導(dǎo)航

1、方法一：使用線程

     功能描述：在用c#做WinFrom開發(fā)的過程中。我們經(jīng)常需要用到進(jìn)度條（ProgressBar）用于顯示進(jìn)度信息。這時(shí)候我們可能就需要用到多線程，如果不采用多線程控制進(jìn)度條，窗口很容易假死（無法適時(shí)看到進(jìn)度信息）。下面我就簡單結(jié)合一個(gè)我寫的例子給大家做一個(gè)介紹。

第一步：設(shè)計(jì)界面，注意需要引用 using System.Threading;

        private delegate void SetPos(int ipos,string vinfo);//代理

第三步：進(jìn)度條值更新函數(shù)（參數(shù)必須跟聲明的代理參數(shù)一樣）

        private void SetTextMesssage(int ipos,string vinfo)
        {
            if (this.InvokeRequired)
            {
                SetPos setpos = new SetPos(SetTextMesssage);
                this.Invoke(setpos, new object[] { ipos,vinfo });
            }
            else
            {
                this.label1.Text = ipos.ToString() + "/1000";
                this.progressBar1.Value = Convert.ToInt32(ipos);
                this.textBox1.AppendText(vinfo);
            }
        }

第四步：函數(shù)實(shí)現(xiàn)

        private void button1_Click(object sender, EventArgs e)
        {
            Thread fThread = new Thread(new ThreadStart(SleepT));
            fThread.Start();
        }

第五步：新的線程執(zhí)行函數(shù)：

        private void SleepT()
        {
            for (int i = 0; i < 500; i++)
            {
                System.Threading.Thread.Sleep(10);
                SetTextMesssage(100*i/500,i.ToString()+"\r\n");
            }
        }

程序運(yùn)行效果圖：

 控件名稱：

button1;backgroundWorker1;

對backgroundWorker1控件，屬性設(shè)置：

 第二步：主頁面后臺代碼：

using System.Threading;//引用空間名稱

        private void button1_Click(object sender, EventArgs e)
        {
            this.backgroundWorker1.RunWorkerAsync(); // 運(yùn)行 backgroundWorker 組件

            ProcessForm form = new ProcessForm(this.backgroundWorker1);// 顯示進(jìn)度條窗體
            form.ShowDialog(this);
            form.Close();
        }

        private void backgroundWorker1_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
        {
            if (e.Error != null)
            {
                MessageBox.Show(e.Error.Message);
            }
            else if (e.Cancelled)
            {
            }
            else
            {
            }
        }
        //你可以在這個(gè)方法內(nèi)，實(shí)現(xiàn)你的調(diào)用，方法等。
        private void backgroundWorker1_DoWork(object sender, DoWorkEventArgs e)
        {
            BackgroundWorker worker = sender as BackgroundWorker;
            for (int i = 0; i < 100; i++)
            {
                Thread.Sleep(100);
                worker.ReportProgress(i);
                if (worker.CancellationPending)  // 如果用戶取消則跳出處理數(shù)據(jù)代碼 
                {
                    e.Cancel = true;
                    break;
                }
            }
        }
分別為button控件和backgroundWorker1控件選好事件。

第三步：設(shè)置子窗體（及顯示進(jìn)度條的窗體）：

         private BackgroundWorker backgroundWorker1; //ProcessForm 窗體事件(進(jìn)度條窗體)

        public ProcessForm(BackgroundWorker backgroundWorker1)
        {
            InitializeComponent();

            this.backgroundWorker1 = backgroundWorker1;
            this.backgroundWorker1.ProgressChanged += new ProgressChangedEventHandler(backgroundWorker1_ProgressChanged);
            this.backgroundWorker1.RunWorkerCompleted += new RunWorkerCompletedEventHandler(backgroundWorker1_RunWorkerCompleted);
        }

        void backgroundWorker1_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
        {
            //this.Close();//執(zhí)行完之后，直接關(guān)閉頁面
        }

        void backgroundWorker1_ProgressChanged(object sender, ProgressChangedEventArgs e)
        {
            this.progressBar1.Value = e.ProgressPercentage;
        }

        private void button1_Click(object sender, EventArgs e)
        {
            this.backgroundWorker1.CancelAsync();
            this.button1.Enabled = false;
            this.Close();
        }
    }

只為button選好事件
 

執(zhí)行效果為：

 =================================================================================================

3、第三種方法：

     功能描述：在處理大量數(shù)據(jù)的時(shí)候，有時(shí)候方法的執(zhí)行需要一定的時(shí)間，這時(shí)候往往會造成頁面或程序的“假死”狀態(tài)，給用戶的體驗(yàn)度也不是很好。為了避免出現(xiàn)“假死”提高用戶的體驗(yàn)度，在這里為這類型的方法加了一個(gè)進(jìn)度條和一個(gè)文本框，進(jìn)度條用于顯示程序處理的進(jìn)度，文本框用于顯示在處理過程中，給與的提示。本方法主要使用了控件：backgroundWorker1；說明：本方法與上面的方法(方法二)基本類型，主要是設(shè)計(jì)和代碼進(jìn)行了一些修改。

 第一步：主窗體設(shè)計(jì)：

控件名稱：

button1;backgroundWorker1;

對backgroundWorker1控件，屬性設(shè)置：

第二步：主窗體 后臺代碼：

        private void button1_Click(object sender, EventArgs e)
        {
            this.backgroundWorker1.RunWorkerAsync(); // 運(yùn)行 backgroundWorker 組件

