Я пытаюсь получить всплывающую подсказку для отображения изображения при наведении указателя мыши на строку внутри DataGrid в WPF.
Вот фрагмент кода XAML для RowStyle:
<DataGrid.RowStyle>
<Style TargetType="DataGridRow" >
<Style.Triggers>
<DataTrigger Binding="{Binding Path=CNIsOnline,UpdateSourceTrigger=PropertyChanged}" Value="False">
<Setter Property="Background" Value="{Binding RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type DataGrid}},Path=DataContext.OfflineColor,UpdateSourceTrigger=PropertyChanged}"></Setter>
</DataTrigger>
<DataTrigger Binding="{Binding Path=CNIsOnline,UpdateSourceTrigger=PropertyChanged}" Value="True">
<Setter Property="Background" Value="{Binding RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type DataGrid}},Path=DataContext.OnlineColor,UpdateSourceTrigger=PropertyChanged}"></Setter>
</DataTrigger>
<DataTrigger Binding="{Binding Path=CNIsOnline,UpdateSourceTrigger=PropertyChanged}" Value="{x:Null}">
<Setter Property="Background" Value="{Binding RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type DataGrid}},Path=DataContext.UnknownColor,UpdateSourceTrigger=PropertyChanged}"></Setter>
</DataTrigger>
<Trigger Property="IsMouseOver" Value="True">
<Setter Property="DataContext" Value="{Binding PlacementTarget.DataContext, RelativeSource={RelativeSource Self}}"/>
<Setter Property="ToolTip">
<Setter.Value>
<Image Height="50" Width="50" Source="{Binding userimg}"/>
</Setter.Value>
</Setter>
</Trigger>
</Style.Triggers>
</Style>
</DataGrid.RowStyle>
Я знаю, userimg установлено правильно, потому что, если я возьму эту строку:
<Image Height="50" Width="50" Source="{Binding userimg}"/>
И поместу ее где-нибудь еще в моем XAML, я вижу изображение.Если я изменю userimg (это просто строка на путь PNG) на жестко закодированный путь, он, похоже, будет работать, поэтому я знаю, что это проблема с текстом данных.
Я пробовал несколько вещей, включая: это , это , это и это , но я все еще пытаюсь получить это изображение для отображения с помощью привязки данных.
Я тоже пытался это безуспешно:
<Setter Property="ToolTip">
<Setter.Value>
<Image Height="50" Width="50" Source={Binding RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type DataGrid}},Path=DataContext.userimg,UpdateSourceTrigger=PropertyChanged}"/>
</Setter.Value>
Это ошибки, которые появляются, когда я пытаюсь просмотреть подсказку:
System.Windows.Data Error: 40 : BindingExpression path error: 'userimg' property not found on 'object' ''DataRowView' (HashCode=6587426)'. BindingExpression:Path=userimg; DataItem='DataRowView' (HashCode=6587426); target element is 'Image' (Name=''); target property is 'Source' (type 'ImageSource')
System.Windows.Data Information: 20 : BindingExpression cannot retrieve value due to missing information. BindingExpression:Path=userimg; DataItem='DataRowView' (HashCode=6587426); target element is 'Image' (Name=''); target property is 'Source' (type 'ImageSource')
System.Windows.Data Information: 21 : BindingExpression cannot retrieve value from null data item. This could happen when binding is detached or when binding to a Nullable type that has no value. BindingExpression:Path=userimg; DataItem='DataRowView' (HashCode=6587426); target element is 'Image' (Name=''); target property is 'Source' (type 'ImageSource')
System.Windows.Data Information: 10 : Cannot retrieve value using the binding and no valid fallback value exists; using default instead. BindingExpression:Path=userimg; DataItem='DataRowView' (HashCode=6587426); target element is 'Image' (Name=''); target property is 'Source' (type 'ImageSource')
System.Windows.Data Information: 41 : BindingExpression path error: 'userimg' property not found for 'object' because data item is null. This could happen because the data provider has not produced any data yet. BindingExpression:Path=userimg; DataItem=null; target element is 'Image' (Name=''); target property is 'Source' (type 'ImageSource')
System.Windows.Data Information: 20 : BindingExpression cannot retrieve value due to missing information. BindingExpression:Path=userimg; DataItem=null; target element is 'Image' (Name=''); target property is 'Source' (type 'ImageSource')
System.Windows.Data Information: 21 : BindingExpression cannot retrieve value from null data item. This could happen when binding is detached or when binding to a Nullable type that has no value. BindingExpression:Path=userimg; DataItem=null; target element is 'Image' (Name=''); target property is 'Source' (type 'ImageSource')
System.Windows.Data Information: 10 : Cannot retrieve value using the binding and no valid fallback value exists; using default instead. BindingExpression:Path=userimg; DataItem=null; target element is 'Image' (Name=''); target property is 'Source' (type 'ImageSource')
Может кто-нибудь помочь, не могу больше терять волосы ...
