WPF弹出窗口神奇地消失了

本文关键字：消失了 神奇 窗口 WPF | 更新日期: 2023-09-27 18:25:11

WPF弹出窗口没有按预期工作。因此，当鼠标进入"测试："按钮时，行为是显示弹出窗口，然后单击弹出窗口上的"关闭"按钮将隐藏弹出窗口。在我左键单击"测试"按钮之前，一切都很好。之后，鼠标事件事件在"测试"按键上启动，但弹出窗口不会显示。

如果有人能在这里帮我，那就太好了。

谢谢，代码

<Window x:Class="WpfApplication1.MainWindow"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="MainWindow" Height="350" Width="525">
<Grid>
    <Grid Margin="10">
        <Button x:Name="btnTest"  Width="100" Height="25" 
                MouseEnter="btnTest_MouseEnter">Test Button</Button>
        <Popup Name="MyPopup"
               PlacementTarget="{Binding ElementName=btnTest}"
               Placement="Mouse"
               StaysOpen="False">
            <StackPanel Background="PaleGreen">
                <Label HorizontalAlignment="Center">I am a popup</Label>
                <Button Click="Hide_Click" Content="Close"/>
            </StackPanel>
        </Popup>
    </Grid>
</Grid>

背后的代码

using System;
using System.Collections.Generic;
using System.Windows;
using System.Windows.Input;
namespace WpfApplication1
{
/// <summary>
/// Interaction logic for MainWindow.xaml
/// </summary>
public partial class MainWindow : Window
{
    public MainWindow()
    {
        InitializeComponent();
    }
    private void Show_Click(object sender, RoutedEventArgs e)
    {
        MyPopup.IsOpen = true;
    }
    private void Hide_Click(object sender, RoutedEventArgs e)
    {
        MyPopup.IsOpen = false;
    }
    private void btnTest_MouseEnter(object sender, MouseEventArgs e)
    {
        MyPopup.IsOpen = true;
    }
}
}

WPF弹出窗口神奇地消失了

我试过你的代码，但我不明白为什么它能工作。然而，我尝试用触发器等实现您想要的功能。我已经测试过了，它似乎有效：

<Window x:Class="WpfApplication1.MainWindow"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="MainWindow" Height="350" Width="525">
<Grid>
    <Grid Margin="10">
        <Button x:Name="btnTest"  Width="100" Height="25" Content="Test Button">
            <Button.Triggers>
                <EventTrigger RoutedEvent="Button.MouseEnter">
                    <BeginStoryboard>
                        <Storyboard>
                            <BooleanAnimationUsingKeyFrames 
            Storyboard.TargetName="MyPopup" 
            Storyboard.TargetProperty="IsOpen"
            Duration="0:0:1" FillBehavior="HoldEnd">
                                <DiscreteBooleanKeyFrame Value="True" KeyTime="0:0:0" />
                            </BooleanAnimationUsingKeyFrames>
                        </Storyboard>
                    </BeginStoryboard>
                </EventTrigger>
            </Button.Triggers>
        </Button>
        <Popup Name="MyPopup"
           PlacementTarget="{Binding ElementName=btnTest}"
           Placement="Mouse"
           StaysOpen="False">
            <StackPanel Background="PaleGreen">
                <Label HorizontalAlignment="Center">I am a popup</Label>
                <Button  Content="Close">
                    <Button.Triggers>
                        <EventTrigger RoutedEvent="Button.Click">
                            <BeginStoryboard>
                                <Storyboard>
                                    <BooleanAnimationUsingKeyFrames                 
            Storyboard.TargetName="MyPopup" 
            Storyboard.TargetProperty="IsOpen"
            Duration="0:0:1" FillBehavior="HoldEnd">
                                        <DiscreteBooleanKeyFrame Value="False" KeyTime="0:0:0" />
                                    </BooleanAnimationUsingKeyFrames>
                                </Storyboard>
                            </BeginStoryboard>
                        </EventTrigger>
                    </Button.Triggers>
                </Button>
            </StackPanel>
        </Popup>
    </Grid>
</Grid>
</Window>

我不确定是否有更短的路；可能有。

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