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VB.Net -> C# translation -- Array declaration

Posted on 2009-05-06
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Last Modified: 2013-12-17
This is stupid ... but ... how does the following line of VB.Net translate into C#?

Private SeparationColors(MAX_COLORS) As System.Drawing.Color

(MAX_COLORS is Private Const MAX_COLORS As Byte = 25 which I've translated just fine.)

Thanks!
   
//I tried:
       private System.Drawing.Color[MAX_COLORS] SeparationColors;
//but got
//Array size cannot be specified in a variable declaration (try initializing with a 'new' expression)	
 
 
 
        private System.Drawing.Color[] SeparationColors;
        SeparationColors = new System.Drawing.Color[MAX_COLORS];
//but got 2 additional errors.
 
 
        private fixed System.Drawing.Color[] SeparationColors[MAX_COLORS];
//but got
//Fixed size buffer type must be one of the following: bool, byte, short, int, long, char, sbyte, ushort, uint, ulong, float or double

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Question by:Daniel Wilson
10 Comments
 
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Accepted Solution

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Cebik earned 1000 total points
ID: 24315354

private System.Drawing.Color[] SeparationColors = new System.Drawing.Color[MAX_COLORS];

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Expert Comment

by:Cebik
ID: 24315384

class a
{
    private System.Drawing.Color[] SeparationColors;
 
    public a()
    {
        SeparationColors = new System.Drawing.Color[MAX_COLORS];
    }
}

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Author Closing Comment

by:Daniel Wilson
ID: 31578478
I knew I was missing something simple!

Thanks!
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Expert Comment

by:Fernando Soto
ID: 24315404
Try it like this:

private System.Drawing.Color[] SeparationColors = new System.Drawing.Color[MAX_COLORS];
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Expert Comment

by:CuteBug
ID: 24315405
This should work

Make sure that you have defined MAX_COLOR as int.

int MAX_COLOR = 256;
System.Drawing.Color[] arrColor = new System.Drawing.Color[MAX_COLOR];

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Expert Comment

by:Cebik
ID: 24315422
Hi ;)

class a
{
    private const byte MAX_COLORS = 25;
    private byte[] SeparationColors = new byte[MAX_COLORS];
 
    public a()
    {
    }
}

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Expert Comment

by:tculler
ID: 24315428
The above obviously works, but there's really no explanation there.

In C#, the array declaration is considered part of the object's "type". For example, unlike VB and C++, we must say

int[] someArray

instead of

int someArray[]

Also, the arrays are, by default, initialized to "null" ("Nothing" in VB). So, the declaration

System.Drawing.Color[] myColors;

is the same as saying

System.Drawing.Color[] myColors = null; // Nothing, no colors in the array

However, if you do initialize your array, you MUST give the size (this is the downside of arrays all around). For example, the following is NOT valid:

System.Drawing.Color[] myColors = new System.Drawing.Color[];

The second set of brackets must contain a positive integer value, no matter what.

The "fixed" keyword in C# has an entirely different meaning than in other languages--it has to do with pointers, and basically "pinning" them so the GC doesn't run off with the object.

Hope I helped,
Nate
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LVL 6

Expert Comment

by:Cebik
ID: 24315435
it's working checked


class a
{
    private const byte MAX_COLORS = 25;
    private System.Drawing.Color[] SeparationColors = new System.Drawing.Color[MAX_COLORS];
 
    public a()
    {
    }
}

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Expert Comment

by:cauos
ID: 24315447
private System.Drawing.Color[] SeparationColors = new System.Drawing.Color[MAX_COLORS];
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Expert Comment

by:Cebik
ID: 24315818
@tculler:

Thanks ;)
I don't speek english very well, thats why there was no explanation
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