ОБНОВЛЕНИЕ
Спасибо за ответ, Энди, вот мой весь фрагментdatagrid:
<DataGrid Grid.Row="1" Grid.ColumnSpan="187" Name="DG1" Background="Transparent" Foreground="{Binding MyForegroundColor}" BorderThickness="0" HeadersVisibility="Column" CanUserAddRows="False" IsReadOnly="True" Opacity="1" SelectionMode="Single" AutoGenerateColumns="True">
<DataGrid.Resources>
<Style TargetType="ScrollBar">
<Setter Property="Opacity" Value=".3" />
</Style>
<SolidColorBrush x:Key="{x:Static SystemColors.HighlightBrushKey}" Color="{Binding MyAccentColor,Converter={StaticResource ColorToSolidColorBrush_ValueConverter}}"/>
<SolidColorBrush x:Key="{x:Static SystemColors.HighlightTextBrushKey}" Color="{Binding MyForegroundColor,Converter={StaticResource ColorToSolidColorBrush_ValueConverter}}"/>
<SolidColorBrush x:Key="{x:Static SystemColors.InactiveSelectionHighlightBrushKey}" Color="{Binding MyAccentColor,Converter={StaticResource ColorToSolidColorBrush_ValueConverter}}"/>
<SolidColorBrush x:Key="{x:Static SystemColors.InactiveSelectionHighlightTextBrushKey}" Color="{Binding MyForegroundColor,Converter={StaticResource ColorToSolidColorBrush_ValueConverter}}"/>
<Image x:Key="yuserimg" Height="50" Width="50" Source="{Binding userimg}"/>
</DataGrid.Resources>
<DataGrid.ColumnHeaderStyle>
<Style TargetType="{x:Type DataGridColumnHeader}">
<Setter Property="HorizontalContentAlignment" Value="Left" />
<Setter Property="FontWeight" Value="bold"/>
<Setter Property="Margin" Value="0"/>
<Setter Property="Padding" Value="1" />
<Setter Property="Background" Value="Transparent" />
<Setter Property="BorderThickness" Value="1"/>
</Style>
</DataGrid.ColumnHeaderStyle>
<DataGrid.RowStyle>
<Style TargetType="DataGridRow" >
<Setter Property="ToolTip" Value="{Binding yuserimg}"/>
<Style.Triggers>
<DataTrigger Binding="{Binding Path=CNIsOnline,UpdateSourceTrigger=PropertyChanged}" Value="False">
<Setter Property="Background" Value="{Binding RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type DataGrid}},Path=DataContext.OfflineColor,UpdateSourceTrigger=PropertyChanged}"></Setter>
</DataTrigger>
<DataTrigger Binding="{Binding Path=CNIsOnline,UpdateSourceTrigger=PropertyChanged}" Value="True">
<Setter Property="Background" Value="{Binding RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type DataGrid}},Path=DataContext.OnlineColor,UpdateSourceTrigger=PropertyChanged}"></Setter>
</DataTrigger>
<DataTrigger Binding="{Binding Path=CNIsOnline,UpdateSourceTrigger=PropertyChanged}" Value="{x:Null}">
<Setter Property="Background" Value="{Binding RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type DataGrid}},Path=DataContext.UnknownColor,UpdateSourceTrigger=PropertyChanged}"></Setter>
</DataTrigger>
</Style.Triggers>
</Style>
</DataGrid.RowStyle>
</DataGrid>
Однако, когда я нахожу указатель мыши на строке, я больше не вижу всплывающей подсказки.
