Duplication of events AddOrUpdate()

[FoxTes]

Tell me. Why is there a duplication of events for the following code?

        var daysRanges = new SourceCache<DaysRange, Guid>(daysRange => daysRange.Id);
        daysRanges.AddOrUpdate(DaysRange.Empty);
        daysRanges.Connect()
            .Log(this)
            .Sort(SortExpressionComparer<DaysRange>.Ascending(t => t.DateRange.Start ?? DateTime.MaxValue))
            .ObserveOn(RxApp.MainThreadScheduler)
            .Bind(out _daysRanges)
            .DisposeMany()
            .Subscribe();

Result:

[13:24:22 INF]  OnNext: ChangeSet<DaysRange.Guid>. Count=1
[13:24:23 INF]  OnNext: ChangeSet<DaysRange.Guid>. Count=1

[FoxTes]

UP!

[RolandPheasant]

I cannot replicate. This unit test passes.

    public record DaysRange(Guid Id, DateTime? Start = null);

    [Fact]
    public void CannotReplicate()
    {
        int count = 0;

        var daysRanges = new SourceCache<DaysRange, Guid>(daysRange => daysRange.Id);
        daysRanges.AddOrUpdate(new DaysRange(Guid.Empty));
        daysRanges.Connect()
            .Do(_=> count++)
            .Sort(SortExpressionComparer<DaysRange>.Ascending(t => t.Start ?? DateTime.MaxValue))
            .Bind(out var list )
            .DisposeMany()
            .Subscribe();

        count.Should().Be(1);
    }

[FoxTes]

It turns out the problem was in registering ViewModels. She was called twice. Sorry to bother you.

[RolandPheasant]

No problem. I suggest however that when you spot issues or anomalies to try and replicate it in a simplified unit test which can be run independent of the app. More often than not the process of creating a test reveals whether the issue is with the lib or the app.

[FoxTes]

You're right. It didn't even occur to me that the error lies precisely in the registration. Tests are our everything!