create MethodBinding MethodExpression ValueExpression

本文详细介绍了如何使用JSF中的表达式工厂创建MethodBinding、MethodExpression及ValueExpression的方法,包括具体的实现步骤和代码示例。
1. create MethodBinding MethodBinding methodBinding = FacesContext.getCurrentInstance().getApplication().createMethodBinding("#{bean.method}", null);

2. create MethodExpression
ExpressionFactory expFactory = FacesContext.getCurrentInstance().
getApplication().getExpressionFactory();
ELContext elContext = FacesContext.getCurrentInstance().getELContext();
MethodExpression expression = expFactory.createMethodExpression(elContext, "actionName", String.class, new Class[]{});

commandComponent.setActionExpression(expression);

3. create ValueExpression
ValueExpression valueExpression = expFactory.createValueExpression(elContext, "#{bean.value}", String.class);
严重性 计数 数据上下文 绑定路径 目标 目标类型 说明 文件 行 项目 错误 3 IraiClsBtnModel Background ToggleButton.Background,名称=“toggleButton” Brush 在类型为 IraiClsBtnModel 的对象上找不到 Background 属性。 62 解决一下 <Window x:Class="JAFRSAO02010.Views.JAFRSAO02010View" 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" xmlns:local="clr-namespace:JAFRSAO02010.Views" xmlns:lib="clr-namespace:JAFCommon.UserControls;assembly=JAFCommon" xmlns:behaviors="http://schemas.microsoft.com/xaml/behaviors" xmlns:sys="clr-namespace:System;assembly=mscorlib" mc:Ignorable="d" Title="依頼区分選択画面" Height="650" Width="770" WindowStyle="None" AllowsTransparency="True" VerticalAlignment="Top"> <Window.Resources> <ResourceDictionary> <ResourceDictionary.MergedDictionaries> <ResourceDictionary Source="pack://application:,,,/JAFCommon;component/UserControls/Generic.xaml"/> </ResourceDictionary.MergedDictionaries> </ResourceDictionary> </Window.Resources> <Window.InputBindings> <KeyBinding Key="F1" Command="{Binding F1Command}"/> <KeyBinding Key="F5" Command="{Binding F5Command}"/> <KeyBinding Key="F12" Command="{Binding F12Command}"/> </Window.InputBindings> <Grid> <Grid.RowDefinitions> <RowDefinition Height="Auto"></RowDefinition> <RowDefinition Height="1*"></RowDefinition> <RowDefinition Height="Auto"></RowDefinition> </Grid.RowDefinitions> <!-- ヘッダー部分--> <Grid MouseLeftButtonDown="WindowTitle_MouseLeftButtonDown"> <Border x:Name="Header" Background="{x:Static lib:JAFCommonConstants.SOLIDCOLOR_COMMON_BASE}" Height="35" VerticalAlignment="Top" Panel.ZIndex="1"> <lib:JAFCommonLabel x:Name="lblHeaderWindowTitle" Content="{Binding WindowTitle}" VerticalAlignment="Top" Margin="5,10,5,0" FontSize="{x:Static lib:JAFCommonConstants.FONT12}" FontFamily="MS Gothic" Foreground="White" Panel.ZIndex="2"/> </Border> <!-- 閉じるボタン --> <lib:JAFCommonButton x:Name="btnHeaderClose" Click="BtnHeaderCloseClick" Background="#FCF0FE" Foreground="{x:Static lib:JAFCommonConstants.SOLIDCOLOR_COMMON_BASE}" FontWeight="Black" FontSize="{x:Static lib:JAFCommonConstants.FONT18}" FontFamily="MS Gothic" Width="30" Height="30" Panel.ZIndex="10" HorizontalAlignment="Right" HorizontalContentAlignment="Center" VerticalContentAlignment="Center" Padding="0,0,0,0" Margin="5,0,5,0"> <TextBlock VerticalAlignment="Center">×</TextBlock> </lib:JAFCommonButton> </Grid> <!