Linq Select 5 items per Iteration [duplicate]

Answer 1

You can also do this with pure linq by taking advantage of integer arithmetic and the GroupBy method:

int blockSize = 5;
var group = theList.Select((x, index) => new { x, index })
                   .GroupBy(x => x.index / blockSize, y => y.x);

foreach (var block in group)
{
    // "block" will be an instance of IEnumerable
    ...
}

There are a number of advantages to this approach which aren't necessarily immediately apparent:

• Execution is deferred, so it's efficient when you're working with conditional processing
• You don't need to know the length of the collection, thus avoiding multiple enumeration while also being generally cleaner than other approaches