first commit

DCIT.App/Presentation/IUserDialogService.cs

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+using System.Collections.Generic;
+using System.Windows.Forms;
+using DCIT.Core.Models;
+
+namespace DCIT.App.Presentation
+{
+    public interface IUserDialogService
+    {
+        DialogResult ShowMessage(IWin32Window owner, string text, string caption, MessageBoxButtons buttons, MessageBoxIcon icon);
+
+        AutoExtractPreviewResult ShowAutoExtractPreview(IWin32Window owner, IList<ExtractionCandidate> candidates);
+    }
+
+    public sealed class AutoExtractPreviewResult
+    {
+        public DialogResult DialogResult { get; set; }
+
+        public IList<ExtractionCandidate> SelectedCandidates { get; set; } = new List<ExtractionCandidate>();
+    }
+}

DCIT.App/Presentation/ModernFolderPicker.cs

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+using System.IO;
+using System.Windows.Forms;
+
+namespace DCIT.App.Presentation
+{
+    internal static class ModernFolderPicker
+    {
+        public static bool TrySelectFolder(IWin32Window owner, string initialDirectory, out string selectedPath)
+        {
+            selectedPath = null;
+            using (var dialog = new OpenFileDialog())
+            {
+                dialog.ValidateNames = false;
+                dialog.CheckFileExists = false;
+                dialog.CheckPathExists = true;
+                dialog.FileName = "选择当前文件夹";
+                dialog.Filter = "文件夹|*.folder";
+                if (!string.IsNullOrWhiteSpace(initialDirectory) && Directory.Exists(initialDirectory))
+                {
+                    dialog.InitialDirectory = initialDirectory;
+                }
+
+                if (dialog.ShowDialog(owner) != DialogResult.OK)
+                {
+                    return false;
+                }
+
+                selectedPath = Path.GetDirectoryName(dialog.FileName);
+                return !string.IsNullOrWhiteSpace(selectedPath);
+            }
+        }
+    }
+}

DCIT.App/Presentation/UserDialogService.cs

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+using System.Collections.Generic;
+using System.Linq;
+using System.Windows.Forms;
+using DCIT.App.Forms;
+using DCIT.Core.Models;
+
+namespace DCIT.App.Presentation
+{
+    public sealed class UserDialogService : IUserDialogService
+    {
+        public DialogResult ShowMessage(IWin32Window owner, string text, string caption, MessageBoxButtons buttons, MessageBoxIcon icon)
+        {
+            return MessageBox.Show(owner, text, caption, buttons, icon);
+        }
+
+        public AutoExtractPreviewResult ShowAutoExtractPreview(IWin32Window owner, IList<ExtractionCandidate> candidates)
+        {
+            using (var preview = new AutoExtractPreviewForm(candidates))
+            {
+                var dialogResult = preview.ShowDialog(owner);
+                return new AutoExtractPreviewResult
+                {
+                    DialogResult = dialogResult,
+                    SelectedCandidates = preview.SelectedCandidates == null
+                        ? new List<ExtractionCandidate>()
+                        : preview.SelectedCandidates.ToList(),
+                };
+            }
+        }
+    }
+}