public PropertyChangeWatcher AddWatcher(IList <string> propertyNames, Action handler)
{
Contract.Requires(handler != null);
Contract.Requires(propertyNames != null);
Contract.Requires(propertyNames.Count > 0);
Contract.Requires(propertyNames.AllUnique());
BotUtil.ThrowUnless(propertyNames.All(name => OwnerType.HasPublicInstanceProperty(name)), "The target object does not contain one or more of the properties provided");
lock (_handlers)
{
foreach (var key in propertyNames)
{
BotUtil.ThrowUnless <ArgumentException>(!IsWatching(key), "Must not already be watching property '{0}'".StringFormat(key));
}
if (_handlers.Count == 0)
{
_owner.PropertyChanged += _owner_PropertyChanged;
}
foreach (var propertyName in propertyNames)
{
_handlers[propertyName] = handler;
}
return(this);
}
}
public void StopWatching(string property)
{
lock (_handlers)
{
BotUtil.ThrowUnless(IsWatching(property));
_handlers.Remove(property);
if (_handlers.Count == 0)
{
_owner.PropertyChanged -= _owner_PropertyChanged;
}
}
}
public static void Requires <TException>(bool truth, string message) where TException : Exception
{
BotUtil.ThrowUnless <TException>(truth, message);
}
public static void Requires <TException>(bool truth) where TException : Exception, new()
{
BotUtil.ThrowUnless <TException>(truth);
}
public static void Requires(bool truth, string message = null)
{
BotUtil.ThrowUnless(truth, message);
}