Added a pre-selection functionality.

Author: mikependon

WPF/TreeViewFileExplorer/TreeViewFileExplorer/MainWindow.xaml.cs

@@ -1,4 +1,5 @@
-using System.IO;
+using System;
+using System.IO;
 using System.Linq;
 using System.Windows;
 using System.Windows.Input;
@@ -17,26 +18,102 @@ public MainWindow()
             InitializeFileSystemObjects();
         }
 
+        #region Events
+
+        private void FileSystemObject_AfterExplore(object sender, System.EventArgs e)
+        {
+            Cursor = Cursors.Arrow;
+        }
+
+        private void FileSystemObject_BeforeExplore(object sender, System.EventArgs e)
+        {
+            Cursor = Cursors.Wait;
+        }
+
+        #endregion
+
+        #region Methods
+
         private void InitializeFileSystemObjects()
         {
             var drives = DriveInfo.GetDrives();
-            DriveInfo.GetDrives().ToList().ForEach(drive =>
+            DriveInfo
+                .GetDrives()
+                .ToList()
+                .ForEach(drive =>
+                {
+                    var fileSystemObject = new FileSystemObjectInfo(drive);
+                    fileSystemObject.BeforeExplore += FileSystemObject_BeforeExplore;
+                    fileSystemObject.AfterExplore += FileSystemObject_AfterExplore;
+                    treeView.Items.Add(fileSystemObject);
+                });
+            PreSelect(Environment.GetFolderPath(Environment.SpecialFolder.Desktop));
+        }
+
+        private void PreSelect(string path)
+        {
+            if (!Directory.Exists(path))
             {
-                var fileSystemObject = new FileSystemObjectInfo(drive);
-                fileSystemObject.BeforeExplore += FileSystemObject_BeforeExplore;
-                fileSystemObject.AfterExplore += FileSystemObject_AfterExplore;
-                treeView.Items.Add(fileSystemObject);
-            });
+                return;
+            }
+            var driveFileSystemObjectInfo = GetDriveFileSystemObjectInfo(path);
+            driveFileSystemObjectInfo.IsExpanded = true;
+            PreSelect(driveFileSystemObjectInfo, path);
         }
 
-        private void FileSystemObject_AfterExplore(object sender, System.EventArgs e)
+        private void PreSelect(FileSystemObjectInfo fileSystemObjectInfo,
+            string path)
         {
-            Cursor = Cursors.Arrow;
+            foreach (var childFileSystemObjectInfo in fileSystemObjectInfo.Children)
+            {
+                var isParentPath = IsParentPath(path, childFileSystemObjectInfo.FileSystemInfo.FullName);
+                if (isParentPath)
+                {
+                    if (string.Equals(childFileSystemObjectInfo.FileSystemInfo.FullName, path))
+                    {
+                        /* We found the item for pre-selection */
+                    }
+                    else
+                    {
+                        childFileSystemObjectInfo.IsExpanded = true;
+                        PreSelect(childFileSystemObjectInfo, path);
+                    }
+                }
+            }
         }
 
-        private void FileSystemObject_BeforeExplore(object sender, System.EventArgs e)
+        #endregion
+
+        #region Helpers
+
+        private FileSystemObjectInfo GetDriveFileSystemObjectInfo(string path)
         {
-            Cursor = Cursors.Wait;
+            var directory = new DirectoryInfo(path);
+            var drive = DriveInfo
+                .GetDrives()
+                .Where(d => d.RootDirectory.FullName == directory.Root.FullName)
+                .FirstOrDefault();
+            return GetDriveFileSystemObjectInfo(drive);
         }
+
+        private FileSystemObjectInfo GetDriveFileSystemObjectInfo(DriveInfo drive)
+        {
+            foreach (var fso in treeView.Items.OfType<FileSystemObjectInfo>())
+            {
+                if (fso.FileSystemInfo.FullName == drive.RootDirectory.FullName)
+                {
+                    return fso;
+                }
+            }
+            return null;
+        }
+
+        private bool IsParentPath(string path,
+            string targetPath)
+        {
+            return path.StartsWith(targetPath);
+        }
+
+        #endregion
     }
 }

WPF/TreeViewFileExplorer/TreeViewFileExplorer/bin/Debug/TreeViewFileExplorer.exe

@@ -1,4 +1,4 @@
-#pragma checksum "..\..\App.xaml" "{ff1816ec-aa5e-4d10-87f7-6f4963833460}" "2C9C1DD8388E9E2A086C90D03FBA8DAB005E90E0"
+#pragma checksum "..\..\App.xaml" "{8829d00f-11b8-4213-878b-770e8597ac16}" "6513D88DE627D2BE30832AB5B221A247CB9C06235F292553A6D0CB9D1A3E1DDE"
 //------------------------------------------------------------------------------
 // <auto-generated>
 //     This code was generated by a tool.

