();
this.ResumeLayout(false);
this.PerformLayout();
}
#endregion
private System.Windows.Forms.Button ui_btnClose;
private System.Windows.Forms.Button ui_btnStart;
private System.Windows.Forms.Button ui_btnStop;
private System.Windows.Forms.TextBox textBox1;
private System.Windows.Forms.Button ui_btnClear;
private System.Windows.Forms.NumericUpDown numNoOfTheads;
private System.Windows.Forms.Label label1;
}
更新 如果我将锁移动到UpdateText方法中的else并添加一个Thread.Sleep（20）;在循环中，然后我的GUI响应更快，我可以单击“停止”按钮并移动表单。
任何反馈，修复将不胜感激。
答案 0 :(得分：3)
lock内的UpdateText会导致死锁。工作线程获取锁，然后调用Invoke。然后UI线程调用尝试获取相同的锁，但必须等到它被释放。问题是锁永远不会被释放，因为Invoke阻塞直到UI线程完成委托的执行。这种情况从未发生过，因为UI线程仍在等待获取锁定。死锁！
答案 1 :(得分：1)
将for循环更改为
for (int i = 0; i < 10000; i++)
{
var text = "Loop " + i + " for " + Thread.CurrentThread.ManagedThreadId;
if (textBox1.InvokeRequired)
textBox1.Invoke(new SetTextDelegate(UpdateText), text);
else
UpdateText(text);
}
将UpdateText更改为
private void UpdateText(string text)
{
textBox1.SuspendLayout();
textBox1.Text = textBox1.Text + text + System.Environment.NewLine;
textBox1.SelectionStart = textBox1.Text.Length;
textBox1.ScrollToCaret();
textBox1.ResumeLayout();
}
编辑：我的错误。这只会改善组织，而不是在任何方面。如果你想频繁更新用户界面，你应该使用BackgroundWorker rdkleine所说的。
答案 2 :(得分：0)
尝试将UpdateText中的锁定移动到else中。
答案 3 :(得分：0)
使用更新UI线程的BackgroundWorker。
这是一个如何使用BackgroundWorker的好例子：
http://msdn.microsoft.com/en-us/library/cc221403(v=vs.95).aspx
它没有解释如何检索数据（你的int值）并把它放在文本框中，但这是一个好的开始。