進度條問題4

在一個WinForm窗體上有三個進度條（分別爲a,b,c)和一個Button按鈕，點擊按鈕，程序開始運行，當a走100%時，b走10%，c走1%。請問這個程序要怎麼寫？

 

首先你要對線程有一定的瞭解。進度條的顯示、後臺的進度計算是在兩個線程裏面分別來運行的。不然會出現不同步的問題。

然後是委託。用委託來進行兩個線程之間的通信。

至於三個進度條，簡單：直接在計算進度的線程中，算好的進度，直接給主線程a走100%時，b走10%，c走1%，百分知多少就是參數的問題。

如果你的重點是 “a走100%時，b走10%，c走1%”。你只要在得到百分比的算法上作文章了。

比如：a的工作量：循環100次，那麼b循環1000次，c循環10000次。那麼同等時間裏就是你要的效果。

明白吧。這個功能在vs2005 中，有個控件是做個的。一個是那個進度條控件，一個就是 back..的控件。圖標很好認有半個進度條。

給分吧

補充例子：

namespace Pro
{
    delegate void setprogressBar(int prent, string rogressBar_name);
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void backgroundWorker1_DoWork(object sender, DoWorkEventArgs e)
        {
            //聲明委託對象
            setprogressBar set = new setprogressBar(SetValue);
            //進度條的計算、直接用循環代替後臺的操作。
            for (int i = 0; i < 10000; i++)
            {
                //跨線程調用
                this.Invoke(set, new object[] { i / 100, "a" });
                this.Invoke(set, new object[] { i / 1000, "b" });
                this.Invoke(set, new object[] { i / 10000, "c" });
            }
        }
        /// <summary>
        /// 測試開始
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void button1_Click(object sender, EventArgs e)
        {
            this.backgroundWorker1.RunWorkerAsync();
        }
        /// <summary>
        /// 主線程中設置進度數值
        /// </summary>
        /// <param name="prent">百分比</param>
        /// <param name="name">控件名稱</param>
        private void SetValue(int prent, string name)
        {
            switch (name)
            {
                case "a":
                    this.progressBar1.Value = prent;
                    break;
                case "b":
                    this.progressBar2.Value = prent;
                    break;
                case "c":
                    this.progressBar3.Value = prent;
                    break;
            }
        }
    }
}

 

public class WorkerBar
    {
        private EventWaitHandle _event;
        private EventWaitHandle _parentEvent;
        private ProgressBar _bar;

        public WorkerBar(ProgressBar bar,EventWaitHandle eventHandle,EventWaitHandle parentEventHandle)
        {
            this ._bar = bar;
            this ._event = eventHandle;
            this ._parentEvent = parentEventHandle;
        }

        private delegate void PerformStepDelegate(ProgressBar progressBar);

        public void PerformStep(ProgressBar progressBar)
        {
            if ( ! progressBar.InvokeRequired)
            {
                progressBar.PerformStep();
            }
            else
            {
                PerformStepDelegate performStep = new PerformStepDelegate( this .PerformStep);
                progressBar.Invoke(performStep, new object [] { progressBar });
            }
        }

        public EventWaitHandle Event
        {
            get
            {
                return this ._event;
            }
        }

        public EventWaitHandle ParentEvent
        {
            get
            {
                return this ._parentEvent;
            }
        }

        public ProgressBar Bar
        {
            get
            {
                return this ._bar;
            }
        }
    }

 

public partial class Form1 : Form
    {
        private List < WorkerBar > _workerBars;
        private WaitHandle[] _waitEvents;

        public Form1()
        {
            InitializeComponent();

            _workerBars = new List < WorkerBar > ();
            _waitEvents = new WaitHandle[ 3 ];
        }

        private void button1_Click( object sender, EventArgs e)
        {
            for ( int i = 0 ; i < 3 ; i ++ )
            {
                _waitEvents[i] = new ManualResetEvent( false );
            }

            _workerBars.Add( new WorkerBar( this .progressBar1, (EventWaitHandle)_waitEvents[ 0 ], (EventWaitHandle)_waitEvents[ 1 ]));
            _workerBars.Add( new WorkerBar( this .progressBar2, (EventWaitHandle)_waitEvents[ 1 ], (EventWaitHandle)_waitEvents[ 2 ]));
            _workerBars.Add( new WorkerBar( this .progressBar3, (EventWaitHandle)_waitEvents[ 2 ], (EventWaitHandle)_waitEvents[ 0 ]));

            Thread th1 = new Thread(ProgressBar1ThreadProc);
            Thread th2 = new Thread(ProgressBar2ThreadProc);
            Thread th3 = new Thread(ProgressBar3ThreadProc);

            th1.Start(_workerBars[ 0 ]);
            th2.Start(_workerBars[ 1 ]);
            th3.Start(_workerBars[ 2 ]);
        }

