任何人都可以帮我解决这个问题，因为我在博客上读到了如何做到这一点 Walkthrough: Two-way binding inside a XAML User Control 但我现在不知道如何用bool值来做到这一点
public bool IsSelected
{
get { return (bool)GetValue(IsSelectedProperty); }
set { SetValueIsSelected(IsSelectedProperty, value); }
}
private void SetValueIsSelected(DependencyProperty property, object value,
[System.Runtime.CompilerServices.CallerMemberName] bool s = null)
{
SetValue(property, value);
if (PropertyChanged != null)
{
string sender = s.ToString();
PropertyChanged(this, new PropertyChangedEventArgs(sender));
}
}
// Using a DependencyProperty as the backing store for IsSelected. This enables animation, styling, binding, etc...
public static readonly DependencyProperty IsSelectedProperty =
DependencyProperty.Register("IsSelected", typeof(bool), typeof(CustomPolygon), new PropertyMetadata(0));
所以这是错误的@Clemens 在这里了解更多关于我的应用程序的更多信息
在我的MainWindow中，我使用两个ComboBox来填充我的数据并绑定到公共ObservableCollection DataPlannen
我在MainWindow背后的代码：
public partial class MainWindow : Window
{
public MainWindow()
{
InitializeComponent();
}
private ObservableCollection<Plan> dataPlannen;
public ObservableCollection<Plan> DataPlannen
{
get { return dataPlannen; }
set
{
if (value != dataPlannen)
{
dataPlannen = value;
}
}
}
//non relevant code deleted
//get database data for ComboBoxes
private void btnGetPlanData_Click(object sender, RoutedEventArgs e)
{
try
{
this.Cursor = Cursors.Wait;
DataPlannen = new PlanCanvasModel().PlanHotspotsHardwares;
}
catch (Exception ex)
{
MessageBox.Show(ex.ToString();
}
finally
{
this.Cursor = Cursors.Arrow;
}
}
private void cmbHotspot_SelectionChanged(object sender, SelectionChangedEventArgs e)
{
if (cmbHotspot.SelectedIndex != -1)
{
foreach (Hotspot hotspot in cmbHotspot.ItemsSource)
{
if (hotspot == (Hotspot)cmbHotspot.SelectedItem)
{
hotspot.IsSelected = true;
else
{
hotspot.IsSelected = false;
}
}
}
}
My MainWindow XAML：
<Grid Background="LightGray">
<DockPanel Name="TestCanvas" LastChildFill="True">
<Grid x:Name="Sidebar" DockPanel.Dock="Right" Width="200">
<StackPanel Margin="0,10,10,0">
<ScrollViewer Height="112" VerticalScrollBarVisibility="Auto">
<StackPanel>
<StackPanel Orientation="Horizontal" Margin="0,0,0,5">
<Button x:Name="btnGetPlanData" Width="30" Height="30" HorizontalAlignment="Left" Margin="5,0" Click="btnGetPlanData_Click">
<Image Source="Images/database38.png" Stretch="Uniform"></Image>
<Button.ToolTip>Laad plannen in</Button.ToolTip>
</Button>
</StackPanel>
<Grid>
<ComboBox x:Name="cmbPlannen" Width="180"
ItemsSource="{Binding ElementName=myWindow,Path=DataPlannen}"
DisplayMemberPath="{Binding Plan_naam}"
SelectedValuePath="{Binding Plan_Id}"
SelectionChanged="cmbPlannen_SelectionChanged" IsEditable="True">
<ComboBox.ToolTip>
<ToolTip>Zoek op text of selecteer</ToolTip>
</ComboBox.ToolTip>
</ComboBox>
</Grid>
</StackPanel>
</ScrollViewer>
<Grid>
<ComboBox Margin="5" SnapsToDevicePixels="True" ItemsSource="{Binding ElementName=cmbPlannen,Path=SelectedItem.Hotspots,Mode=TwoWay}"
x:Name="cmbHotspot" SelectedIndex="0"
DisplayMemberPath="{Binding Hotspot_naam}"
SelectedValuePath="{Binding Hotspot_Id}"
SelectedItem="{Binding SelectedItem}"
SelectionChanged="cmbHotspot_SelectionChanged" IsEditable="True">
<ComboBox.ItemContainerStyle>
