WPF - IsEnabled绑定到DependencyProperty无法正常工作-Java 学习之路

我在我的窗口中定义了依赖属性，如下所示：

public static readonly DependencyProperty IsGenericUserProperty = DependencyProperty.Register("IsGenericUser", typeof (bool), typeof (MainWindow));
public bool IsGenericUser
{
    get { return (bool) GetValue(IsGenericUserProperty); }
    set { SetValue(IsGenericUserProperty, value); }
}

在我的窗口的构造函数中，我设置了包含按钮的容器的数据上下文：

QuickListButtonsStackPanel.DataContext = this;

我将依赖属性绑定到按钮的IsEnabled属性：

<Button IsEnabled="{Binding IsGenericUser}" .../>

在启动IsGenericUser时为true，因此启用了按钮 . 当我将IsGenericUser设置为false时，该按钮被禁用 . 但是，如果我再次使IsGenericUser为true，则按钮没有任何反应，它仍然被禁用 . 我究竟做错了什么？

谢谢！

编辑：这是我使用按钮的样式 . 此样式导致问题（如果按钮没有自定义样式，它可以正常工作）：

<Style x:Key="BlackButtonStyle" TargetType="{x:Type Button}">
    <Setter Property="Template">
        <Setter.Value>
            <ControlTemplate TargetType="{x:Type Button}">
                <ControlTemplate.Resources>
                    <Storyboard x:Key="MouseOverActivating">
                        <ColorAnimationUsingKeyFrames BeginTime="00:00:00" Storyboard.TargetName="rectangle" Storyboard.TargetProperty="(Shape.Fill).(GradientBrush.GradientStops)[1].(GradientStop.Color)">
                            <SplineColorKeyFrame KeyTime="00:00:00" Value="#FF2F2F2F"/>
                            <SplineColorKeyFrame KeyTime="00:00:00.1270000" Value="#FF2391FF"/>
                        </ColorAnimationUsingKeyFrames>
                    </Storyboard>
                    <Storyboard x:Key="MouseOverDeactivating">
                        <ColorAnimationUsingKeyFrames BeginTime="00:00:00" Storyboard.TargetProperty="(Shape.Fill).(GradientBrush.GradientStops)[1].(GradientStop.Color)" Storyboard.TargetName="rectangle">
                            <SplineColorKeyFrame KeyTime="00:00:00" Value="#FF2391FF"/>
                            <SplineColorKeyFrame KeyTime="00:00:00.2200000" Value="#FF2F2F2F"/>

                        </ColorAnimationUsingKeyFrames>
                    </Storyboard>
                    <Storyboard x:Key="PressActivating">
                        <ColorAnimationUsingKeyFrames BeginTime="00:00:00" Storyboard.TargetName="rectangle" Storyboard.TargetProperty="(Shape.Fill).(GradientBrush.GradientStops)[1].(GradientStop.Color)">
                            <SplineColorKeyFrame KeyTime="00:00:00" Value="#FF2391FF"/>
                            <SplineColorKeyFrame KeyTime="00:00:00.1370000" Value="#FF48D6FF"/>
                        </ColorAnimationUsingKeyFrames>
                    </Storyboard>
                    <Storyboard x:Key="PressedDeactivating" FillBehavior="Stop" >
                        <ColorAnimationUsingKeyFrames BeginTime="00:00:00" Storyboard.TargetProperty="(Shape.Fill).(GradientBrush.GradientStops)[1].(GradientStop.Color)" Storyboard.TargetName="rectangle">
                            <SplineColorKeyFrame KeyTime="00:00:00" Value="#FF48D6FF"/>
                            <SplineColorKeyFrame KeyTime="00:00:00.2370000" Value="#FF2391FF"/>
                        </ColorAnimationUsingKeyFrames>
                    </Storyboard>
                    <Storyboard x:Key="DisableActivating">
                        <ColorAnimationUsingKeyFrames BeginTime="00:00:00" Duration="00:00:00.0010000" Storyboard.TargetName="rectangle" Storyboard.TargetProperty="(Shape.Fill).(GradientBrush.GradientStops)[1].(GradientStop.Color)">
                            <SplineColorKeyFrame KeyTime="00:00:00" Value="#FFA7A7A7"/>
                        </ColorAnimationUsingKeyFrames>
                    </Storyboard>
                </ControlTemplate.Resources>
                <Grid>
                    <Rectangle Stroke="Transparent" RadiusX="5" RadiusY="5" x:Name="rectangle">
                        <Rectangle.Fill>
                            <LinearGradientBrush EndPoint="0.5,1" StartPoint="0.5,0">
                                <GradientStop Color="#FF000000" Offset="0"/>
                                <GradientStop Color="#FF2F2F2F" Offset="1"/>
                            </LinearGradientBrush>
                        </Rectangle.Fill>
                    </Rectangle>
                    <ContentPresenter HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}" VerticalAlignment="{TemplateBinding VerticalContentAlignment}" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}" RecognizesAccessKey="True" OpacityMask="{x:Null}"/>
                    <Rectangle Stroke="Transparent" RadiusX="5" RadiusY="5" x:Name="WhiteGlow">
                        <Rectangle.Fill>
                            <LinearGradientBrush EndPoint="0.5,1" StartPoint="0.5,0">
                                <GradientStop Color="#5BFFFFFF" Offset="0"/>
                                <GradientStop Color="#00FFFFFF" Offset="0.5"/>
                            </LinearGradientBrush>
                        </Rectangle.Fill>
                    </Rectangle>
                </Grid>
                <ControlTemplate.Triggers>
                    <Trigger Property="IsCancel" Value="False"/>
                    <EventTrigger RoutedEvent="FrameworkElement.Loaded"/>
                    <Trigger Property="IsFocused" Value="True">
                        <Trigger.ExitActions>
                            <BeginStoryboard Storyboard="{StaticResource MouseOverActivating}" x:Name="MouseOverActivating_BeginStoryboard2"/>
                        </Trigger.ExitActions>
                        <Trigger.EnterActions>
                            <BeginStoryboard Storyboard="{StaticResource MouseOverActivating}" x:Name="MouseOverActivating_BeginStoryboard1"/>
                        </Trigger.EnterActions>
                    </Trigger>
                    <Trigger Property="IsDefaulted" Value="True"/>
                    <Trigger Property="IsMouseOver" Value="True">
                        <Trigger.ExitActions>
                            <BeginStoryboard Storyboard="{StaticResource MouseOverDeactivating}" x:Name="MouseOverDeactivating_BeginStoryboard"/>
                        </Trigger.ExitActions>
                        <Trigger.EnterActions>
                            <BeginStoryboard Storyboard="{StaticResource MouseOverActivating}" x:Name="MouseOverActivating_BeginStoryboard"/>
                        </Trigger.EnterActions>
                    </Trigger>
                    <Trigger Property="IsPressed" Value="True">
                        <Trigger.EnterActions>
                            <BeginStoryboard x:Name="PressActivating_BeginStoryboard" Storyboard="{StaticResource PressActivating}"/>
                        </Trigger.EnterActions>
                        <Trigger.ExitActions>
                            <BeginStoryboard x:Name="PressedDeactivating_BeginStoryboard" Storyboard="{StaticResource PressedDeactivating}"/>
                        </Trigger.ExitActions>
                    </Trigger>
                    <Trigger Property="IsEnabled" Value="False">
                        <Trigger.EnterActions>
                            <BeginStoryboard Storyboard="{StaticResource DisableActivating}" x:Name="DisableActivating_BeginStoryboard"/>
                        </Trigger.EnterActions>
                    </Trigger>
                </ControlTemplate.Triggers>
            </ControlTemplate>
        </Setter.Value>
    </Setter>
</Style>

