Question

在App.xaml中，为UserCheckBox定义了一种样式。并且在DataTrigger中，属性值为LightStyle = true; UserCheckBox应该更改背景。但是他没有改变。我尝试了通常的TextBlock并成功了。如何解决？

App.xaml

<Application x:Class="COP.App"
         xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
         xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
         xmlns:ModernButton="clr-namespace:ModernButton;assembly=ModernButton"
         xmlns:local="clr-namespace:COP"
         xmlns:local1="clr-namespace:COP.ViewModel"
         StartupUri="MainWindow.xaml">
<Application.Resources>       
    <Style x:Key="DefaultCheckBoxStyle" TargetType="local:UserCheckBox">
        <Setter Property="Background" Value="#C3C3C3"/>
        <Style.Triggers>
            <DataTrigger Binding="{Binding LightStyle}" Value="True">
                <Setter Property="Background" Value="White"/>
            </DataTrigger>
        </Style.Triggers>
    </Style>
    <Style x:Key="Sal" TargetType="TextBlock">
        <Setter Property="Background" Value="#C3C3C3"/>
        <Style.Triggers>
            <DataTrigger Binding="{Binding LightStyle}" Value="True">
                <Setter Property="Background" Value="White"/>
            </DataTrigger>
        </Style.Triggers>
    <local1:MainViewModel x:Key="MyViewModel" />
</Application.Resources>

UserCheckBox.xaml.cs

public partial class UserCheckBox : UserControl, INotifyPropertyChanged
{
    public UserCheckBox()
    {
        InitializeComponent();
        DataContext = this;
        MouseLeftButtonUp += delegate (object sender, MouseButtonEventArgs e) { IsChecked = !IsChecked; };
    }
    private bool _IsChecked = false;
    public bool IsChecked
    {
        get { return _IsChecked; }
        private set { _IsChecked = value; OnPropertyChanged("IsChecked"); }
    }

    public event PropertyChangedEventHandler PropertyChanged;

    protected void OnPropertyChanged(string name) => PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(name));
}

Login.xaml

<Page x:Class="COP.Pages.Login"
  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:local="clr-namespace:COP.Pages"
  xmlns:local1="clr-namespace:COP"
  xmlns:ModernButton="clr-namespace:ModernButton;assembly=ModernButton"
  mc:Ignorable="d" 
  d:DesignHeight="450" d:DesignWidth="400"
  Title="Login" DataContext="{DynamicResource MyViewModel}">
<Page.Resources>
    <local1:BoolToStyle x:Key="Convert1"></local1:BoolToStyle>
</Page.Resources>
<Grid Height="Auto">
    <local1:UserCheckBox x:Name="checkBox" HorizontalAlignment="Left" VerticalAlignment="Top" Style="{StaticResource DefaultCheckBoxStyle}">
    </local1:UserCheckBox>
    <TextBlock Margin="40,0,0,0" HorizontalAlignment="Left" Style="{StaticResource Sal}"></TextBlock>
</Grid>

DataTrigger不会更改用户控件属性

0 个答案: