public ObservablePropertyFactory <TObject, TProperty> GetFactory <TObject, TProperty>(Expression <Func <TObject, TProperty> > expression)
where TObject : INotifyPropertyChanged
{
var key = expression.ToCacheKey();
var result = _factories.GetOrAdd(key, k =>
{
ObservablePropertyFactory <TObject, TProperty> factory;
var memberChain = expression.GetMemberChain().ToArray();
if (memberChain.Length == 1)
{
factory = new ObservablePropertyFactory <TObject, TProperty>(expression);
}
else
{
var chain = memberChain.Select(m => new ObservablePropertyPart(m)).ToArray();
var accessor = expression?.Compile() ?? throw new ArgumentNullException(nameof(expression));
factory = new ObservablePropertyFactory <TObject, TProperty>(accessor, chain);
}
return(factory);
});
return((ObservablePropertyFactory <TObject, TProperty>)result);
}
public ObservablePropertyFactory <TObject, TProperty> GetFactory <TObject, TProperty>(Expression <Func <TObject, TProperty> > expression)
where TObject : INotifyPropertyChanged
{
var key = expression.ToCacheKey();
// ReSharper disable once InconsistentlySynchronizedField
var exiting = _factories.Lookup(key);
if (exiting.HasValue)
{
return((ObservablePropertyFactory <TObject, TProperty>)exiting.Value);
}
lock (_locker)
{
if (_factories.ContainsKey(key))
{
return((ObservablePropertyFactory <TObject, TProperty>)_factories[key]);
}
ObservablePropertyFactory <TObject, TProperty> factory;
var memberChain = expression.GetMemberChain().ToArray();
if (memberChain.Length == 1)
{
factory = new ObservablePropertyFactory <TObject, TProperty>(expression);
}
else
{
var chain = memberChain.Select(m => new ObservablePropertyPart(m)).ToArray();
var accessor = expression?.Compile() ?? throw new ArgumentNullException(nameof(expression));
factory = new ObservablePropertyFactory <TObject, TProperty>(accessor, chain);
}
_factories[key] = factory;
return(factory);
}
}