-- フッター --> <Border x:Name="Footer" Background="LightGray" Height="20" VerticalAlignment="Top" Panel.ZIndex="1" Margin="0,0,0,0" Grid.Row="2"> <TextBlock x:Name="FooterMessage" Text="" VerticalAlignment="Center" Margin="5,5,5,5" FontSize="11pt" FontFamily="MS Gothic" Panel.ZIndex="30"/> </Border> <!-- メインコンテンツ --> <Grid Grid.Row="1"> <Grid.RowDefinitions> <RowDefinition Height="20"/> <RowDefinition /> <RowDefinition Height="40"/> </Grid.RowDefinitions> <!-- フッターボタン --> <Grid Grid.Row="1" Margin="0,504,0,-7" Grid.RowSpan="2"> <Grid.ColumnDefinitions> <ColumnDefinition Width="219*"/> <ColumnDefinition Width="551*"/> </Grid.ColumnDefinitions> <lib:JAFCommonButton x:Name="btnSelect" Margin="251,0,0,0" VerticalAlignment="Center" Height="50" HorizontalAlignment="Left" Width="100" TabIndex="19" Command="{Binding F12Command}" Grid.Column="1"> <TextBlock Text="[F12] 選択" TextAlignment="Center" HorizontalAlignment="Center" LineHeight="16" LineStackingStrategy="BlockLineHeight" TextWrapping="Wrap" IsEnabled="{Binding IsF12Enabled}" /> </lib:JAFCommonButton> <lib:JAFCommonButton x:Name="btnClose" Margin="200,0,0,0" HorizontalAlignment="Left" VerticalAlignment="Center" Width="100" TabIndex="18" Height="50" Command="{Binding F1Command}" Grid.ColumnSpan="2"> <TextBlock Text="[F1] 閉じる" TextAlignment="Center" HorizontalAlignment="Center" TextWrapping="Wrap" LineHeight="16" LineStackingStrategy="BlockLineHeight"/> </lib:JAFCommonButton> </Grid> <!-- タブコントロール --> <Border Background="{x:Static lib:JAFCommonConstants.SOLIDCOLOR_COMMON_BASE}" Panel.ZIndex="1" Grid.RowSpan="2" VerticalAlignment="Top"> <lib:JAFCommonTabControl BorderThickness="0" SelectedIndex="{Binding TabIndex}" Panel.ZIndex="1" Grid.RowSpan="2" Height="531" > <!-- 分類選択タブ --> <TabItem Header="分類選択" x:Name="tbClsSelect" TabIndex="1" Padding="10,0,10,0" Margin="2,0,2,4"> <behaviors:Interaction.Triggers> <behaviors:EventTrigger EventName="PreviewMouseLeftButtonDown"> <behaviors:CallMethodAction MethodName="ClsSelectClick" TargetObject="{Binding}" /> </behaviors:EventTrigger> </behaviors:Interaction.Triggers> <Grid Height="505" Margin="0,0,3,0"> <!-- メインコンテンツエリア --> <Grid Grid.Row="1" Margin="0,0,0,30"> <Grid.RowDefinitions> <RowDefinition Height="92*"/> <RowDefinition Height="399*"/> </Grid.RowDefinitions> <!-- 分類選択タブ内容 --> <Grid Height="92" VerticalAlignment="Center" > <!-- 依頼区分ボタン群 --> <ItemsControl x:Name="tglbtnIraiClsCC" TabIndex="2" ItemsSource="{Binding IraiClsBtnList,Mode=TwoWay}"> <ItemsControl.ItemsPanel> <ItemsPanelTemplate> <UniformGrid Rows="2" Columns="6"/> </ItemsPanelTemplate> </ItemsControl.ItemsPanel> <ItemsControl.ItemTemplate> <DataTemplate> <lib:JAFCommonToggleButton Content="{Binding IraiClsRyakumei,Mode=TwoWay}" IsChecked="{Binding IsChecked,Mode=TwoWay}" IsEnabled="{Binding