实验5：数据流练习

通过本实验，熟悉和掌握Encoding类、FileStream类以及MemoryStream类的使用。

1、创建一个WPF应用程序项目

2、将App.xaml中的Application.Resources节内容改为

<Application x:Class="WpfApp1.App"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:local="clr-namespace:WpfApp1"
             StartupUri="MainWindow.xaml">
    <Application.Resources>
        <Style x:Key="LabelStyle" TargetType="Label">
            <Setter Property="FontSize" Value="14"/>
            <Setter Property="HorizontalContentAlignment" Value="Center"/>
            <Setter Property="HorizontalAlignment" Value="Center" />
            <Setter Property="Background" Value="AliceBlue"/>
        </Style>
        <Style x:Key="BorderStyle" TargetType="Border">
            <Setter Property="Height" Value="35"/>
            <Setter Property="VerticalAlignment" Value="Center"/>
            <Setter Property="Background" Value="AliceBlue"/>
        </Style>
    </Application.Resources>
</Application>

3、修改MainWindow.xaml及代码隐藏类

MainWindow.xaml

<Window x:Class="WpfApp1.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:local="clr-namespace:WpfApp1"
        mc:Ignorable="d"
        Title="MainWindow" Height="450" Width="800">
    <Grid Margin="20">
        <Grid.ColumnDefinitions>
            <ColumnDefinition Width="Auto"/>
            <ColumnDefinition Width="*"/>
        </Grid.ColumnDefinitions>
        <Rectangle Grid.ColumnSpan="2" Fill="White" RadiusX="14" RadiusY="14" Stroke="Blue" StrokeDashArray="3"/>
        <Rectangle Grid.Column="0" Margin="7" Fill="#FFF0F9D8" RadiusX="10" RadiusY="10" Stroke="Blue" StrokeDashArray="3"/>
        <Rectangle Grid.Column="0" Margin=" 20" Fill="White" Stroke="Blue"/>
        <ScrollViewer Grid.Column="0" Margin="20">
            <StackPanel>
                <StackPanel.Resources>
                    <Style TargetType="Button">
                        <Setter Property="HorizontalContentAlignment" Value="Center"/>
                        <Setter Property="Margin" Value="5 10 5 0"/>
                        <Setter Property="Padding" Value=" 15 0 15 0"/>
                        <Setter Property="FontSize" Value=" 10"/>
                        <EventSetter Event="Click" Handler="button_Click"/>
                    </Style>
                </StackPanel.Resources>
                <Button Content="例1（StartStopProcess）" Tag="/Examples/Page1.xaml"/>
                
            </StackPanel>
        </ScrollViewer>
        <Frame Name="frame1" Grid.Column="1" Margin="10" BorderThickness="1" BorderBrush="Blue" NavigationUIVisibility="Hidden"/>
    </Grid>
</Window>

MainWindow.xaml.cs主要内容

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;

namespace WpfApp1
{
    /// <summary>
    /// MainWindow.xaml 的交互逻辑
    /// </summary>
    public partial class MainWindow : Window
    {
        Button oldButton = new Button();
        public MainWindow()
        {
            InitializeComponent();
        }
        private void button_Click(object sender, RoutedEventArgs e)
        {
            Button btn = e.Source as Button;
            btn.Foreground = Brushes.Black;
            oldButton.Foreground = Brushes.Black;
            oldButton = btn;
            frame1.Source = new Uri(btn.Tag.ToString(), UriKind.Relative);
        }
    }
}

Paeg1.xaml

Page1.xaml.cs

Paeg2.xaml

Page2.xaml.cs

Paeg3.xaml

<Page x:Class="WpfApp1.Examples.Page3"
      xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
      xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
      xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
      xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
      xmlns:local="clr-namespace:WpfApp1.Examples"
      mc:Ignorable="d" 
      d:DesignHeight="300" d:DesignWidth="300"
      Title="Page3">

    <DockPanel Background="White">
        
        <Border DockPanel.Dock="Top"  Style="{StaticResource BorderStyle}">
            <TextBlock Text="MemoryStream类的基本用法" Style="{StaticResource TitleStyle}"></TextBlock>
        </Border>
        <Border DockPanel.Dock="Bottom" Style="{StaticResource BorderStyle}">
            <StackPanel Orientation="Horizontal" HorizontalAlignment="Center">
                <Button Name="btn1" Width="70"
                        Content="运行" Click="btn1_Click"/>
                
            </StackPanel>
        </Border>
        <TextBlock x:Name="textBlock1" Height="237" TextWrapping="Wrap" Text="" VerticalAlignment="Top"/>

    </DockPanel>
</Page>

Page3.xaml.cs

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;

namespace WpfApp1.Examples
{
    /// <summary>
    /// Page3.xaml 的交互逻辑
    /// </summary>
    public partial class Page3 : Page
    {
        public Page3()
        {
            InitializeComponent();
        }

        private void btn1_Click(object sender, RoutedEventArgs e)
        {
            string str = "abcd、中国";
            textBlock1.Text = string.Format("写入的数据：{0}\n",str);
            Byte[] data = Encoding.UTF8.GetBytes(str);
            using (MemoryStream ms=new MemoryStream() )
            {
                ms.Write(data,0,data.Length);
                byte[] bytes = new byte[data.Length];
                ms.Position = 0;
                int n = ms.Read(bytes, 0, bytes.Length);
                string s = Encoding.UTF8.GetString(bytes, 0, n);
                textBlock1.Text += string.Format("读出的数据：{0}\n",s);
            }
        }
    }
}