[英]WPF Data binding error on a checkbox within a combobox
Using WPF, I have a checkbox within a combobox and I keep getting a data binding error when trying to bind a command in a checkbox back to my view model.使用 WPF,我在 combobox 中有一个复选框,当尝试将复选框中的命令绑定回我的视图 model 时,我不断收到数据绑定错误。 Here's the error
这是错误
'OnComboMultiSelectCheckedCommand' property not found on 'object' ''String' (HashCode=-66358460)'. BindingExpression:Path=OnComboMultiSelectCheckedCommand;
DataItem='String' (HashCode=-66358460);
target element is 'InvokeCommandAction' (HashCode=61927311);
target property is 'Command' (type 'ICommand')
Here's an excerpt from the XAML这是 XAML 的摘录
<ComboBox Name="comboMultiSelectBox" SelectedItem="{Binding TargetValue, UpdateSourceTrigger=LostFocus}">
<ComboBox.Style>
<Style TargetType="ComboBox">
<Style.Triggers>
<DataTrigger Binding="{Binding TargetPropert}" Value="Weather">
<Setter Property="ItemsSource" Value="{Binding WeatherList}"></Setter>
</DataTrigger>
</Style.Triggers>
</Style>
</ComboBox.Style>
<ComboBox.ItemTemplateSelector>
<customControls:ComboBoxItemTemplateSelector>
<customControls:ComboBoxItemTemplateSelector.ItemTemplate>
<DataTemplate>
<StackPanel Orientation="Horizontal">
<CheckBox Content="{Binding}"/>
<i:Interaction.Triggers>
<i:EventTrigger EventName="Checked">
<i:InvokeCommandAction Command="{Binding OnComboMultiSelectCheckedCommand}"></i:InvokeCommandAction>
</i:EventTrigger>
<i:EventTrigger EventName="Unchecked">
<i:InvokeCommandAction Command="{Binding Path = OnComboMultiSelectUncheckedCommand}"></i:InvokeCommandAction>
</i:EventTrigger>
</i:Interaction.Triggers>
</StackPanel>
</DataTemplate>
</customControls:ComboBoxItemTemplateSelector.ItemTemplate>
<customControls:ComboBoxItemTemplateSelector.SelectedItemTemplate>
<DataTemplate>
<StackPanel Orientation="Horizontal">
<TextBlock Text ="{Binding TextForDisplay}"></TextBlock>
</StackPanel>
</DataTemplate>
</customControls:ComboBoxItemTemplateSelector.SelectedItemTemplate>
</customControls:ComboBoxItemTemplateSelector>
</ComboBox.ItemTemplateSelector>
</ComboBox>
I have used a Template selection technique as described in #1012 ( https://wpf.2000things.com/?s=combobox ).我使用了 #1012 ( https://wpf.2000things.com/?s=combobox ) 中描述的模板选择技术。
The itemsource for the combo box (WeatherList) is just a list of strings and the binding for the combobox is definitely working.组合框 (WeatherList) 的 itemsource 只是一个字符串列表,并且 combobox 的绑定肯定有效。 The problem is that the checkbox is not picking up the commands I have defined in the viewmodel and I get the binding error as described above.
问题是该复选框没有选择我在视图模型中定义的命令,并且如上所述出现绑定错误。
Thanks谢谢
Several tips and suggestions here:这里有几个提示和建议:
<CheckBox Content="{Binding}"/>
<i:Interaction.Triggers>
<i:EventTrigger EventName="Checked">
<i:InvokeCommandAction Command="{Binding ElementName=comboMultiSelectBox, Path=OnComboMultiSelectCheckedCommand }" />
</i:EventTrigger>
<i:EventTrigger EventName="Unchecked">
<i:InvokeCommandAction Command="{Binding ElementName=comboMultiSelectBox, Path=OnComboMultiSelectUncheckedCommand }" />
</i:EventTrigger>
</i:Interaction.Triggers>
</CheckBox>
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