<Style>
<Setter Property="Control.Padding" Value="0"></Setter>
<Style.Triggers>
<Trigger Property="ComboBoxItem.IsSelected" Value="True">
<Setter Property="ComboBoxItem.Background" Value="LightGray" />
</Trigger>
<Trigger Property="ComboBoxItem.IsHighlighted" Value="True">
<Setter Property="ComboBoxItem.Background" Value="White" />
</Trigger>
</Style.Triggers>
</Style>
</ComboBox.ItemContainerStyle>
<ComboBox.ToolTip>
<ToolTip>Zoek op text of selecteer</ToolTip>
</ComboBox.ToolTip>
</ComboBox>
</Grid>
</StackPanel>
</Grid>
<Grid x:Name="MainContainer" ClipToBounds="True"
>
<Viewbox>
<ItemsControl x:Name="drawingsheet" ItemsSource="{Binding ElementName=cmbPlannen, Path=SelectedItem.Hotspots}"
Width="{StaticResource canvasWidth}"
Height="{StaticResource canvasHeight}"
MouseLeftButtonUp="drawingsheet_MouseLeftButtonUp"
MouseRightButtonDown="drawingsheet_MouseRightButtonDown"
MouseWheel="drawingsheet_MouseWheel"
MouseLeftButtonDown="drawingsheet_MouseLeftButtonDown"
MouseMove="drawingsheet_MouseMove"
Background="White"
>
<ItemsControl.ItemsPanel>
<ItemsPanelTemplate>
<Canvas Background="{Binding ElementName=cmbPlannen,Path=SelectedItem.Plan_image,Converter={StaticResource ResourceKey=bytesToBitmapImageConverter}}"
Width="{StaticResource canvasWidth}" Height="{StaticResource canvasHeight}" />
</ItemsPanelTemplate>
</ItemsControl.ItemsPanel>
<ItemsControl.ItemTemplate>
<DataTemplate>
<customPolygon:CustomPolygon x:Name="currentPolygon" PointsPolygon="{Binding Hotspot_points}"
IsSelected="{Binding IsSelected,Mode=TwoWay}"
HasChildren="{Binding HasChildren}"></customPolygon:CustomPolygon>
</DataTemplate>
</ItemsControl.ItemTemplate>
<ItemsControl.ItemContainerStyle>
<Style>
<Setter Property="Canvas.Top" Value="{Binding Path=Y}" />
<Setter Property="Canvas.Left" Value="{Binding Path=X}" />
</Style>
</ItemsControl.ItemContainerStyle>
<ItemsControl.RenderTransform>
<TransformGroup>
<ScaleTransform x:Name="scaleCanvas"></ScaleTransform>
<TranslateTransform x:Name="moveCanvas"></TranslateTransform>
</TransformGroup>
</ItemsControl.RenderTransform>
</ItemsControl>
</Viewbox>
</Grid>
</DockPanel>
</Grid>
我的UserControl CustomPolygon.Xaml：
<UserControl x:Class="testCanvas.Controls.DrawingControls.CustomPolygon"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:i="http://schemas.microsoft.com/expression/2010/interactivity"
mc:Ignorable="d"
Name="userControl"
>
<Polygon x:Name="polygon"
Points="{Binding ElementName=userControl,Path=PointsSource}"
StrokeThickness="0.5"
Stroke="Black"
Opacity="0.5"
MouseEnter="polygon_MouseEnter"
MouseLeave="polygon_MouseLeave"
MouseLeftButtonDown="polygon_MouseLeftButtonDown"/>
</UserControl>
我的代码来自CustomPolygon
public partial class CustomPolygon : UserControl, INotifyPropertyChanged
{
public CustomPolygon()
{
InitializeComponent();
}
#region Properties
public bool IsSelected
{
get { return (bool)GetValue(IsSelectedProperty); }
set
{
SetValue(IsSelectedProperty, value);
if (IsSelected)
{
polygon.Stroke = Brushes.Red;
polygon.StrokeThickness = 2;
}
else
{
polygon.Stroke = Brushes.Black;
polygon.StrokeThickness = 0.5;
}
}
}
// Using a DependencyProperty as the backing store for IsSelected. This enables animation, styling, binding, etc...
