<PackageReference Include="System.Configuration.ConfigurationManager" Version="5.0.0-preview.1.20120.5" />

ValidatorCallback

public sealed delegate ValidatorCallback : MulticastDelegate
Represents a method to be called after the validation of an object.
namespace System.Configuration { public delegate void ValidatorCallback (object value); } namespace System.Configuration { public class SettingChangingEventArgs : CancelEventArgs { private readonly string _settingClass; private readonly string _settingName; private readonly string _settingKey; private readonly object _newValue; public object NewValue { get { return _newValue; } } public string SettingClass { get { return _settingClass; } } public string SettingName { get { return _settingName; } } public string SettingKey { get { return _settingKey; } } public SettingChangingEventArgs(string settingName, string settingClass, string settingKey, object newValue, bool cancel) { base..ctor(cancel); _settingName = settingName; _settingClass = settingClass; _settingKey = settingKey; _newValue = newValue; } } }