C# WPF 更新状态栏文本和进度来自另一个 window

Question

我有一个名为 "wpfMenu" 的 Main window，它有一个包含文本块和进度条的状态栏。状态栏需要从主 window 启动的单独 windows 上的运行方法更新（任何时候只有一个 window 打开）。

最好我想将最小值、最大值、进度、文本值传递给名为 "statusUpdate" 的 class 以更新进度，但我不知道从哪里开始以及任何更新示例我遇到的进度条是运行在同一个 window.

这是我到目前为止的状态栏代码

<Window
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:Custom="http://schemas.microsoft.com/winfx/2006/xaml/presentation/ribbon" x:Class="Mx.wpfMenu"
    Title="Mx - Menu" Height="600" Width="1000" Background="#FFF0F0F0" Closed="wpfMenu_Closed">
<Grid>
    <StatusBar x:Name="sbStatus" Height="26" Margin="0,0,0,0" VerticalAlignment="Bottom" HorizontalAlignment="Stretch">
        <StatusBar.ItemsPanel>
            <ItemsPanelTemplate>
                <Grid>
                    <Grid.RowDefinitions>
                        <RowDefinition Height="*"/>
                    </Grid.RowDefinitions>
                    <Grid.ColumnDefinitions>
                        <ColumnDefinition Width="4*"/>
                        <ColumnDefinition Width="Auto"/>
                    </Grid.ColumnDefinitions>
                </Grid>
            </ItemsPanelTemplate>
        </StatusBar.ItemsPanel>
        <StatusBarItem>
            <TextBlock Name="sbMessage" Text="{Binding statusUpdate.Message}"/>
        </StatusBarItem>
        <StatusBarItem Grid.Column="1">
            <ProgressBar Name="sbProgress" Width="130" Height="18" Minimum="0" Maximum="100" IsIndeterminate="False"/>
        </StatusBarItem>
    </StatusBar>
</Grid>

我的 class 的代码是

    public class statusUpdate : INotifyPropertyChanged
{
    private string _message;
    public event PropertyChangedEventHandler PropertyChanged;

    public statusUpdate()
    {

    }

    public statusUpdate (string value)
    {
        this._message = value;
    }

    public string Message
    {
        get { return _message; }
        set
        {
            _message = value;
            OnPropertyChanged("Message");
        }
    }

    void OnPropertyChanged(string _message)
    {
        PropertyChangedEventHandler handler = PropertyChanged;
        if (handler != null)
        {
            handler(this, new PropertyChangedEventArgs(_message));
        }
    }
}

Answer 1

这有几个步骤，但它们在其他地方都有很好的记录。这似乎是一个复杂的过程，但这是您将在 WPF 中反复执行的操作。

您将所有设置存储在 class 中是正确的。但是，此 class 需要实施 INotifyPropertyChanged 并在每个属性 setter.

中引发一个 PropertyChanged 事件

using System.ComponentModel;

public class StatusUpdate : INotifyPropertyChanged
{
    private string message;
    public event PropertyChangedEventHandler PropertyChanged;

    public StatusUpdate()
    {
    }

    public string Message
    {
        get { return this.message; }
        set
        {
            this.message = value;
            this.OnPropertyChanged("Message");
        }
    }

    void OnPropertyChanged(string propertyName)
    {
        PropertyChangedEventHandler handler = this.PropertyChanged;
        if (handler != null)
        {
            handler(this, new PropertyChangedEventArgs(propertyName));
        }
    }
}

然后您可以将其设为代码隐藏 class 的 public 属性，并将您的进度条属性绑定到它。

public partial class MainWindow : Window
{
    public MainWindow()
    {
        this.InitializeComponent();
    }

    public StatusUpdate Status { get; set; } = new StatusUpdate();

    private void PlayCommand_CanExecute(object sender, CanExecuteRoutedEventArgs e)
    {
        e.CanExecute = true;
    }

    public void PlayCommand_Executed(object sender, ExecutedRoutedEventArgs e)
    {
        this.Status.Message = "Play";
    }

    public void StopCommand_Executed(object sender, ExecutedRoutedEventArgs e)
    {
        this.Status.Message = "Stop";
    }
}

然后您可以将对相同 class 的引用传递给子窗体，当它们设置任何属性时，WPF 将捕获事件并更新 GUI。

如果您找不到任何这些步骤的示例，请告诉我。

这是您的 XAML 版本，其中包含我在上述示例中使用的绑定和按钮：

<Window x:Class="WpfProgressBar.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:local="clr-namespace:WpfProgressBar"
    mc:Ignorable="d"
    Title="MainWindow" Height="350" Width="525">
<Window.CommandBindings>
    <CommandBinding Command="Play" Executed="PlayCommand_Executed" CanExecute="PlayCommand_CanExecute" />
    <CommandBinding Command="Stop" Executed="StopCommand_Executed" />
</Window.CommandBindings>
<Grid>
    <StackPanel>
        <Button Content="Play" Command="Play" />
        <Button Content="Stop" Command="Stop" />
    </StackPanel>
    <StatusBar Height="26" Margin="0,0,0,0" VerticalAlignment="Bottom" HorizontalAlignment="Stretch">
        <StatusBar.ItemsPanel>
            <ItemsPanelTemplate>
                <Grid>
                    <Grid.RowDefinitions>
                        <RowDefinition Height="*"/>
                    </Grid.RowDefinitions>
                    <Grid.ColumnDefinitions>
                        <ColumnDefinition Width="4*"/>
                        <ColumnDefinition Width="Auto"/>
                    </Grid.ColumnDefinitions>
                </Grid>
            </ItemsPanelTemplate>
        </StatusBar.ItemsPanel>
        <StatusBarItem>
            <TextBlock Text="{Binding Status.Message, RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type Window}}, NotifyOnSourceUpdated=True}"/>
        </StatusBarItem>
        <StatusBarItem Grid.Column="1">
            <ProgressBar Width="130" Height="18" Minimum="0" Maximum="100" IsIndeterminate="False"/>
        </StatusBarItem>
    </StatusBar>
</Grid>
</Window>

注意，我通常不会像这样进行命令绑定，但不想陷入添加 RelayCommand

的复杂局面

C# WPF 更新状态栏文本和进度来自另一个 window

C# WPF Update Status bar text and progress from another window

c#

wpf

xaml

progress-bar

statusbar