回答編集履歴

見直しキャンペーン中

2023/07/25 13:52

投稿

TN8001

スコア9326

test CHANGED Viewed

@@ -1,367 +1,176 @@
 おそらくダイアログ云々は関係なくて、`MainWindow`に置いても出ないんじゃないでしょうか？
 現象から推測すると、
 * `XXX.xaml`で`AutoWireViewModel="True"`された上`XXXViewModel`がある
-つまり`DataContext`が違うのではないかということです。
+  つまり`DataContext`が違うのではないかということです。
 * `XXX.xaml`の`Param`を表示するコントロールで`RelativeSource`忘れ
-`DependencyProperty`の`Param`を中からバインドするなら、`FindAncestor`がいると思いますができていない？
+  `DependencyProperty`の`Param`を中からバインドするなら、`FindAncestor`がいると思いますができていない？
 どちらにせよ「出力」ウィンドウや「XAML バインド エラー」ウィンドウに、エラー表示が出ます。
 エラーが出ていなければはずれですので、`XXX.xaml`・`XXX.xaml.cs`も追記してください。
 > DependencyProperty で実装しており、デバッガ で確認したところ、その setter も呼ばれていない
 CLRプロパティラッパーが呼ばれないのは仕様です。直接`SetValue`が呼ばれます。
 [XAML Loading and Dependency Properties - WPF .NET Framework | Microsoft Docs](https://docs.microsoft.com/ja-jp/dotnet/desktop/wpf/advanced/xaml-loading-and-dependency-properties)
 ---
 検証コード
-Dialog.xaml
+```xml:Dialog.xaml
-```xaml
 <UserControl
   x:Class="Questions309079.Views.Dialog"
   xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
   xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
   xmlns:local="clr-namespace:Questions309079.Views"
   xmlns:prism="http://prismlibrary.com/"
   x:Name="dialog"
   prism:ViewModelLocator.AutoWireViewModel="True">
   <StackPanel>
     <GroupBox Margin="5" Header="Dialog VM ⇆ XXX DP">
       <local:XXX
         x:Name="XXX"
         Param1="{Binding DataContext.Param1.Value, ElementName=dialog, Mode=TwoWay}"
         Param2="{Binding DataContext.Param2.Value, ElementName=dialog, Mode=TwoWay}" />
     </GroupBox>
     <GroupBox Margin="5" Header="XXX DP ⇆ XXX VM">
       <local:XXX
         Param1="{Binding Param1.Value, Mode=TwoWay}"
         Param2="{Binding Param2.Value, Mode=TwoWay}" />
     </GroupBox>
     <GroupBox Margin="5" Header="Dialog VM ⇆ XXX DP ⇆ XXX VM">
       <TextBlock Text="こういうことをしようとしている？？&#xa;だったらXXX DPもXXX VMもいらんでしょ？という話" />
     </GroupBox>
     <GroupBox Margin="5" Header="Dialog">
       <StackPanel>
         <HeaderedContentControl Header="Dialog VM Param1">
           <TextBox Text="{Binding Param1.Value, UpdateSourceTrigger=PropertyChanged}" />
         </HeaderedContentControl>
         <HeaderedContentControl Header="Dialog VM Param2">
           <TextBox Text="{Binding Param2.Value, UpdateSourceTrigger=PropertyChanged}" />
         </HeaderedContentControl>
       </StackPanel>
     </GroupBox>
   </StackPanel>
 </UserControl>
 ```
-DialogViewModel.cs
+```cs:DialogViewModel.cs
-```C#
 using Prism.Mvvm;
 using Prism.Services.Dialogs;
 using Reactive.Bindings;
 using System;
 namespace Questions309079.ViewModels
 {
     public class DialogViewModel : BindableBase, IDialogAware
     {
         public ReactiveProperty<string> Param1 { get; } = new ReactiveProperty<string>("aaa");
         public ReactiveProperty<string> Param2 { get; } = new ReactiveProperty<string>("bbb");
         public string Title => "Dialog";
         public event Action<IDialogResult> RequestClose;
         public void OnDialogOpened(IDialogParameters parameters)
         {
             Param1.Value = "ABC";
             Param2.Value = "DEF";
         }
         public void RaiseRequestClose(IDialogResult dialogResult) => RequestClose?.Invoke(dialogResult);
         public bool CanCloseDialog() => true;
         public void OnDialogClosed() { }
     }
 }
 ```
 ---
-XXX.xaml
+```xml:XXX.xaml
-```xaml
 <UserControl
   x:Class="Questions309079.Views.XXX"
   xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
   xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
   xmlns:local="clr-namespace:Questions309079.Views"
   xmlns:prism="http://prismlibrary.com/"
   prism:ViewModelLocator.AutoWireViewModel="True">
   <Grid>
     <Grid.ColumnDefinitions>
       <ColumnDefinition />
       <ColumnDefinition />
     </Grid.ColumnDefinitions>
     <StackPanel>
       <HeaderedContentControl Header="XXX DP Param1">