IsEnabled,Mode=TwoWay}" Height="36" Width="124" FontSize="16" Margin="1"> <behaviors:Interaction.Triggers> <behaviors:EventTrigger EventName="ToggleClick"> <behaviors:CallMethodAction MethodName="ClsSelectTabIraiClsClick" TargetObject="{Binding DataContext, RelativeSource={RelativeSource AncestorType=ItemsControl}}" /> </behaviors:EventTrigger> </behaviors:Interaction.Triggers> </lib:JAFCommonToggleButton> </DataTemplate> </ItemsControl.ItemTemplate> </ItemsControl> <!-- FAQボタン --> <lib:JAFCommonButton x:Name="btnFAQCC" Content="FAQ" HorizontalAlignment="Left" Margin="636,13,0,0" VerticalAlignment="Top" Height="37" TabIndex="3" Width="62" IsEnabled="{Binding IsFAQEnabled,Mode=TwoWay}"> <behaviors:Interaction.Triggers> <behaviors:EventTrigger EventName="Click"> <behaviors:CallMethodAction MethodName="ClsSelectTabFAQClick" TargetObject="{Binding }" /> </behaviors:EventTrigger> </behaviors:Interaction.Triggers> </lib:JAFCommonButton> <!-- マニュアルボタン --> <lib:JAFCommonButton x:Name="btnManualCC" HorizontalAlignment="Left" TabIndex="4" Margin="698,13,0,0" VerticalAlignment="Top" Height="37" Width="62" IsEnabled="{Binding IsManualEnabled,Mode=TwoWay}"> <behaviors:Interaction.Triggers> <behaviors:EventTrigger EventName="Click"> <behaviors:CallMethodAction MethodName="ClsSelectTabManualClick" TargetObject="{Binding }" /> </behaviors:EventTrigger> </behaviors:Interaction.Triggers> <StackPanel Width="52"> <lib:JAFCommonTextBlock Height="36" Width="36"/> </StackPanel> </lib:JAFCommonButton> </Grid> <!-- 下部コンテンツエリア-分類選択タブ --> <Grid Height="399" VerticalAlignment="Center" Grid.Row="1" > <Grid.ColumnDefinitions> <ColumnDefinition Width="3*"/> <ColumnDefinition Width="6*"/> </Grid.ColumnDefinitions> <!-- 依頼内容(分類選択タブ) --> <Grid Grid.Column="0" Margin="0,5,513,0" Grid.ColumnSpan="2" Height="394" VerticalAlignment="Top"> <lib:JAFCommonListBox x:Name="lstboxIraiContCC" ItemsSource="{Binding IraiContList,Mode=TwoWay}" TabIndex="5" DisplayMemberPath="IraiCont" SelectedIndex="{Binding ContIndex,Mode=TwoWay}" Margin="10,30,0,0" Height="364" Width="246"> <behaviors:Interaction.Triggers> <behaviors:EventTrigger EventName="SelectionChanged"> <behaviors:CallMethodAction MethodName="ClsSelectTabIraiContSelectionChanged" TargetObject="{Binding }" /> </behaviors:EventTrigger> </behaviors:Interaction.Triggers> </lib:JAFCommonListBox> <lib:JAFCommonLabel Content="依頼内容" HorizontalContentAlignment="Left" HorizontalAlignment="Left" VerticalContentAlignment="Center" VerticalAlignment="Top" Width="247" Background="#FFD1D7FF" Margin="10,0,0,0" FontSize="14.667" Height="25" Padding="4,0,0,0"/> </Grid> <!-- 追加情報エリア --> <Grid Grid.Column="1" Margin="10,5,10,0" Height="394" VerticalAlignment="Top"> <!