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WPF ページ間でのデータの受け渡し





WPFにおけるWindow同士でのデータのやり取りの一例を紹介したいと思います。
一つはFormでも使ってきたクラスのプロパティとしてのやり方です(ページ2から3へのデータの受け渡し方)。 もう一つはアプリケーションのプロパティですがグローバル変数のようなものです(ページ1から2への受け渡し方)。

Window1.xaml.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
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 Chap2_2
{
    /// <summary>
    /// Window1.xaml の相互作用ロジック
    /// </summary>
    public partial class Window1 : NavigationWindow
    {
        public Window1()
        {
            InitializeComponent();
            Navigate(new Page1());
        }
    }
}

Page1.xaml

    <page x:class="Chap2_2.Page1"
      xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
      xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
      title="ページ1" loaded="Page_Loaded">
        <stackpanel>
            <label>あなたのお名前は?</label>
            <textbox name="_nameBox" />
            <textblock>
            <hyperlink navigateuri="Page2.xaml" click="link_Click">次へ</hyperlink>
                </textblock>            
            </stackpanel>
    </page>

Page1.xaml.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
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 Chap2_2
{
    /// <summary>
    /// Page1.xaml の相互作用ロジック
    /// </summary>
    public partial class Page1 : Page
    {
        NavigationService _navigation;
        public Page1()
        {
            InitializeComponent();
            this.WindowTitle = "ページ1";
        }
        void link_Click(object sender, RoutedEventArgs e)
        {
            Page2 p = new Page2();
            
            Application.Current.Properties["Name"] = _nameBox.Text;
            _navigation.Navigate(p);
        }
        private void Hyperlink_RequestNavigate(object sender, RequestNavigateEventArgs e)
        {
            //ここで新しいプロパティ"Name"にデータを保存
            Application.Current.Properties["Name"] = _nameBox.Text;
        }
        private void Page_Loaded(object sender, RoutedEventArgs e)
        {
            _navigation = this.NavigationService;
            _navigation.Navigating += new NavigatingCancelEventHandler(_navigation_Navigating);
            _navigation.Navigated += new NavigatedEventHandler(_navigation_Navigated);
        }
        void _navigation_Navigated(object sender, NavigationEventArgs e)
        {
            _navigation.Navigated -= this._navigation_Navigated;
            _navigation.Navigating -= this._navigation_Navigating;
            _navigation = null;
        }
        void _navigation_Navigating(object sender, NavigatingCancelEventArgs e)
        {
            if (e.NavigationMode == NavigationMode.New && _nameBox.Text.Length == 0)
            {
                e.Cancel = true;
            }
        }
    }
}

Page2.xaml

    <page x:class="Chap2_2.Page2"
      xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
      xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
      title="ページ2" loaded="Page_Loaded">
        <stackpanel>
            <stackpanel orientation="Horizontal">
            <label name="_name" verticalcontentalignment="Top" padding="0" />
            <textblock verticalalignment="Stretch">さん、こんにちは。</textblock>
                </stackpanel>
            <stackpanel orientation="Horizontal">
            <textblock>私は、</textblock>
    <textbox name="myName" width="50"></textbox>
    <textblock>です。</textblock>
        </stackpanel>
    <textblock><hyperlink navigateuri="Page3.xaml" click="Hyperlink_Click">次へ</hyperlink></textblock>
        </stackpanel>
    </page>

Page2.xaml.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
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 Chap2_2
{
    /// <summary>
    /// Page2.xaml の相互作用ロジック
    /// </summary>
    public partial class Page2 : Page
    {
        NavigationService _navigation;
        public Page2()
        {
            InitializeComponent();
            this.WindowTitle = "ぺーじ2";
        }
        private void Page_Loaded(object sender, RoutedEventArgs e)
        {
            //Page1で保存したデータを取り出す
            _name.Content = Application.Current.Properties["Name"];
            _navigation = this.NavigationService;
            _navigation.Navigating += new NavigatingCancelEventHandler(_navigation_Navigating);
            _navigation.Navigated += new NavigatedEventHandler(_navigation_Navigated);
        }
        void _navigation_Navigated(object sender, NavigationEventArgs e)
        {
            _navigation.Navigated -= this._navigation_Navigated;
            _navigation.Navigating -= this._navigation_Navigating;
            _navigation = null;
        }
        void _navigation_Navigating(object sender, NavigatingCancelEventArgs e)
        {
            if (e.NavigationMode == NavigationMode.New && myName.Text.Length == 0)
            {
                e.Cancel = true;
            }
        }
        private void Hyperlink_Click(object sender, RoutedEventArgs e)
        {
            Page3 p = new Page3();
            //Page3のプロパティ"myName"にデータを保存
            p.myName = this.myName.Text;
            _navigation.Navigate(p);
        }
    }
}

Page3.xaml

<page x:class="Chap2_2.Page3"
      xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
      xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
      title="Page3">
    <stackpanel orientation="Horizontal">
    <textblock>さようなら、</textblock>
    <label name="_name" padding="0" />
    <textblock>さん。</textblock>
    </stackpanel>
</page>

Page3.xaml.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
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 Chap2_2
{
    /// <summary>
    /// Page3.xaml の相互作用ロジック
    /// </summary>
    public partial class Page3 : Page
    {
        public Page3()
        {
            InitializeComponent();
            this.WindowTitle = "ページ3";
        }
        public string myName
        {
            set { _name.Content = value; }
        }
    }
}








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