c# - DocumentViewer ツールバーで作成されたコントロールを見つける方法は?

Question

のツールバーに、現在のページ番号を表示するためのTextBoxコントロールを作成しました。DocumentViewerユーザーに GoTo タイプの機能を提供します。

以下はコードです：

<Style x:Key="DocumentViewerStyle1" BasedOn="{x:Null}" TargetType="{x:Type DocumentViewer}">
        <Setter Property="Foreground" Value="{DynamicResource {x:Static SystemColors.WindowTextBrushKey}}"/>
        <Setter Property="Background" Value="{DynamicResource {x:Static SystemColors.ControlBrushKey}}"/>
        <Setter Property="FocusVisualStyle" Value="{x:Null}"/>
        <Setter Property="ContextMenu" Value="{DynamicResource {ComponentResourceKey ResourceId=PUIDocumentViewerContextMenu, TypeInTargetAssembly={x:Type System_Windows_Documents:PresentationUIStyleResources}}}"/>
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="{x:Type DocumentViewer}">
                    <Border BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" Focusable="False">
                        <Grid Background="{TemplateBinding Background}" KeyboardNavigation.TabNavigation="Local">
                            <Grid.ColumnDefinitions>
                                <ColumnDefinition Width="*"/>
                            </Grid.ColumnDefinitions>
                            <Grid.RowDefinitions>
                                <RowDefinition Height="Auto"/>
                                <RowDefinition Height="*"/>
                                <RowDefinition Height="Auto"/>
                            </Grid.RowDefinitions>
                            <ContentControl Grid.Column="0" Focusable="{TemplateBinding Focusable}" Grid.Row="0" Style="{DynamicResource ContentControlStyle1}" TabIndex="0"/>
                            <ScrollViewer x:Name="PART_ContentHost" CanContentScroll="true" Grid.Column="0" Focusable="{TemplateBinding Focusable}" HorizontalScrollBarVisibility="Auto" IsTabStop="true" Grid.Row="1" TabIndex="1"/>
                            <DockPanel Grid.Row="1">
                                <FrameworkElement DockPanel.Dock="Right" Width="{DynamicResource {x:Static SystemParameters.VerticalScrollBarWidthKey}}"/>
                                <Rectangle Height="10" Visibility="Visible" VerticalAlignment="top">
                                    <Rectangle.Fill>
                                        <LinearGradientBrush EndPoint="0,1" StartPoint="0,0">
                                            <LinearGradientBrush.GradientStops>
                                                <GradientStopCollection>
                                                    <GradientStop Color="#66000000" Offset="0"/>
                                                    <GradientStop Color="Transparent" Offset="1"/>
                                                </GradientStopCollection>
                                            </LinearGradientBrush.GradientStops>
                                        </LinearGradientBrush>
                                     </Rectangle.Fill>
                                </Rectangle>

