Create all combinations of n*m values

Question

Say I have a data structure of IEnumerable> like this:

{
    { A, B }
    { 1, 2, 3 }
    { Z }
}

Answer 1

You could use CartesianProduct method by Eric Lippert for this (taken from here):

static IEnumerable> CartesianProduct(
    this IEnumerable> sequences) 
{ 
  IEnumerable> emptyProduct = new[] { Enumerable.Empty() }; 
  return sequences.Aggregate( 
    emptyProduct, 
    (accumulator, sequence) =>  
      from accseq in accumulator  
      from item in sequence  
      select accseq.Concat(new[] {item}));                
}