         <TextBox Text="{Binding Param1, RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type local:XXX}}, UpdateSourceTrigger=PropertyChanged}" />
       </HeaderedContentControl>
       <HeaderedContentControl Header="XXX DP Param2">
         <TextBox Text="{Binding Param2, RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type local:XXX}}, UpdateSourceTrigger=PropertyChanged}" />
       </HeaderedContentControl>
     </StackPanel>
     <StackPanel Grid.Column="1">
       <HeaderedContentControl Header="XXX VM Param1">
         <TextBox Text="{Binding Param1.Value, UpdateSourceTrigger=PropertyChanged}" />
       </HeaderedContentControl>
       <HeaderedContentControl Header="XXX VM Param2">
         <TextBox Text="{Binding Param2.Value, UpdateSourceTrigger=PropertyChanged}" />
       </HeaderedContentControl>
     </StackPanel>
   </Grid>
 </UserControl>
 ```
-XXX.xaml.cs
+```cs:XXX.xaml.cs
-```C#
 using System.Diagnostics;
 using System.Windows;
 using System.Windows.Controls;
 namespace Questions309079.Views
 {
     public partial class XXX : UserControl
     {
         public string Param1
         {
             get => (string)GetValue(Param1Property);
             set
             {
                 Debug.WriteLine($"setter:{Param1}->{value}");
                 SetValue(Param1Property, value);
             }
         }
         public static readonly DependencyProperty Param1Property
             = DependencyProperty.Register(nameof(Param1), typeof(string), typeof(XXX),
                 new PropertyMetadata(string.Empty, OnParam1Changed));
         private static void OnParam1Changed(DependencyObject d, DependencyPropertyChangedEventArgs e)
             => Debug.WriteLine($"OnParam1Changed:{e.OldValue}->{e.NewValue}");
         public string Param2 { get => (string)GetValue(Param2Property); set => SetValue(Param2Property, value); }
         public static readonly DependencyProperty Param2Property
             = DependencyProperty.Register(nameof(Param2), typeof(string), typeof(XXX),
                 new PropertyMetadata(string.Empty));
         public XXX() => InitializeComponent();
     }
 }
 ```
-XXXViewModel.cs
+```cs:XXXViewModel.cs
-```C#
 using Reactive.Bindings;
 namespace Questions309079.ViewModels
 {
     public class XXXViewModel
     {
         public ReactiveProperty<string> Param1 { get; } = new ReactiveProperty<string>("aaa");
         public ReactiveProperty<string> Param2 { get; } = new ReactiveProperty<string>("bbb");
     }
 }
 ```
 ![アプリ画像](cc96a7a1d584cf8c258b9ec28dbc10f0.png)

（さらにわかりやすく）更新しました。

2020/12/14 04:25

投稿

TN8001

スコア9326

test CHANGED Viewed

@@ -38,13 +38,13 @@
+検証コード
-### XXXViewModel は必要
+Dialog.xaml
-`XXX`作成時に`XXXViewModel`が`DataContext`に差し込まれますから、`Param.Value`は他から取ってくることになります。
 ```xaml
@@ -66,9 +66,59 @@
   <StackPanel>
+    <GroupBox Margin="5" Header="Dialog VM ⇆ XXX DP">
+      <local:XXX
+        x:Name="XXX"
+        Param1="{Binding DataContext.Param1.Value, ElementName=dialog, Mode=TwoWay}"
-    <local:XXX x:Name="XXX" Param="{Binding DataContext.Param.Value, ElementName=dialog, Mode=TwoWay}" />
+        Param2="{Binding DataContext.Param2.Value, ElementName=dialog, Mode=TwoWay}" />
+    </GroupBox>
+    <GroupBox Margin="5" Header="XXX DP ⇆ XXX VM">
+      <local:XXX
+        Param1="{Binding Param1.Value, Mode=TwoWay}"
+        Param2="{Binding Param2.Value, Mode=TwoWay}" />
+    </GroupBox>
+    <GroupBox Margin="5" Header="Dialog VM ⇆ XXX DP ⇆ XXX VM">
+      <TextBlock Text="こういうことをしようとしている？？&#xa;だったらXXX DPもXXX VMもいらんでしょ？という話" />
+    </GroupBox>
+    <GroupBox Margin="5" Header="Dialog">
+      <StackPanel>
+        <HeaderedContentControl Header="Dialog VM Param1">
-    <TextBox Text="{Binding Param.Value, UpdateSourceTrigger=PropertyChanged}" />
+          <TextBox Text="{Binding Param1.Value, UpdateSourceTrigger=PropertyChanged}" />
+        </HeaderedContentControl>
+        <HeaderedContentControl Header="Dialog VM Param2">