public static readonly DependencyProperty IsSelectedProperty =
DependencyProperty.Register("IsSelected", typeof(bool), typeof(CustomPolygon),
new FrameworkPropertyMetadata(false, FrameworkPropertyMetadataOptions.BindsTwoWayByDefault));
//points for polygon
public PointCollection PointsPolygon
{
get { return (PointCollection)GetValue(PointsPolygonProperty); }
set { SetValue(PointsPolygonProperty, value); }
}
// Using a DependencyProperty as the backing store for PointsPolygon. This enables animation, styling, binding, etc...
public static readonly DependencyProperty PointsPolygonProperty =
DependencyProperty.Register("PointsPolygon", typeof(PointCollection), typeof(CustomPolygon),
new FrameworkPropertyMetadata(false, FrameworkPropertyMetadataOptions.BindsTwoWayByDefault));
public bool HasChildren
{
get { return (bool)GetValue(HasChildrenProperty); }
set { SetValue(HasChildrenProperty, value); }
}
// Using a DependencyProperty as the backing store for HasChildren. This enables animation, styling, binding, etc...
public static readonly DependencyProperty HasChildrenProperty =
DependencyProperty.Register("HasChildren", typeof(bool), typeof(CustomPolygon),
new FrameworkPropertyMetadata(false, FrameworkPropertyMetadataOptions.BindsTwoWayByDefault));
#endregion
private void polygon_MouseEnter(object sender, MouseEventArgs e)
{
if (IsSelected != true)
{
polygon.Stroke = new SolidColorBrush((Color)ColorConverter.ConvertFromString(Properties.Settings.Default.HotspotHover));
polygon.StrokeThickness = 1;
}
}
private void polygon_MouseLeave(object sender, MouseEventArgs e)
{
if (IsSelected != true)
{
polygon.Stroke = Brushes.Black;
polygon.StrokeThickness = 0.5;
}
}
private void polygon_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)
{
IsSelected = !IsSelected;
}
public event PropertyChangedEventHandler PropertyChanged;
protected virtual void OnPropertyChanged(string propertyName)
{
if (this.PropertyChanged != null)
this.PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
}
}
现在问题是如果我在cmbHotspot中更改我的选择，我的usercontrol中的属性没有变化，反之亦然
答案 0 :(得分：2)
他们在这篇博客中所说的内容对于WPF来说是不正确的。这篇文章不是关于WPF，它在Windows运行时甚至不需要它。您绝对应该忽略有关在自定义控件的构造函数中设置DataContext的部分。
无论如何，您不能在依赖项属性的CLR包装器的setter中调用除SetValue以外的任何内容。有关详细信息，请参阅MSDN上的XAML Loading and Dependency Properties文章。
除了依赖属性不需要引发PropertyChanged事件之外，所以你的SetValueIsSelected属性无论如何都是多余的。
最后，您的属性元数据错误，因为0不是类型bool的有效默认值。
您的声明应如下所示：
public static readonly DependencyProperty IsSelectedProperty =
DependencyProperty.Register(
"IsSelected", typeof(bool), typeof(CustomPolygon));
public bool IsSelected
{
get { return (bool)GetValue(IsSelectedProperty); }
set { SetValue(IsSelectedProperty, value); }
}
除非您不想设置任何非标准属性元数据，否则无需指定PropertyMetadata方法的Register参数。
但是，如果您希望该属性默认绑定为双向，则必须按属性元数据设置相应的标志。
public static readonly DependencyProperty IsSelectedProperty =
DependencyProperty.Register(
"IsSelected", typeof(bool), typeof(CustomPolygon),
new FrameworkPropertyMetadata(
false, FrameworkPropertyMetadataOptions.BindsTwoWayByDefault);