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トップC#に関する質問WPFのUserControlに独自型の依存関係プロパティを設定してバインドしたい

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1

見直しキャンペーン中

2023/07/29 05:40

投稿

TN8001
TN8001

スコア9326

test CHANGED
@@ -1,275 +1,138 @@
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  なぜかこういう作りにする方が多いですよね（過去記事等のミスリードなんだと思います）
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  この例だと依存関係プロパティを作る必要はありません。`DataContext`に`Texts`を渡すだけです。
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  どうしてもというなら`RelativeSource`や`ElementName`で、`UserControl1`自身を引っ張ってくる必要があります。
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  個人的にはユーザーコントロールで、依存関係プロパティが必要になることはほとんどないですね（カスタムコントロールでは多用しますが）
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-
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-
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- ```xaml
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+ ```xml:MainWindow.xaml
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-
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  <Window
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-
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  x:Class="Questions359857.MainWindow"
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-
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  xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
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-
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  xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
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-
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  xmlns:local="clr-namespace:Questions359857"
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-
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  Width="800"
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-
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  Height="450">
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-
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  <Window.Resources>
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-
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  <DataTemplate DataType="{x:Type local:Texts}">
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-
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  <local:UserControl2 />
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-
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  </DataTemplate>
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-
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  </Window.Resources>
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-
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  <Grid>
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-
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  <Grid.ColumnDefinitions>
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-
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  <ColumnDefinition />
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-
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  <ColumnDefinition />
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-
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  <ColumnDefinition />
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-
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  </Grid.ColumnDefinitions>
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-
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  <GroupBox Header="Original">
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-
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  <local:UserControl1 Value="{Binding ValueA.Value}" />
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  </GroupBox>
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  <GroupBox Grid.Column="1" Header="DataContext">
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  <local:UserControl2 DataContext="{Binding ValueB.Value}" />
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  </GroupBox>
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  <GroupBox Grid.Column="2" Header="DataTemplate">
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  <ContentControl Content="{Binding ValueC.Value}" />
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  </GroupBox>
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  </Grid>
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  </Window>
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-
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  ```
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- ```C#
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+ ```cs
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-
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  using Reactive.Bindings;
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  using System.Windows;
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+ namespace Questions359857
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+ {
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+ public class Texts
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+ {
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+ public int A { get; set; } = 5;
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+ public string B { get; set; } = "";
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+ public double? C { get; set; }
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+ }
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+
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+ public partial class MainWindow : Window
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+ {
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+ public ReactiveProperty<Texts> ValueA { get; } = new(new Texts { A = 1, B = "Ab", C = 10.0 });
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+ public ReactiveProperty<Texts> ValueB { get; } = new(new Texts { A = 2, B = "Bb", C = 222.22 });
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+ public ReactiveProperty<Texts> ValueC { get; } = new(new Texts { A = 3, B = "Cb", C = null });
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+
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+ public MainWindow()
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+ {
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+ InitializeComponent();
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+ DataContext = this;
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+ }
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+ }
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+ }
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+ ```
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+
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+ ```xml:UserControl1.xaml
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+ <UserControl
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+ x:Class="Questions359857.UserControl1"
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+ xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
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+ xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
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+ xmlns:local="clr-namespace:Questions359857"
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+ x:Name="userControl1">
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+ <StackPanel>
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+ <HeaderedContentControl Header="A">
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+ <TextBox Text="{Binding Value.A, UpdateSourceTrigger=PropertyChanged, RelativeSource={RelativeSource AncestorType={x:Type local:UserControl1}}}" />
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+ </HeaderedContentControl>
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+ <HeaderedContentControl Header="B">
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+ <TextBox Text="{Binding Value.B, UpdateSourceTrigger=PropertyChanged, ElementName=userControl1}" />
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+ </HeaderedContentControl>
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+ <HeaderedContentControl DataContext="{Binding RelativeSource={RelativeSource AncestorType={x:Type local:UserControl1}}}" Header="C">
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+ <TextBox Text="{Binding Value.C, UpdateSourceTrigger=PropertyChanged}" />
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+ </HeaderedContentControl>
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+ </StackPanel>
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+ </UserControl>
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+ ```
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+
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+ ```cs:UserControl1.xaml.cs
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+ using System.Windows;
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+ using System.Windows.Controls;
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+
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+ namespace Questions359857
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+ {
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+ public partial class UserControl1 : UserControl
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+ {
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+ public Texts Value { get => (Texts)GetValue(ValueProperty); set => SetValue(ValueProperty, value); }
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+ public static readonly DependencyProperty ValueProperty
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+ = DependencyProperty.Register(nameof(Value), typeof(Texts), typeof(UserControl1),
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+ new PropertyMetadata(new Texts()));
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+
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+ public UserControl1() => InitializeComponent();
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+ }
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+ }
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+ ```
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+
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+ ```xml:UserControl2.xaml
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+ <UserControl
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+ x:Class="Questions359857.UserControl2"