-- ガイダンス(検索タブ) --> <lib:JAFCommonMultiTextBox x:Name="txtblkGuidanceCC" HorizontalAlignment="Center" Margin="0,300,0,0" TextWrapping="Wrap" Width="493" FontFamily="MS Gothic" FontSize="16" BorderBrush="#FFD1D7FF" Foreground="{DynamicResource {x:Static SystemColors.ActiveCaptionTextBrushKey}}" Text="{Binding AddInfoGuidance,Mode=TwoWay }" Height="93" VerticalAlignment="Top"> </lib:JAFCommonMultiTextBox> <lib:JAFCommonLabel Content="追加情報" VerticalContentAlignment="Center" HorizontalContentAlignment="Left" HorizontalAlignment="Center" VerticalAlignment="Top" Width="493" Background="#FFD1D7FF" FontSize="14.667" Height="25" Padding="4,0,0,0"/> <lib:JAFCommonLabel Content="※は、運び可能なサービスカーが手配されます。(例外の支部あり)" VerticalContentAlignment="Center" HorizontalContentAlignment="Left" HorizontalAlignment="Center" VerticalAlignment="Top" Width="493" FontSize="14.667" Height="25" Padding="4,0,0,0" Margin="0,278,0,0"/> <ScrollViewer VerticalScrollBarVisibility="Auto" Margin="0,25,0,121"> <Grid x:Name="addInfoGridCls"> <Grid.ColumnDefinitions> <ColumnDefinition Width="Auto"/> <ColumnDefinition /> </Grid.ColumnDefinitions> </Grid> </ScrollViewer> </Grid> </Grid> </Grid> </Grid> </TabItem> <!-- 検索タブ --> <TabItem Header="検索" x:Name="tbSearch" TabIndex="9" Padding="10,0,10,0" Margin="2,0,2,4" Width="80.68"> <behaviors:Interaction.Triggers> <!-- TODO Click 不触发 --> <behaviors:EventTrigger EventName="PreviewMouseLeftButtonDown"> <behaviors:CallMethodAction MethodName="TabItemSearchClick" TargetObject="{Binding }" /> </behaviors:EventTrigger> </behaviors:Interaction.Triggers> <Grid> <!-- メインコンテンツエリア --> <Grid Grid.Row="1" Margin="0,0,0,30"> <Grid.RowDefinitions> <RowDefinition Height="92*"/> <RowDefinition Height="399*"/> </Grid.RowDefinitions> <!-- 検索タブ内容 --> <Grid Grid.Row="0" Height="121" VerticalAlignment="Top" > <Grid.ColumnDefinitions> <ColumnDefinition Width="479*"/> <ColumnDefinition Width="292*"/> </Grid.ColumnDefinitions> <Grid Grid.ColumnSpan="2"> <!-- キーワード入力 --> <lib:JAFCommonLabel Content="キーワード" HorizontalContentAlignment="Right" HorizontalAlignment="Left" Padding="4" VerticalAlignment="Top" Width="80" FontSize="11pt" Margin="41,8,0,0"/> <lib:JAFCommonTextBox x:Name="txtboxKeyword" TabIndex="10" HorizontalAlignment="Left" Margin="131,10,0,0" VerticalAlignment="Top" MaxLength = "40" Width="518" Height="26" Grid.ColumnSpan="2" Text="{Binding Keyword,Mode=TwoWay, UpdateSourceTrigger=PropertyChanged }"> </lib:JAFCommonTextBox> <!-- 検索ボタン --> <lib:JAFCommonButton x:Name="btnSearch" IsEnabled = "True" Content="検索" TabIndex="11" Command="{Binding F5Command}" Margin="654,9,0,0" HorizontalAlignment="Left" VerticalAlignment="Top" Width="96" Height="26"/> </Grid> <!-- 検索タブ用依頼区分ボタン群 --> <ItemsControl x:Name="tglbtnIraiClsS" ItemsSource="{Binding SIraiClsBtnList,Mode=TwoWay}" Margin="10,50,10,10" Grid.ColumnSpan="2"> <ItemsControl.ItemsPanel> <ItemsPanelTemplate> <UniformGrid Rows="2" Columns="6"/> </ItemsPanelTemplate> </ItemsControl.ItemsPanel> <ItemsControl.ItemTemplate> <DataTemplate> <lib:JAFCommonToggleButton Content="{Binding IraiClsRyakumei,Mode=TwoWay}" IsChecked="{Binding IsChecked,Mode=TwoWay}" IsEnabled="{Binding IsEnabled,Mode=TwoWay}" Height="36" Width="124" FontSize="16" Margin="1"> <behaviors:Interaction.Triggers> <behaviors:EventTrigger EventName="SelectionChanged"> <behaviors:CallMethodAction MethodName="SearchTabIraiClsSelectionChanged" TargetObject="{Binding }" /> </behaviors:EventTrigger> </behaviors:Interaction.Triggers> </lib:JAFCommonToggleButton> </DataTemplate> </ItemsControl.ItemTemplate> </ItemsControl> <!