Reuse open Explorer window when selecting files

MainWindowViewModel.cs

@@ -4,6 +4,7 @@ using System.Collections.ObjectModel;
 using System.ComponentModel;
 using System.IO;
 using System.Linq;
+using System.Runtime.InteropServices;
 using System.Runtime.CompilerServices;
 using System.Text;
 using System.Text.RegularExpressions;
@@ -33,6 +34,19 @@ namespace DrillTools
         private bool _isStartupDrillTapeFile;
         private bool _canGeneratePpDrillTape;
 
+        private const int SwRestore = 9;
+        private const int SvsiSelect = 0x1;
+        private const int SvsiDeselectOthers = 0x4;
+        private const int SvsiEnsureVisible = 0x8;
+        private const int SvsiFocused = 0x10;
+        private const int SelectFileFlags = SvsiSelect | SvsiDeselectOthers | SvsiEnsureVisible | SvsiFocused;
+
+        [DllImport("user32.dll")]
+        private static extern bool SetForegroundWindow(IntPtr hWnd);
+
+        [DllImport("user32.dll")]
+        private static extern bool ShowWindow(IntPtr hWnd, int nCmdShow);
+
         /// <summary>
         /// 刀具列表
         /// </summary>
@@ -1223,15 +1237,11 @@ M30";
                     return;
                 }
 
-                // 使用 explorer.exe 的 /select 参数来打开文件资源管理器并选中文件
-                ProcessStartInfo startInfo = new ProcessStartInfo
-                {
-                    FileName = "explorer.exe",
-                    Arguments = $"/select,\"{filePath}\"",
-                    UseShellExecute = true
-                };
+                string fullFilePath = Path.GetFullPath(filePath);
+                if (TrySelectFileInOpenExplorerWindow(fullFilePath))
+                    return;
 
-                Process.Start(startInfo);
+                OpenNewExplorerWindowAndSelectFile(fullFilePath);
             }
             catch (Exception ex)
             {
@@ -1239,6 +1249,138 @@ M30";
             }
         }
 
+        private static bool TrySelectFileInOpenExplorerWindow(string filePath)
+        {
+            string? directory = Path.GetDirectoryName(filePath);
+            if (string.IsNullOrWhiteSpace(directory))
+                return false;
+
+            string normalizedDirectory = NormalizeDirectoryPath(directory);
+            Type? shellType = Type.GetTypeFromProgID("Shell.Application");
+            if (shellType == null)
+                return false;
+
+            object? shell = null;
+            try
+            {
+                shell = Activator.CreateInstance(shellType);
+                if (shell == null)
+                    return false;
+
+                dynamic shellApplication = shell;
+                foreach (dynamic window in shellApplication.Windows())
+                {
+                    if (!IsExplorerWindow(window))
+                        continue;
+
+                    string? windowDirectory = GetExplorerWindowDirectory(window);
+                    if (string.IsNullOrWhiteSpace(windowDirectory)
+                        || !string.Equals(NormalizeDirectoryPath(windowDirectory), normalizedDirectory, StringComparison.OrdinalIgnoreCase))
+                    {
+                        continue;
+                    }
+
+                    if (SelectFileInExplorerWindow(window, filePath))
+                        return true;
+                }
+            }
+            catch
+            {
+                return false;
+            }
+            finally
+            {
+                if (shell != null && Marshal.IsComObject(shell))
+                    Marshal.FinalReleaseComObject(shell);
+            }
+
+            return false;
+        }
+
+        private static bool IsExplorerWindow(dynamic window)
+        {
+            try
+            {
+                string fullName = Convert.ToString(window.FullName) ?? string.Empty;
+                return string.Equals(Path.GetFileName(fullName), "explorer.exe", StringComparison.OrdinalIgnoreCase);
+            }
+            catch
+            {
+                return false;
+            }
+        }
+
+        private static string? GetExplorerWindowDirectory(dynamic window)
+        {
+            try
+            {
+                string path = Convert.ToString(window.Document.Folder.Self.Path) ?? string.Empty;
+                if (!string.IsNullOrWhiteSpace(path))
+                    return path;
+            }
+            catch
+            {
+                // 回退到 LocationURL，兼容部分 Explorer 窗口取不到 Folder.Self.Path 的情况。
+            }
+
+            try
+            {
+                string locationUrl = Convert.ToString(window.LocationURL) ?? string.Empty;
+                if (Uri.TryCreate(locationUrl, UriKind.Absolute, out Uri? uri) && uri.IsFile)
+                    return uri.LocalPath;
+            }
+            catch
+            {
+                return null;
+            }
+
+            return null;
+        }
+
+        private static bool SelectFileInExplorerWindow(dynamic window, string filePath)
+        {
+            try
+            {
+                dynamic document = window.Document;
+                dynamic fileItem = document.Folder.ParseName(Path.GetFileName(filePath));
+                if (fileItem == null)
+                {
+                    document.Refresh();
+                    fileItem = document.Folder.ParseName(Path.GetFileName(filePath));
+                }
+
+                if (fileItem == null)
+                    return false;
+
+                document.SelectItem(fileItem, SelectFileFlags);
+                IntPtr handle = new IntPtr(Convert.ToInt64(window.HWND));
+                ShowWindow(handle, SwRestore);
+                SetForegroundWindow(handle);
+                return true;
+            }
+            catch
+            {
+                return false;
+            }
+        }
+
+        private static string NormalizeDirectoryPath(string path)
+        {
+            return Path.GetFullPath(path).TrimEnd(Path.DirectorySeparatorChar, Path.AltDirectorySeparatorChar);
+        }
+
+        private static void OpenNewExplorerWindowAndSelectFile(string filePath)
+        {
+            ProcessStartInfo startInfo = new ProcessStartInfo
+            {
+                FileName = "explorer.exe",
+                Arguments = $"/select,\"{filePath}\"",
+                UseShellExecute = true
+            };
+
+            Process.Start(startInfo);
+        }
+
         /// <summary>
         /// 生成刀具直径列表文件
         /// </summary>