How to iterate over two arrays at once?

Question

I have two arrays built while parsing a text file. The first contains the column names, the second contains the values from the current row. I need to iterate over both list

Answer 1

In a functional language you would usually find a "zip" function which will hopefully be part of a C#4.0 . Bart de Smet provides a funny implementation of zip based on existing LINQ functions:

public static IEnumerable Zip(
  this IEnumerable first, 
  IEnumerable second, 
  Func func)
{
  return first.Select((x, i) => new { X = x, I = i })
    .Join(second.Select((x, i) => new { X = x, I = i }), 
    o => o.I, 
    i => i.I, 
    (o, i) => func(o.X, i.X));
}

Then you can do:

  int[] s1 = new [] { 1, 2, 3 };
  int[] s2 = new[] { 4, 5, 6 };
  var result = s1.Zip(s2, (i1, i2) => new {Value1 = i1, Value2 = i2});