RevitInstallationLocation

Program.cs

#pragma warning disable CA1416

using Microsoft.Win32;

var revitVersion = "2020";
var revitPath = GetRevitPath(revitVersion);
Console.WriteLine($"Revit Path for {revitVersion} is {revitPath}");


string? GetRevitPath(string version)
{
    try
    {
        string baseKeyPath = $"SOFTWARE\\Autodesk\\Revit\\{version}";
        using (var localMachine = RegistryKey.OpenBaseKey(RegistryHive.LocalMachine, RegistryView.Registry64))
        using (var rootKey = localMachine.OpenSubKey(baseKeyPath))
        {
            if (rootKey == null)
            {
                Console.WriteLine($"Registry path not found: {baseKeyPath}");
                return null;
            }

            return FindInstallationPathRecursive(rootKey);
        }
    }
    catch (Exception ex)
    {
        Console.WriteLine($"Error while trying to get Revit {version} path: {ex.Message}");
        return null;
    }
}

string? FindInstallationPathRecursive(RegistryKey key)
{
    try
    {
        var installPath = key.GetValue("InstallationLocation") as string;
        if (!string.IsNullOrEmpty(installPath))
        {
            var revitExePath = Path.Combine(installPath, "Revit.exe");
            if (File.Exists(revitExePath))
                return revitExePath;
        }

        foreach (var subKeyName in key.GetSubKeyNames())
        {
            using (var subKey = key.OpenSubKey(subKeyName))
            {
                if (subKey == null)
                    continue;

                var result = FindInstallationPathRecursive(subKey);
                if (!string.IsNullOrEmpty(result))
                    return result;
            }
        }

        return null;
    }
    catch (Exception ex)
    {
        Console.WriteLine($"Error while searching registry: {ex.Message}");
        return null;
    }
}