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c#global-variables
user1277070
user1277070

Reputation: 785

Global variable in C#

I want to use some global variables in my program. Do we have anything which could help directly define global variables as we have #define in C++.

For Eg: Say I have the below mentioned global variables in C++:

#define CROSSOVER_RATE            0.7
#define MUTATION_RATE             0.001
#define POP_SIZE                  100        
#define CHROMO_LENGTH             300
#define GENE_LENGTH               4
#define MAX_ALLOWABLE_GENERATIONS   400

I wish to define these in my C# program as global variables only. Please let me know how can I do it?

Upvotes: 5

Views: 4053

Answers (2)

Jordão
Jordão

Reputation: 56537

You can define them inside a class:

public static class Constants {
  public const double CrossoverRate = 0.7;
  ...
}

Use them like this: Constants.CrossoverRate.

But I'd only do that if they were really constant, like PI. For parameters that can change, I'd prefer using a class with instance-level values. I think you'll want this kind of flexibility to tune your genetic algorithm, or to use more than one parameter-set at once. This is one way to do it (immutable class):

public class GeneticAlgorithmParameters {

  public double CrossoverRate { get; private set; }
  ...

  public GenericAlgorithmParameters(double crossoverRate, ... others) {
    CrossoverRate = crossoverRate;
    ...
  }

}

Now you pass an instance of GeneticAlgorithmParameters to your GeneticAlgorithm class constructor.

Upvotes: 8

Michael Schnerring
Michael Schnerring

Reputation: 3661

public static class Constants
{
    public const string MyConstant = "constantValue";
}

You call them as follows:

public void MyMethod
{
    var string = Constants.MyConstant;
}

Upvotes: 1

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