        /// <summary>
        /// 工作線程 1
        /// </summary>
        private static void ProgressBar1ThreadProc( object obj)
        {
            WorkerBar workerBar = (WorkerBar)obj;

            while (workerBar.Bar.Value != workerBar.Bar.Maximum)
            {
                Thread.Sleep( 100 );
               
                workerBar.PerformStep(workerBar.Bar);

                workerBar.ParentEvent.Set(); // 通知工作線程 1
            }
        }

        /// <summary>
        /// 工作線程 2
        /// </summary>
        private static void ProgressBar2ThreadProc( object obj)
        {
            WorkerBar workerBar = (WorkerBar)obj;

            while (workerBar.Bar.Value != workerBar.Bar.Maximum)
            {
                workerBar.Event.WaitOne(); // 等待工作線程 1 通知
               
                workerBar.PerformStep(workerBar.Bar);

                workerBar.Event.Reset();
                workerBar.ParentEvent.Set();  // 通知工作線程 3
            }
        }

        /// <summary>
        /// 工作線程 3
        /// </summary>
        private static void ProgressBar3ThreadProc( object obj)
        {
            WorkerBar workerBar = (WorkerBar)obj;

            while (workerBar.Bar.Value != workerBar.Bar.Maximum)
            {
                workerBar.Event.WaitOne(); // 等待工作線程 2 通知

                workerBar.PerformStep(workerBar.Bar);

                workerBar.Event.Reset();
            }
        }
    }

partial class Form1
    {
/// <summary>
        /// 必需的設計器變量。
        /// </summary>
        private System.ComponentModel.IContainer components = null ;

        /// <summary>
        /// 清理所有正在使用的資源。
        /// </summary>
        /// <param name="disposing"> 如果應釋放託管資源，爲 true；否則爲 false。 </param>
        protected override void Dispose( bool disposing)
        {
            if (disposing && (components != null ))
            {
                components.Dispose();
            }
            base .Dispose(disposing);
        }

        #region Windows 窗體設計器生成的代碼

        /// <summary>
        /// 設計器支持所需的方法 - 不要
        /// 使用代碼編輯器修改此方法的內容。
        /// </summary>
        private void InitializeComponent()
        {
            this .button1 = new System.Windows.Forms.Button();
            this .progressBar1 = new System.Windows.Forms.ProgressBar();
            this .progressBar2 = new System.Windows.Forms.ProgressBar();
            this .progressBar3 = new System.Windows.Forms.ProgressBar();
            this .SuspendLayout();
            //
            // button1
            //
            this .button1.Location = new System.Drawing.Point( 578 , 42 );
            this .button1.Name = " button1 " ;
            this .button1.Size = new System.Drawing.Size( 75 , 23 );
            this .button1.TabIndex = 0 ;
            this .button1.Text = " button1 " ;
            this .button1.UseVisualStyleBackColor = true ;
            this .button1.Click += new System.EventHandler( this .button1_Click);
            //
            // progressBar1
            //
            this .progressBar1.Location = new System.Drawing.Point( 12 , 42 );
            this .progressBar1.Maximum = 1000 ;
            this .progressBar1.Name = " progressBar1 " ;
            this .progressBar1.Size = new System.Drawing.Size( 533 , 23 );
            this .progressBar1.Step = 100 ;
            this .progressBar1.TabIndex = 1 ;
            //
            // progressBar2
            //
            this .progressBar2.Location = new System.Drawing.Point( 12 , 107 );
            this .progressBar2.Maximum = 1000 ;
            this .progressBar2.Name = " progressBar2 " ;
            this .progressBar2.Size = new System.Drawing.Size( 533 , 23 );
            this .progressBar2.TabIndex = 1 ;
            //
            // progressBar3
            //
            this .progressBar3.Location = new System.Drawing.Point( 12 , 163 );
            this .progressBar3.Maximum = 1000 ;
            this .progressBar3.Name = " progressBar3 " ;
            this .progressBar3.Size = new System.Drawing.Size( 533 , 23 );
            this .progressBar3.Step = 1 ;
            this .progressBar3.TabIndex = 1 ;
            //
            // Form1
            //
            this .AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);
            this .AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
            this .ClientSize = new System.Drawing.Size( 689 , 366 );
            this .Controls.Add( this .progressBar3);
            this .Controls.Add( this .progressBar2);
            this .Controls.Add( this .progressBar1);
            this .Controls.Add( this .button1);
            this .Name = " Form1 " ;
            this .Text = " Form1 " ;
            this .ResumeLayout( false );

        }

        #endregion

        private System.Windows.Forms.Button button1;
        private System.Windows.Forms.ProgressBar progressBar1;
        private System.Windows.Forms.ProgressBar progressBar2;
        private System.Windows.Forms.ProgressBar progressBar3;
    }