enum array index in c#

Question

I am working with RGB colour data in a C# (WPF) app, and find myself with a lot of cut and pasted code along the lines of

totals.red += currentPixel.red;
totals.green += currentPixel.green;
totals.blue += currentPixel.blue;

I'd like to reduce this copy-pasting and vulnerability to copy-paste errors. I could use arrays of size 3 around the place, but accessing those by number reduces readability.

I'd like to write something like this:

for (col = all colours) {
  totals[col] += currentPixel[col];
}

I'd know how to go about this in C, but am unfamiliar with C#. Something with enums?

Edit: Made the example make more sense.

Are red, green and blue all members of a type, or are just just hanging around on their own? If the former, which type, if the latter, why aren't they grouped together? — Servy
– Servy, Commented Nov 21, 2012 at 16:34
As others have commented, it's not clear what you are trying to achieve. I'd rather you write it out in C and have people help you translate the same to C#. — Gichamba
– Gichamba, Commented Nov 21, 2012 at 16:39

itsme86 · Accepted Answer · 2012-11-21 16:49:42Z

1

If you really want to use enums for this, you can do it this way:

enum Color { red, green, blue };

{
    foreach (int colorValue in Enum.GetValues(typeof(Color)))
        thing[colorValue] = otherthing[colorValue] * 2;
}

This would also allow you to grab an individual color by name in other code:

var color = thing[Color.red];

edited Nov 21, 2012 at 16:49

answered Nov 21, 2012 at 16:40

itsme86

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1 Comment

blueshift Over a year ago

This is the most promising so far, I think.

rufu5 · Accepted Answer · 2012-11-21 16:38:06Z

0

Assuming that red, green and blue are of type Color

You can setup a List of colours

List<Color> colors = new List<Color>();

Add items to it:

colors.Add(green);
colors.Add(blue);
colors.Add(red);

Then itterate:

foreach (Color color in colors)
{
    color.thing = color.otherThing * 2
}

answered Nov 21, 2012 at 16:38

rufu5

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Comments

Community · Accepted Answer · 2017-05-23 12:04:36Z

0

Enums won't help here. But you can define your own type as done in Integer array or struct array - which is better?, and overload the arithmetic operators as described in http://msdn.microsoft.com/en-us/library/8edha89s(v=vs.80).aspx to allow multiplying to an int for example. E.g.

thing = otherthing * 2;

edited May 23, 2017 at 12:04

CommunityBot

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answered Nov 21, 2012 at 16:38

fsimonazzi

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