PeterHarding: Created page with " The Browser Folder Dialog in ASP.NET 1.1 allows you to select a folder. There is a property, RootFolder, that allows you to select what folder is the root in the dialog. Th..."

2021-10-16T19:39:17Z

Created page with " The Browser Folder Dialog in ASP.NET 1.1 allows you to select a folder. There is a property, RootFolder, that allows you to select what folder is the root in the dialog. Th..."

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The Browser Folder Dialog in ASP.NET 1.1 allows you to select a folder. There is a property, RootFolder, that allows you to select what folder is the root in the dialog. The RootFolder property can be set to any of the values in the System.Environment.SpecialFolder enum in the .NET Framework. However, there may be settings that are not in that enumeration that you may want to use. For example, you may want to set the root to be My Network Places.

It turns out that the Browse Folder Dialog is a cover for a Windows API call. The Windows API call takes a parameter that is a constant that indicates what the root should be. For some reason the allowed constants in Windows were not fully implemented in the System.Environment.SpecialFolder enum (for no good reason that I can figure out).

You can't just set the RootFolder property to the values in the constants provided by Windows. Instead you will have to pull a trick using Reflection to modify the internally stored number in a private variable inside the dialog.

Include the following class in your project:

[c#]
<pre>
using System;
using System.Reflection;

public sealed class FolderBrowserDialogEx
{
[Flags()]
public enum CsIdl
{
Desktop = 0x0000, // Desktop
Internet = 0x0001, // Internet Explorer (icon on desktop)
Programs = 0x0002, // Start Menu\Programs
Controls = 0x0003, // My Computer\Control Panel
Printers = 0x0004, // My Computer\Printers
Personal = 0x0005, // My Documents
Favorites = 0x0006, // user name\Favorites
Startup = 0x0007, // Start Menu\Programs\Startup
Recent = 0x0008, // user name\Recent
SendTo = 0x0009, // user name\SendTo
BitBucket = 0x000a, // desktop\Recycle Bin
StartMenu = 0x000b, // user name\Start Menu
MyDocuments = 0x000c, // logical "My Documents" desktop icon
MyMusic = 0x000d, // "My Music" folder
MyVideo = 0x000e, // "My Videos" folder
DesktopDirectory = 0x0010, // user name\Desktop
Drives = 0x0011, // My Computer
Network = 0x0012, // Network Neighborhood (My Network Places)
Nethood = 0x0013, // user name\nethood
Fonts = 0x0014, // windows\fonts
Templates = 0x0015,
CommonStartMenu = 0x0016, // All Users\Start Menu
CommonPrograms = 0x0017, // All Users\Start Menu\Programs
CommonStartup = 0x0018, // All Users\Startup
CommonDesktopDirectory = 0x0019, // All Users\Desktop
AppData = 0x001a, // user name\Application Data
PrintHood = 0x001b, // user name\PrintHood
LocalAppData = 0x001c, // user name\Local Settings\Applicaton Data (non roaming)
AltStartup = 0x001d, // non localized startup
CommonAltStartup = 0x001e, // non localized common startup
CommonFavorites = 0x001f,
InternetCache = 0x0020,
Cookies = 0x0021,
History = 0x0022,
CommonAppdata = 0x0023, // All Users\Application Data
Windows = 0x0024, // GetWindowsDirectory()
System = 0x0025, // GetSystemDirectory()
ProgramFiles = 0x0026, // C:\Program Files
MyPictures = 0x0027, // C:\Program Files\My Pictures
Profile = 0x0028, // USERPROFILE
SystemX86 = 0x0029, // x86 system directory on RISC
ProgramFilesX86 = 0x002a, // x86 C:\Program Files on RISC
ProgramFilesCommon = 0x002b, // C:\Program Files\Common
ProgramFilesCommonx86 = 0x002c, // x86 Program Files\Common on RISC
CommonTemplates = 0x002d, // All Users\Templates
CommonDocuments = 0x002e, // All Users\Documents
CommonAdminTools = 0x002f, // All Users\Start Menu\Programs\Administrative Tools
AdminTools = 0x0030, // user name\Start Menu\Programs\Administrative Tools
Connections = 0x0031, // Network and Dial-up Connections
CommonMusic = 0x0035, // All Users\My Music
CommonPictures = 0x0036, // All Users\My Pictures
CommonVideo = 0x0037, // All Users\My Video
Resources = 0x0038, // Resource Directory
ResourcesLocalized = 0x0039, // Localized Resource Directory
CommonOemLinks = 0x003a, // Links to All Users OEM specific apps
CdBurnArea = 0x003b, // USERPROFILE\Local Settings\Application Data\Microsoft\CD Burning
ComputersNearMe = 0x003d, // Computers Near Me (determined from Workgroup membership)
FlagCreate = 0x8000, // combine with CSIDL_ value to force folder creation in SHGetFolderPath()
FlagDontVerify = 0x4000, // combine with CSIDL_ value to return an unverified folder path
FlagNoAlias = 0x1000, // combine with CSIDL_ value to insure non-alias versions of the pidl
FlagPerUserInit = 0x0800, // combine with CSIDL_ value to indicate per-user init (eg. upgrade)
FlagMask = 0xFF00, // mask for all possible flag values
}

private FolderBrowserDialogEx()
{
}

public static void SetRootFolder(System.Windows.Forms.FolderBrowserDialog fbd, CsIdl csidl)
{
Type t = fbd.GetType();
FieldInfo fi = t.GetField("rootFolder", BindingFlags.Instance | BindingFlags.NonPublic);
fi.SetValue(fbd, (System.Environment.SpecialFolder) csidl);
}
}
</pre>

To set the FolderRoot property, call it like this:

[c#]

FolderBrowserDialogEx.SetRootFolder(fbd, FolderBrowserDialogEx.CsIdl.Network);

Where fbd is the name of the FolderBrowserDialog on your form, and the second argument is what you want to use as the root of the dialog.

C-Sharp - FolderDialog Issues - Revision history

PeterHarding: Created page with " The Browser Folder Dialog in ASP.NET 1.1 allows you to select a folder. There is a property, RootFolder, that allows you to select what folder is the root in the dialog. Th..."