Wpf Xaml VS designer错误:';{dependencProperty.UnsetValue}';
我正在使用模板绑定构建一个自定义选项卡项。一切都很好,直到我在边距上使用了到自定义值转换器的绑定,然后我在VS设计器中得到一个错误: “{DependencyProperty.UnsetValue}”不是Setter上“System.Windows.Controls.Control.Template”属性的有效值 转换器如下所示:Wpf Xaml VS designer错误:';{dependencProperty.UnsetValue}';,wpf,xaml,Wpf,Xaml,我正在使用模板绑定构建一个自定义选项卡项。一切都很好,直到我在边距上使用了到自定义值转换器的绑定,然后我在VS设计器中得到一个错误: “{DependencyProperty.UnsetValue}”不是Setter上“System.Windows.Controls.Control.Template”属性的有效值 转换器如下所示: public class ContentToMarginConverter : IValueConverter { #region IValueConvert
public class ContentToMarginConverter : IValueConverter
{
#region IValueConverter Members
public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
{
return new Thickness(0, 0, -((ContentPresenter)value).ActualHeight, 0);
}
public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
{
throw new NotImplementedException();
}
#endregion
}
public class ContentToPathConverter : IValueConverter
{
#region IValueConverter Members
public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
{
var ps = new PathSegmentCollection(4);
ContentPresenter cp = (ContentPresenter)value;
double h = cp.ActualHeight > 10 ? 1.4 * cp.ActualHeight : 10;
double w = cp.ActualWidth > 10 ? 1.25 * cp.ActualWidth : 10;
ps.Add(new LineSegment(new Point(1, 0.7 * h), true));
ps.Add(new BezierSegment(new Point(1, 0.9 * h), new Point(0.1 * h, h), new Point(0.3 * h, h), true));
ps.Add(new LineSegment(new Point(w, h), true));
ps.Add(new BezierSegment(new Point(w + 0.6 * h, h), new Point(w + h, 0), new Point(w + h * 1.3, 0), true));
return ps;
}
public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
{
throw new NotImplementedException();
}
#endregion
}
<Style TargetType="TabItem">
<Setter Property="SnapsToDevicePixels" Value="True"/>
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="TabItem">
<Grid Name="grd">
<Path Name="tabPath"
StrokeThickness="1"
Stroke="{StaticResource ResourceKey=borderBrush}"
Fill="{StaticResource ResourceKey=unselectedBrush}"
Margin="{Binding ElementName=TabItemContent,Converter={StaticResource ResourceKey=content2Margin}}">
<Path.Data>
<PathGeometry>
<PathFigure IsClosed="False" StartPoint="1,0"
Segments="{Binding ElementName=TabItemContent,Converter={StaticResource ResourceKey=content2Path}}">
</PathFigure>
</PathGeometry>
</Path.Data>
<Path.LayoutTransform>
<ScaleTransform ScaleY="-1"/>
</Path.LayoutTransform>
</Path>
<Rectangle Name="TabItemTopBorder" Height="2" Visibility="Visible"
VerticalAlignment="Bottom"
Margin="{Binding ElementName=TabItemContent, Converter={StaticResource ResourceKey=content2Margin}}" />
<ContentPresenter Name="TabItemContent" ContentSource="Header"
Margin="10,2,10,2" VerticalAlignment="Center"
TextElement.Foreground="White"/>
</Grid>
<ControlTemplate.Triggers>
<Trigger Property="IsMouseOver" Value="True" SourceName="grd">
<Setter Property="Stroke" Value="{StaticResource HoverBrush}" TargetName="tabPath"/>
</Trigger>
<Trigger Property="Selector.IsSelected" Value="True">
<Setter Property="Fill" TargetName="tabPath" Value="{StaticResource ResourceKey=backgroundBrush}"/>
<Setter Property="Panel.ZIndex" Value="2"/>
<Setter Property="Visibility" Value="Hidden" TargetName="TabItemTopBorder"/>
<Setter Property="TextElement.Foreground" TargetName="TabItemContent" Value="Black"/>
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
以及xaml模板,如下所示:
public class ContentToMarginConverter : IValueConverter
{
#region IValueConverter Members
public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
