WPF - 数据触发器的问题，它只工作一次

Question

我使用只工作一次的 DataTrigger 有问题。

按钮"btnLokaty"仅在运行程序期间首次触发了故事板"PlikZLokatamiStory"。

我已经在我的项目中安装了"PropertyChanged.Fody"，它工作正常。属性"PlikZLokatami文件名检查"工作正常。复选框"test"显示"PlikZLokatami文件名检查"的值。

谁能帮我解决问题？ 很多谢谢

此致敬意

XAML

<Window x:Class="LokatyNegocjowane.View.MainWindow"
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:vm="clr-namespace:LokatyNegocjowane.Viemodel"
xmlns:materialDesign="http://materialdesigninxaml.net/winfx/xaml/themes"
mc:Ignorable="d"
x:Name="wndMain" Title="MainWindow" Height="600" Width="800" WindowStyle="None" WindowStartupLocation="CenterScreen">
<Window.Resources>
<Storyboard x:Key="PlikZLokatamiStory">
<ThicknessAnimationUsingKeyFrames Storyboard.TargetProperty="(FrameworkElement.Margin)" Storyboard.TargetName="btnLokaty">
<EasingThicknessKeyFrame KeyTime="0" Value="0,0,10,0"/>
<EasingThicknessKeyFrame KeyTime="0:0:1" Value="-100,0,10,0"/>
</ThicknessAnimationUsingKeyFrames>
</Storyboard>
<Storyboard x:Key="ControlOpacity">
<DoubleAnimationUsingKeyFrames Storyboard.TargetProperty="(UIElement.Opacity)">
<EasingDoubleKeyFrame KeyTime="0" Value="0"/>
<EasingDoubleKeyFrame KeyTime="0:0:1" Value="1"/>
</DoubleAnimationUsingKeyFrames>
</Storyboard>
<Storyboard x:Key="PlikZLokatamiStoryBack">
<ThicknessAnimationUsingKeyFrames Storyboard.TargetProperty="(FrameworkElement.Margin)" Storyboard.Target="{x:Reference btnLokaty}">
<EasingThicknessKeyFrame KeyTime="0" Value="-100,0,10,0"/>
<EasingThicknessKeyFrame KeyTime="0:0:1" Value="0,0,10,0"/>
</ThicknessAnimationUsingKeyFrames>
</Storyboard>
<Storyboard x:Key="ControlOpacityBack">
<DoubleAnimationUsingKeyFrames Storyboard.TargetProperty="(UIElement.Opacity)">
<EasingDoubleKeyFrame KeyTime="0" Value="1"/>
<EasingDoubleKeyFrame KeyTime="0:0:1" Value="0"/>
</DoubleAnimationUsingKeyFrames>
</Storyboard>
</Window.Resources>
<Window.DataContext>
<vm:ViewModel/>
</Window.DataContext>
<Grid Background="#FF3580BF">
<StackPanel Height="150" VerticalAlignment="Top">
<Image Height="150" Source="..Resourcesbaner.jpg" HorizontalAlignment="Center" Stretch="Fill"/>
</StackPanel>
<StackPanel>
<CheckBox x:Name="test" IsChecked="{Binding PlikZLokatamiFileNameCheck}" Margin="0 150"/>
</StackPanel>
<StackPanel x:Name="StackPanelMenu" Width="600" HorizontalAlignment="Center" Margin="0 180 0 0">
<StackPanel x:Name="spLokaty" VerticalAlignment="Center" Orientation="Horizontal" Height="60">
<StackPanel.Style>
<Style TargetType="{x:Type StackPanel}">
<Style.Triggers>
<Trigger Property="Control.IsMouseOver" Value="True">
<Setter Property="Background" Value="#557080BF"/>
<Setter Property="Opacity" Value="5"/>
</Trigger>
</Style.Triggers>
</Style>
</StackPanel.Style>
<StackPanel x:Name="spPlikZLokatami" VerticalAlignment="Center" Margin="250 0 10 0">
<Button x:Name="btnLokaty" Background="Transparent" HorizontalAlignment="Center" BorderThickness="0" Command="{Binding WybierzPlikZLokatami}" Foreground="White">
<Button.Style>
<Style TargetType="{x:Type Button}">
<Style.Triggers>
<DataTrigger Binding="{Binding PlikZLokatamiFileNameCheck}" Value="True">
<DataTrigger.EnterActions>
<BeginStoryboard Storyboard="{StaticResource PlikZLokatamiStory}"/>
</DataTrigger.EnterActions>
</DataTrigger>
<Trigger Property="IsMouseOver" Value="True">
<Setter Property="Cursor" Value="Hand"/>
<Setter Property="Background" Value="Transparent"/>
</Trigger>
</Style.Triggers>
</Style>
</Button.Style>
<StackPanel Orientation="Horizontal" VerticalAlignment="Center">
