Csharp 是否必须使用 WPF 和 MVVM 模式将 Revit 命令作为中继命令传递

我有几个外部命令，当通过Revit中的下拉按钮调用时，它们可以完美地工作.我试图通过使用MVVM模式在WPF窗口中创建一个命令列表来升级代码.在这些情况下，没有模型，而是与Revit文件对话的服务.下面是一个执行调用以移除material 的服务的示例:

using Autodesk.Revit.Attributes;
using Autodesk.Revit.DB;
using Autodesk.Revit.UI;

namespace DevTools.Services.Cleaner
{
    [Transaction(TransactionMode.Manual)]
    [Regeneration(RegenerationOption.Manual)]
    [Journaling(JournalingMode.NoCommandData)]
    public class PurgeAllMaterialsService : IExternalCommand
    {
        public Result Execute(ExternalCommandData commandData, ref string message, ElementSet elements)
        {
            var uiDoc = commandData.Application.ActiveUIDocument;
            var doc = uiDoc.Document;
        try
        {
            using Transaction trans = new(doc, "Delete all materials");

            var allMaterials = new FilteredElementCollector(doc)
                .OfClass(typeof(Material))
                .ToElementIds();

            var count = 0;

            trans.Start();
            foreach (var id in allMaterials)
            {
                try
                {
                    var m = doc.GetElement(id) as Material;
                    {
                        uiDoc.Document.Delete(id);
                        count++;
                    }
                }
                catch (Exception ex)
                {
                    message = ex.Message;
                    return Result.Failed;
                }
            }
            trans.Commit();
            TaskDialog.Show("Delete All Materials", count + " materials have been deleted");
            return Result.Succeeded;
        }
        catch (Autodesk.Revit.Exceptions.OperationCanceledException)
        {
            return Result.Cancelled;
        }
        catch (Exception ex)
        {
            message = ex.Message;
            return Result.Failed;
        }
    }
}
}

视图模型将服务传递给命令

using DevTools.Services.Cleaner;

namespace DevTechTools.ViewModels
{
    public class CleanerViewModel
    {
        public PurgeAllMaterialsService PurgeMaterialCommand { get; }
        public CleanerViewModel(PurgeAllMaterialsService purgeAllMaterials)
        {
            PurgeMaterialCommand = new PurgeAllMaterialsService();
        }
    }
}

并且该命令将服务传递给该视图.

using System.Windows.Input;
using CommunityToolkit.Mvvm.Input;
using DevTechTools.Services.Cleaner;

namespace DevTools.ViewModels
{
    public partial class CleanerViewModel
    {
        public ICommand PurgeMaterialCommand { get; }
        public CleanerViewModel(PurgeAllMaterialsService purgeAllMaterials)
        {
            PurgeMaterialCommand = new RelayCommand(WipeMaterials);
        }

        [RelayCommand]
        private void WipeMaterials()
        {
            var purgeAllMaterials = new PurgeAllMaterialsService();
        }
    }
}

在该视图中，该命令由如下所示的按钮调用.

<Button Content="Purge Materials"
        Command="{Binding PurgeMaterialCommand, Mode=OneWay}"
        Width="200"
        Height="28"
        Margin="0,10,0,0"
        BorderBrush="Transparent"
        Background="{StaticResource HeaderBackgroundBrush}"
        Foreground="{StaticResource LightBrush}" />

问题是该按钮不执行该命令.遗漏了什么？WPF窗口是否阻止正在发送的命令？