public string GetPath()
{
Trace.Entering();
var infos = new List<PowerShellInfo>();
// Get all generation subkeys.
string[] generations;
using (RegistryKey powerShellKey = Registry.LocalMachine.OpenSubKey(@"SOFTWARE\Microsoft\PowerShell"))
{
generations =
(powerShellKey?.GetSubKeyNames() ?? new string[0])
// Filter out non-integers.
.Where(x =>
{
Trace.Verbose($"Candidate generation: '{x}'");
int generationInt;
return int.TryParse(x, NumberStyles.None, NumberFormatInfo.InvariantInfo, out generationInt);
})
.ToArray();
}
foreach (string generation in generations)
{
// Create a new generation info data class.
Trace.Info($"Generation: '{generation}'");
var info = new PowerShellInfo();
// Check the install flag.
object install = GetHklmValue($@"SOFTWARE\Microsoft\PowerShell\{generation}", "Install");
if (object.ReferenceEquals(install, null) ||
install.GetType() != typeof(int) ||
(int)install != 1)
{
Trace.Info("Not installed.");
continue;
}
// Get the engine version.
string versionString = GetHklmValue($@"SOFTWARE\Microsoft\PowerShell\{generation}\PowerShellEngine", "PowerShellVersion") as string;
if (string.IsNullOrEmpty(versionString) ||
!Version.TryParse(versionString, out info.Version))
{
Trace.Info("Unable to determine engine version.");
continue;
}
// Check the minimum version.
if (info.Version < MinimumVersion)
{
Trace.Info("Unsupported version. Skipping.");
continue;
}
// Get the console host directory.
string applicationBase = GetHklmValue($@"SOFTWARE\Microsoft\PowerShell\{generation}\PowerShellEngine", "ApplicationBase") as string;
if (string.IsNullOrEmpty(applicationBase))
{
Trace.Warning("Unable to locate application base. Skipping.");
continue;
}
// Check the file path.
info.Path = Path.Combine(applicationBase, "powershell.exe");
if (!File.Exists(info.Path))
{
Trace.Warning($"Console host does not exist at expected location: '{info.Path}'");
continue;
}
ArgUtil.NotNullOrEmpty(info.Path, nameof(info.Path));
ArgUtil.NotNull(info.Version, nameof(info.Version));
infos.Add(info);
}
// Throw if not found.
PowerShellInfo latest = infos.OrderByDescending(x => x.Version).FirstOrDefault();
if (latest == null)
{
throw new Exception(StringUtil.Loc("PowerShellNotInstalledMinVersion0", MinimumVersion));
}
return latest.Path;
}
public string GetPath()
{
Trace.Entering();
var infos = new List <PowerShellInfo>();
// Get all generation subkeys.
string[] generations;
using (RegistryKey powerShellKey = Registry.LocalMachine.OpenSubKey(@"SOFTWARE\Microsoft\PowerShell"))
{
generations =
(powerShellKey?.GetSubKeyNames() ?? new string[0])
// Filter out non-integers.
.Where(x =>
{
Trace.Verbose($"Candidate generation: '{x}'");
int generationInt;
return(int.TryParse(x, NumberStyles.None, NumberFormatInfo.InvariantInfo, out generationInt));
})
.ToArray();
}
foreach (string generation in generations)
{
// Create a new generation info data class.
Trace.Info($"Generation: '{generation}'");
var info = new PowerShellInfo();
// Get the engine version.
string versionString = GetHklmValue($@"SOFTWARE\Microsoft\PowerShell\{generation}\PowerShellEngine", "PowerShellVersion") as string;
if (string.IsNullOrEmpty(versionString) ||
!Version.TryParse(versionString, out info.Version))
{
Trace.Info("Unable to determine the Powershell engine version. Possibly Powershell is not installed.");
continue;
}
// Check the minimum version.
if (info.Version < MinimumVersion)
{
Trace.Info("Unsupported version. Skipping.");
continue;
}
// Get the console host directory.
string applicationBase = GetHklmValue($@"SOFTWARE\Microsoft\PowerShell\{generation}\PowerShellEngine", "ApplicationBase") as string;
if (string.IsNullOrEmpty(applicationBase))
{
Trace.Warning("Unable to locate application base. Skipping.");
continue;
}
// Check the file path.
info.Path = Path.Combine(applicationBase, "powershell.exe");
if (!File.Exists(info.Path))
{
Trace.Warning($"Console host does not exist at expected location: '{info.Path}'");
continue;
}
ArgUtil.NotNullOrEmpty(info.Path, nameof(info.Path));
ArgUtil.NotNull(info.Version, nameof(info.Version));
infos.Add(info);
}
// Throw if not found.
PowerShellInfo latest = infos.OrderByDescending(x => x.Version).FirstOrDefault();
if (latest == null)
{
throw new Exception(StringUtil.Loc("PowerShellNotInstalledMinVersion0", MinimumVersion));
}
return(latest.Path);
}