Windows Phone 7开发,进度条ProgressBar使用详解

进度条在应用中的作用非常大,可以告诉用户当前操作执行的进度,以免用户在等待中失去耐心,进而关闭应用.Windows Phone 7的进度条有两种样式,一种是从左往右循环滚动的小点点,这种进度条并不能显示当前进度,类似于Android进度条的转圈风格;另一种就是能显示进度的普通进度条,两种样式效果如下图:

介绍一下这个实例,页面上三个控件,两个ProgressBar分别显示两种风格的进度条,一个按钮,用于开启新线程更新ProgressBar的进度,这里用于了委托,如有不明白,参考:
几个控件的XAML代码:


        <Grid x:Name="ContentPanel" Grid.Row="1" Margin="12,0,12,0" Background="{x:Null}">
            <ProgressBar Height="54" HorizontalAlignment="Left" Margin="17,27,0,0" Name="progressBar1" VerticalAlignment="Top" Width="390" IsIndeterminate="True" />
            <!--IsIndeterminate是关键,这个属性确定了ProgressBar的样式,默认是false,就是普通的能显示进度的进度条,true就是不能显示进度的进度条-->
            <ProgressBar Height="59" HorizontalAlignment="Left" Margin="31,107,0,0" Name="progressBar2" VerticalAlignment="Top" Width="374"  />
            <Button Content="更新progressBar2" Height="82" HorizontalAlignment="Left" Margin="63,199,0,0" Name="button1" VerticalAlignment="Top" Width="260" Click="button1_Click" />
        </Grid>

C#程序代码:



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 Microsoft.Phone.Controls;
using System.Threading;

namespace PhoneApp3
{
    public partial class MainPage : PhoneApplicationPage
    {
        delegate void ProgressDelegate(int i);
        //声明委托类型
        //委托的内容如有不明白,见http://www.pocketdigi.com/20110916/476.html 有详细注解
        ProgressDelegate progressDelegate;
        //声明委托
        public MainPage()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, RoutedEventArgs e)
        {
            progressDelegate = SetProgress;
            //把更新进度方法添加进委托
            new Thread(new ThreadStart(ThreadProc)).Start();
            //开启新线程

        }
        private void SetProgress(int i)
        {
            //这是更新进度条的方法
            progressBar2.Value = i;
            if (i == 100)
            {
                //如果达到100,则隐藏进度条
                progressBar2.Visibility = Visibility.Collapsed;
                //显示方法Visibility.Visibl
            }
        }
        private void ThreadProc()
        {//新线程执行的方法
            for (int i = 0; i <= 100; i++)
            {
                this.Dispatcher.BeginInvoke(progressDelegate,i);
                //线程中调用委托来更新UI,参数是委托,以及委托的参数
                Thread.Sleep(1000);
            }

        }
    }
}

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