Determine User OneDrive Folders Without The Microsoft.OneDriveSDK

David Mccarter
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Recently while working on my dotNetTips.Utility Dev App , I realized I was determining the location of the user's OneDrive folder wrong, especially if they have more than one OneDrive account, like myself. I didn't want to go through the hassle of learning the Microsoft.OneDriveSDK, nor did I want to use an entire SDK just to figure this out.

Recently while looking at the Windows Registration Database, I noticed that OneDrive stores this information there. After figuring out the differences between in the info stored for personal and business accounts, I came up with a method to retrieve this info for me. Here is what it looks like.

/// <summary>
/// Loads the one drive folders.
/// </summary>
/// <returns>IEnumerable<OneDriveFolder>.</returns>
public static IEnumerable < OneDriveFolder > LoadOneDriveFolders() {
const string DisplayNameKey = "DisplayName";
const string UserFolderKey = "UserFolder";
const string AccountsKey = "Accounts";
const string EmailKey = "UserEmail";
var folders = new List < OneDriveFolder > ();
var oneDriveKey = RegistryHelper.GetCurrentUserRegistryKey(RegistryHelper.KeyCurrentUserOneDrive);
if (oneDriveKey.IsNotNull()) {
//Get Accounts
var accountKey = oneDriveKey.GetSubKey(AccountsKey);
if (accountKey.IsNotNull() && accountKey.SubKeyCount > 0) {
foreach(var subKeyName in accountKey.GetSubKeyNames()) {
var key = accountKey.GetSubKey(subKeyName);
var folder = new OneDriveFolder();
var directoryValue = key.GetValue < string > (UserFolderKey);
if (directoryValue.HasValue()) {
folder.DirectoryInfo = new DirectoryInfo(directoryValue);
var emailValue = key.GetValue < string > (EmailKey);
if (emailValue.HasValue()) {
folder.UserEmail = emailValue;
}
//Figure out account type
var name = key.GetValue < string > (DisplayNameKey);
if (name.HasValue()) {
folder.AccountType = OneDriveAccountType.Business;
folder.AccountName = name;
} else {
folder.AccountName = key.GetValue < string > (string.Empty);
}
if (folder.AccountName.HasValue() && folder.UserEmail.HasValue()) {
folders.Add(folder);
}
}
}
}
}
return folders.AsEnumerable();
}

I wrote this method in .NET Standard, so I had to install the Microsoft.Win32.Registry NuGet package first. Also, you might see some methods that you might not recognize. They are all from my open-source library, that includes the full code for this method, dotNetTips.Utility.Standard on GitHub and also available via a NuGet package.

With this code my app now properly chooses the user's OneDrive folder, where it favors the first business account it finds.