Csharp 使用 LINQ 过滤 DirectoryInfo 的 ObservableCollection

我使用MVVM用DirectoryInfo及其所有子目录和文件填充TreeView.

然后我想和LINQ一起在树视图中搜索.where()，但我只搜索顶级目录，而不是文件.

I'm creating the treeview/DirectoryInfo with a recursive method:

  public class ItemProvider
    {
        public ObservableCollection<Item> GetItems(string path)
        {
            var items = new ObservableCollection<Item>();

            if (System.IO.Directory.Exists(path))
            {
                

                var dirInfo = new DirectoryInfo(path);

                foreach (var directory in dirInfo.EnumerateDirectories())
                {
                    var item = new DirectoryItem
                    {
                        Name = directory.Name,
                        Path = directory.FullName,
                        Items = GetItems(directory.FullName)
                    };

                    items.Add(item);
                }

                foreach (var file in dirInfo.EnumerateFiles())
                {
                    InteropBitmap thumbImg = ShellFile.FromFilePath(file.FullName).Thumbnail.BitmapSource as InteropBitmap;
                    thumbImg.Freeze();

                    var item = new FamilyItem
                    {
                        Name = file.Name,
                        Path = file.FullName,
                        FamImage = thumbImg
                    };

                    if (item.Name.Contains(".rfa"))
                    {

                    items.Add(item);

                    }

                }

                return items;
            }
            else
            {

                return items;
            }
        }
            
       

DirectoryItem和FamilyItem都继承了一个名为Item的模型:

Item model:

public class Item
    {
        public string Name { get; set; }
        public string Path { get; set; }
        public InteropBitmap FamImage { get; set; }
    }

DirectoryItem model:

public class DirectoryItem : Item

    {
        public ObservableCollection<Item> Items { get; set; }
    
        public DirectoryItem()
        {
        Items = new ObservableCollection<Item>();
        }
    }

FamilyItem:

 public class FamilyItem : Item
    {

    }

I'm filtering the collection with:

Items = new ObservableCollection<Item>(ItemsCache.Where(x => x.Name.ToLower().Contains(SearchText.ToLower())));

我只得到匹配的顶级目录-我想得到所有匹配的"end"文件-我该怎么做呢？