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How to use NullToDate method of NBi.Core.Transformation.Transformer.Native.DateTimeToPreviousMonth class

Best NBi code snippet using NBi.Core.Transformation.Transformer.Native.DateTimeToPreviousMonth.NullToDate

DateToPointInTimeTest.cs

Source:DateToPointInTimeTest.cs

...213        [TestCase("2018-02-01 07:00:00", "2018-02-01 07:00:00")]214        [TestCase(null, "2001-01-01")]215        [TestCase("", "2001-01-01")]216        [TestCase("(null)", "2001-01-01")]217        public void Execute_NullToDate_Valid(object value, DateTime expected)218        {219            var function = new NullToDate(new LiteralScalarResolver<DateTime>(new DateTime(2001, 1, 1)));220            var result = function.Evaluate(value);221            Assert.That(result, Is.EqualTo(expected));222        }223        [Test]224        [TestCase("2018-02-01 00:00:00", "2018-02-01")]225        [TestCase("2018-02-01 07:00:00", "2018-02-01")]226        [TestCase("2018-02-12 07:00:00", "2018-02-01")]227        [TestCase(null, null)]228        [TestCase("(null)", null)]229        public void Execute_DateTimeToFirstOfMonth_Valid(object value, DateTime expected)230        {231            var function = new DateTimeToFirstOfMonth();232            var result = function.Evaluate(value);233            if (expected == new DateTime(1, 1, 1))...

DateTimeTransformations.cs

Source:DateTimeTransformations.cs

...107            var time = TimeSpan.Parse(Instant.Execute());108            return new DateTime(value.Year, value.Month, value.Day, time.Hours, time.Minutes, time.Seconds);109        }110    }111    class NullToDate : AbstractDateTimeTransformation112    {113        public IScalarResolver<DateTime> Default { get; }114        public NullToDate(IScalarResolver<DateTime> dt)115            => Default = dt;116        protected override object EvaluateNull() => Default.Execute();117        protected override object EvaluateDateTime(DateTime value) => value;118    }119    class DateTimeToFloorHour : AbstractDateTimeTransformation120    {121        protected override object EvaluateDateTime(DateTime value)122            => value.AddTicks(-1 * (value.Ticks % TimeSpan.TicksPerHour));123    }124    class DateTimeToCeilingHour : AbstractDateTimeTransformation125    {126        protected override object EvaluateDateTime(DateTime value)127            => value.AddTicks(TimeSpan.TicksPerHour - (value.Ticks % TimeSpan.TicksPerHour == 0 ? TimeSpan.TicksPerHour : value.Ticks % TimeSpan.TicksPerHour));128    }...

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