/// <exception cref="System.Security.SecurityException">
/// Thrown when current user does not have the permission to access the key
/// to monitor.
/// </exception>
/// <exception cref="System.ArgumentException">
/// Thrown when the key to monitor does not exist.
/// </exception>
public RegistryWatcher(RegistryKey hive, string keyPath, string valueName)
{
Hive = hive ?? throw new ArgumentNullException(nameof(hive));
KeyPath = keyPath ?? throw new ArgumentNullException(nameof(keyPath));
ValueName = valueName ?? throw new ArgumentNullException(nameof(valueName));
if (!SupportedHives.Contains(hive))
{
throw new ArgumentException($"{hive} not supported", nameof(hive));
}
// If you set the platform of this project to x86 and run it on a 64bit
// machine, you will get the Registry Key under
// HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node when the key path is
// HKEY_LOCAL_MACHINE\SOFTWARE
KeyToMonitor = hive.OpenSubKey(keyPath, true);
if (KeyToMonitor == null)
{
throw new ArgumentException($@"The registry key {Hive.Name}\{KeyPath} does not exist");
}
if (Value == null)
{
throw new ArgumentException($@"The registry value {ValueName} does not exist in {Hive.Name}\{KeyPath}");
}
// Construct the query string.
string queryString = $@"SELECT * FROM RegistryValueChangeEvent WHERE Hive = '{Hive.Name}' AND KeyPath = '{KeyPath.Replace(@"\", @"\\")}' AND ValueName = '{ValueName}'";
Query = new EventQuery(queryString);
EventArrived += RegistryWatcher_EventArrived;
Start();
}