-- 検索タブ用FAQボタン --> <lib:JAFCommonButton x:Name="btnFAQS" Content="FAQ" IsEnabled="{Binding IsFAQEnabled,Mode=TwoWay}" HorizontalAlignment="Left" TabIndex="12" Margin="157,50,0,0" VerticalAlignment="Top" Height="37" Width="62" Grid.Column="1"> <behaviors:Interaction.Triggers> <behaviors:EventTrigger EventName="Click"> <behaviors:CallMethodAction MethodName="SearchTabFAQClick" TargetObject="{Binding }" /> </behaviors:EventTrigger> </behaviors:Interaction.Triggers> </lib:JAFCommonButton> <!-- TODO加图片 検索タブ用マニュアルボタン --> <lib:JAFCommonButton x:Name="btnManualS" IsEnabled="{Binding IsManualEnabled,Mode=TwoWay}" HorizontalAlignment="Left" TabIndex="12" Margin="219,50,0,0" VerticalAlignment="Top" Height="37" Width="62" Grid.Column="1"> <behaviors:Interaction.Triggers> <behaviors:EventTrigger EventName="Click"> <behaviors:CallMethodAction MethodName="SearchTabManualClick" TargetObject="{Binding }" /> </behaviors:EventTrigger> </behaviors:Interaction.Triggers> <StackPanel Width="52"> <lib:JAFCommonTextBlock Height="36" Width="36"/> </StackPanel> </lib:JAFCommonButton> </Grid> <!-- 下部コンテンツエリア-検索タブ --> <Grid Height="399" VerticalAlignment="Center" Grid.Row="1"> <Grid.ColumnDefinitions> <ColumnDefinition Width="3*"/> <ColumnDefinition Width="6*"/> </Grid.ColumnDefinitions> <!-- 依頼内容(検索タブ) --> <Grid Grid.Column="0" Margin="0,5,513,0" Grid.ColumnSpan="2" Height="394" VerticalAlignment="Top"> <lib:JAFCommonListBox x:Name="lstboxIraiContS" TabIndex="14" ItemsSource="{Binding SIraiContList,Mode=TwoWay}" DisplayMemberPath= "IraiCont" SelectedIndex="{Binding SContIndex,Mode=TwoWay}" Margin="10,30,0,0" Height="364" Width="246"> <behaviors:Interaction.Triggers> <behaviors:EventTrigger EventName="SelectionChanged"> <behaviors:CallMethodAction MethodName="SearchTabIraiContSelectionChanged" TargetObject="{Binding }" /> </behaviors:EventTrigger> </behaviors:Interaction.Triggers> </lib:JAFCommonListBox> <lib:JAFCommonLabel Content="依頼内容" HorizontalContentAlignment="Left" HorizontalAlignment="Left" VerticalContentAlignment="Center" VerticalAlignment="Top" Width="247" Background="#FFD1D7FF" Margin="10,0,0,0" FontSize="14.667" Height="25" Padding="4,0,0,0"/> </Grid> <!-- 追加情報エリア --> <Grid Grid.Column="1" Margin="10,5,10,0" Height="394" VerticalAlignment="Top"> <!