C# 如果textblock绑定值为空,则删除行
我只是问了一个类似的问题,但我注意到,对于我的错误,我需要隐藏整行,而不仅仅是文本块。让我解释一下发生了什么。因此,我有一个具有以下结构的列表框:C# 如果textblock绑定值为空,则删除行,c#,wpf,xaml,C#,Wpf,Xaml,我只是问了一个类似的问题,但我注意到,对于我的错误,我需要隐藏整行,而不仅仅是文本块。让我解释一下发生了什么。因此,我有一个具有以下结构的列表框: <ListBox VerticalAlignment="Stretch" ItemsSource="{Binding EventInfo}"> <ListBox.ItemTemplate> <DataTemplate> <Grid> <Gri
<ListBox VerticalAlignment="Stretch"
ItemsSource="{Binding EventInfo}">
<ListBox.ItemTemplate>
<DataTemplate>
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="100"/>
<ColumnDefinition Width="20"/>
</Grid.ColumnDefinitions>
<Grid.RowDefinitions>
<RowDefinition/>
<RowDefinition/>
</Grid.RowDefinitions>
<TextBlock Text="Event:" FontWeight="Bold" Grid.Column="0" Grid.Row="0"/>
<TextBlock Text="{Binding Name}" FontWeight="Bold" Grid.Column="1" Grid.Row="0"/>
<TextBlock Text="Foo:" FontWeight="Bold" Grid.Column="0" Grid.Row="1"/>
<TextBlock Text="{Binding Foo}" FontWeight="Bold" Grid.Column="1" Grid.Row="1"/>
</Grid>
</DataTemplate>
</ListBox.ItemTemplate>
</ListBox>
但这不是一个好的解决方案。事实上,您如何看到我已按行和列组织了每个textblock
,因此我需要隐藏包含具有null值的textblock的行
在我的解决方案中,我只隐藏具有null值的textblock,这是无用的,因为该值已经为空或null
有机会通过xaml管理它吗?我不知道如何在XAML中做到这一点,因为如果我在中间隐藏一行,那么我将得到一个空格,该行包含不带NULL值的文本块。我不知道情况是否清楚
如果有什么不清楚的地方,问问我,我会尽量解释得更好。谢谢。你试过转换器吗?
您可以编写字符串到可见性的转换器,如下所示:
<ListBox.Resources>
<Style TargetType="TextBlock">
<Style.Triggers>
<Trigger Property="Text" Value="">
<Setter Property="Visibility" Value="Collapsed" />
</Trigger>
<Trigger Property="Text" Value="{x:Null}">
<Setter Property="Visibility" Value="Collapsed" />
</Trigger>
</Style.Triggers>
</Style>
</ListBox.Resources>
public class EmptyNotVisibleConverter : MarkupExtension, IValueConverter
{
public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
{
return String.IsNullOrEmpty(value as string) ? Visibility.Collapsed : Visibility.Visible;
}
public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
{
throw new NotImplementedException();
}
public override object ProvideValue(IServiceProvider serviceProvider)
{
if (_converter == null)
_converter = new EmptyNotVisibleConverter();
return _converter;
}
private static EmptyNotVisibleConverter _converter = null;
}
<Grid Visibility={Binding Name, Converter={local:EmptyNotVisibleConverter}}>
并在网格上使用它,如下所示:
<ListBox.Resources>
<Style TargetType="TextBlock">
<Style.Triggers>
<Trigger Property="Text" Value="">
<Setter Property="Visibility" Value="Collapsed" />
</Trigger>
<Trigger Property="Text" Value="{x:Null}">
<Setter Property="Visibility" Value="Collapsed" />
</Trigger>
</Style.Triggers>
</Style>
</ListBox.Resources>
public class EmptyNotVisibleConverter : MarkupExtension, IValueConverter
{
public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
{
return String.IsNullOrEmpty(value as string) ? Visibility.Collapsed : Visibility.Visible;
}
public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
{
throw new NotImplementedException();
}
public override object ProvideValue(IServiceProvider serviceProvider)
{
if (_converter == null)
_converter = new EmptyNotVisibleConverter();
return _converter;
}
private static EmptyNotVisibleConverter _converter = null;
}
<Grid Visibility={Binding Name, Converter={local:EmptyNotVisibleConverter}}>
您尝试过转换器吗?
您可以编写字符串到可见性的转换器,如下所示:
<ListBox.Resources>
<Style TargetType="TextBlock">
<Style.Triggers>
<Trigger Property="Text" Value="">
<Setter Property="Visibility" Value="Collapsed" />
</Trigger>
<Trigger Property="Text" Value="{x:Null}">
<Setter Property="Visibility" Value="Collapsed" />
</Trigger>
</Style.Triggers>
</Style>
</ListBox.Resources>
public class EmptyNotVisibleConverter : MarkupExtension, IValueConverter
{
public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
{
return String.IsNullOrEmpty(value as string) ? Visibility.Collapsed : Visibility.Visible;
}
public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
{
throw new NotImplementedException();
}
public override object ProvideValue(IServiceProvider serviceProvider)
{
if (_converter == null)
_converter = new EmptyNotVisibleConverter();
return _converter;
}
private static EmptyNotVisibleConverter _converter = null;
}
<Grid Visibility={Binding Name, Converter={local:EmptyNotVisibleConverter}}>
并在网格上使用它,如下所示:
<ListBox.Resources>
<Style TargetType="TextBlock">
<Style.Triggers>
<Trigger Property="Text" Value="">
<Setter Property="Visibility" Value="Collapsed" />
</Trigger>
<Trigger Property="Text" Value="{x:Null}">
<Setter Property="Visibility" Value="Collapsed" />
</Trigger>
</Style.Triggers>
</Style>
</ListBox.Resources>
public class EmptyNotVisibleConverter : MarkupExtension, IValueConverter
{
public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
{
return String.IsNullOrEmpty(value as string) ? Visibility.Collapsed : Visibility.Visible;
}
public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
{
throw new NotImplementedException();
}
public override object ProvideValue(IServiceProvider serviceProvider)
{
if (_converter == null)
_converter = new EmptyNotVisibleConverter();
return _converter;
}
private static EmptyNotVisibleConverter _converter = null;
}
<Grid Visibility={Binding Name, Converter={local:EmptyNotVisibleConverter}}>
您可以相应地设置网格行高度 替换
<Grid.RowDefinitions>
<RowDefinition/>
<RowDefinition/>
</Grid.RowDefinitions>
与
您可以相应地设置网格行高度 替换
<Grid.RowDefinitions>
<RowDefinition/>
<RowDefinition/>
</Grid.RowDefinitions>
与
Funk我正在尝试实现您的代码,但我不明白一件事:
应该放在行定义之后
?好的,我现在理解了逻辑,非常有趣,我不知道这种做法。非常感谢这个解决方案:)祝您愉快。Funk我正在尝试实现您的代码,但我不明白一件事:
应该放在行定义之后
?好的,我现在理解了逻辑,非常有趣,我不知道这种做法。真的非常感谢这个解决方案:)祝你有一个愉快的一天。