protected override void initialize()
{
MemberExpression memberExpression = (MemberExpression)_propertyExpression.Body;
PropertyInfo propertyInfo = (PropertyInfo)((MemberExpression)_propertyExpression.Body).Member;
PropertyAccessors propertyAcessors;
if (!_propertyAccessors.TryGetValue(propertyInfo, out propertyAcessors))
{
ParameterExpression valueParameterExpression = Expression.Parameter(typeof(TResult));
ParameterExpression holderParameterExpression = Expression.Parameter(typeof(THolder));
var setter = Expression.Lambda <Action <THolder, TResult> >(
Expression.Assign(Expression.Property(holderParameterExpression, propertyInfo), valueParameterExpression),
holderParameterExpression, valueParameterExpression).Compile();
var getter = Expression.Lambda <Func <THolder, TResult> >(
Expression.Property(holderParameterExpression, propertyInfo),
holderParameterExpression).Compile();
propertyAcessors = new PropertyAccessors(getter, setter);
_propertyAccessors.TryAdd(propertyInfo, propertyAcessors);
}
_getter = propertyAcessors.Getter;
_setter = propertyAcessors.Setter;
_setValueAction = value =>
{
void set() => _setter(_propertyHolder, value);
if (_sourceDispatcher != null)
{
_sourceDispatcher.Invoke(set, this);
}
else if (_propertySourceDispatcher != null)
{
_propertySourceDispatcher.Invoke(set, this, false, value);
}
else
{
set();
}
};
_propertyHolder = (THolder)((ConstantExpression)memberExpression.Expression).Value;
void readAndSubscribe()
{
TResult value = getValue();
_propertyHolder.PropertyChanged += handlePropertyHolderPropertyChanged;
_destinationDispatcher.Invoke(() => setValue(value), this);
}
if (_sourceDispatcher != null)
{
_sourceDispatcher.Invoke(readAndSubscribe, this);
}
else if (_propertySourceDispatcher != null)
{
_propertySourceDispatcher.Invoke(readAndSubscribe, this, true, null);
}
else
{
readAndSubscribe();
}
}
private void initialize(Expression <Func <TResult> > propertyExpression)
{
_propertyExpression = propertyExpression;
MemberExpression memberExpression = (MemberExpression)propertyExpression.Body;
PropertyInfo propertyInfo = (PropertyInfo)((MemberExpression)propertyExpression.Body).Member;
PropertyAccessors propertyAcessors;
if (!_propertyAccessors.TryGetValue(propertyInfo, out propertyAcessors))
{
ParameterExpression valueParameterExpression = Expression.Parameter(typeof(TResult));
ParameterExpression holderParameterExpression = Expression.Parameter(typeof(THolder));
var setter = Expression.Lambda <Action <THolder, TResult> >(
Expression.Assign(Expression.Property(holderParameterExpression, propertyInfo), valueParameterExpression),
holderParameterExpression, valueParameterExpression).Compile();
var getter = Expression.Lambda <Func <THolder, TResult> >(
Expression.Property(holderParameterExpression, propertyInfo),
holderParameterExpression).Compile();
propertyAcessors = new PropertyAccessors(getter, setter);
_propertyAccessors.TryAdd(propertyInfo, propertyAcessors);
}
_getter = propertyAcessors.Getter;
_setter = propertyAcessors.Setter;
_propertyHolder = (THolder)((ConstantExpression)memberExpression.Expression).Value;
_propertyHolderPropertyChangedEventHandler = handlePropertyHolderPropertyChanged;
_propertyHolderWeakPropertyChangedEventHandler =
new WeakPropertyChangedEventHandler(_propertyHolderPropertyChangedEventHandler);
void readAndSubscribe()
{
getValue();
void raiseValuePropertyChanged()
{
PropertyChanged?.Invoke(this, Utils.ValuePropertyChangedEventArgs);
}
_propertyHolder.PropertyChanged += _propertyHolderWeakPropertyChangedEventHandler.Handle;
_destinationDispatcher.Invoke(raiseValuePropertyChanged, this);
}
if (_sourceDispatcher != null)
{
if (_sourceDispatcher != null)
{
_sourceDispatcher.Invoke(readAndSubscribe, this);
}
else
{
_propertySourceDispatcher.Invoke(readAndSubscribe, this, true, null);
}
}
else
{
readAndSubscribe();
}
if (Configuration.SaveInstantiatingStackTrace)
{
_instantiatingStackTrace = Environment.StackTrace;
}
}