CODEWITHSUNDEEP
c#.net
gdoron
gdoron

Reputation: 150253

Declare Color as constant

How can I declare the Color type as const like this:

private const Color MyLovedColor = Color.Blue;

That doesn't work because the Color.Blue is static not const.

(readonly won't help me because I need the color for an attribute which "support" constants only

Upvotes: 12

Views: 15302

Answers (5)

lws
lws

Reputation: 1

What if you used the long value returned by the RGB function as your constant?

for example the value returned for a light blue RGB(51,255,255) is 16777011

so

Private Const ltBlue As Long = 16777011    
txtbox1.backcolor = ltBlue

Upvotes: 0

Alexander Galkin
Alexander Galkin

Reputation: 12534

You can assign a const only a value that is a literal. In your case I would then prefer a string literal and define your color as following:

const string mycolor = "Blue";

Then, wherever you need your color, you perform the backward conversion:

Color mynewcolor = Color.FromName(mycolor);

I am sorry, but this is the only way to keep it const.

EDIT: Alternatively you can also keep your color as (A)RGB attributes, stored into a single int value. Note, that you can use a hexadecimal literal then to explicitly set the different components of your color (in ARGB sequence):

const int mycolor = 0x00FFFFFF;
Color mynewcolor = Color.FromArgb(mycolor);

Upvotes: 6

leppie
leppie

Reputation: 117240

Look at the KnownColor enumeration. It will likely cater for what you need.

Upvotes: 12

Neil Thompson
Neil Thompson

Reputation: 6425

private static readonly Color MyLovedColor = Color.Blue;

I thanks that's the closest you can get?

Upvotes: 3

Jon
Jon

Reputation: 437376

System.Drawing.Color is a struct, which means you cannot have a constant value of it.

Upvotes: 4

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