WPF/TreeViewFileExplorer/TreeViewFileExplorer/bin/Debug/TreeViewFileExplorer.pdb

@@ -1,4 +1,4 @@
-#pragma checksum "..\..\App.xaml" "{ff1816ec-aa5e-4d10-87f7-6f4963833460}" "2C9C1DD8388E9E2A086C90D03FBA8DAB005E90E0"
+#pragma checksum "..\..\App.xaml" "{8829d00f-11b8-4213-878b-770e8597ac16}" "6513D88DE627D2BE30832AB5B221A247CB9C06235F292553A6D0CB9D1A3E1DDE"
 //------------------------------------------------------------------------------
 // <auto-generated>
 //     This code was generated by a tool.

WPF/TreeViewFileExplorer/TreeViewFileExplorer/obj/Debug/App.g.cs

@@ -1,4 +1,4 @@
-#pragma checksum "..\..\MainWindow.xaml" "{ff1816ec-aa5e-4d10-87f7-6f4963833460}" "047D3C8B72BD13739C89617D9B6797681B2B7F84"
+#pragma checksum "..\..\MainWindow.xaml" "{8829d00f-11b8-4213-878b-770e8597ac16}" "10F0F0C95B270C5F08F2BE7C4F5EF66E48EBE1E67AC956725ADDDC6CD75DDCDB"
 //------------------------------------------------------------------------------
 // <auto-generated>
 //     This code was generated by a tool.

WPF/TreeViewFileExplorer/TreeViewFileExplorer/obj/Debug/App.g.i.cs

@@ -1,4 +1,4 @@
-#pragma checksum "..\..\MainWindow.xaml" "{ff1816ec-aa5e-4d10-87f7-6f4963833460}" "047D3C8B72BD13739C89617D9B6797681B2B7F84"
+#pragma checksum "..\..\MainWindow.xaml" "{8829d00f-11b8-4213-878b-770e8597ac16}" "10F0F0C95B270C5F08F2BE7C4F5EF66E48EBE1E67AC956725ADDDC6CD75DDCDB"
 //------------------------------------------------------------------------------
 // <auto-generated>
 //     This code was generated by a tool.

WPF/TreeViewFileExplorer/TreeViewFileExplorer/obj/Debug/MainWindow.g.cs

@@ -1 +1 @@
-6b8de9424a0554c7fbb77eba3fda67a3061c4505
+7c3810b2afb66e5c1fc2a46b930b1762e1367b43

