Registry

Use class Registry. See also saving variables.

Set a string value.

Registry.SetValue(@"HKEY_CURRENT_USER\SOFTWARE\Au\Test", "A", "text");

Get a string value if exists.

if (Registry.GetValue(@"HKEY_CURRENT_USER\SOFTWARE\Au\Test", "A", null) is string s1) {
	print.it(s1);
}

Set a DWORD value.

int i1 = 100;
Registry.SetValue(@"HKEY_CURRENT_USER\SOFTWARE\Au\Test", "B", i1);

Get a DWORD value if exists.

if (Registry.GetValue(@"HKEY_CURRENT_USER\SOFTWARE\Au\Test", "B", null) is int i2) {
	print.it(i2);
}

Delete a value if exists.

using (var k1 = Registry.CurrentUser.OpenSubKey(@"SOFTWARE\Au\Test", writable: true)) k1.DeleteValue("A", throwOnMissingValue: false);

Enumerate subkeys.

using (var k1 = Registry.CurrentUser.OpenSubKey(@"SOFTWARE\Microsoft")) {
	foreach (var s2 in k1.GetSubKeyNames()) {
		print.it(s2);
	}
}