SaveFileDialog, HeaderedItemsControl, VirtualizingStackPanel

概述SaveFileDialog, HeaderedItemsControl, VirtualizingStackPanel 介绍 Silverlight 3.0 控件一览： ·         ChildWindow - 用于在父窗体前d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） ·       

SavefileDialog,headeredItemsControl,VirtualizingStackPanel

介绍
Silverlight 3.0 控件一览：

·         ChilDWindow - 用于在父窗体前d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_404_406@{
    public partial class ChilDWindowDemo : Page
    @H_404_406@ {
        public ChilDWindowDemo()
        @H_404_406@ {
            InitializeComponent();
        }

        private voID btnChilDWindow_Click(object sender, RoutedEventArgs e)
        @H_404_406@ {
            /**//*
             * 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_404_406@ {
            /**//*
             * 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_404_406@ {
            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_404_406@{
    public partial class CustomChilDWindow : System.windows.Controls.ChilDWindow
    @H_404_406@ {
        public CustomChilDWindow()
        @H_404_406@ {
            InitializeComponent();
        }

        private voID OKbutton_Click(object sender, RoutedEventArgs e)
        @H_404_406@ {
            /**//*
             * 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_404_406@ {
            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_404_406@{
    public partial class SavefileDialogDemo : Page
    @H_404_406@ {
        public SavefileDialogDemo()
        @H_404_406@ {
            InitializeComponent();
        }

        private voID btnSave_Click(object sender, RoutedEventArgs e)
        @H_404_406@ {
            /**//*
             * 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_404_406@ {
                using (Stream stream = dialog.Openfile())
                @H_404_406@ {
                    byte[] info = EnCoding.UTF8.GetBytes(txtInfo.Text);
                    stream.Write(info, 0, info.Length);
                }

                txtInfo.Text = "";
            }
        }

        private voID btnLoad_Click(object sender, RoutedEventArgs e)
        @H_404_406@ {
            /**//*
             * 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_404_406@ {
                using (fileStream fs = dialog.file.OpenRead())
                @H_404_406@ {
                    byte[] buffer = new byte[fs.Length];
                    fs.Read(buffer, buffer.Length);

                    txtInfo.Text = EnCoding.UTF8.GetString(buffer, buffer.Length);                }            }        }    }}

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