Execute method for each object in generic list using lambda

Question

I'm still new to lambdas and find it hard to find out specific features for it, but is it possible to execute a method for each object in a generic list? Similar to how the ConvertAll works, but instead of converting, actually calling a method.

public class Mouse()
{
    public void Squeak()
    {
    }
}

List<Mouse> mice = new List<Mouse>();

mice.Add(new Mouse());
mice.Add(new Mouse());

How do you call the method Squeak for each mouse?

mice.???(m => m.Squeak());

sll · Accepted Answer · 2011-10-14 15:28:03Z

6

You can do it using List<T>.ForEach() method (see MSDN):

mice.ForEach(m => m.Squeak());

PS: What is fun that answer is in your question:

How do you call the method Squeak for each mouse?

answered Oct 14, 2011 at 15:28

sll

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Comments

jason · Accepted Answer · 2011-10-14 15:30:42Z

3

Please don't use List<T>.ForEach. It looks like a sequence operator. Sequence operators shouldn't have side effects. You're using something that looks like a sequence operator solely for its side effects. Instead, just use a plain-old boring loop:

foreach(var mouse in mice) {
    mouse.Squeak();
}

Eric Lippert has a fabulous article related to this topic: foreach vs. ForEach.

answered Oct 14, 2011 at 15:30

jason

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