把for循环改成foreach循环

Question

int GetSeriesValue(Series series, double argument)
{
for (int i = 0; i < series.Points.Count - 1; i++)
{
if (series.Points[i].NumericalArgument == argument)
return i;
else if (series.Points[i].NumericalArgument < argument && series.Points[i + 1].NumericalArgument > argument)
{
double interval1 = argument - series.Points[i].NumericalArgument;
double interval2 = series.Points[i + 1].NumericalArgument - argument;
return interval1 <= interval2 ? i : i + 1;
}
}
return 0;
}

Answer 1

 int GetSeriesValue(Series series, double argument)
{
foreach (var item in series.Points.Zip(series.Points.Skip(1), (x, y) => new { x, y }))
{
if (item.x.NumericalArgument == argument)
return i;
else if (item.x.NumericalArgument < argument && item.y.NumericalArgument > argument)
{
double interval1 = argument - item.x.NumericalArgument;
double interval2 = item.y.NumericalArgument - argument;
return interval1 <= interval2 ? i : i + 1;
}
}
return 0;
}