我有一些代码，每次单击按钮时都会启动一个新线程。每个新线程在原始图形引擎中的随机位置绘制一个随机着色的圆，并将其添加到Listview。指向此引擎的链接为https://github.com/NAIT-CNT/GDIDrawer。
我需要找到一种基于用户单击的Listview项来删除和中止线程的方法。
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 GDIDrawer;
using System.Threading;
namespace ica7
{
public partial class Form1 : Form
{
CDrawer _gdi = new CDrawer();
List<Thread> _threads = new List<Thread>();
Random _rng = new Random();
Point _coords;
int _diameter;
bool _isRunning;
public Form1()
{
InitializeComponent();
_diameter = 10;
_isRunning = true;
btnStopThreads.Enabled = false;
}
private Color RandomColor()
{
return Color.FromArgb(_rng.Next(256), _rng.Next(256), _rng.Next(256));
}
private void DrawCircle(int diameter, Point coords, CDrawer gdi)
{
gdi.AddCenteredEllipse(coords, diameter, diameter, RandomColor());
}
private void btnStartThread_Click(object sender, EventArgs e)
{
btnStopThreads.Enabled = true;
Thread t = new Thread(() =>
{
int diameter = _diameter;
while (_isRunning)
{
_coords.X = _rng.Next(800);
_coords.Y = _rng.Next(600);
DrawCircle(diameter, _coords, _gdi);
Thread.Sleep(10);
}
});
_threads.Add(t);
ListViewItem lvi = new ListViewItem(t.ToString());
lboxThreads.Items.Add(lvi);
t.Start();
}
private void btnStopThreads_Click(object sender, EventArgs e)
{
_threads.ElementAt(lboxThreads.SelectedIndex).Abort();
lboxThreads.Items.RemoveAt(lboxThreads.SelectedIndex);
}
private void trackBar1_Scroll(object sender, EventArgs e)
{
_diameter = trackBar1.Value;
}
private void Form1_FormClosed(object sender, FormClosedEventArgs e)
{
_threads.ForEach(x => x.Abort());
}
}
}
这是设计器文件，以备需要时使用：
namespace ica7
{
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.components = new System.ComponentModel.Container();
this.btnStartThread = new System.Windows.Forms.Button();
this.btnStopThreads = new System.Windows.Forms.Button();
this.lboxThreads = new System.Windows.Forms.ListBox();
this.trackBar1 = new System.Windows.Forms.TrackBar();
this.lblTbMin = new System.Windows.Forms.Label();
this.lblTbMax = new System.Windows.Forms.Label();
this.timer1 = new System.Windows.Forms.Timer(this.components);
((System.ComponentModel.ISupportInitialize)(this.trackBar1)).BeginInit();
this.SuspendLayout();
//
// btnStartThread
//
this.btnStartThread.ForeColor = System.Drawing.SystemColors.ActiveCaptionText;
this.btnStartThread.Location = new System.Drawing.Point(9, 11);
this.btnStartThread.Name = "btnStartThread";
this.btnStartThread.Size = new System.Drawing.Size(121, 23);
this.btnStartThread.TabIndex = 0;
this.btnStartThread.Text = "Start a Thread";
this.btnStartThread.UseVisualStyleBackColor = true;
this.btnStartThread.Click += new System.EventHandler(this.btnStartThread_Click);
//
// btnStopThreads
//
this.btnStopThreads.ForeColor = System.Drawing.SystemColors.ActiveCaptionText;
this.btnStopThreads.Location = new System.Drawing.Point(9, 40);
this.btnStopThreads.Name = "btnStopThreads";
this.btnStopThreads.Size = new System.Drawing.Size(121, 23);
this.btnStopThreads.TabIndex = 1;
this.btnStopThreads.Text = "Stop Selected Thread";
this.btnStopThreads.UseVisualStyleBackColor = true;
this.btnStopThreads.Click += new System.EventHandler(this.btnStopThreads_Click);
//
// lboxThreads
//
this.lboxThreads.FormattingEnabled = true;
this.lboxThreads.Location = new System.Drawing.Point(138, 11);
this.lboxThreads.Name = "lboxThreads";
this.lboxThreads.Size = new System.Drawing.Size(303, 134);
this.lboxThreads.TabIndex = 2;
//
// trackBar1
//
this.trackBar1.Location = new System.Drawing.Point(9, 69);
this.trackBar1.Maximum = 50;
this.trackBar1.Minimum = 10;
this.trackBar1.Name = "trackBar1";
this.trackBar1.Size = new System.Drawing.Size(121, 45);
this.trackBar1.TabIndex = 3;
this.trackBar1.Value = 10;
this.trackBar1.Scroll += new System.EventHandler(this.trackBar1_Scroll);
//
// lblTbMin
//
this.lblTbMin.AutoSize = true;
this.lblTbMin.Location = new System.Drawing.Point(6, 101);
this.lblTbMin.Name = "lblTbMin";
this.lblTbMin.Size = new System.Drawing.Size(19, 13);
this.lblTbMin.TabIndex = 4;
this.lblTbMin.Text = "10";
//
// lblTbMax
//
this.lblTbMax.AutoSize = true;
this.lblTbMax.Location = new System.Drawing.Point(111, 101);
this.lblTbMax.Name = "lblTbMax";
this.lblTbMax.Size = new System.Drawing.Size(19, 13);
this.lblTbMax.TabIndex = 5;
this.lblTbMax.Text = "50";
//
// timer1
//
this.timer1.Tick += new System.EventHandler(this.timer1_Tick);
//
// Form1
//
this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);
this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
this.BackColor = System.Drawing.SystemColors.ActiveCaptionText;
this.ClientSize = new System.Drawing.Size(453, 157);
this.Controls.Add(this.lblTbMax);
this.Controls.Add(this.lblTbMin);
this.Controls.Add(this.trackBar1);
this.Controls.Add(this.lboxThreads);
this.Controls.Add(this.btnStopThreads);
this.Controls.Add(this.btnStartThread);
this.ForeColor = System.Drawing.SystemColors.ActiveCaption;
this.Name = "Form1";
this.Text = "Form1";
this.FormClosed += new System.Windows.Forms.FormClosedEventHandler(this.Form1_FormClosed);
((System.ComponentModel.ISupportInitialize)(this.trackBar1)).EndInit();
this.ResumeLayout(false);
this.PerformLayout();
}
#endregion
private System.Windows.Forms.Button btnStartThread;
private System.Windows.Forms.Button btnStopThreads;
private System.Windows.Forms.ListBox lboxThreads;
private System.Windows.Forms.TrackBar trackBar1;
private System.Windows.Forms.Label lblTbMin;
private System.Windows.Forms.Label lblTbMax;
private System.Windows.Forms.Timer timer1;
}
}
如果有任何更好的方法可以做到这一点，请告诉我。这是我第一次尝试线程。这是作业。