Reference variable from a different method, class, file

Question

I need to reference the value of a variable in a different method, class, and file than the one I am currently in. I am brand new to C# and still trying to get these concepts.

Answer 1

Can this not be done with a public property?

public class Service
{
    public bool MyVariable { get; set; }
    public bool AddRoute(l, m, n)
    {
        MyVariable = xyz;
    }
}  

Answer 2

In your case, you can set that variable as return parameter of your method:

namespace Planning
{
    public class Service
    {
        public bool AddRoute()
        { 
            bool variable = true;
            return variable;
        }
    }
}

Call from different class:

namespace Planning
{
    public class AnotherClass
    {
        public void DoSomething()
        {
            Service service = new Service();
            bool otherVariable = service.AddRoute();
        }
    }
}

Now value of your variable from AddRoute method is inside otherVariable in another class.

Answer 3

I hope i will not confuse you even more.

The "variable in the other class" should be a property of that class. You need to make sure it is public, and then, you need the AddRoute method get an instance of that class with that property set. You could then access the property value using something like otherClassInstance.xyz.

If the above confuses you, I suggest starting at the beginning, learning about Object Oriented Programming before attempting any coding at all.

Answer 4

Short answer: you can't, period.

What you can do is set a public member variable:

namespace Planning
{
    public class Service
    {
        public bool variable;

        public bool AddRoute(l, m, n)
        { 
            variable = xyz;
        }
    }
}

But public member variables are frowned-upon, with good reason.

Better yet, add a read-only property that returns the value of a private member variable:

namespace Planning
{
    public class Service
    {
        private bool variable;

        public bool Variable
        {
          get 
          {
            return variable;
          }
        }

        public bool AddRoute(l, m, n)
        { 
            variable = xyz;
        }
    }
}

Then from elsewhere:

Planning.Service myObj = new Planning.Service();
myObj.AddRoute(1,2,3);

if (myObj.Variable)
{
  // ...
}