SaveFileDialog,HeaderedItemsControl,VirtualizingStackPanel
介绍
Silverlight 3.0 控件一览：
· ChildWindow - 用于在父窗体前弹出一个的子窗体
· SaveFileDialog - 用户发起的保存文件对话框（OpenFileDialog - 打开文件对话框）
· HeaderedItemsControl - 呈现标题和集合数据的控件
· VirtualizingStackPanel - 虚拟化的 StackPanel（即仅生成需要显示的 UI 元素。当绑定了大量数据，而某时仅显示其中一小部分的时候，使用此控件则可大幅提高呈现效率）
示例
1、演示 ChildWindow 的应用
ChildWindowDemo.xaml
<navigation:Page x:Class="Silverlight30.Control.ChildWindowDemo"
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"
mc:Ignorable="d"
xmlns:navigation="clr-namespace:System.Windows.Controls;assembly=System.Windows.Controls.Navigation"
d:DesignWidth="640" d:DesignHeight="480"
Title="ChildWindowDemo Page">
<Grid x:Name="LayoutRoot">
<StackPanel>
<Button x:Name="btnChildWindow" Content="Show ChildWindow" Click="btnChildWindow_Click" />
<Button x:Name="btnCustomChildWindow" Content="Show CustomChildWindow" Click="btnCustomChildWindow_Click" />
<TextBlock x:Name="lblResult" />
</StackPanel>
</Grid>
</navigation:Page>
ChildWindowDemo.xaml.cs
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.Windows.Navigation;
namespace Silverlight30.Control
@H_834_404@{
public partial class ChildWindowDemo : Page
@H_834_404@ {
public ChildWindowDemo()
@H_834_404@ {
InitializeComponent();
}
private void btnChildWindow_Click(object sender, RoutedEventArgs e)
@H_834_404@ {
/*
* ChildWindow - 在父窗体前显示的子窗体
* Title - 子窗体的标题
* Content - 子窗体的内容
* HasCloseButton - 子窗体上是否要有关闭按钮（右上角的 ×）
* OverlayBrush - 子窗体打开后，覆盖在父窗体上的 Brush
* OverlayOpacity - 子窗体打开后，覆盖在父窗体上的 Brush 的不透明度
* Width - 子窗体的宽
* Height - 子窗体的高
* Closed事件 - 子窗体关闭后所触发的事件
* Show() - 打开（显示）子窗体
*/
ChildWindow child = new ChildWindow();
child.Title = "标题";
child.Content = "内容";
child.HasCloseButton = true;
child.OverlayBrush = new SolidColorBrush(Colors.Red);
child.OverlayOpacity = 0.3;
child.Width = 320;
child.Height = 240;
child.Show();
}
void child_Closed(object sender, EventArgs e)
@H_834_404@ {
/*
* ChildWindow.DialogResult - 子窗体传递回来的一个 bool? 值（可以用来描述在子窗体中是单击了“确定”按钮还是“取消”按钮）
* ChildWindow.DataContext - 子窗体传递回来的数据上下文
*/
CustomChildWindow child = sender as CustomChildWindow;
MessageBox.Show(string.Format("DialogResult:{0}; DataContext:{1}", child.DialogResult, child.DataContext));
}
private void btnCustomChildWindow_Click(object sender, RoutedEventArgs e)
@H_834_404@ {
CustomChildWindow child = new CustomChildWindow();
child.Closed += new EventHandler(child_Closed);
child.Show();
}
}
}
CustomChildWindow.xaml（自定义子窗体）
<controls:ChildWindow x:Class="Silverlight30.Control.CustomChildWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:controls="clr-namespace:System.Windows.Controls;assembly=System.Windows.Controls"
Width="320" Height="240"
Title="我是标题">
<Grid x:Name="LayoutRoot" Margin="2">
<Grid.RowDeFinitions>
<RowDeFinition />
<RowDeFinition Height="Auto" />
</Grid.RowDeFinitions>
<Button x:Name="CancelButton" Content="Cancel" Click="CancelButton_Click" Width="75" Height="23" HorizontalAlignment="Right" Margin="0,12,0" Grid.Row="1" />
<Button x:Name="OKButton" Content="OK" Click="OKButton_Click" Width="75" Height="23" HorizontalAlignment="Right" Margin="0,79,0" Grid.Row="1" />