            ProcessForm form = new ProcessForm(this.backgroundWorker1);// 顯示進(jìn)度條窗體
            form.ShowDialog(this);
            form.Close();
        }

        private void backgroundWorker1_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
        {
            if (e.Error != null)
            {
                MessageBox.Show(e.Error.Message);
            }
            else if (e.Cancelled)
            {
            }
            else
            {
            }
        }
        //你可以在這個(gè)方法內(nèi)，實(shí)現(xiàn)你的調(diào)用，方法等。
        private void backgroundWorker1_DoWork(object sender, DoWorkEventArgs e)
        {
            BackgroundWorker worker = sender as BackgroundWorker;
            for (int i = 0; i < 100; i++)
            {
                Thread.Sleep(100);
                worker.ReportProgress(i, i.ToString() + "  你好！\r\n"); //注意：這里向子窗體返回信息值，這里是兩個(gè)值，一個(gè)用于進(jìn)度條，一個(gè)用于文本框的。
                if (worker.CancellationPending)  // 如果用戶取消則跳出處理數(shù)據(jù)代碼 
                {
                    e.Cancel = true;
                    break;
                }
            }
        }

第三步：設(shè)置子窗體（及顯示進(jìn)度條的窗體）：

 控件：

progressBar1；textBox1；button1

第四步：子窗體后臺代碼：

        private BackgroundWorker backgroundWorker1; //ProcessForm 窗體事件(進(jìn)度條窗體)

        public ProcessForm(BackgroundWorker backgroundWorker1)
        {
            InitializeComponent();

            this.backgroundWorker1 = backgroundWorker1;
            this.backgroundWorker1.ProgressChanged += new ProgressChangedEventHandler(backgroundWorker1_ProgressChanged);
            this.backgroundWorker1.RunWorkerCompleted += new RunWorkerCompletedEventHandler(backgroundWorker1_RunWorkerCompleted);
        }

        void backgroundWorker1_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
        {
            //this.Close();//執(zhí)行完之后，直接關(guān)閉頁面
        }

        void backgroundWorker1_ProgressChanged(object sender, ProgressChangedEventArgs e)
        {
            this.progressBar1.Value = e.ProgressPercentage;
            this.textBox1.AppendText(e.UserState.ToString());//主窗體傳過來的值，通過e.UserState.ToString()來接受
        }

        private void button1_Click(object sender, EventArgs e)
        {
            this.backgroundWorker1.CancelAsync();
            this.button1.Enabled = false;
            this.Close();
        }

實(shí)現(xiàn)的效果：

注意：如果在程序?yàn)閳?zhí)行完，就點(diǎn)擊取消的話，很有可能會報(bào)錯(cuò)的，這時(shí)候，你就修改一個(gè)方法：backgroundWorker1_ProgressChanged

如下：

        void backgroundWorker1_ProgressChanged(object sender, ProgressChangedEventArgs e)
        {
            this.progressBar1.Value = e.ProgressPercentage;
            this.textBox1.Text += e.UserState.ToString(); //主窗體傳過來的值，通過e.UserState.ToString()來接受
        }

       把這個(gè)方法，替換上邊的那個(gè)方法，就可以了。

=====================================================================================================

4、第四種方法：

     功能描述：本方法實(shí)現(xiàn)進(jìn)度條顯示，方法執(zhí)行信息反饋顯示。用到的技術(shù)點(diǎn)為 線程與代理。

     

    步驟一：添加主頁面。

        

控件名稱：

button1；

 

  步驟二：主頁面后臺代碼

        using System.Threading;//引用此命名

 

        //創(chuàng)建代理。

        private Form6 myProcessBar = null;//彈出的子窗體(用于顯示進(jìn)度條)
        private delegate bool IncreaseHandle(int nValue,string vinfo);//代理創(chuàng)建
        private IncreaseHandle myIncrease = null;//聲明代理，用于后面的實(shí)例化代理
        private int vMax = 100;//用于實(shí)例化進(jìn)度條，可以根據(jù)自己的需要，自己改變

 

        private void button1_Click(object sender, EventArgs e)
        {
            Thread thdSub = new Thread(new ThreadStart(ThreadFun));
            thdSub.Start();
        }

        private void ThreadFun()
        {
            MethodInvoker mi = new MethodInvoker(ShowProcessBar);
            this.BeginInvoke(mi);

            Thread.Sleep(100);
            object objReturn = null;
            for (int i = 0; i < vMax; i++)
            {
                objReturn = this.Invoke(this.myIncrease, new object[] { 2, i.ToString() + "\r\n" });
                Thread.Sleep(50);
            }
        }

        private void ShowProcessBar()
        {
            myProcessBar = new Form6(vMax);
            myIncrease = new IncreaseHandle(myProcessBar.Increase);
            myProcessBar.ShowDialog();
            myProcessBar = null;
        }

 

步驟三：創(chuàng)建子窗體

 

 控件名稱：

progressBar1；textBox1

 

步驟四：子窗體，后臺代碼

        public Form6(int vMax)
        {
            InitializeComponent();

            this.progressBar1.Maximum = vMax;
        }

        public bool Increase(int nValue,string nInfo)
        {
            if (nValue > 0)
            {
                if (progressBar1.Value + nValue < progressBar1.Maximum)
                {
                    progressBar1.Value += nValue;
                    this.textBox1.AppendText(nInfo);
                    Application.DoEvents();
                    progressBar1.Update();
                    progressBar1.Refresh();
                    this.textBox1.Update();
                    this.textBox1.Refresh();
                    return true;
                }
                else
                {
                    progressBar1.Value = progressBar1.Maximum;
                    this.textBox1.AppendText(nInfo);
                    //this.Close();//執(zhí)行完之后，自動關(guān)閉子窗體
                    return false;
                }
            }
            return false;
        }

 

執(zhí)行效果：