<materialDesign:PackIcon Kind="File" Width="20" Height="20" VerticalAlignment="Center"/>
<TextBlock Text="Plik z lokatami" FontSize="10" VerticalAlignment="Center"/>
</StackPanel>
</Button>
</StackPanel>
<StackPanel x:Name="spFileName" VerticalAlignment="Center" Orientation="Horizontal">
<TextBlock x:Name="tbLokaty" Foreground="White" Text="{Binding PlikZLokatamiFileName}" Opacity="0">
<TextBlock.Style>
<Style>
<Style.Triggers>
<DataTrigger Binding="{Binding PlikZLokatamiFileNameCheck}" Value="True">
<DataTrigger.EnterActions>
<BeginStoryboard Storyboard="{StaticResource ControlOpacity}"/>
</DataTrigger.EnterActions>
</DataTrigger>
</Style.Triggers>
</Style>
</TextBlock.Style>
</TextBlock>
<Button Background="Transparent" BorderBrush="{x:Null}" Opacity="0" Command="{Binding UsunPlikLokat}">
<Button.Style>
<Style TargetType="{x:Type Button}">
<Style.Triggers>
<Trigger Property="IsMouseOver" Value="True">
<Setter Property="Cursor" Value="Hand"/>
</Trigger>
<DataTrigger Binding="{Binding PlikZLokatamiFileNameCheck}" Value="True">
<DataTrigger.EnterActions>
<BeginStoryboard Storyboard="{StaticResource ControlOpacity}"/>
</DataTrigger.EnterActions>
</DataTrigger>
</Style.Triggers>
</Style>
</Button.Style>
<Button.Triggers>
<EventTrigger RoutedEvent="Button.Click">
<BeginStoryboard Storyboard="{StaticResource PlikZLokatamiStoryBack}"/>
<BeginStoryboard Storyboard="{StaticResource ControlOpacityBack}"/>
</EventTrigger>
</Button.Triggers>
<materialDesign:PackIcon Kind="RemoveCircle" Foreground="Red"/>
</Button>
</StackPanel>
</StackPanel>
<ListView Height="60">
<Button Background="Transparent" BorderThickness="0" Command="{Binding WybierzPlikZWnioskami}">
<Button.Content>
<StackPanel Orientation="Horizontal" VerticalAlignment="Center">
<materialDesign:PackIcon Kind="File" Width="20" Height="20" VerticalAlignment="Center"/>
<TextBlock Text="Plik z wnioskami" FontSize="10" VerticalAlignment="Center"/>
</StackPanel>
</Button.Content>
</Button>
</ListView>
<ListView Height="50">
<Button Background="Transparent" BorderThickness="0" Command="{Binding WybierzPlikZPracownikamiBOKZ}">
<Button.Content>
<StackPanel Orientation="Horizontal" VerticalAlignment="Center">
<materialDesign:PackIcon Kind="Worker" Width="20" Height="20" VerticalAlignment="Center"/>
<TextBlock Text="Pracownicy BOKZ" FontSize="10" VerticalAlignment="Center"/>
</StackPanel>
</Button.Content>
</Button>
</ListView>
<ListView Height="60">
<Button Background="Transparent" BorderThickness="0" Command="{Binding WyjdzCommand}">
<Button.Content>
<StackPanel Orientation="Horizontal" VerticalAlignment="Center">
<materialDesign:PackIcon Kind="ExitToApp" Width="20" Height="20" VerticalAlignment="Center"/>
<TextBlock Text="Wyście" FontSize="10" VerticalAlignment="Center"/>
</StackPanel>
</Button.Content>
</Button>
</ListView>
</StackPanel>
<StackPanel x:Name="stackPanel" Orientation="Horizontal" VerticalAlignment="Top" Height="40" HorizontalAlignment="Left" Margin="0 150">
<Button x:Name="btnZamknijMenu" ToolTip="Zamknij menu" Width="30" Height="30" Padding="0" Visibility="Collapsed" Background="{x:Null}" BorderBrush="{x:Null}">
<materialDesign:PackIcon Kind="Menu"/>
<Button.Triggers>
<EventTrigger RoutedEvent="Button.Click">
<BeginStoryboard Storyboard="{StaticResource ZamknijMenu}"/>
</EventTrigger>
</Button.Triggers>
</Button>
</StackPanel>
<StackPanel>
<Button Content="START" Margin="200, 450" Height="50" Command="{Binding Start}"/>
</StackPanel>
</Grid>