-- ガイダンス(検索タブ) --> <lib:JAFCommonMultiTextBox x:Name="txtblkGuidanceS" HorizontalAlignment="Center" Margin="0,300,0,0" TextWrapping="Wrap" Width="493" FontFamily="MS Gothic" FontSize="16" BorderBrush="#FFD1D7FF" Foreground="{DynamicResource {x:Static SystemColors.ActiveCaptionTextBrushKey}}" Text="{Binding SAddInfoGuidance,Mode=TwoWay}" Height="93" VerticalAlignment="Top" > </lib:JAFCommonMultiTextBox> <lib:JAFCommonLabel Content="追加情報" VerticalContentAlignment="Center" HorizontalContentAlignment="Left" HorizontalAlignment="Center" VerticalAlignment="Top" Width="493" Background="#FFD1D7FF" FontSize="14.667" Height="25" Padding="4,0,0,0"/> <lib:JAFCommonLabel Content="※は、運び可能なサービスカーが手配されます。(例外の支部あり)" VerticalContentAlignment="Center" HorizontalContentAlignment="Left" HorizontalAlignment="Center" VerticalAlignment="Top" Width="493" FontSize="14.667" Height="25" Padding="4,0,0,0" Margin="0,278,0,0"/> <!-- 追加情報入力エリア(テキストボックス、チェックボックス、ラジオボタン) TODO 这段动态实现Grid从Create <lib:JAFCommonTextBox x:Name="txtboxAddInfoS" TabIndex="15" Margin="0,30,20,250" /> <lib:JAFCommonCheckBox x:Name="chkboxAddInfoS" TabIndex="16" Margin="0,118,0,0" VerticalAlignment="Top"/> <lib:JAFCommonRadioButton x:Name="rdobtnAddInfoS" TabIndex="17" Margin="0,155,20,125" IsEnabled="{Binding IsSelectEnabled}" />--> <ScrollViewer VerticalScrollBarVisibility="Auto" Margin="0,25,0,121"> <Grid x:Name="addInfoGridSearch"> <Grid.ColumnDefinitions> <ColumnDefinition Width="Auto"/> <ColumnDefinition /> </Grid.ColumnDefinitions> </Grid> </ScrollViewer> </Grid> </Grid> </Grid> </Grid> </TabItem> </lib:JAFCommonTabControl> </Border> </Grid> </Grid> </Window>
最新发布
09-27
<think>好的,用户遇到了一个WPF的绑定错误,错误信息指出在类型为IraiClsBtnModel的对象上找不到Background属性。我需要仔细分析他的代码,找出问题所在。 首先,用户提供的XAML中有一个ItemsControl,里面使用了JAFCommonToggleButton,并且绑定了一些属性。错误提示是Background属性找不到,但用户提供的XAML中并没有显式绑定Background属性。这可能是因为在JAFCommonToggleButton的样式或模板中隐式引用了Background,而数据模型IraiClsBtnModel没有这个属性。 接下来,我需要检查用户的数据模型。用户提到IraiClsBtnModel可能包含isChecked、isEnabled和iraiClsRyakumei等属性,但没有提到Background。如果ToggleButton的样式中使用了Background绑定,而数据模型中没有这个属性,就会导致绑定错误。 查看用户提供的XAML,ItemsControl的ItemTemplate中的ToggleButton确实没有显式的Background绑定,但可能在自定义控件JAFCommonToggleButton的默认模板中存在Background的绑定,或者在资源字典中定义的样式里引用了Background。因此,错误可能来源于控件模板中的绑定表达式。 解决方案包括:1. 在IraiClsBtnModel中添加Background属性,并实现INotifyPropertyChanged以通知更新。2. 如果不需要动态绑定Background,检查样式中的绑定是否可以改为静态资源或移除。3. 使用依赖属性或触发器来处理背景颜色变化,而不是直接绑定到数据模型。 另外,用户可能没有意识到自定义控件的样式可能引入了额外的绑定需求。需要确认JAFCommonToggleButton的样式是否正确,或者是否在Generic.xaml中定义了Background的绑定,导致数据模型缺少相应属性。 最后,建议用户检查数据模型和控件样式,确保所有绑定路径的属性都存在,并且正确实现了属性变更通知。如果Background不需要绑定,可能需要调整样式以避免错误。</think>在 WPF 中,**绑定错误 `在类型为 IraiClsBtnModel 的对象上找不到 Background 属性`** 表明某个 UI 元素(如 `ToggleButton`)尝试绑定到 `IraiClsBtnModel.Background`,但该属性在你的数据模型中不存在。 --- ### **根本原因** 1. **绑定路径错误** - 你的 `ToggleButton` 或其样式中存在对 `Background` 的绑定,例如: ```xml <ToggleButton Background="{Binding Background}" /> ``` 但你的数据模型 `IraiClsBtnModel` 中没有 `Background` 属性。 2. **样式或模板中隐式绑定** - 如果 `JAFCommonToggleButton` 是自定义控件,可能在它的默认样式(`Generic.xaml`)中使用了 `Background` 绑定,例如: ```xml <Style TargetType="ToggleButton"> <Setter Property="Background" Value="{Binding Background}" /> </Style> ``` 3. **动态资源或触发器引用** - 某些触发器(`Trigger`)或数据模板可能动态修改 `Background`,但未正确处理绑定上下文。 --- ### **解决方案** #### **1. 