(C#) Quick way to operate on multiple Array items in sequence?

Question

C# newbie working off some tutorials. Is there a way to run an identical command on every object in an array?

Here is my current (working) code:

     Guys[0].Cash += Guys[0].MyGuess.PayOut(WinnerNumber);
     Guys[1].Cash += Guys[1].MyGuess.PayOut(WinnerNumber);
     Guys[2].Cash += Guys[2].MyGuess.PayOut(WinnerNumber);

I'm looking for something that will do this:

     Guys[X].Cash += Guys[X].MyGuess.PayOut(WinnerNumber);

X = is first number on first runthrough, then 2nd number on 2nd runthrough, etc.

jason · Accepted Answer · 2009-12-29 01:39:32Z

8

You have several options:

Plain old for loop:

for(int i = 0; i < Guys.Length; i++) {
    Guys[i].Cash += Guys[i].MyGuess.PayOut(WinnerNumber);
}

foreach block:

foreach(var guy in Guys) {
    guy.Cash += guy.MyGuess.PayOut(WinnerNumber);
}

Array.ForEach:

Array.ForEach(Guys, g => g.Cash += g.MyGuess.PayOut(WinnerNumber));

These, for me, are in order of preference. Most will prefer the for loop because that is the familiar way of doing something to every item in array in sequence. It's close though between for and foreach.

answered Dec 29, 2009 at 1:39

jason

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2 Comments

user236494 Over a year ago

Awesome, thanks! The "for loop" method was in my tutorial book, but I was looking for something more like your 2nd two examples. Glad I know what my options are. Thanks much!

LukeH Over a year ago

Worth noting that foreach and Array.ForEach will only work if the type is a class, not a struct. If the type is a struct then attempting to use foreach will cause a compile-time error, which is fine, but Array.ForEach will fail silently at runtime without updating anything.

LukeH · Accepted Answer · 2009-12-29 01:34:58Z

1

You can do it with a for loop:

for (int i = 0; i < Guys.Length; i++)
{
    Guys[i].Cash += Guys[i].MyGuess.PayOut(WinnderNumber);
}

answered Dec 29, 2009 at 1:34

LukeH

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Comments

GrayWizardx · Accepted Answer · 2009-12-29 02:10:54Z

1

Its a not-widely documented idiom that you can actually do this with the foreach command, as long as this is a object[] construct:

foreach(GuyObject guy in Guys) {
   guy.Cash += guy.MyGuess.Payout(WinnerNumber);
}

Guess I should add LAMBDA version as well:

Array.ForEach(guys, guy => guy.Cash += guy.MyGuess.Payout(WinnerNumber));

edited Dec 29, 2009 at 2:10

answered Dec 29, 2009 at 1:35

GrayWizardx

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3 Comments

user236494 Over a year ago

Appreciate it! I'm not quite up to LINQ yet, but hopefully I'll have use for that soon. Also appreciate the explanation of foreach.

LukeH Over a year ago

ForEach isn't LINQ. It's a static method on the Array class itself.

GrayWizardx Over a year ago

Ugg. Long day, I meant "Lambda version"

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