為什么我不能在WPF中使用IsMouseOver屬性超過1次？-有解無憂

<Window x:Class="KrakenZ_Tweaker.MainWindow"
    ResizeMode="CanMinimize"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    xmlns:local="clr-namespace:KrakenZ_Tweaker"
    mc:Ignorable="d"
    Title="KrakenZ Tweaker" Height="700" Width="1000" >
<Grid Background="#FF4E4E4E" Margin="0,0,0,0" >


    <StackPanel HorizontalAlignment="Left" Background="#FF121820" Height="700" Width="300">
        <Image  HorizontalAlignment="Center" Margin="0,30,0,12" Height="125" Width="140" Source="/KrakenZ-Tweaker-Logo.ico"/>
        <TextBlock Margin="0,0,0,9" TextWrapping="Wrap" Text="  KrakenZ Tweaker" FontFamily="Montserrat" FontSize="30" Foreground="White" Height="34" Width="257"/>
        <Separator Width="187" Height="8" Background="Gray"/>
        <Button x:Name="Restore_Point" Margin="10" Height="47" Width="279" BorderBrush="{x:Null}" Foreground="White" FontFamily="Bahnschrift" FontSize="25" Content="Restore Point" Cursor="Hand" Click="Restore_Point_Click">
            <Button.Style>
                <Style TargetType="{x:Type Button}">
                    <Setter Property="Background" Value="#175EBD"/>
                    <Setter Property="Template">
                        <Setter.Value>
                            <ControlTemplate TargetType="{x:Type Button}">
                                <Border Background="{TemplateBinding Background}">
                                    <ContentPresenter HorizontalAlignment="Center" VerticalAlignment="Center"/>
                                </Border>
                            </ControlTemplate>
                        </Setter.Value>
                    </Setter>
                    <Style.Triggers>
                        <Trigger Property="IsMouseOver" Value="True">
                            <Setter Property="Background" Value="DarkGoldenrod"/>
                        </Trigger>
                    </Style.Triggers>
                </Style>
            </Button.Style>
            <Button.Resources>
                <Style TargetType="Border">
                    <Setter Property="CornerRadius" Value="8"/>
                </Style>
            </Button.Resources>
        </Button>
        <Button x:Name="Disable_Unnecessary_Services" Margin="10" Height="47" Width="279" BorderBrush="{x:Null}" Foreground="White" FontFamily="Bahnschrift" FontSize="25" Content="Disable Services" Cursor="Hand" Click="Disable_Unnecessary_Services_Click">
            <Button.Style>
                <Style TargetType="{x:Type Button}">
                    <Setter Property="Background" Value="#121820"/>
                    <Setter Property="Template">
                        <Setter.Value>
                            <ControlTemplate TargetType="{x:Type Button}">
                                <Border Background="{TemplateBinding Background}">
                                    <ContentPresenter HorizontalAlignment="Center" VerticalAlignment="Center"/>
                                </Border>
                            </ControlTemplate>
                        </Setter.Value>
                    </Setter>
                    <Style.Triggers>
                        <Trigger Property="IsMouseOver" Value="True">
                            <Setter Property="Background" Value="DarkGoldenrod"/>
                        </Trigger>
                    </Style.Triggers>
                </Style>
            </Button.Style>
            <Button.Resources>
                <Style TargetType="Border">
                    <Setter Property="CornerRadius" Value="8"/>
                </Style>
            </Button.Resources>
        </Button>
        <Button x:Name="Clear_Junk_Files" Margin="10" Height="47" BorderBrush="#121820" Width="279" Foreground="White" FontFamily="Bahnschrift" FontSize="25" Content="Clear Junk Files" Cursor="Hand" Click="Clear_Junk_Files_Click">
            <Button.Style>
                <Style TargetType="{x:Type Button}">
                    <Setter Property="Background" Value="#121820"/>
                    <Setter Property="Template">
                        <Setter.Value>
                            <ControlTemplate TargetType="{x:Type Button}">
                                <Border Background="{TemplateBinding Background}">
                                    <ContentPresenter HorizontalAlignment="Center" VerticalAlignment="Center"/>
                                </Border>
                            </ControlTemplate>
                        </Setter.Value>
                    </Setter>
                    <Style.Triggers>
                        <Trigger Property="IsMouseOver" Value="True">
                            <Setter Property="Background" Value="DarkGoldenrod"/>
                        </Trigger>
                    </Style.Triggers>
                </Style>
            </Button.Style>
            <Button.Resources>
                <Style TargetType="Border">
                    <Setter Property="CornerRadius" Value="8"/>
                </Style>
            </Button.Resources>
        </Button>
        <Button x:Name="Useful_Optimization" Margin="10" Height="47" Width="279" BorderBrush="{x:Null}" Foreground="White" FontFamily="Bahnschrift" FontSize="25" Content="Useful Optimizations" Cursor="Hand" Click="Useful_Optimization_Click">
            <Button.Style>
                <Style TargetType="{x:Type Button}">
                    <Setter Property="Background" Value="#121820"/>
                    <Setter Property="Template">
                        <Setter.Value>
                            <ControlTemplate TargetType="{x:Type Button}">
                                <Border Background="{TemplateBinding Background}">
                                    <ContentPresenter HorizontalAlignment="Center" VerticalAlignment="Center"/>
                                </Border>
                            </ControlTemplate>
                        </Setter.Value>
                    </Setter>
                    <Style.Triggers>
                        <Trigger Property="IsMouseOver" Value="True">
                            <Setter Property="Background" Value="DarkGoldenrod"/>
                        </Trigger>
                    </Style.Triggers>
                </Style>
            </Button.Style>
            <Button.Resources>
                <Style TargetType="Border">
                    <Setter Property="CornerRadius" Value="8"/>
                </Style>
            </Button.Resources>
        </Button>