WPF/TreeViewFileExplorer/TreeViewFileExplorer/obj/Debug/MainWindow.g.i.cs

@@ -14,3 +14,19 @@ C:\Users\MichaelP\Source\Repos\TreeViewFileExplorer\TreeViewFileExplorer\obj\Deb
 C:\Users\MichaelP\Source\Repos\TreeViewFileExplorer\TreeViewFileExplorer\obj\Debug\TreeViewFileExplorer.pdb
 C:\Users\MichaelP\Source\Repos\TreeViewFileExplorer\TreeViewFileExplorer\obj\Debug\GeneratedInternalTypeHelper.g.cs
 C:\Users\MichaelP\Source\Repos\TreeViewFileExplorer\TreeViewFileExplorer\obj\Debug\TreeViewFileExplorer.csprojAssemblyReference.cache
+C:\Users\MichaelP\Source\Repos\GitHub\Tutorials\WPF\TreeViewFileExplorer\TreeViewFileExplorer\bin\Debug\TreeViewFileExplorer.exe.config
+C:\Users\MichaelP\Source\Repos\GitHub\Tutorials\WPF\TreeViewFileExplorer\TreeViewFileExplorer\bin\Debug\TreeViewFileExplorer.exe
+C:\Users\MichaelP\Source\Repos\GitHub\Tutorials\WPF\TreeViewFileExplorer\TreeViewFileExplorer\bin\Debug\TreeViewFileExplorer.pdb
+C:\Users\MichaelP\Source\Repos\GitHub\Tutorials\WPF\TreeViewFileExplorer\TreeViewFileExplorer\obj\Debug\TreeViewFileExplorer.csprojAssemblyReference.cache
+C:\Users\MichaelP\Source\Repos\GitHub\Tutorials\WPF\TreeViewFileExplorer\TreeViewFileExplorer\obj\Debug\MainWindow.g.cs
+C:\Users\MichaelP\Source\Repos\GitHub\Tutorials\WPF\TreeViewFileExplorer\TreeViewFileExplorer\obj\Debug\App.g.cs
+C:\Users\MichaelP\Source\Repos\GitHub\Tutorials\WPF\TreeViewFileExplorer\TreeViewFileExplorer\obj\Debug\GeneratedInternalTypeHelper.g.cs
+C:\Users\MichaelP\Source\Repos\GitHub\Tutorials\WPF\TreeViewFileExplorer\TreeViewFileExplorer\obj\Debug\TreeViewFileExplorer_MarkupCompile.cache
+C:\Users\MichaelP\Source\Repos\GitHub\Tutorials\WPF\TreeViewFileExplorer\TreeViewFileExplorer\obj\Debug\TreeViewFileExplorer_MarkupCompile.lref
+C:\Users\MichaelP\Source\Repos\GitHub\Tutorials\WPF\TreeViewFileExplorer\TreeViewFileExplorer\obj\Debug\MainWindow.baml
+C:\Users\MichaelP\Source\Repos\GitHub\Tutorials\WPF\TreeViewFileExplorer\TreeViewFileExplorer\obj\Debug\TreeViewFileExplorer.g.resources
+C:\Users\MichaelP\Source\Repos\GitHub\Tutorials\WPF\TreeViewFileExplorer\TreeViewFileExplorer\obj\Debug\TreeViewFileExplorer.Properties.Resources.resources
+C:\Users\MichaelP\Source\Repos\GitHub\Tutorials\WPF\TreeViewFileExplorer\TreeViewFileExplorer\obj\Debug\TreeViewFileExplorer.csproj.GenerateResource.cache
+C:\Users\MichaelP\Source\Repos\GitHub\Tutorials\WPF\TreeViewFileExplorer\TreeViewFileExplorer\obj\Debug\TreeViewFileExplorer.csproj.CoreCompileInputs.cache
+C:\Users\MichaelP\Source\Repos\GitHub\Tutorials\WPF\TreeViewFileExplorer\TreeViewFileExplorer\obj\Debug\TreeViewFileExplorer.exe
+C:\Users\MichaelP\Source\Repos\GitHub\Tutorials\WPF\TreeViewFileExplorer\TreeViewFileExplorer\obj\Debug\TreeViewFileExplorer.pdb

WPF/TreeViewFileExplorer/TreeViewFileExplorer/obj/Debug/TreeViewFileExplorer.csproj.CoreCompileInputs.cache

@@ -4,12 +4,12 @@
 winexe
 C#
 .cs
-C:\Users\MichaelP\Source\Repos\TreeViewFileExplorer\TreeViewFileExplorer\obj\Debug\
+C:\Users\MichaelP\Source\Repos\GitHub\Tutorials\WPF\TreeViewFileExplorer\TreeViewFileExplorer\obj\Debug\
 TreeViewFileExplorer
 none
 false
 DEBUG;TRACE
-C:\Users\MichaelP\Source\Repos\TreeViewFileExplorer\TreeViewFileExplorer\App.xaml
+C:\Users\MichaelP\Source\Repos\GitHub\Tutorials\WPF\TreeViewFileExplorer\TreeViewFileExplorer\App.xaml
 11151548125
 
 19-586021596

WPF/TreeViewFileExplorer/TreeViewFileExplorer/obj/Debug/TreeViewFileExplorer.csproj.FileListAbsolute.txt

@@ -1,4 +1,4 @@
 
 
-FC:\Users\MichaelP\Source\Repos\TreeViewFileExplorer\TreeViewFileExplorer\MainWindow.xaml;;
+FC:\Users\MichaelP\Source\Repos\GitHub\Tutorials\WPF\TreeViewFileExplorer\TreeViewFileExplorer\MainWindow.xaml;;