private void CreateHelpersSubscription()
{
var existingHelpers = UnderlingConfiguration.Helpers.ToDictionary(
o => _pathInfoStore.GetOrAdd($"[{o.Key}]"),
o => new StrongBox <HelperDescriptorBase>(o.Value)
);
Helpers = new ObservableDictionary <PathInfo, StrongBox <HelperDescriptorBase> >(existingHelpers, Compatibility.RelaxedHelperNaming ? PathInfo.PlainPathComparer : PathInfo.PlainPathWithPartsCountComparer);
var helpersObserver = new ObserverBuilder <ObservableEvent <HelperDescriptorBase> >()
.OnEvent <ObservableDictionary <string, HelperDescriptorBase> .ReplacedObservableEvent>(
@event => Helpers[_pathInfoStore.GetOrAdd($"[{@event.Key}]")].Value = @event.Value
)
.OnEvent <ObservableDictionary <string, HelperDescriptorBase> .AddedObservableEvent>(
@event =>
{
Helpers.AddOrUpdate(_pathInfoStore.GetOrAdd($"[{@event.Key}]"),
h => new StrongBox <HelperDescriptorBase>(h),
(h, o) => o.Value = h,
@event.Value);
})
.OnEvent <ObservableDictionary <string, HelperDescriptorBase> .RemovedObservableEvent>(@event =>
{
if (Helpers.TryGetValue(_pathInfoStore.GetOrAdd($"[{@event.Key}]"), out var helperToRemove))
{
helperToRemove.Value = new LateBindHelperDescriptor(@event.Key, this);
}
})
.Build();
UnderlingConfiguration.Helpers
.As <ObservableDictionary <string, HelperDescriptorBase> >()
.Subscribe(helpersObserver);
}
public void AddOrUpdateAddsNewItem()
{
// given
var key = 1;
var value = "One";
using (var observableDictionary = new ObservableDictionary<int, string>())
{
// when
observableDictionary.AddOrUpdate(key, value);
// then check whether all items have been accounted for
observableDictionary.Count.Should().Be(1);
observableDictionary.Should().Contain(1, "One");
}
}
public void AddOrUpdateAllowsUpdateForExistingKeyWithSameValue()
{
// given
var initialKvPs = new List<KeyValuePair<int, string>>()
{
new KeyValuePair<int, string>(1, "One")
};
using (var observableDictionary = new ObservableDictionary<int, string>(initialKvPs))
{
// when
observableDictionary.AddOrUpdate(1, "One");
// then check whether all items have been accounted for
observableDictionary.Count.Should().Be(1);
observableDictionary.Should().Contain(1, "One");
}
}
public void AddOrUpdateShouldAllowUpdateWithDefaultValue()
{
// given
var initialKvPs = new List<KeyValuePair<string, string>>()
{
new KeyValuePair<string, string>("1", "One Value")
};
using (var observableDictionary = new ObservableDictionary<string, string>(initialKvPs))
{
// when
Action action = () => observableDictionary.AddOrUpdate("1", default(string));
// then
action.ShouldNotThrow<ArgumentNullException>();
observableDictionary.Count.Should().Be(1);
observableDictionary.Should().Contain("1", default(string));
}
}
public void AddOrUpdateThrowsOnNullKey()
{
// given
using (var observableDictionary = new ObservableDictionary<string, string>())
{
// when
Action action = () => observableDictionary.AddOrUpdate(null, null);
// then
action
.ShouldThrow<ArgumentNullException>()
.WithMessage("Value cannot be null.\r\nParameter name: key");
observableDictionary.Count.Should().Be(0);
}
}
public void AddOrUpdateShouldAllowAddWithDefaultValue()
{
// given
using (var observableDictionary = new ObservableDictionary<string, string>())
{
// when
Action action = () => observableDictionary.AddOrUpdate("1", default(string));
// then
action.ShouldNotThrow<ArgumentNullException>();
observableDictionary.Count.Should().Be(1);
observableDictionary.Should().Contain("1", default(string));
}
}
