public void Maybe_Cast_ReturnNothingOnInvalidCast()
{
Maybe <string> m = "test";
var x = m.Cast <decimal>();
Assert.True(x.IsEmpty);
Assert.Equal(Maybe <decimal> .Nothing, x);
}
public void Maybe_Cast_ReturnNothingWhenNothing()
{
Maybe <int> m = Maybe <int> .Nothing;
var x = m.Cast <decimal>();
Assert.True(x.IsEmpty);
Assert.Equal(Maybe <decimal> .Nothing, x);
}
public void Maybe_Cast_CastsWhenSomething()
{
Maybe <object> m = 6;
var x = m.Cast <int>();
Assert.False(x.IsEmpty);
Assert.Equal((int)6, x.Value);
}
public static Maybe <TAttribute> GetCustomAttribute <TAttribute>(this ICustomAttributeProvider provider, bool inherit)
where TAttribute : Attribute
{
if (provider == null)
{
throw new ArgumentNullException(nameof(provider));
}
var temp = provider.GetCustomAttributes(typeof(TAttribute), inherit).FirstOrDefault();
return(Maybe.Cast <TAttribute>(temp));
}
private DisconnectedDataContextRoot(Maybe <FrameworkElement> mayElementBase)
{
var mayRoot = ControlBindLogic.FindRoot(mayElementBase.Cast <FrameworkElement, DependencyObject>());
var elementBase = mayElementBase.Value;
void OnLoad(object sender, RoutedEventArgs args)
{
elementBase.Loaded -= OnLoad;
var root = mayRoot.OrElseDefault();
if (root is IView control && root is FrameworkElement {
DataContext : IViewModel model
})
{
_modelAction?.Invoke(model, control);
if (_unload != null)
{
control.ControlUnload += _unload;
}
}
public void Set <T>(ISymbol symbol, Maybe <T> value)
{
Guard.NotNull(symbol, "symbol");
_KeyedReaderWriter.Set(symbol, value.Cast <object>());
}
public MutatingContext <TData> WithChange <TChange>(Maybe <TChange> mutatingChange)
where TChange : MutatingChange
=> Update(mutatingChange.Cast <TChange, MutatingChange>(), Data);