确认绑定路径** 检查 XAML 中是否有显式或隐式绑定 `Background`: - **显式绑定**:直接查找 `Background="{Binding Background}"`。 - **隐式绑定**:检查 `JAFCommonToggleButton` 的样式或模板。 #### **2. 在数据模型中添加 `Background` 属性** 如果需要动态绑定背景色,需在 `IraiClsBtnModel` 中添加 `Background` 属性并实现 `INotifyPropertyChanged`: ```csharp public class IraiClsBtnModel : INotifyPropertyChanged { private Brush _background; public Brush Background { get { return _background; } set { _background = value; OnPropertyChanged(nameof(Background)); } } // 其他属性(isChecked, isEnabled, iraiClsRyakumei)... public event PropertyChangedEventHandler PropertyChanged; protected void OnPropertyChanged(string propertyName) { PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName)); } } ``` #### **3. 修改样式或模板** 如果不需要绑定 `Background`,检查 `JAFCommonToggleButton` 的样式并移除或修正绑定: ```xml <!-- 示例:修改样式以避免绑定 --> <Style TargetType="ToggleButton"> <Setter Property="Background" Value="#DDDDDD" /> <!-- 静态颜色 --> <!-- 或动态资源 --> <Setter Property="Background" Value="{DynamicResource MyCustomBrush}" /> </Style> ``` #### **4. 使用触发器动态设置背景** 如果需要根据 `IsChecked` 或其他属性动态修改背景,使用 `Trigger` 而非绑定: ```xml <ToggleButton> <ToggleButton.Style> <Style TargetType="ToggleButton"> <Setter Property="Background" Value="LightGray" /> <Style.Triggers> <Trigger Property="IsChecked" Value="True"> <Setter Property="Background" Value="Blue" /> </Trigger> </Style.Triggers> </Style> </ToggleButton.Style> </ToggleButton> ``` #### **5. 调试绑定错误** 启用 WPF 的绑定调试日志: 1. 在 Visual Studio 中打开 **输出窗口**(Output)。 2. 查看绑定错误的详细信息,例如: ``` System.Windows.Data Error: 40 : BindingExpression path error: 'Background' property not found on 'object' ''IraiClsBtnModel' (HashCode=123456)'. ``` --- ### **关键修复步骤** 1. **检查 `JAFCommonToggleButton` 的样式** - 打开 `Generic.xaml` 或相关资源字典,查找 `Background` 的绑定。 2. **确认数据模型属性** - 确保 `IraiClsBtnModel` 包含所有绑定路径中的属性(如 `Background`)。 3. **使用 `FallbackValue` 避免崩溃** 如果绑定错误无法立即修复,可添加 `FallbackValue` 防止崩溃: ```xml Background="{Binding Background, FallbackValue=LightGray}" ``` --- ### **示例修复代码** 假设你需要根据 `IsChecked` 动态改变背景: #### **ViewModel 中的 `Background` 逻辑** ```csharp public class IraiClsBtnModel : INotifyPropertyChanged { private bool _isChecked; public bool IsChecked { get { return _isChecked; } set { _isChecked = value; OnPropertyChanged(nameof(IsChecked)); OnPropertyChanged(nameof(Background)); // 通知 Background 更新 } } public Brush Background { get { return IsChecked ? Brushes.Blue : Brushes.LightGray; } } public event PropertyChangedEventHandler PropertyChanged; protected void OnPropertyChanged(string propertyName) { PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName)); } } ``` #### **XAML 中绑定 `Background`** ```xml <lib:JAFCommonToggleButton IsChecked="{Binding IsChecked}" Background="{Binding Background}" /> ``` --- ### **相关问题** 1. 如何调试 WPF 中的数据绑定错误? 2. 如何在自定义控件中避免绑定路径错误? 3. `FallbackValue` 和 `TargetNullValue` 在绑定中的作用是什么? 4. 如何通过 `INotifyPropertyChanged` 实现动态属性更新? 5. 触发器(`Trigger`)和数据绑定在样式中的优先级如何?
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