按钮不起作用，无法找到合适的 setter 或 getter

Question

public class MainWindowViewModel : ViewModelBase
{
    public MainWindowViewModel()
    {

        Queue = new QueuePanelViewModel();
        Merge = new MergePanelViewModel();

        CurrentQueuePanel ??= new QueuePanel();
        CurrentMergePanel ??= new MergePanel();
        _selectedView = CurrentQueuePanel;

    }

    public QueuePanelViewModel Queue { get; }
    public MergePanelViewModel Merge { get; }

    private UserControl _selectedView;
    public UserControl SelectedView
    {
        get
        {
            return _selectedView;
        }
        set
        {
            _selectedView = value;
        }
    }

    private static QueuePanel CurrentQueuePanel { get; set; }
    private static MergePanel CurrentMergePanel { get; set; }



    private void OnPanelButtonClickHandler(object sender, RoutedEventArgs e)
    {
        switch (((Button)sender).Tag)
        {
            case "Queue":
                SelectedView = CurrentQueuePanel;
                break;
            case "Merge":
                SelectedView = CurrentMergePanel;
                break;
            default:
                ((Button)sender).Content = "Somethin went wrong...";
                break;

        }
        e.Handled = true;
    }
}

并且在 .axaml

  <Button Tag="Queue" Click="{Binding OnPanelButtonClickHandler}" ClickMode="Press" Margin="0" Grid.Row="0" Grid.Column="0" VerticalAlignment="Stretch" HorizontalAlignment="Stretch" Content="Queue" Classes="btn" />

按钮事件在我尝试过的任何方式下都不起作用。在这次尝试中它给了我例外

'Unable to find suitable setter or adder for property Click of type Avalonia.Controls:Avalonia.Controls.Button for argument Avalonia.Markup:Avalonia.Data.Binding, available setter parameter lists are: System.EventHandler`1[[Avalonia.Interactivity.RoutedEventArgs, Avalonia.Interactivity, Version=0.10.12.0, Culture=neutral, PublicKeyToken=c8d484a7012f9a8b]] Line 40, position 26.' Line number '40' and line position '26'.

如果我使用 Command 而不是 Click，它会编译但按钮会被禁用。

Answer 1

你得到这个异常是因为 Click 是 RoutedEvent 而 OnPanelButtonClickHandler 应该在 *.axaml.cs 后面的代码中。

如果您想从视图中调用视图模型中的函数，您应该使用 Command 属性并绑定到函数或在视图模型中实现命令。

在您的情况下，当您绑定到命令时按钮处于非活动状态，因为您没有传递所需的参数。这应该有效：

private void OnPanelButtonClickHandler(string parameter)

<Button Command="{Binding OnPanelButtonClickHandler}" CommandParameter="Queue" .../>

您可以在 docs

中找到更多信息

按钮不起作用，无法找到合适的 setter 或 getter

Button will not work, unable to find suitable setter or getter

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