+          <TextBox Text="{Binding Param2.Value, UpdateSourceTrigger=PropertyChanged}" />
+        </HeaderedContentControl>
+      </StackPanel>
+    </GroupBox>
   </StackPanel>
@@ -78,6 +128,74 @@
+DialogViewModel.cs
+```C#
+using Prism.Mvvm;
+using Prism.Services.Dialogs;
+using Reactive.Bindings;
+using System;
+namespace Questions309079.ViewModels
+{
+    public class DialogViewModel : BindableBase, IDialogAware
+    {
+        public ReactiveProperty<string> Param1 { get; } = new ReactiveProperty<string>("aaa");
+        public ReactiveProperty<string> Param2 { get; } = new ReactiveProperty<string>("bbb");
+        public string Title => "Dialog";
+        public event Action<IDialogResult> RequestClose;
+        public void OnDialogOpened(IDialogParameters parameters)
+        {
+            Param1.Value = "ABC";
+            Param2.Value = "DEF";
+        }
+        public void RaiseRequestClose(IDialogResult dialogResult) => RequestClose?.Invoke(dialogResult);
+        public bool CanCloseDialog() => true;
+        public void OnDialogClosed() { }
+    }
+}
+```
+---
+XXX.xaml
 ```xaml
 <UserControl
@@ -94,15 +212,51 @@
   prism:ViewModelLocator.AutoWireViewModel="True">
+  <Grid>
+    <Grid.ColumnDefinitions>
+      <ColumnDefinition />
+      <ColumnDefinition />
+    </Grid.ColumnDefinitions>
-  <StackPanel>
+    <StackPanel>
-    <HeaderedContentControl Header="Param">
+      <HeaderedContentControl Header="XXX DP Param1">
-      <TextBox Text="{Binding Param, RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type local:XXX}}, UpdateSourceTrigger=PropertyChanged}" />
+        <TextBox Text="{Binding Param1, RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type local:XXX}}, UpdateSourceTrigger=PropertyChanged}" />
-    </HeaderedContentControl>
+      </HeaderedContentControl>
+      <HeaderedContentControl Header="XXX DP Param2">
+        <TextBox Text="{Binding Param2, RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type local:XXX}}, UpdateSourceTrigger=PropertyChanged}" />
+      </HeaderedContentControl>
-  </StackPanel>
+    </StackPanel>
+    <StackPanel Grid.Column="1">
+      <HeaderedContentControl Header="XXX VM Param1">
+        <TextBox Text="{Binding Param1.Value, UpdateSourceTrigger=PropertyChanged}" />
+      </HeaderedContentControl>
+      <HeaderedContentControl Header="XXX VM Param2">
+        <TextBox Text="{Binding Param2.Value, UpdateSourceTrigger=PropertyChanged}" />
+      </HeaderedContentControl>
+    </StackPanel>
+  </Grid>
 </UserControl>
@@ -110,66 +264,104 @@
-### XXXViewModel はなくてもいい
-`XXXViewModel`はカラか、`DialogViewModel`に移しても問題ない場合。
-`XXX`で`AutoWireViewModel="False"`すればいいですが、そもそも`DependencyProperty`がいらなくなってしまいますね^^;
-```xaml
-<UserControl
-  x:Class="Questions309079.Views.Dialog"
-  xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
-  xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
-  xmlns:local="clr-namespace:Questions309079.Views"
-  xmlns:prism="http://prismlibrary.com/"
-  prism:ViewModelLocator.AutoWireViewModel="True">
-  <StackPanel>
-    <local:XXX x:Name="XXX" />
-    <TextBox Text="{Binding Param.Value, UpdateSourceTrigger=PropertyChanged}" />
-  </StackPanel>
-</UserControl>
-```
-```xaml
-<UserControl
-  x:Class="Questions309079.Views.XXX"
-  xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
-  xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
-  <StackPanel>
-    <HeaderedContentControl Header="Param">
-      <TextBox Text="{Binding Param.Value, UpdateSourceTrigger=PropertyChanged}" />
-    </HeaderedContentControl>
-  </StackPanel>
-</UserControl>
-```
+XXX.xaml.cs
+```C#
+using System.Diagnostics;
+using System.Windows;
+using System.Windows.Controls;
+namespace Questions309079.Views
+{
+    public partial class XXX : UserControl
+    {
+        public string Param1
+        {
+            get => (string)GetValue(Param1Property);
+            set
+            {