3 回答

0
尝试
```
<Button IsEnabled={Binding Path=IsGenericUser}" ... />
```
不应该要求 Path= ，但它可能会有所不同 .

通过在数据上下文中使用 this ，您确定's right? Wouldn' t使控件本身成为上下文 . 我似乎没错 .
回复于 2024-05-09T20:12:12+08:00
0

1）创建一个名为DisableDeactivating的新故事板并设置FillBehavior =“Stop”（Nicholas的建议）2）然后，在IsEnabled = false触发器的Trigger.ExitActions中添加一个用于DisableDeactivating的BeginStoryboard .

回复于 2024-05-09T20:12:12+08:00

你如何将属性设置为False / True？如果我按原样复制你的代码，它就完美无缺 . 必须有其他东西，你可能不会期望影响它，如按钮上的动画或清除绑定的东西 . 是否有更多可以发布的代码可能有助于澄清可能会执行此操作的内容？

这是我测试的代码：

<Window x:Class="WpfApplication6.Window1"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="Window1"
    Height="300"
    Width="300">
<Grid>
    <StackPanel x:Name="QuickListButtonsStackPanel">
        <Button IsEnabled="{Binding IsGenericUser}"
                Content="Bound Button" />
        <Button Content="Change Binding"
                Click="Button_Click" />
    </StackPanel>
</Grid>

public partial class Window1 : Window
{
    public Window1()
    {
        InitializeComponent();
        QuickListButtonsStackPanel.DataContext = this;
    }
    public static readonly DependencyProperty IsGenericUserProperty =
        DependencyProperty.Register(
            "IsGenericUser",
            typeof(bool),
            typeof(Window1));

    public bool IsGenericUser
    {
        get { return (bool)GetValue(IsGenericUserProperty); }
        set { SetValue(IsGenericUserProperty, value); }
    }

    private void Button_Click(object sender, RoutedEventArgs e)
    {
        IsGenericUser = !IsGenericUser;
    }
}

编辑：你也可以添加一个文本框，看看它是否正常工作，

<Button x:Name="uiButton"
        IsEnabled="{Binding IsGenericUser}"
        Style="{StaticResource BlackButtonStyle}"
        Content="Bound Button"/>
<TextBlock Text="{Binding ElementName=uiButton, Path=IsEnabled}" />

看起来问题只是样式的故事板，如果你添加它，它是否仍然显示IsEnabled是不应该的时候是假的？

回复于 2024-05-09T20:12:12+08:00

WPF - IsEnabled绑定到DependencyProperty无法正常工作

3 回答

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