    </StackPanel>
    <StackPanel x:Name="User_Control" Margin="308,2,6,0"/>







</Grid>

這是我的 MainWindow.XAML 代碼。

 private void Restore_Point_Click(object sender, RoutedEventArgs e)
    {
        Restore_Point.Background = (Brush)(new BrushConverter().ConvertFrom("#175EBD"));
        Disable_Unnecessary_Services.Background = (Brush)(new BrushConverter().ConvertFrom("#121820"));
        Clear_Junk_Files.Background = (Brush)(new BrushConverter().ConvertFrom("#121820"));
        Useful_Optimization.Background = (Brush)(new BrushConverter().ConvertFrom("#121820"));
        User_Control.Children.Remove(UC2);
        User_Control.Children.Remove(UC3);
        User_Control.Children.Remove(UC4);
        User_Control.Children.Add(defaultUC);
       
       

    }

    private void Disable_Unnecessary_Services_Click(object sender, RoutedEventArgs e)
    {
       Disable_Unnecessary_Services.Background = (Brush)(new BrushConverter().ConvertFrom("#175EBD"));
        Restore_Point.Background = (Brush)(new BrushConverter().ConvertFrom("#121820"));
        Clear_Junk_Files.Background = (Brush)(new BrushConverter().ConvertFrom("#121820"));
        Useful_Optimization.Background = (Brush)(new BrushConverter().ConvertFrom("#121820"));
        User_Control.Children.Remove(defaultUC);
        User_Control.Children.Remove(UC3);
        User_Control.Children.Remove(UC4);
        User_Control.Children.Add(UC2);


    }

    private void Clear_Junk_Files_Click(object sender, RoutedEventArgs e)
    {
        Clear_Junk_Files.Background = (Brush)(new BrushConverter().ConvertFrom("#175EBD"));
        Disable_Unnecessary_Services.Background = (Brush)(new BrushConverter().ConvertFrom("#121820"));
        Restore_Point.Background = (Brush)(new BrushConverter().ConvertFrom("#121820"));
        Useful_Optimization.Background = (Brush)(new BrushConverter().ConvertFrom("#121820"));
        User_Control.Children.Remove(defaultUC);
        User_Control.Children.Remove(UC2);
        User_Control.Children.Remove(UC4);

        User_Control.Children.Add(UC3);
    }

    private void Useful_Optimization_Click(object sender, RoutedEventArgs e)
    {
        Useful_Optimization.Background = (Brush)(new BrushConverter().ConvertFrom("#175EBD"));
        Clear_Junk_Files.Background = (Brush)(new BrushConverter().ConvertFrom("#121820"));
        Disable_Unnecessary_Services.Background = (Brush)(new BrushConverter().ConvertFrom("#121820"));
        Restore_Point.Background = (Brush)(new BrushConverter().ConvertFrom("#121820"));
        User_Control.Children.Remove(defaultUC);
        User_Control.Children.Remove(UC2);
        User_Control.Children.Remove(UC3);
        User_Control.Children.Add(UC4);

    }

這些是所有按鈕的事件處理程式。這里發生的問題是我只能使用 IsMouseOver 屬性一次。單擊任何按鈕后，我無法使用此屬性。我認為這個問題是由于按鈕單擊的事件處理程式造成的，但我不確定這一點。請幫忙。提前致謝。

uj5u.com熱心網友回復：

通過Control.Background顯式/本地設定屬性，您可以覆寫/洗掉樣式觸發器。這種行為是需要的，并通過遵循依賴屬性的通用 WPF 值優先規則來實作。此外，您的代碼包含大量重復代碼，您應該始終避免這些重復代碼。

要保持這種特定于控制的（視覺）行為，您不能在 a 中定義相應的觸發器Style，而是在ControlTemplate.

