liuznsn

2008-12-08

Silverlight 使用多執行緒threading

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Silverlight 使用多執行緒threading

 

 

Silverlight 基本上跟我們常用的應用程式一樣，有多執行緒(Threading)的功能，這樣除了可以同時做很多件事外也能改同步改變元件的屬性。在Silverlight當中有完整的Threading的library可以使用，但有很多種方式，例如BackgroundWorker、ThreadPool或是現在這種法式，使得能夠有高效率的作業。

這篇文章主要是參考http://silverlight.net/blogs/msnow/archive/2008/11/25/silverlight-tip-of-the-day-73-threading-in-silverlight.aspx
但我改了一些，讓不同元件都使用Threading情形比較明白的呈現出來，而且這篇文章也順便教了我們如何在App.xaml改變Page.xaml設定值

這就是傳值的方法

private void Application_Exit(object sender, EventArgs e)
        {
         //在離開程式後更改Page的Done屬性
            ((Page)this.RootVisual).Done = true;
        }

這段程式就是讓每個元件在不同的執行緒上，透過這樣的方式，都在執行個體而不會干擾到對方。程式很簡單，一看應該就會懂了。

using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Shapes;
using System.Threading;

namespace SilverlightThreadingTest
{
    public partial class Page : UserControl
    {
        //建立static物件
        public static Thread tread1, tread2, tread3;
        public static int count =0;
        public static TextBlock tb1;
        public static Rectangle rc1;
        public static ProgressBar pb1;

        private static bool _done = true;
       
        public bool Done
        {
            get { return _done; }
            set { _done = value; }
        }

        public Page()
        {
            InitializeComponent();

            tb1 = tb;
            rc1 = rt;
            pb1 = pb;
        }

        void StartThread()
        {
            _done = false;

            //TextBlock Threading
            tread1 = new Thread(tbThread);
            tread1.Start();
            //Rectangle Threading
            tread2 = new Thread(rcThread);
            tread2.Start();
            //ProgressBar Threading
            tread3 = new Thread(pbThread);
            tread3.Start();     
       
        }


        void tbThread()
        {
            while (!_done)
            {

                count++;

                tb1.Dispatcher.BeginInvoke(delegate()
                {
                    //顯示count的累加
                    tb1.Text = count.ToString();

                });
                //等待一秒
                Thread.Sleep(100);

            }
        }

        void rcThread()
        {
            while (!_done)
            {

                count++;

                rc1.Dispatcher.BeginInvoke(delegate()
                {
                    //變更Rectangle寬度
                   rc1.Width = count;

                });

                Thread.Sleep(100);

            }
        }

        void pbThread()
        {
            while (!_done)
            {

                count++;

                pb1.Dispatcher.BeginInvoke(delegate()
                {
                    //ProgressBar數值
                    pb1.Value = count/10;

                });

                Thread.Sleep(100);

            }
        }

        //按下按鈕
        private void Button_Click(object sender, RoutedEventArgs e)
        {
            if (false == _done)
                _done = true;
            else
                this.StartThread();
       
        }

    }
}

 

之後我會再實做不同方法來實做幾個範例吧！！！