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+ xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
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+ xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
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+ <StackPanel>
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+ <HeaderedContentControl Header="A">
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+ <TextBox Text="{Binding A, UpdateSourceTrigger=PropertyChanged}" />
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+ </HeaderedContentControl>
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+ <HeaderedContentControl Header="B">
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+ <TextBox Text="{Binding B, UpdateSourceTrigger=PropertyChanged}" />
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+ </HeaderedContentControl>
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+ <HeaderedContentControl Header="C">
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+ <TextBox Text="{Binding C, UpdateSourceTrigger=PropertyChanged}" />
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+ </HeaderedContentControl>
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+ </StackPanel>
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+ </UserControl>
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+ ```
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+
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+ ```cs:UserControl2.xaml.cs
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+ using System.Windows.Controls;
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  namespace Questions359857
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-
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  {
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-
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- public class Texts
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+ public sealed partial class UserControl2 : UserControl
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-
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  {
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-
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- public int A { get; set; } = 5;
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-
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- public string B { get; set; } = "";
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+ public UserControl2() => InitializeComponent();
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- public double? C { get; set; }
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  }
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- public partial class MainWindow : Window
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-
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- {
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- public ReactiveProperty<Texts> ValueA { get; } = new(new Texts { A = 1, B = "Ab", C = 10.0 });
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- public ReactiveProperty<Texts> ValueB { get; } = new(new Texts { A = 2, B = "Bb", C = 222.22 });
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- public ReactiveProperty<Texts> ValueC { get; } = new(new Texts { A = 3, B = "Cb", C = null });
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-
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-
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-
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- public MainWindow()
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-
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- {
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-
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- InitializeComponent();
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- DataContext = this;
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- }
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- }
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  }
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  ```
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- ```xaml
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- <UserControl
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- x:Class="Questions359857.UserControl1"
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-
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- xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
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-
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- xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
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- xmlns:local="clr-namespace:Questions359857"
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- x:Name="userControl1">
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- <StackPanel>
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-
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- <HeaderedContentControl Header="A">
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- <TextBox Text="{Binding Value.A, UpdateSourceTrigger=PropertyChanged, RelativeSource={RelativeSource AncestorType={x:Type local:UserControl1}}}" />
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- </HeaderedContentControl>
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- <HeaderedContentControl Header="B">
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- <TextBox Text="{Binding Value.B, UpdateSourceTrigger=PropertyChanged, ElementName=userControl1}" />
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- </HeaderedContentControl>
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- <HeaderedContentControl DataContext="{Binding RelativeSource={RelativeSource AncestorType={x:Type local:UserControl1}}}" Header="C">
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- <TextBox Text="{Binding Value.C, UpdateSourceTrigger=PropertyChanged}" />
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- </HeaderedContentControl>
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- </StackPanel>
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- </UserControl>
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-
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- ```
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- ```C#
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- using System.Windows;
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-
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- using System.Windows.Controls;
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-
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-
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-
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- namespace Questions359857
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-
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- {
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- public partial class UserControl1 : UserControl
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-
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- {
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- public Texts Value { get => (Texts)GetValue(ValueProperty); set => SetValue(ValueProperty, value); }
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- public static readonly DependencyProperty ValueProperty
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- = DependencyProperty.Register(nameof(Value), typeof(Texts), typeof(UserControl1),
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- new PropertyMetadata(new Texts()));
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- public UserControl1() => InitializeComponent();
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- }
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- }
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- ```
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- ```xaml
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- <UserControl
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- x:Class="Questions359857.UserControl2"
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- xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
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- xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
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- <StackPanel>
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-
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- <HeaderedContentControl Header="A">
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- <TextBox Text="{Binding A, UpdateSourceTrigger=PropertyChanged}" />
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- </HeaderedContentControl>
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- <HeaderedContentControl Header="B">
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- <TextBox Text="{Binding B, UpdateSourceTrigger=PropertyChanged}" />
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- </HeaderedContentControl>
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- <HeaderedContentControl Header="C">
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- <TextBox Text="{Binding C, UpdateSourceTrigger=PropertyChanged}" />
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- </HeaderedContentControl>
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-
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- </StackPanel>
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- </UserControl>
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- ```
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- ```C#
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-
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- using System.Windows.Controls;
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-
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-
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- namespace Questions359857
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-
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- {
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- public sealed partial class UserControl2 : UserControl
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- {
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- public UserControl2() => InitializeComponent();
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- }
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- }
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- ```