WPF

Question

我有一个关闭按钮，它绑定到我的主视图模型中定义的关闭命令，但由于某种原因它没有触发：

mainview.xaml中的按钮：

<Button Grid.Row="0" Style="{DynamicResource MyButtonStyle}" Margin="270,3,10,7"
                    Command="{Binding CloseCommand}"/>

MainViewModel 中的命令声明：

 public class MainViewModel : BaseViewModel
    {

        public ICommand CloseCommand { get; set; }

    }

CloseCommand.cs中的命令定义：

public class CloseCommand : ICommand
{
    public event EventHandler CanExecuteChanged;

    public bool CanExecute(object parameter)
    {
        return true;
    }

    public void Execute(object parameter)
    {
        System.Windows.Application.Current.Shutdown();
    }
}

我在 CloseCommand 设置了一个断点，但它甚至没有到达那里，这是怎么回事？

Answer 1

我认为Rufo爵士指出了您的问题。但我想推荐你看看Community Toolkit MVVM。它的源代码生成器将帮助您处理 MVVM 相关代码。

例如，您的 ViewModel...

using CommunityToolkit.Mvvm.ComponentModel;
using CommunityToolkit.Mvvm.Input;

namespace WpfCloseCommandSample;

[ObservableObject]
// This class needs to be "partial" for the source generator.
public partial class MainWindowViewModel
{
    [ObservableProperty]
    // The source generator will create a
    // "ButtonName" property for you.
    private string _buttonName;

    [ICommand]
    // The source generator will create a
    // "CloseCommand" command for you.
    private void Close()
    {
        System.Windows.Application.Current.Shutdown();
    }

    // Constructor
    public MainWindowViewModel()
    {
        this.ButtonName = "Click here to close the window";
    }
}

还有你的XAML...

<Window
    x:Class="WpfCloseCommandSample.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:local="clr-namespace:WpfCloseCommandSample"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    Title="MainWindow"
    Width="800"
    Height="450"
    mc:Ignorable="d">
    <Window.DataContext>
        <local:MainWindowViewModel />
    </Window.DataContext>
    <Grid>
        <Button Command="{Binding CloseCommand}" Content="{Binding ButtonName}" />
    </Grid>
</Window>

WPF - 未调用命令绑定

WPF - command binding not being called

c#

.net

mvvm