</Grid>
</controls:ChildWindow>
CustomChildWindow.xaml.cs
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;
namespace Silverlight30.Control
@H_834_404@{
public partial class CustomChildWindow : System.Windows.Controls.ChildWindow
@H_834_404@ {
public CustomChildWindow()
@H_834_404@ {
InitializeComponent();
}
private void OKButton_Click(object sender, RoutedEventArgs e)
@H_834_404@ {
/*
* ChildWindow.DialogResult - 传递给父窗体的一个 bool? 值（可以用来描述在子窗体中是单击了“确定”按钮还是“取消”按钮）
* ChildWindow.DataContext - 传递给父窗体的数据上下文
*/
this.DataContext = "点击了 OK 按钮";
this.DialogResult = true;
}
private void CancelButton_Click(object sender, RoutedEventArgs e)
@H_834_404@ {
this.DataContext = "点击了 Cancel 按钮";
this.DialogResult = false;
}
}
}
2、SaveFileDialog 和 OpenFileDialog 的演示
SaveFileDialogDemo.xaml
<navigation:Page x:Class="Silverlight30.Control.SaveFileDialogDemo"
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"
mc:Ignorable="d"
xmlns:navigation="clr-namespace:System.Windows.Controls;assembly=System.Windows.Controls.Navigation"
d:DesignWidth="640" d:DesignHeight="480"
Title="SaveFileDialog Page">
<Grid x:Name="LayoutRoot">
<StackPanel>
<TextBox x:Name="txtInfo" />
<Button x:Name="btnSave" Content="保存" Click="btnSave_Click" />
<Button x:Name="btnLoad" Content="载入" Click="btnLoad_Click" />
</StackPanel>
</Grid>
</navigation:Page>
SaveFileDialogDemo.xaml.cs
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.Windows.Navigation;
using System.IO;
using System.Text;
namespace Silverlight30.Control
@H_834_404@{
public partial class SaveFileDialogDemo : Page
@H_834_404@ {
public SaveFileDialogDemo()
@H_834_404@ {
InitializeComponent();
}
private void btnSave_Click(object sender, RoutedEventArgs e)
@H_834_404@ {
/*
* SaveFileDialog - 用户发起的保存文件对话框
* Filter - 指定保存文件的描述信息及文件类型（出现在对话框的“保存类型”下拉列表中）
* DefaultExt - 当指定保存文件类型为 *.* 时的默认扩展名
* FilterIndex - 默认的保存类型在 Filter 中的索引（注意：索引从 1 开始）
* ShowDialog() - 显示保存文件对话框。用户在对话框中单击“保存”则返回 true；单击“取消”或关闭对话框则返回 false
* OpenFile() - 打开用户选择的文件，并返回文件流
*/
SaveFileDialog dialog = new SaveFileDialog();
dialog.Filter = "Text Files|*.txt|Log Files|*.log|All Files|*.*";
dialog.FilterIndex = 1;
bool? result = dialog.ShowDialog();
if (result == true)
@H_834_404@ {
using (Stream stream = dialog.OpenFile())
@H_834_404@ {
byte[] info = Encoding.UTF8.GetBytes(txtInfo.Text);
stream.Write(info, 0, info.Length);
}
txtInfo.Text = "";
}
}
private void btnLoad_Click(object sender, RoutedEventArgs e)
@H_834_404@ {
/*
* OpenFileDialog - 打开文件对话框
* Filter - 同 SaveFileDialog
* FilterIndex - 同 SaveFileDialog
* ShowDialog() - 显示打开文件对话框。用户在对话框中单击“打开”则返回 true；单击“取消”或关闭对话框则返回 false
* File - 返回用户所选择文件的的 FileInfo 对象
* Multiselect - 选择文件时可否多选
* Files - 返回用户所选择文件的的 FileInfo 对象集合
*/
OpenFileDialog dialog = new OpenFileDialog();
dialog.Filter = "Text Files|*.txt";
if (dialog.ShowDialog() == true)
@H_834_404@ {
using (FileStream fs = dialog.File.OpenRead())
@H_834_404@ {
byte[] buffer = new byte[fs.Length];
fs.Read(buffer, buffer.Length);
txtInfo.Text = Encoding.UTF8.GetString(buffer, buffer.Length); } } } }}
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