                                <!--<Image Grid.Column="0" Grid.Row="2" Width="100"/>-->
                            </DockPanel>
                            <!--<TextBlock Grid.Row="2" Grid.Column="0" x:Name="txtBlock" Text="Hello World"/>-->
                            <ContentControl x:Name="PART_FindToolBarHost" Grid.Column="0" Focusable="{TemplateBinding Focusable}" Grid.Row="2" TabIndex="2"/>
                            <TextBlock Text="Aspire Education" Grid.Row="2" Grid.Column="0" Margin="300,0,0,0" Foreground="#FF0758DC" FontSize="18" />
                        </Grid>
                    </Border>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>
    <Style x:Key="ContentControlStyle1" TargetType="{x:Type ContentControl}">
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="{x:Type ContentControl}">
                    <ToolBar Focusable="{TemplateBinding Focusable}" ToolBarTray.IsLocked="True" Language="en-us" KeyboardNavigation.TabNavigation="Continue" Uid="ToolBar_2">
                        <Button x:Name="PrintButton" Background="{DynamicResource {ComponentResourceKey ResourceId=PUIDocumentViewerPrintButton, TypeInTargetAssembly={x:Type System_Windows_Documents:PresentationUIStyleResources}}}" CommandTarget="{Binding TemplatedParent, RelativeSource={RelativeSource TemplatedParent}}" Command="ApplicationCommands.Print" IsTabStop="True" Margin="2" Padding="2" Style="{DynamicResource {ComponentResourceKey ResourceId=PUIDocumentViewerButtonStyle, TypeInTargetAssembly={x:Type System_Windows_Documents:PresentationUIStyleResources}}}" ToolTipService.ShowOnDisabled="True" TabIndex="0" ToolTip="Print (Ctrl+P)" Uid="Button_14" VerticalAlignment="Center" Width="24"/>
                        <Button x:Name="CopyButton" Background="{DynamicResource {ComponentResourceKey ResourceId=PUIDocumentViewerCopyButton, TypeInTargetAssembly={x:Type System_Windows_Documents:PresentationUIStyleResources}}}" CommandTarget="{Binding TemplatedParent, RelativeSource={RelativeSource TemplatedParent}}" Command="ApplicationCommands.Copy" IsTabStop="True" Margin="2" Padding="2" Style="{DynamicResource {ComponentResourceKey ResourceId=PUIDocumentViewerButtonStyle, TypeInTargetAssembly={x:Type System_Windows_Documents:PresentationUIStyleResources}}}" ToolTipService.ShowOnDisabled="True" TabIndex="1" ToolTip="Copy (Ctrl+C)" Uid="Button_15" VerticalAlignment="Center" Width="24"/>
                        <Separator Uid="Separator_110"/>
                        <Button x:Name="ZoomInButton" Background="{DynamicResource {ComponentResourceKey ResourceId=PUIDocumentViewerZoomInButton, TypeInTargetAssembly={x:Type System_Windows_Documents:PresentationUIStyleResources}}}" CommandTarget="{Binding TemplatedParent, RelativeSource={RelativeSource TemplatedParent}}" Command="NavigationCommands.IncreaseZoom" IsTabStop="True" Margin="2" Padding="2" Style="{DynamicResource {ComponentResourceKey ResourceId=PUIDocumentViewerButtonStyle, TypeInTargetAssembly={x:Type System_Windows_Documents:PresentationUIStyleResources}}}" ToolTipService.ShowOnDisabled="True" TabIndex="3" ToolTip="Increase the size of the content (Ctrl +)" Uid="Button_16" VerticalAlignment="Center" Width="24"/>
                        <Button x:Name="ZoomOutButton" Background="{DynamicResource {ComponentResourceKey ResourceId=PUIDocumentViewerZoomOutButton, TypeInTargetAssembly={x:Type System_Windows_Documents:PresentationUIStyleResources}}}" CommandTarget="{Binding TemplatedParent, RelativeSource={RelativeSource TemplatedParent}}" Command="NavigationCommands.DecreaseZoom" IsTabStop="True" Margin="2" Padding="2" Style="{DynamicResource {ComponentResourceKey ResourceId=PUIDocumentViewerButtonStyle, TypeInTargetAssembly={x:Type System_Windows_Documents:PresentationUIStyleResources}}}" ToolTipService.ShowOnDisabled="True" TabIndex="4" ToolTip="Decrease the size of the content (Ctrl -)" Uid="Button_17" VerticalAlignment="Center" Width="24"/>
