WPF 将 Window 模板中的按钮绑定到 ViewModel 的命令

WPF bind a button from Window template to ViewModel's command

我有一个 window 看起来像这样

如您所见,'window bar' 本身有一个 button,我想绑定按钮命令到 ViewModel 的命令

这是可视化树的样子

我已经尝试了各种使用 RelativeSource 的组合,但无法找到一种方法来实现它..

如有任何帮助或想法,我们将不胜感激

window 本身的代码..

<dx:DXWindow x:Class="Chronos.WindowsApp.Windows.TimersCollectionWindow"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:dx="http://schemas.devexpress.com/winfx/2008/xaml/core"
             xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
             xmlns:themes="http://schemas.devexpress.com/winfx/2008/xaml/core/themekeys"
             mc:Ignorable="d" 
             Title="Timers" 
             ShowInTaskbar = "False" 
             ShowIcon="True" Icon="/Chronos.UserControls;component/Images/TimersWindowIconW.png"
             d:DesignHeight="80" d:DesignWidth="80"
             >

    <dx:DXWindow.Resources>
        <ControlTemplate x:Key="{themes:FloatingContainerThemeKey ThemeName=Mishcon, ResourceKey=FloatingContainerDragWidgetTemplate, IsThemeIndependent=True}" TargetType="{x:Type Thumb}">
            <Border Height="40" Background="Transparent" DockPanel.Dock="Left">
                <DockPanel HorizontalAlignment="Left">
                    <Button DockPanel.Dock="Left" Background="Transparent"
                            Width="70"
                            Height="35"
                            Command="{Binding RelativeSource={RelativeSource AncestorType=dx:DXWindow}, Path=RootControl.DataContext.NewTimmerCommand}"
                            >
                        <StackPanel Orientation="Horizontal" VerticalAlignment="Center">
                            <Image Source="{dx:DXImage Image=Add_32x32.png}" Width="24" VerticalAlignment="Center"/>
                            <TextBlock Text="Add" FontWeight="Bold" VerticalAlignment="Center"/>
                        </StackPanel>
                    </Button>
                </DockPanel>
            </Border>
        </ControlTemplate>
    </dx:DXWindow.Resources>
</dx:DXWindow>

我得到的错误是:

System.Windows.Data Error: 40 : BindingExpression path error: 'RootControl' property not found on 'object' ''TimersCollectionWindow' (Name='')'. BindingExpression:Path=RootControl.DataContext.NewTimmerCommand; DataItem='TimersCollectionWindow' (Name=''); target element is 'Button' (Name=''); target property is 'Command' (type 'ICommand')

正如我从你的绑定表达式错误中看到的那样, 上的对象试图找到你的路径是 TimersCollectionWindow,如果你的命令存在于此 class 那么我认为你应该像这样直接绑定:

按钮xaml代码

<Button DockPanel.Dock="Left" Background="Transparent"
                        Width="70"
                        Height="35"
                        Command="{Binding NewTimmerCommand, UpdateSourceTrigger=PropertyChanged, Mode = TwoWay}">

VM命令声明

    public ICommand NewTimmerCommand
    {
        get { return _newTimmerCommand; }
        set
        {
            _newTimmerCommand = value;
            OnPropertyChanged("NewTimmerCommand");
        }
    }

如果您的命令进入使用定义的 ContentTemplate 的对象的数据上下文,则只需执行下一步。由于您的 ContentTemplate 的目标类型是 Thumb,它肯定会在使用 ContentTemplate 时按时创建,Thumb 将从其父级继承其 DataContext,因此您可以依赖与 Thumb 的绑定并从中获取命令它(及其父级)数据上下文。

XAML 按钮代码

 <Button DockPanel.Dock="Left" Background="Transparent"
                        Width="70"
                        Height="35"
                        Command="{Binding 
                    RelativeSource={RelativeSource AncestorType={x:Type Thumb}}, 
                    Path=DataContext.NewTimmerCommand}">

更新

<Button DockPanel.Dock="Left" Background="Transparent"
                        Width="70"
                        Height="35"
                        Command="{Binding 
                    RelativeSource={RelativeSource AncestorType={x:Type the_type_of_RootControl}}, 
                    Path=DataContext.NewTimmerCommand}">

此致。