我的视图模型

using GalaSoft.MvvmLight.Command;
using Microsoft.Win32;
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Input;
namespace LokatyNegocjowane.Viemodel
{
public class ViewModel : INotifyPropertyChanged
{
public event PropertyChangedEventHandler PropertyChanged;
private string plikZLokatamiFullPath;
private string plikZWnioskamiFullPath;
private string plikZPracownikamiBOKZFullPath;
public ICommand WyjdzCommand { get; set; }
public ICommand WybierzPlikZLokatami { get; set; }
public ICommand WybierzPlikZWnioskami { get; set; }
public ICommand WybierzPlikZPracownikamiBOKZ { get; set; }
public ICommand Start { get; set; }
public ICommand UsunPlikLokat { get; set; }
public string PlikZWnioskamiFileName { get; set; }
public string PlikZPracownikamiBOKZFileName { get; set; }
public Boolean PlikZLokatamiFileNameCheck { get; set; }
public string PlikZLokatamiFileName
{
get
{
return Path.GetFileName(plikZLokatamiFullPath);
}
set
{
plikZLokatamiFullPath = value;
if (value != null && value != "") PlikZLokatamiFileNameCheck = true;
else PlikZLokatamiFileNameCheck = false;
}
}
public ViewModel()
{
WyjdzCommand = new RelayCommand(exitApp);
WybierzPlikZLokatami = new RelayCommand(wybierzPlikZLokatami);
WybierzPlikZWnioskami = new RelayCommand(wybierzPlikZWnioskami);
WybierzPlikZPracownikamiBOKZ = new RelayCommand(wybierzPlikZPracownikamiBOKZ);
UsunPlikLokat = new RelayCommand(usunPlikLokat);
Start = new RelayCommand(start);
}
private void exitApp()
{
System.Windows.Application.Current.Shutdown();
}
private void wybierzPlikZLokatami()
{
OpenFileDialog open = new OpenFileDialog();
if (open.ShowDialog() == true)
{
plikZLokatamiFullPath = open.FileName;
PlikZLokatamiFileName = Path.GetFileName(open.FileName);
}
//PlikZLokatamiFileNameCheck = true;
}
private void wybierzPlikZWnioskami()
{
OpenFileDialog open = new OpenFileDialog();
if (open.ShowDialog() == true)
{
plikZWnioskamiFullPath = open.FileName;
PlikZWnioskamiFileName = Path.GetFileName(open.FileName);
}
}
private void wybierzPlikZPracownikamiBOKZ()
{
OpenFileDialog open = new OpenFileDialog();
if (open.ShowDialog() == true)
{
plikZPracownikamiBOKZFullPath = open.FileName;
PlikZPracownikamiBOKZFileName = Path.GetFileName(open.FileName);
}
}
private void start()
{
if (walidacja())
MessageBox.Show("OK");
else MessageBox.Show("Brak wymaganych raportów");
}
private Boolean walidacja()
{
if ((plikZLokatamiFullPath != null && plikZLokatamiFullPath != "") && (plikZWnioskamiFullPath != null && plikZWnioskamiFullPath != "") && (plikZPracownikamiBOKZFullPath != null && plikZPracownikamiBOKZFullPath != ""))
return true;
return false;
}
private void usunPlikLokat()
{
PlikZLokatamiFileName = null;
}
}
}

Answer 1

删除：

<Button.Triggers>
<EventTrigger RoutedEvent="Button.Click">
<BeginStoryboard Storyboard="{StaticResource PlikZLokatamiStoryBack}"/>
<BeginStoryboard Storyboard="{StaticResource ControlOpacityBack}"/>
</EventTrigger>
</Button.Triggers>

并更改：

<DataTrigger Binding="{Binding PlikZLokatamiFileNameCheck}" Value="True">
<DataTrigger.EnterActions>
<BeginStoryboard Storyboard="{StaticResource PlikZLokatamiStory}"/>
</DataTrigger.EnterActions>
</DataTrigger>

自：

<DataTrigger Binding="{Binding PlikZLokatamiFileNameCheck}" Value="True">
<DataTrigger.EnterActions>
<BeginStoryboard Storyboard="{StaticResource PlikZLokatamiStory}"/>
</DataTrigger.EnterActions>
<DataTrigger.ExitActions>
<BeginStoryboard Storyboard="{StaticResource PlikZLokatamiStoryBack}"/>
</DataTrigger.ExitActions>
</DataTrigger>

同样，对于 ControlOpacity 和 ControlOpacityBack 情节提要。

顺便说一句。我看到你正在使用GalaSoft.MvvmLight.Command;但对于wpf来说，最好使用GalaSoft.MvvmLight.CommandWpf;。除非你想手动提高可以执行更改。