尝试创建一个 DataTemplate
样式,它应该根据 bool 值“IsReported”更改几个渐变停止点的颜色。这是一个 MVVM 项目。
但是,当我将项目添加到列表框绑定(bind)到的 ObservableCollection(在 View 模型中)时,出现此错误:
{"'在'System.Windows.Markup.StaticResourceHolder' 上提供值引发异常。'行号“153”和行位置“38”。”
找不到名为“timeSlotColorValue”的资源。资源名称区分大小写。
这是样式/数据模板:
<LinearGradientBrush x:Key="bordBackground" EndPoint="1,1" StartPoint="0,0">
<GradientStop x:Name="timeSlotColorValue" Color="Lime" Offset="0" />
<GradientStop Color="Transparent" Offset="0.2"/>
<GradientStop Color="Transparent" Offset="0.8"/>
<GradientStop x:Name="timeSlotColorValue2" Color="Lime" Offset="1"/>
</LinearGradientBrush>
<Style TargetType="ListBox" x:Key="timeSlotTemplate">
<Setter Property="ItemTemplate">
<Setter.Value>
<DataTemplate DataType="model:DVRTimeSlot">
<DataTemplate.Triggers>
<DataTrigger Binding="{Binding IsReported}" Value="true">
<Setter Property="GradientStop.Color" TargetName="{StaticResource timeSlotColorValue}" Value="Red" />
<Setter Property="GradientStop.Color" TargetName="{StaticResource timeSlotColorValue2}" Value="Red" />
</DataTrigger>
</DataTemplate.Triggers>
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="50" />
<ColumnDefinition />
</Grid.ColumnDefinitions>
<TextBlock Text="{Binding TimeString}" Padding="2" FontSize="13" FontWeight="Black" >
<TextBlock.Background>
<LinearGradientBrush EndPoint="0.5,1" MappingMode="RelativeToBoundingBox" StartPoint="0,1">
<GradientStop Color="LightGray" Offset="0"/>
<GradientStop Color="Azure" Offset="1"/>
</LinearGradientBrush>
</TextBlock.Background>
</TextBlock>
<Border Grid.Column="1" Background="{StaticResource bordBackground}">
<Border.Resources>
<Style TargetType="TextBlock">
<Setter Property="TextAlignment" Value="Right" />
<Setter Property="Padding" Value="5,0"/>
<Setter Property="FontSize" Value="13"/>
<Setter Property="FontWeight" Value="SemiBold" />
</Style>
<Style TargetType="Border">
<Setter Property="Padding" Value="3" />
<Setter Property="Margin" Value="-3,0,-3,0" />
<Setter Property="MinWidth" Value="240"/>
</Style>
</Border.Resources>
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition />
<ColumnDefinition />
</Grid.ColumnDefinitions>
<TextBlock Grid.Column="0" Text="{Binding Reason}" TextAlignment="Center"/>
</Grid>
</Border>
</Grid>
</DataTemplate>
</Setter.Value>
</Setter>
</Style>
这是我的数据基于的模型:
public class DVRTimeSlot
{
public DVRTimeSlot()
{
}
public bool IsReported { get; set; }
public string Reason { get; set; }
public CallReportCategory Category { get; set; }
public DateTime TimeValue { get; set; }
public string TimeString
{
get { return TimeValue.Hour + ":" + TimeValue.Minute; }
}
}
任何人都可以阐明这一点,我是否走错了路? 我将这篇文章用作指南:Change color of textbox with trigger , 但在这种情况下似乎不起作用
最佳答案
StaticResource
扩展将查找具有您指定为参数的 x:Key
的资源。在您发布的代码中,您只指定了一个 x:Name
关于c# - 数据绑定(bind)到渐变停止时找不到可视化树元素,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/17076216/