{
return new Thickness(0, 0, -((ContentPresenter)value).ActualHeight, 0);
}
public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
{
throw new NotImplementedException();
}
#endregion
}
public class ContentToPathConverter : IValueConverter
{
#region IValueConverter Members
public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
{
var ps = new PathSegmentCollection(4);
ContentPresenter cp = (ContentPresenter)value;
double h = cp.ActualHeight > 10 ? 1.4 * cp.ActualHeight : 10;
double w = cp.ActualWidth > 10 ? 1.25 * cp.ActualWidth : 10;
ps.Add(new LineSegment(new Point(1, 0.7 * h), true));
ps.Add(new BezierSegment(new Point(1, 0.9 * h), new Point(0.1 * h, h), new Point(0.3 * h, h), true));
ps.Add(new LineSegment(new Point(w, h), true));
ps.Add(new BezierSegment(new Point(w + 0.6 * h, h), new Point(w + h, 0), new Point(w + h * 1.3, 0), true));
return ps;
}
public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
{
throw new NotImplementedException();
}
#endregion
}
<Style TargetType="TabItem">
<Setter Property="SnapsToDevicePixels" Value="True"/>
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="TabItem">
<Grid Name="grd">
<Path Name="tabPath"
StrokeThickness="1"
Stroke="{StaticResource ResourceKey=borderBrush}"
Fill="{StaticResource ResourceKey=unselectedBrush}"
Margin="{Binding ElementName=TabItemContent,Converter={StaticResource ResourceKey=content2Margin}}">
<Path.Data>
<PathGeometry>
<PathFigure IsClosed="False" StartPoint="1,0"
Segments="{Binding ElementName=TabItemContent,Converter={StaticResource ResourceKey=content2Path}}">
</PathFigure>
</PathGeometry>
</Path.Data>
<Path.LayoutTransform>
<ScaleTransform ScaleY="-1"/>
</Path.LayoutTransform>
</Path>
<Rectangle Name="TabItemTopBorder" Height="2" Visibility="Visible"
VerticalAlignment="Bottom"
Margin="{Binding ElementName=TabItemContent, Converter={StaticResource ResourceKey=content2Margin}}" />
<ContentPresenter Name="TabItemContent" ContentSource="Header"
Margin="10,2,10,2" VerticalAlignment="Center"
TextElement.Foreground="White"/>
</Grid>
<ControlTemplate.Triggers>
<Trigger Property="IsMouseOver" Value="True" SourceName="grd">
<Setter Property="Stroke" Value="{StaticResource HoverBrush}" TargetName="tabPath"/>
</Trigger>
<Trigger Property="Selector.IsSelected" Value="True">
<Setter Property="Fill" TargetName="tabPath" Value="{StaticResource ResourceKey=backgroundBrush}"/>
<Setter Property="Panel.ZIndex" Value="2"/>
<Setter Property="Visibility" Value="Hidden" TargetName="TabItemTopBorder"/>
<Setter Property="TextElement.Foreground" TargetName="TabItemContent" Value="Black"/>
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
我在设计器中出现此错误的任何原因,但当我构建项目时,一切正常???设计器基本上会对在设计视图中显示内容所需的内容进行预编译 这可能会引起一些问题 如果重建解决方案不起作用,下一个最好的方法是检测设计器模式并绕过转换器。基本上具有if(isdesignmode)返回;在Convert方法的顶部
有关如何在此处执行此操作的更多信息设计师基本上会对在设计视图中显示内容所需的内容进行预编译 这可能会引起一些问题 如果重建解决方案不起作用,下一个最好的方法是检测设计器模式并绕过转换器。基本上具有if(isdesignmode)返回;在Convert方法的顶部
有关如何执行此操作的更多信息,请参见此处我遇到了类似的错误。我的问题是因为我在样式定义中同时使用了x:Key=“keyName”和x:Name=“keyName”进行了定义。通过删除“x:Name='keyName'”,为我解决了这个问题。我也遇到了类似的错误。我的问题是因为我在样式定义中同时使用了x:Key=“keyName”和x:Name=“keyName”进行了定义。通过删除“x:Name='keyName'”,为我解决了这个问题。我也遇到了类似的错误。我的转换器在单独的程序集中定义。 我尝试重建解决方案,重新启动Visual Studio,。。。设计师仍然没有工作。
但是在删除所有文件(包括源文件和输出文件)后,再次获取源文件并生成解决方案,问题得到了解决。我也遇到了类似的错误。我的转换器在单独的程序集中定义。 我尝试重建解决方案,重新启动Visual Studio,。。。设计师仍然没有工作。
但是在删除所有文件(包括源文件和输出文件)后,再次获取源文件并生成解决方案,问题得到了解决。设计器出现问题的情况并不少见,但在运行时也不例外。您的两个自定义iValueConverter都有问题,还是只有其中一个有问题?设计器出现问题并不少见,但在运行时也不例外。您的两个自定义转换器都有问题,还是只是其中一个?