linq_and_foreach.cs

linq+foreach.cs

public class VersionTest
{
    private readonly ITestOutputHelper _outp;

    public VersionTest(ITestOutputHelper outp)
    {
        _outp = outp;
    }

    [Fact]
    void enumerable_with_foreach()
    {
        IEnumerable<int> LinqAndForeach()
        {
            List<int> strings = new List<int> { 1, 2, 3, 4, 5 };
            var resultOfLinq = strings
                .Select(i => i * 2)
                .Where(i => i > 2)
                .Select(i => i == 8 ? throw new Exception() : i); // se li esegue tutti schianta!

            foreach (var result in resultOfLinq)
            {
                _outp.WriteLine($"Executing with {result}!");
                yield return result;
            }
        }

        var result = LinqAndForeach().Take(2).ToList();

        Assert.Equal(2, result.Count);
    }

    [Fact]
    void enumerable_with_LINQ_only()
    {
        IEnumerable<int> LinqAndForeach()
        {
            List<int> strings = new List<int> { 1, 2, 3, 4, 5 };
            return
                strings
                    .Select(i => i * 2)
                    .Where(i => i > 2)
                    .Select(i => i == 8 ? throw new Exception() : i) // se li esegue tutti schianta!
                    .Select(result =>
                    {
                        _outp.WriteLine($"Executing with {result}!");
                        return result;
                    });
        }

        var result = LinqAndForeach().Take(2).ToList();

        Assert.Equal(2, result.Count);
    }
}