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ViewModels/EditInstrumentWindowViewModel.cs

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+using System.Collections.ObjectModel;
+using System.Linq;
+using CRAWLER.Infrastructure;
+using CRAWLER.Models;
+
+namespace CRAWLER.ViewModels;
+
+internal sealed class EditInstrumentWindowViewModel : ObservableObject
+{
+    private readonly InstrumentRecord _draft;
+    private PendingPdfFile _selectedPendingPdf;
+
+    public EditInstrumentWindowViewModel(InstrumentRecord draft, bool isNewRecord)
+    {
+        _draft = draft ?? new InstrumentRecord();
+        PendingPdfFiles = new ObservableCollection<PendingPdfFile>();
+        ExistingAttachments = new ObservableCollection<PdfAttachment>(_draft.Attachments ?? Enumerable.Empty<PdfAttachment>());
+        WindowTitle = isNewRecord ? "Новая запись" : $"Редактирование: {(_draft.RegistryNumber ?? _draft.Name)}";
+    }
+
+    public string WindowTitle { get; }
+
+    public ObservableCollection<PendingPdfFile> PendingPdfFiles { get; }
+
+    public ObservableCollection<PdfAttachment> ExistingAttachments { get; }
+
+    public PendingPdfFile SelectedPendingPdf
+    {
+        get { return _selectedPendingPdf; }
+        set { SetProperty(ref _selectedPendingPdf, value); }
+    }
+
+    public InstrumentRecord Draft
+    {
+        get { return _draft; }
+    }
+
+    public void AddPendingFiles(IReadOnlyList<string> paths)
+    {
+        foreach (var path in paths.Where(path => !string.IsNullOrWhiteSpace(path)))
+        {
+            if (PendingPdfFiles.Any(item => string.Equals(item.SourcePath, path, StringComparison.OrdinalIgnoreCase)))
+            {
+                continue;
+            }
+
+            PendingPdfFiles.Add(new PendingPdfFile
+            {
+                SourcePath = path,
+                DisplayName = System.IO.Path.GetFileName(path)
+            });
+        }
+    }
+
+    public void RemovePendingSelected()
+    {
+        if (SelectedPendingPdf != null)
+        {
+            PendingPdfFiles.Remove(SelectedPendingPdf);
+        }
+    }
+
+    public string[] GetPendingPaths()
+    {
+        return PendingPdfFiles.Select(item => item.SourcePath).ToArray();
+    }
+
+    public bool Validate(out string errorMessage)
+    {
+        if (string.IsNullOrWhiteSpace(Draft.Name))
+        {
+            errorMessage = "Укажите наименование средства измерения.";
+            return false;
+        }
+
+        errorMessage = null;
+        return true;
+    }
+}