Tag Archives: IEnumerable

Asserting on IEnumerable<T> + Race Conditions = Danger

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Ran into this xUnit test failure the other day:

Assert.Equal() Failure
Expected: Boolean[] [True, False, False]
Actual: SelectListIterator<Process, Boolean> [True, False, False]

Why the failure?

The values displayed for expected and actual match. The only difference visible in the error message are the collection types…but that can’t be the source of failure because xUnit’s Assert.Equal<T>(IEnumerable<T> expected, IEnumerable<T> actual) doesn’t compare the collection types of its arguments, just elements and their positions.

So why the failure? Continue reading →

Introducing DataReaderAdapter: Adds AsDataReader()/AsDataReaderOfObjects() to IEnumerable<T>

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Yesterday, we released BenGribaudoLLC.IEnumerableHelpers.DataReaderAdapter as a NuGet package!

What does it to?

Adapts IEnumerable<T> to the IDataReader interface. Enables enumerable sequences to be used where a data reader is expected.

Great for loading data from a List<T>, LINQ expression or CSV parser into a database using SqlBulkCopy! Streams data to SqlBulkCopy, bypassing the need to first materialize the entire sequence in memory and load it into a DataTable. Continue reading →