wpf 运行时错误：未找到 InverseBooleanConverter
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Run-time error: InverseBooleanConverter not found
提问by SNS
I have a problem attempting to follow the advice in: How to bind inverse boolean properties in WPF?
我在尝试遵循以下建议时遇到问题： How to bind inverse boolean properties in WPF?
When I use with ResourceDictionary, it give run-time error. InverseBooleanConverter not found.
当我与 ResourceDictionary 一起使用时，它会出现运行时错误。未找到 InverseBooleanConverter。
XMAL as follows:
XMAL 如下：
<UserControl x:Class="SMTF.MasterDataView"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="clr-namespace:SMTF" mc:Ignorable="d" xmlns:d="http://schemas.microsoft.com/expression/blend/2008" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" d:DesignHeight="466" d:DesignWidth="483">
<UserControl.Resources>
<ResourceDictionary>
<ResourceDictionary.MergedDictionaries>
<ResourceDictionary Source="../AppResource.xaml" />
<ResourceDictionary Source="../DefaultStyle.xaml" />
</ResourceDictionary.MergedDictionaries>
</ResourceDictionary>
</UserControl.Resources>
<Grid>
<StackPanel HorizontalAlignment="Left" Margin="200,12,0,0" Name="stkMain" VerticalAlignment="Top" >
<Grid Margin="4">
<ContentControl Visibility="{Binding IsChecked, ElementName=VisibilityToggle, Converter={StaticResource InverseBooleanConverter}}" >
<Border Grid.Column="2" Style="{StaticResource MainBorderStyle}">
<HeaderedContentControl Content="{Binding Path=WorkspaceView}" ContentTemplate="{StaticResource WorkspacesTemplate}" Header="View" Style="{StaticResource MainHCCStyle}"/>
</Border>
</ContentControl>
</Grid>
<Grid DockPanel.Dock="Bottom" Margin="0,2,4,2">
<TextBlock HorizontalAlignment="Right">
<ToggleButton x:Name="VisibilityToggle" Focusable="False" Style="{StaticResource SMToggle}" Command ="{Binding ShowNew}" >
</ToggleButton>
<!--<ToggleButton x:Name="VisibilityToggle" Background="Transparent" Command ="{Binding ShowNew}" >
<Image Source="/Image/Add.png" Width="24" />
</ToggleButton>-->
</TextBlock>
</Grid>
<Grid Margin="4">
<ContentControl Visibility="{Binding IsChecked, ElementName=VisibilityToggle, Converter={StaticResource BoolToVisibility}}" >
<Border Grid.Column="2" Style="{StaticResource MainBorderStyle}">
<HeaderedContentControl Content="{Binding Path=WorkspaceEdit}" ContentTemplate="{StaticResource WorkspacesTemplate}" Header="Configure" Style="{StaticResource MainHCCStyle}"/>
</Border>
</ContentControl>
</Grid>
</StackPanel>
</Grid>
</UserControl>
I'm using the same code provided in the link. ie:
我正在使用链接中提供的相同代码。IE：
[ValueConversion(typeof(bool), typeof(bool))]
public class InverseBooleanConverter: IValueConverter
{
#region IValueConverter Members
public object Convert(object value, Type targetType, object parameter,
System.Globalization.CultureInfo culture)
{
if (targetType != typeof(bool))
throw new InvalidOperationException("The target must be a boolean");
return !(bool)value;
}
public object ConvertBack(object value, Type targetType, object parameter,
System.Globalization.CultureInfo culture)
{
throw new NotSupportedException();
}
#endregion
}
in the AppResource XML
在 AppResource XML 中
<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:vm="clr-namespace:SMTF">
<vm:InverseBooleanConverter x:Key="InverseBoolToVisibility" />
.....
.....
</ResourceDictionary>
Thanks in advance NS
提前致谢
回答by jv_
An alternative to converters for style related binding is to use Style.Triggers, the following shows a canvas when checkbox IsChecked = false, which would otherwise require an InverseBooleanConverter.
用于样式相关绑定的转换器的替代方法是使用 Style.Triggers，以下显示了复选框 IsChecked = false 时的画布，否则将需要 InverseBooleanConverter。
<Canvas x:Name="Overlay">
<Canvas.Style>
<Style TargetType="Canvas">
<Style.Triggers>
<DataTrigger Binding="{Binding IsChecked, ElementName=MyCheckbox}" Value="True">
<Setter Property="Visibility" Value="Collapsed" />
</DataTrigger>
<DataTrigger Binding="{Binding IsChecked, ElementName=MyCheckbox}" Value="False">
<Setter Property="Visibility" Value="Visible" />
</DataTrigger>
</Style.Triggers>
</Style>
</Canvas.Style>
<Rectangle Canvas.ZIndex="3" Fill="#99333333" Height="25" Stroke="Transparent" Width="293" Canvas.Left="10" Canvas.Top="-25"/>
</Canvas>
回答by Nitin
The key you are using is not correct. You resource key is InverseBoolToVisibility, while you have used InverseBooleanConverter as key.
您使用的密钥不正确。您的资源键是InverseBoolToVisibility，而您已使用 InverseBooleanConverter 作为键。
Change the resource key to refer to correct resource as
更改资源键以将正确的资源引用为
<ContentControl Visibility="{Binding IsChecked, ElementName=VisibilityToggle, Converter={StaticResource InverseBoolToVisibility}}" >
Also your implementation for convereter is wrong. If you want to change the Visibility based on Boolean inverse value update your converter code as:
您对转换器的实现也是错误的。如果您想根据布尔逆值更改可见性，请将转换器代码更新为：
public class InverseBooleanConverter: IValueConverter
{
#region IValueConverter Members
public object Convert(object value, Type targetType, object parameter,
System.Globalization.CultureInfo culture)
{
if (targetType != typeof(Visibility))
throw new InvalidOperationException("The target must be a boolean");
if(!(bool)value)
{
return Visibility.Visible;
}
return Visibility.Collapsed;
}
public object ConvertBack(object value, Type targetType, object parameter,
System.Globalization.CultureInfo culture)
{
throw new NotSupportedException();
}
#endregion
}
