Winform线程队列的使用，模拟下载等待功能
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using System;using System.Collections.Generic;using System.ComponentModel;using System.Data;using System.Drawing;using System.Linq;using System.Text;using System.Threading;using System.Threading.Tasks;using System.Windows.Forms;namespace QueueWinForm{ public partial class Form1 : Form { //*********************************************************************************** //此内容涉及的知识点有：“线程Thread”“异步BeginInvoke”“锁Lock”“信号量Semphore” //“Lambda表达式”“队列Queue<T>”“任务Task”“LinQ查询” //*********************************************************************************** #region 参数 /// <summary> /// 锁 /// </summary> private object locker = new object(); /// <summary> /// 队列数据 /// </summary> private Queue<FileText> _FileQueue = new Queue<FileText>(); /// <summary> /// 信号量 /// </summary> private Semaphore LimitSemaphore = null; /// <summary> /// 保存文件 /// </summary> private List<FileText> _FileList = new List<FileText>(); #endregion #region 构造函数 public Form1() { InitializeComponent(); this.Load += (sender, e) => { InitSemphore();//信号量实例化 StartDequeueTask();//程序启动就预先执行出队列任务 RandomFile();//程序启动就预先执行随机文件操作,模拟文件并发现象 }; } #endregion #region 随机文件线程 /// <summary> /// 随机文件 /// </summary> private void RandomFile() { new Thread(() => { while (true) { lock (this) { if (_FileList.Count > 0) { int random = new Random().Next(_FileList.Count); FileText ft = _FileList[random]; DequeueTask(ft); } else Thread.Sleep(20); } } }) { IsBackground = true }.Start(); } /// <summary> /// 初始化信号量 /// </summary> private void InitSemphore() { int result = 0; bool isInt = int.TryParse(tbThreadNum.Text, out result); if (isInt) LimitSemaphore = new Semaphore(result, 6); else LimitSemaphore = new Semaphore(0, 1); } #endregion #region 文件出队列 /// <summary> /// 判断队列中是否还有文件数据 /// </summary> private bool isHavedFileData { get { return _FileQueue.Count > 0; } } /// <summary> /// 执行出队列任务 /// </summary> private void StartDequeueTask() { Task.Factory.StartNew(() => { while (true) { FileText ft = DequeueFile(); if (ft != null || _FileQueue.Count > 0) { DequeueTask(ft); } else Thread.Sleep(20); } }); } /// <summary> /// 队列任务进行中 /// </summary> /// <param name="ft"></param> private void DequeueTask(FileText ft) { if (ft != null) { switch (ft.pbName) { case "taskPro1": var file1 = from f in _FileList where f.pbName == "taskPro1" select f; int count1 = ft.startPro; int max1 = ft.endPro; if (count1 < max1) { try { this.BeginInvoke(new MethodInvoker(() => { Console.WriteLine(count1); taskPro1.Maximum = max1; taskPro1.Value = count1; if (taskPro1.Value != 0) lbPro1.Text = string.Format("{0}%", Math.Truncate(100 / (double)taskPro1.Maximum * count1)); })); count1++; foreach (var item in file1) { item.startPro = count1; } Thread.Sleep(1); } catch { } } else { lock (this) { FileText fText = _FileList.Find(r => r.pbName.Equals("taskPro1")); if (fText != null) { _FileList.Remove(fText); LimitSemaphore.Release(); } isEnable(btnTask1,true); } } break; case "taskPro2": var file2 = from f in _FileList where f.pbName == "taskPro2" select f; int count2 = ft.startPro; int max2 = ft.endPro; if (count2 < max2) { try { this.BeginInvoke(new MethodInvoker(() => { taskPro2.Maximum = max2; taskPro2.Value = count2; if (taskPro2.Value != 0) lbPro2.Text = string.Format("{0}%", Math.Truncate(100 / (double)taskPro2.Maximum * count2)); })); count2++; foreach (var item in file2) { item.startPro = count2; } Thread.Sleep(1); } catch { } } else { lock (this) { FileText fText = _FileList.Find(r => r.pbName.Equals("taskPro2")); if (fText != null) { _FileList.Remove(fText); LimitSemaphore.Release(); } isEnable(btnTask2, true); } } break; case "taskPro3": var file3 = from f in _FileList where f.pbName == "taskPro3" select f; int count3 = ft.startPro; int max3 = ft.endPro; if (count3 < max3) { try { this.BeginInvoke(new MethodInvoker(() => { taskPro3.Maximum = max3; taskPro3.Value = count3; if (taskPro3.Value != 0) lbPro3.Text = string.Format("{0}%", Math.Truncate(100 / (double)taskPro3.Maximum * count3)); })); count3++; foreach (var item in file3) { item.startPro = count3; } Thread.Sleep(1); } catch { } } else { lock (this) { FileText fText = _FileList.Find(r => r.pbName.Equals("taskPro3")); if (fText != null) { _FileList.Remove(fText); LimitSemaphore.Release(); } isEnable(btnTask3, true); } } break; case "taskPro4": var file4 = from f in _FileList where f.pbName == "taskPro4" select