/// <summary>
/// Tries to set value.
/// </summary>
public static bool TrySetValue <TResult>([CanBeNull] this BindingMemberValue memberValue, object[] args, out TResult result)
{
result = default(TResult);
if (memberValue == null)
{
return(false);
}
object source = memberValue.MemberSource.Target;
if (memberValue.MemberSource.Target == null)
{
return(false);
}
try
{
var value = memberValue.Member.SetValue(source, args);
if (value is TResult)
{
result = (TResult)value;
}
}
catch (Exception exception)
{
Tracer.Error(exception.Flatten(false));
return(false);
}
return(true);
}
private void TryRegisterEvent(BindingMemberValue bindingMemberValue, object newValue, IDataContext context)
{
if (newValue == null && _closure == null)
{
return;
}
if (_closure == null)
{
Interlocked.CompareExchange(ref _closure, new EventClosure(ServiceProvider.WeakReferenceFactory(this, true), _toggleEnabledState), null);
}
_closure.LastContext = context;
_closure.SetValue(bindingMemberValue, newValue);
}
/// <summary>
/// Gets the source value.
/// </summary>
protected override object GetValueInternal(IBindingMemberInfo targetMember, IDataContext context,
bool throwOnError)
{
if (targetMember.MemberType == BindingMemberType.Event)
{
if (_getSourceMemberValue == null)
{
_getSourceMemberValue = new BindingMemberValue(this, BindingMemberInfo.MultiBindingSourceAccessorMember);
}
_lastContext = context;
return(_getSourceMemberValue);
}
return(base.GetValueInternal(targetMember, context, throwOnError));
}
public void SetValue(BindingMemberValue currentValue, object newValue)
{
//it's normal here.
lock (this)
{
if (_currentValue != null && Equals(currentValue.Member, _currentValue.Member) &&
Equals(_currentValue.MemberSource.Target, currentValue.MemberSource.Target))
{
SetValue(newValue);
}
else
{
UnsubscribeEventHandler();
currentValue.TrySetValue(new object[] { this }, out _subscriber);
if (_subscriber != null)
{
_currentValue = currentValue;
SetValue(newValue);
}
}
}
}
/// <summary>
/// Gets the value of binding member.
/// </summary>
public static object GetValue([CanBeNull] this BindingMemberValue memberValue, object[] args)
{
if (memberValue == null)
{
return(BindingConstants.UnsetValue);
}
object source = memberValue.MemberSource.Target;
if (source == null)
{
return(BindingConstants.UnsetValue);
}
try
{
return(memberValue.Member.GetValue(source, args));
}
catch (Exception exception)
{
Tracer.Error(exception.Flatten(false));
return(BindingConstants.UnsetValue);
}
}