ОБНОВЛЕНИЕ 2
Я обновил привязку к динамическому ресурсу следующим образом:
<DataGrid.Resources>
<Style TargetType="ScrollBar">
<Setter Property="Opacity" Value=".3" />
</Style>
<SolidColorBrush x:Key="{x:Static SystemColors.HighlightBrushKey}" Color="{Binding MyAccentColor,Converter={StaticResource ColorToSolidColorBrush_ValueConverter}}"/>
<SolidColorBrush x:Key="{x:Static SystemColors.HighlightTextBrushKey}" Color="{Binding MyForegroundColor,Converter={StaticResource ColorToSolidColorBrush_ValueConverter}}"/>
<SolidColorBrush x:Key="{x:Static SystemColors.InactiveSelectionHighlightBrushKey}" Color="{Binding MyAccentColor,Converter={StaticResource ColorToSolidColorBrush_ValueConverter}}"/>
<SolidColorBrush x:Key="{x:Static SystemColors.InactiveSelectionHighlightTextBrushKey}" Color="{Binding MyForegroundColor,Converter={StaticResource ColorToSolidColorBrush_ValueConverter}}"/>
<Image x:Key="yuserimg" Height="50" Width="50" Source="{Binding userimg}"/>
</DataGrid.Resources>
<DataGrid.RowStyle>
<Style TargetType="DataGridRow" >
<Setter Property="ToolTip" Value="{DynamicResource yuserimg}"/>
<Style.Triggers>
<DataTrigger Binding="{Binding Path=CNIsOnline,UpdateSourceTrigger=PropertyChanged}" Value="False">
<Setter Property="Background" Value="{Binding RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type DataGrid}},Path=DataContext.OfflineColor,UpdateSourceTrigger=PropertyChanged}"></Setter>
</DataTrigger>
<DataTrigger Binding="{Binding Path=CNIsOnline,UpdateSourceTrigger=PropertyChanged}" Value="True">
<Setter Property="Background" Value="{Binding RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type DataGrid}},Path=DataContext.OnlineColor,UpdateSourceTrigger=PropertyChanged}"></Setter>
</DataTrigger>
<DataTrigger Binding="{Binding Path=CNIsOnline,UpdateSourceTrigger=PropertyChanged}" Value="{x:Null}">
<Setter Property="Background" Value="{Binding RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type DataGrid}},Path=DataContext.UnknownColor,UpdateSourceTrigger=PropertyChanged}"></Setter>
</DataTrigger>
</Style.Triggers>
</Style>
</DataGrid.RowStyle>
Тем не менее, я все еще получаю ошибки привязки и просто вижу окно 50x50 в качестве всплывающей подсказки.
Вотошибки привязки:
System.Windows.Data Information: 41 : BindingExpression path error: 'userimg' property not found for 'object' because data item is null. This could happen because the data provider has not produced any data yet. BindingExpression:Path=userimg; DataItem=null; target element is 'Image' (Name=''); target property is 'Source' (type 'ImageSource')
System.Windows.Data Information: 20 : BindingExpression cannot retrieve value due to missing information. BindingExpression:Path=userimg; DataItem=null; target element is 'Image' (Name=''); target property is 'Source' (type 'ImageSource')
System.Windows.Data Information: 21 : BindingExpression cannot retrieve value from null data item. This could happen when binding is detached or when binding to a Nullable type that has no value. BindingExpression:Path=userimg; DataItem=null; target element is 'Image' (Name=''); target property is 'Source' (type 'ImageSource')
System.Windows.Data Information: 10 : Cannot retrieve value using the binding and no valid fallback value exists; using default instead. BindingExpression:Path=userimg; DataItem=null; target element is 'Image' (Name=''); target property is 'Source' (type 'ImageSource')