                        <Separator Uid="Separator_111"/>
                        <Button x:Name="ActualSizeButton" Background="{DynamicResource {ComponentResourceKey ResourceId=PUIDocumentViewerActualSizeButton, TypeInTargetAssembly={x:Type System_Windows_Documents:PresentationUIStyleResources}}}" CommandTarget="{Binding TemplatedParent, RelativeSource={RelativeSource TemplatedParent}}" CommandParameter="100.0" Command="NavigationCommands.Zoom" IsTabStop="True" Margin="2" Padding="2" Style="{DynamicResource ButtonStyle1}" ToolTipService.ShowOnDisabled="True" TabIndex="5" ToolTip="100% (Ctrl+1)" Uid="Button_18" VerticalAlignment="Center" Width="24"/>
                        <Button x:Name="PageWidthButton" Background="{DynamicResource {ComponentResourceKey ResourceId=PUIDocumentViewerPageWidthButton, TypeInTargetAssembly={x:Type System_Windows_Documents:PresentationUIStyleResources}}}" CommandTarget="{Binding TemplatedParent, RelativeSource={RelativeSource TemplatedParent}}" Command="DocumentViewer.FitToWidthCommand" IsTabStop="True" Margin="2" Padding="2" Style="{DynamicResource {ComponentResourceKey ResourceId=PUIDocumentViewerButtonStyle, TypeInTargetAssembly={x:Type System_Windows_Documents:PresentationUIStyleResources}}}" ToolTipService.ShowOnDisabled="True" TabIndex="6" ToolTip="Page Width (Ctrl+2)" Uid="Button_19" VerticalAlignment="Center" Width="24"/>
                        <Button x:Name="WholePageButton" Background="{DynamicResource {ComponentResourceKey ResourceId=PUIDocumentViewerWholePageButton, TypeInTargetAssembly={x:Type System_Windows_Documents:PresentationUIStyleResources}}}" CommandTarget="{Binding TemplatedParent, RelativeSource={RelativeSource TemplatedParent}}" CommandParameter="1" Command="DocumentViewer.FitToMaxPagesAcrossCommand" IsTabStop="True" Margin="2" Padding="2" Style="{DynamicResource {ComponentResourceKey ResourceId=PUIDocumentViewerButtonStyle, TypeInTargetAssembly={x:Type System_Windows_Documents:PresentationUIStyleResources}}}" ToolTipService.ShowOnDisabled="True" TabIndex="7" ToolTip="Whole Page (Ctrl+3)" Uid="Button_20" VerticalAlignment="Center" Width="24"/>
                        <Button x:Name="TwoPagesButton" Background="{DynamicResource {ComponentResourceKey ResourceId=PUIDocumentViewerTwoPagesButton, TypeInTargetAssembly={x:Type System_Windows_Documents:PresentationUIStyleResources}}}" CommandTarget="{Binding TemplatedParent, RelativeSource={RelativeSource TemplatedParent}}" CommandParameter="2" Command="DocumentViewer.FitToMaxPagesAcrossCommand" IsTabStop="True" Margin="2" Padding="2" Style="{DynamicResource {ComponentResourceKey ResourceId=PUIDocumentViewerButtonStyle, TypeInTargetAssembly={x:Type System_Windows_Documents:PresentationUIStyleResources}}}" ToolTipService.ShowOnDisabled="True" TabIndex="8" ToolTip="Two Pages (Ctrl+4)" Uid="Button_21" VerticalAlignment="Center" Width="24"/>
                        <Separator Uid="Separator_112"/>
                        <TextBox x:Name="txtCurrentPage" Text="580" Width="30" BorderBrush="Black" TextChanged="txtCurrentPage_TextChanged"></TextBox>
                        <TextBox x:Name="txtTotalPage" Text="/250" Width="40" IsReadOnly="True" BorderBrush="Black" Foreground="Black"></TextBox>
                    </ToolBar>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>

