C#: Linq style "For Each"

Question

Possible Duplicate:
Linq equivalent of foreach for IEnumerable

Is there any linq style syntax for "For each" operations?

For instance, add values based on one collection to another, already existing one:

IEnumerable<int> someValues = new List<int>() { 1, 2, 3 };
IList<int> list = new List<int>();

someValues.ForEach(x => list.Add((x + 1));

Instead of

foreach(int value in someValues)
{
  list.Add(value + 1);
}

Answer 1

Using the ToList() extenstion method is your best option:

someValues.ToList().ForEach(x => list.Add((x + 1));

There is no extenstion method in the BCL that implements ForEach directly.

Answer 2

There isn't anything like that in standard Linq, but there is a ForEach operator in MoreLinq.

Answer 3

The Array and List<T> classes already have ForEach methods, though only this specific implementation. (Note that the former is static, by the way).

Not sure it really offers a great advantage over a foreach statement, but you could write an extension method to do the job for all IEnumerable<T> objects.

public static void ForEach<T>(this IEnumerable<T> source, Action<T> action)
{
    foreach (var item in source)
        action(item);
}

This would allow the exact code you posted in your question to work just as you want.

Answer 4

http://stackoverflow.com/questions/200574/linq-equivalent-of-foreach-for-ienumerable

Answer 5

There isn't anything built-in, but you can easily create your own extension method to do it:

public static void ForEach<T>(this IEnumerable<T> source, Action<T> action)
{
    if (source == null) throw new ArgumentNullException("source");
    if (action == null) throw new ArgumentNullException("action");

    foreach (T item in source)
    {
        action(item);
    }
}

Answer 6

The official MS line is "because it's not a functional operation" (ie it's a stateful operation).

Couldn't you do something like:

list.Select( x => x+1 )

or if you really need it in a List:

var someValues = new List<int>( list.Select( x => x+1 ) );

Answer 7

There is no Linq ForEach extension. However, the List class has a ForEach method on it, if you're willing to use the List directly.

For what it's worth, the standard foreach syntax will give you the results you want and it's probably easier to read:

foreach (var x in someValues)
{
    list.Add(x + 1);
}

If you're adamant you want an Linq style extension. it's trivial to implement this yourself.

public static void ForEach<T>(this IEnumerable<T> @this, Action<T> action)
{
   foreach (var x in @this)
      action(x);
}