Return to Answer

You write in your comment

So paths[0], paths[1], paths[3], paths[6] are true, that means I want the method to generate a random number from 0,1,3,6. [...].

You can achieve this with LINQ:

// a few test values
var paths = new[] { true, true, false, true, false, false, true };
// initialize random numbers generator
var rnd = new Random((int)DateTime.Now.Ticks);
// get a random number for each 'true' value
var randomNumber = paths.Where(p => p).Select(p => rnd.Next(0, 4)).ToArray();

Remember to use constants instead of magic numbers:

const int minNumber = 0;
const int maxNumber = 4;

You write in your comment

So paths[0], paths[1], paths[3], paths[6] are true, that means I want the method to generate a random number from 0,1,3,6. [...].

You can achieve this with LINQ:

// a few test values
var paths = new[] { true, true, false, true, false, false, true };
// initialize random numbers generator
var rnd = new Random((int)DateTime.Now.Ticks);
// get a random number for each 'true' value
var randomNumber = paths.Where(p => p).Select(p => rnd.Next(0, 4)).ToArray();

Remember to use constants instead of magic numbers:

const int minNumber = 0;
const int maxNumber = 4;

According to your comment you can use LINQ to get the results you want like this:

// some test values
var paths = new[] { true, true, false, true, false, false, true };
// initialize random numbers generator
var rnd = new Random((int)DateTime.Now.Ticks);
// get a random number for each 'true' value
var randomNumber = paths.Where(p => p).Select(p => rnd.Next(0, 4)).ToArray();

I also suggest to use some constats for the min and max numbers:

const int minNumber = 0;
const int maxNumber = 4;
var randomNumber = paths
 .Where(p => p)
 .Select(p => rnd.Next(minNumber, maxNumber))
 .ToArray();

ToArray is actually optional and depends on what you are going to do with the results next.

You write in your comment

So paths[0], paths[1], paths[3], paths[6] are true, that means I want the method to generate a random number from 0,1,3,6. [...].

You can achieve this with LINQ:

// a few test values
var paths = new[] { true, true, false, true, false, false, true };
// initialize random numbers generator
var rnd = new Random((int)DateTime.Now.Ticks);
// get a random number for each 'true' value
var randomNumber = paths.Where(p => p).Select(p => rnd.Next(0, 4)).ToArray();

Remember to use constants instead of magic numbers:

const int minNumber = 0;
const int maxNumber = 4;