しかし、そのテキストボックスにアクセスしようとすると、null が表示されます。

これが私のコードビハインドです。

    private void txtCurrentPage_TextChanged(object sender, TextChangedEventArgs e)
    {
        MainWindow mn = new MainWindow();
        TextBox tb = (TextBox)mn.FindName("txtCurrentPage");

        if (tb != null)
        {
            DocumentViewerReading.GoToPage(Convert.ToInt32(tb.Text));
        }
    }

助けてください

Answer 1

コントロールを再度見つける必要はありません。その参照は送信者パラメーターにある必要があります。

private void txtCurrentPage_TextChanged(object sender, TextChangedEventArgs e)
    {
        TextBox tb = (TextBox)sender;

        if (tb != null)
        {
            DocumentViewerReading.GoToPage(Convert.ToInt32(tb.Text));
        }
    }

テキスト ボックスの内容が変更されるたびにウィンドウの新しいインスタンスを作成し、その新しいウィンドウ内でテキスト ボックスを検索しようとしましたが、これは本来の動作ではありません。ユーザーはそれに入力しています。

Answer 2

以下は完全な解決策です:-

<Style x:Key="DocumentViewerStyle1" BasedOn="{x:Null}" TargetType="{x:Type DocumentViewer}">
        <Setter Property="Foreground" Value="{DynamicResource {x:Static SystemColors.WindowTextBrushKey}}"/>
        <Setter Property="Background" Value="{DynamicResource {x:Static SystemColors.ControlBrushKey}}"/>
        <Setter Property="FocusVisualStyle" Value="{x:Null}"/>
        <Setter Property="ContextMenu" Value="{DynamicResource {ComponentResourceKey ResourceId=PUIDocumentViewerContextMenu, TypeInTargetAssembly={x:Type System_Windows_Documents:PresentationUIStyleResources}}}"/>
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="{x:Type DocumentViewer}">
                    <Border BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" Focusable="False">
                        <Grid x:Name="grdDocumentViewer" Background="{TemplateBinding Background}" KeyboardNavigation.TabNavigation="Local">
                            <Grid.ColumnDefinitions>
                                <ColumnDefinition Width="*"/>
                            </Grid.ColumnDefinitions>
                            <Grid.RowDefinitions>
                                <RowDefinition Height="Auto"/>
                                <RowDefinition Height="*"/>
                                <RowDefinition Height="Auto"/>
                            </Grid.RowDefinitions>
                            <ContentControl Grid.Column="0" Focusable="{TemplateBinding Focusable}" Grid.Row="0" Style="{DynamicResource ContentControlStyle1}" TabIndex="0"/>
                            <ScrollViewer x:Name="PART_ContentHost" CanContentScroll="true" Grid.Column="0" Focusable="{TemplateBinding Focusable}" HorizontalScrollBarVisibility="Auto" IsTabStop="true" Grid.Row="1" TabIndex="1"/>
                            <DockPanel Grid.Row="1">
                                <FrameworkElement DockPanel.Dock="Right" Width="{DynamicResource {x:Static SystemParameters.VerticalScrollBarWidthKey}}"/>
                                <Rectangle Height="10" Visibility="Visible" VerticalAlignment="top">
                                    <Rectangle.Fill>
                                        <LinearGradientBrush EndPoint="0,1" StartPoint="0,0">
                                            <LinearGradientBrush.GradientStops>
                                                <GradientStopCollection>
                                                    <GradientStop Color="#66000000" Offset="0"/>
                                                    <GradientStop Color="Transparent" Offset="1"/>
                                                </GradientStopCollection>
                                            </LinearGradientBrush.GradientStops>
                                        </LinearGradientBrush>
                                    </Rectangle.Fill>
                                </Rectangle>

                                <!--<Image Grid.Column="0" Grid.Row="2" Width="100"/>-->
                            </DockPanel>
                            <!--<TextBlock Grid.Row="2" Grid.Column="0" x:Name="txtBlock" Text="Hello World"/>-->
                            <ContentControl x:Name="PART_FindToolBarHost" Grid.Column="0" Focusable="{TemplateBinding Focusable}" HorizontalAlignment="Right" Margin="0,0,20,0" Grid.Row="0" TabIndex="2"/>
                            <TextBlock x:Name="tbTopicName" Text="" Grid.Row="0" Grid.Column="0" HorizontalAlignment="Center" Margin="0,2,0,0" Foreground="#FF0758DC" FontSize="20" />
                        </Grid>
                    </Border>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>

//以下はコード ビハインドです

Grid gMain = (Grid)DocumentViewerReading.Template.FindName("grdDocumentViewer", DocumentViewerReading);
        TextBlock tb = (TextBlock)gMain.FindName("tbTopicName");
        tb.Text = header;

それでおしまい。そして、ありがとうアンディ。