如果像您的情況一樣，Button具有“已單擊”切換狀態，您通常更喜歡 a ToggleButton（或者在您的情況下甚至是 a RadioButton）。
這將使您能夠僅通過觸發器更方便地處理單擊狀態。
這將幫助您更好地理解您的代碼，因為現在可以在一個地方實作視覺效果（而不是將其分散到多種樣式和代碼隱藏中）。

出于這個原因，您通常應該避免為控制元件定義多個樣式（就像您所做的那樣），如果這些樣式不是全域的或本地定義Style的：使用Button.StyleandButton.Resources屬性定義兩個資源會使您的代碼難以閱讀。更好地將外觀相關配置直接移動到相應的模板元素（因為您已經覆寫了ControlTemplate）。

而且由于所有模板本質上都是相同的，因此您可以通過將它們提取到ResourceDictionary公共范圍內（例如Window.Resources）來輕松避免重復代碼。

您的固定和改進代碼如下所示：

<Window>
  <Window.Resources>
    <Style x:Key="RadioButtonStyle" 
           TargetType="RadioButton">
      <Setter Property="Background"
              Value="#121820" />
      <Setter Property="Template">
        <Setter.Value>
          <ControlTemplate TargetType="{x:Type RadioButton}">
            <Border x:Name="Border"
                    CornerRadius="8"
                    Background="{TemplateBinding Background}">
              <ContentPresenter HorizontalAlignment="Center"
                                VerticalAlignment="Center" />
            </Border>

            <!-- 
              Note that the order of the triggers is important. 
              To allow the IsMouseOver trigger to have a higher priority than the IsChecked trigger, 
              the IsMouseOver trigger must be defined after the IsChecked trigger. 
              Trigger priority is interpreted low to high from top to down 
            -->
            <ControlTemplate.Triggers>
              <Trigger Property="IsChecked"
                       Value="True">
                <Setter TargetName="Border"
                        Property="Background"
                        Value="#175EBD" />
              </Trigger>
              <Trigger Property="IsMouseOver"
                       Value="True">
                <Setter TargetName="Border"
                        Property="Background"
                        Value="DarkGoldenrod" />
              </Trigger>
            </ControlTemplate.Triggers>
          </ControlTemplate>
        </Setter.Value>
      </Setter>
    </Style>
  </Window.Resources>

  <StackPanel>
    <RadioButton x:Name="Restore_Point"
                 Style="{StaticResource RadioButtonStyle}"
                 Margin="10"
                 Height="47"
                 Width="279"
                 BorderBrush="{x:Null}"
                 Foreground="White"
                 FontFamily="Bahnschrift"
                 FontSize="25"
                 Content="Restore Point"
                 Cursor="Hand"
                 Click="Restore_Point_Click" />
    <RadioButton x:Name="Disable_Unnecessary_Services"
                 Style="{StaticResource RadioButtonStyle}"
                 Margin="10"
                 Height="47"
                 Width="279"
                 BorderBrush="{x:Null}"
                 Foreground="White"
                 FontFamily="Bahnschrift"
                 FontSize="25"
                 Content="Restore Point"
                 Cursor="Hand"
                 Click="Disable_Unnecessary_Services_Click" />
    <RadioButton x:Name="Clear_Junk_Files"
                 Style="{StaticResource RadioButtonStyle}"
                 Margin="10"
                 Height="47"
                 Width="279"
                 BorderBrush="{x:Null}"
                 Foreground="White"
                 FontFamily="Bahnschrift"
                 FontSize="25"
                 Content="Restore Point"
                 Cursor="Hand"
                 Click="Clear_Junk_Files_Click" />
  </StackPanel>
</Window>

由于按鈕的背景現在完全在 XAML 中處理，您現在可以清理事件處理程式。
現在Button.Click事件處理程式將如下所示：

private void Restore_Point_Click(object sender, RoutedEventArgs e)
{
  User_Control.Children.Remove(UC2);
  User_Control.Children.Remove(UC3);
  User_Control.Children.Remove(UC4);
  User_Control.Children.Add(defaultUC);
}

private void Disable_Unnecessary_Services_Click(object sender, RoutedEventArgs e)
{
  User_Control.Children.Remove(defaultUC);
  User_Control.Children.Remove(UC3);
  User_Control.Children.Remove(UC4);
  User_Control.Children.Add(UC2);
}

private void Clear_Junk_Files_Click(object sender, RoutedEventArgs e)
{
  User_Control.Children.Remove(defaultUC);
  User_Control.Children.Remove(UC2);
  User_Control.Children.Remove(UC4);
  User_Control.Children.Add(UC3);
}

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標籤：C＃wpf

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