protected virtual void OnChanged(IBindable <T> changedBinding)
{
if (_isUpdating)
{
return;
}
var wasSourceDisposed = (bool?)null;
if (changedBinding == Target && (Mode & BindingMode.FromTarget) == 0)
{
return;
}
if (changedBinding == Source && (Mode & BindingMode.IntoTarget) == 0)
{
return;
}
_isUpdating = true;
var isTarget = changedBinding.Equals(Target);
var gettingFrom = isTarget ? "target" : "source";
var puttingIn = !isTarget ? "target" : "source";
var valueTarget = isTarget ? Source : Target;
T value;
try
{
value = changedBinding.Value;
}
catch (Exception ex)
{
if (ex is ObjectDisposedException || ex.InnerException is ObjectDisposedException)
{
Debug.WriteLine($"In binding ({BindingString}), when the {gettingFrom} changed, tried to get the value but the object was disposed.");
wasSourceDisposed = changedBinding != Target;
//!!!! WARNING WARNING WARNING !!!! CODER DISCRETION IS ADVISED:
goto skipUpdate;
}
else
{
throw;
}
}
try
{
valueTarget.Value = value;
}
catch (Exception ex)
{
if (ex is ObjectDisposedException || ex.InnerException is ObjectDisposedException)
{
Debug.WriteLine($"In binding ({BindingString}), when the {gettingFrom} changed, tried to update the {puttingIn}'s value, but the object was disposed.");
wasSourceDisposed = changedBinding != Target;
}
else
{
throw;
}
}
skipUpdate:
_isUpdating = false;
switch (wasSourceDisposed)
{
case true:
Debug.WriteLine($"In binding ({BindingString}), the source (rightmost) was disposed, so the binding will be scrapped.");
Dispose();
break;
case false:
Debug.WriteLine($"In binding ({BindingString}), the target (leftmost) was disposed, so the binding will be scrapped.");
Dispose();
break;
case null:
//provided for emphasis
break;
}
}