f; int count4 = ft.startPro; int max4 = ft.endPro; if (count4 < max4) { try { this.BeginInvoke(new MethodInvoker(() => { taskPro4.Maximum = max4; taskPro4.Value = count4; if (taskPro4.Value != 0) lbPro4.Text = string.Format("{0}%", Math.Truncate(100 / (double)taskPro4.Maximum * count4)); })); count4++; foreach (var item in file4) { item.startPro = count4; } Thread.Sleep(1); } catch { } } else { lock (this) { FileText fText = _FileList.Find(r => r.pbName.Equals("taskPro4")); if (fText != null) { _FileList.Remove(fText); LimitSemaphore.Release(); } isEnable(btnTask4, true); } } break; case "taskPro5": var file5 = from f in _FileList where f.pbName == "taskPro5" select f; int count5 = ft.startPro; int max5 = ft.endPro; if (count5 < max5) { try { this.BeginInvoke(new MethodInvoker(() => { taskPro5.Maximum = max5; taskPro5.Value = count5; if (taskPro5.Value != 0) lbPro5.Text = string.Format("{0}%", Math.Truncate(100 / (double)taskPro5.Maximum * count5)); })); count5++; foreach (var item in file5) { item.startPro = count5; } Thread.Sleep(1); } catch { } } else { lock (this) { FileText fText = _FileList.Find(r => r.pbName.Equals("taskPro5")); if (fText != null) { _FileList.Remove(fText); LimitSemaphore.Release(); } isEnable(btnTask5, true); } } break; case "taskPro6": var file6 = from f in _FileList where f.pbName == "taskPro6" select f; int count6 = ft.startPro; int max6 = ft.endPro; if (count6 < max6) { try { this.BeginInvoke(new MethodInvoker(() => { taskPro6.Maximum = max6; taskPro6.Value = count6; if (taskPro6.Value != 0) lbPro6.Text = string.Format("{0}%", Math.Truncate(100 / (double)taskPro6.Maximum * count6)); })); count6++; foreach (var item in file6) { item.startPro = count6; } Thread.Sleep(1); } catch { } } else { lock (this) { FileText fText = _FileList.Find(r => r.pbName.Equals("taskPro6")); if (fText != null) { _FileList.Remove(fText); LimitSemaphore.Release(); } isEnable(btnTask6, true); } } break; default: break; } } } /// <summary> /// 出队列 /// </summary> private FileText DequeueFile() { FileText ft = null; lock (locker) { if (isHavedFileData) { ft = _FileQueue.Dequeue(); } } return ft; } #endregion #region 文件进队列 /// <summary> /// 文件进队列 /// </summary> /// <param name="ft"></param> private void EnqueueFile(FileText ft) { lock (locker) { _FileQueue.Enqueue(ft); _FileList.Add(ft); } } /// <summary> /// 点击加入队列 /// </summary> /// <param name="sender"></param> /// <param name="e"></param> private void btnTask1_Click(object sender, EventArgs e) { FileText ft = new FileText(); Button btn = sender as Button; switch (btn.Name) { case "btnTask1": ft.pbName = "taskPro1"; ft.startPro = 0; ft.endPro = 2500; lbPro1.Text = "等待中..."; break; case "btnTask2": ft.pbName = "taskPro2"; ft.startPro = 0; ft.endPro = 3500; lbPro2.Text = "等待中..."; break; case "btnTask3": ft.pbName = "taskPro3"; ft.startPro = 0; ft.endPro = 4000; lbPro3.Text = "等待中..."; break; case "btnTask4": ft.pbName = "taskPro4"; ft.startPro = 0; ft.endPro = 3000; lbPro4.Text = "等待中..."; break; case "btnTask5": ft.pbName = "taskPro5"; ft.startPro = 0; ft.endPro = 5000; lbPro5.Text = "等待中..."; break; case "btnTask6": ft.pbName = "taskPro6"; ft.startPro = 0; ft.endPro = 4500; lbPro6.Text = "等待中..."; break; default: break; } StartRunEnqueueThread(ft); isEnable(btn,false); } /// <summary> /// 按钮是否可用 /// </summary> /// <param name="btn"></param> /// <param name="b"></param> private void isEnable(Button btn,bool b) { this.Invoke(new Action(() => { btn.Enabled = b; })); } /// <summary> /// 执行进队列线程操作 /// </summary> /// <param name="ft"></param> private void StartRunEnqueueThread(FileText ft) { Thread th = new Thread(new ParameterizedThreadStart(EnqueueMethod)); th.IsBackground = true; th.Start(ft); } /// <summary> /// 进队列方法，限制线程数 /// </summary> /// <param name="ft"></param> private void EnqueueMethod(object ft) { FileText fText = ft as FileText; LimitSemaphore.WaitOne();//等待信号 EnqueueFile(fText); } #endregion #region 析构函数释放资源 ~Form1() { Dispose(); } /// <summary> /// 释放资源 /// </summary> private new void Dispose() { if (_FileQueue.Count > 0) _FileQueue.Clear(); if (_FileList.Count > 0) _FileList.Clear(); LimitSemaphore.Close(); System.Diagnostics.Process.GetCurrentProcess().Kill(); } #endregion } #region 文件类 public class FileText { public string pbName { set; get; } public int startPro { set; get; } public int endPro { set; get; } } #endregion} 0 0
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