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我想从测试中提出一个命令。我需要模拟 RibbonMenuItem 是 OriginalSource。不幸的是，我无法访问原始的 RibbonBar，因此也无法访问 RibbonMenuItem。因此，我在测试中创建了一个新的

RibbonMenuItem menuItem = new RibbonMenuItem();
menuItem.Command = Commands.AddCommand;
menuItem.CommandBindings.Add(new CommandBinding Commands.AddCommand));
menuItem.Header = "foobar";

（Commands 是一个包含我实现的所有命令的类。）

然后我尝试使用以下行引发命令：

Commands.AddCommand.Execute(null, menuItem);

但这不起作用。

创建一个测试项目后，我现在知道为什么它不起作用，但我不知道如何解决。这是我的测试项目的代码

XAML：

<Window x:Class="MakeOrBreak.MainWindow"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:ribbon="http://schemas.microsoft.com/winfx/2006/xaml/presentation/ribbon"
    Title="MainWindow" Height="350" Width="525">
  <Grid>
    <Grid.RowDefinitions>
      <RowDefinition />
      <RowDefinition />
    </Grid.RowDefinitions>
    <ribbon:Ribbon Grid.Row="0">
      <ribbon:RibbonSplitButton x:Name="splitButton" Label="Test">
        <ribbon:RibbonMenuItem x:Name="item1" Header="Item1" />
        <ribbon:RibbonMenuItem x:Name="item2" Header="Item2" />
      </ribbon:RibbonSplitButton>
    </ribbon:Ribbon>
    <TextBlock Grid.Row="1" x:Name="textblock" />
  </Grid>
</Window>

视图模型

public partial class MainWindow : Window
  {
    private int counter = 1;

    public static RoutedCommand ClickCommand = new RoutedCommand();

    public MainWindow()
    {
      InitializeComponent();

      CommandBinding commandBinding = new CommandBinding(ClickCommand, ExecuteClickCommand, CanExecuteClickCommand);

      splitButton.Command = ClickCommand;
      splitButton.CommandBindings.Add(commandBinding);

      RibbonMenuItem rmi = new RibbonMenuItem();
      rmi.Command = ClickCommand;
      rmi.CommandBindings.Add(new System.Windows.Input.CommandBinding(ClickCommand));
      rmi.Header = "foobar";

      // Without this line the command at the last line isn't automatically raised
      // splitButton.Items.Add(rmi);

      Style baseMenuItemStyle = splitButton.TryFindResource(typeof(Microsoft.Windows.Controls.Ribbon.RibbonMenuItem)) as Style;
      if (baseMenuItemStyle == null)
      {
        baseMenuItemStyle = new Style(typeof(Microsoft.Windows.Controls.Ribbon.RibbonMenuItem));
      }
      Style ribbonItemsStyle = new Style(typeof(Microsoft.Windows.Controls.Ribbon.RibbonMenuItem), baseMenuItemStyle);
      ribbonItemsStyle.Setters.Add(new Setter(Microsoft.Windows.Controls.Ribbon.RibbonMenuItem.CommandProperty, ClickCommand));
      splitButton.Resources.Add(typeof(Microsoft.Windows.Controls.Ribbon.RibbonMenuItem), ribbonItemsStyle);

      // simulate Click
      ClickCommand.Execute(null, rmi);
    }

    private void ExecuteClickCommand(object sender, ExecutedRoutedEventArgs e)
    {
      RibbonMenuItem originalSource = e.OriginalSource as RibbonMenuItem;
      if (originalSource != null)
      {
        textblock.Text = "Item Pressed " + counter++;
      }
      e.Handled = true;
    }

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

当我将 RibbonMenuItem rmi 添加到 RibbonSplitButton 时，该命令将被执行，否则不会执行。因为在我的实际项目中，RibbonMenuItem 只是像 rmi 在这里“闲逛”，所以没有提出命令。

如前所述，我在我的测试项目中无法访问 RibbonBar 本身，否则我将直接采用现有的 RibbonMenuItem。

您对如何使命令正常工作有任何想法吗？

private void OnExecuteAdd(object sender, ExecutedRoutedEventArgs e)
{
  RibbonMenuItem originalSource = e.OriginalSource as RibbonMenuItem;
  if (originalSource != null)
  {
    string header = originalSource.Header as string;
  }
  // ...
}
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