+                Debug.WriteLine($"setter:{Param1}->{value}");
+                SetValue(Param1Property, value);
+            }
+        }
+        public static readonly DependencyProperty Param1Property
+            = DependencyProperty.Register(nameof(Param1), typeof(string), typeof(XXX),
+                new PropertyMetadata(string.Empty, OnParam1Changed));
+        private static void OnParam1Changed(DependencyObject d, DependencyPropertyChangedEventArgs e)
+            => Debug.WriteLine($"OnParam1Changed:{e.OldValue}->{e.NewValue}");
+        public string Param2 { get => (string)GetValue(Param2Property); set => SetValue(Param2Property, value); }
+        public static readonly DependencyProperty Param2Property
+            = DependencyProperty.Register(nameof(Param2), typeof(string), typeof(XXX),
+                new PropertyMetadata(string.Empty));
+        public XXX() => InitializeComponent();
+    }
+}
+```
+XXXViewModel.cs
+```C#
+using Reactive.Bindings;
+namespace Questions309079.ViewModels
+{
+    public class XXXViewModel
+    {
+        public ReactiveProperty<string> Param1 { get; } = new ReactiveProperty<string>("aaa");
+        public ReactiveProperty<string> Param2 { get; } = new ReactiveProperty<string>("bbb");
+    }
+}
+```
+![アプリ画像](cc96a7a1d584cf8c258b9ec28dbc10f0.png)

xaml追加

2020/12/14 04:25

投稿

TN8001

スコア9326

test CHANGED Viewed

@@ -31,3 +31,145 @@
 [XAML Loading and Dependency Properties - WPF .NET Framework | Microsoft Docs](https://docs.microsoft.com/ja-jp/dotnet/desktop/wpf/advanced/xaml-loading-and-dependency-properties)
+---
+### XXXViewModel は必要
+`XXX`作成時に`XXXViewModel`が`DataContext`に差し込まれますから、`Param.Value`は他から取ってくることになります。
+```xaml
+<UserControl
+  x:Class="Questions309079.Views.Dialog"
+  xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+  xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+  xmlns:local="clr-namespace:Questions309079.Views"
+  xmlns:prism="http://prismlibrary.com/"
+  x:Name="dialog"
+  prism:ViewModelLocator.AutoWireViewModel="True">
+  <StackPanel>
+    <local:XXX x:Name="XXX" Param="{Binding DataContext.Param.Value, ElementName=dialog, Mode=TwoWay}" />
+    <TextBox Text="{Binding Param.Value, UpdateSourceTrigger=PropertyChanged}" />
+  </StackPanel>
+</UserControl>
+```
+```xaml
+<UserControl
+  x:Class="Questions309079.Views.XXX"
+  xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+  xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+  xmlns:local="clr-namespace:Questions309079.Views"
+  xmlns:prism="http://prismlibrary.com/"
+  prism:ViewModelLocator.AutoWireViewModel="True">
+  <StackPanel>
+    <HeaderedContentControl Header="Param">
+      <TextBox Text="{Binding Param, RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type local:XXX}}, UpdateSourceTrigger=PropertyChanged}" />
+    </HeaderedContentControl>
+  </StackPanel>
+</UserControl>
+```
+### XXXViewModel はなくてもいい
+`XXXViewModel`はカラか、`DialogViewModel`に移しても問題ない場合。
+`XXX`で`AutoWireViewModel="False"`すればいいですが、そもそも`DependencyProperty`がいらなくなってしまいますね^^;
+```xaml
+<UserControl
+  x:Class="Questions309079.Views.Dialog"
+  xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+  xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+  xmlns:local="clr-namespace:Questions309079.Views"
+  xmlns:prism="http://prismlibrary.com/"
+  prism:ViewModelLocator.AutoWireViewModel="True">
+  <StackPanel>
+    <local:XXX x:Name="XXX" />
+    <TextBox Text="{Binding Param.Value, UpdateSourceTrigger=PropertyChanged}" />
+  </StackPanel>
+</UserControl>
+```
+```xaml
+<UserControl
+  x:Class="Questions309079.Views.XXX"
+  xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+  xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
+  <StackPanel>
+    <HeaderedContentControl Header="Param">
+      <TextBox Text="{Binding Param.Value, UpdateSourceTrigger=PropertyChanged}" />
+    </HeaderedContentControl>
+  </StackPanel>
+</UserControl>
+```