Is there a way to use a variable in multiple classes in C#?

If I define a variable in one class file, is开发者_JAVA技巧 there a way to access the same variable in another class?

class Class1
{
    static const int myInteger = 256;
}

class Class2
{
    private void myMethod()
    {
        int i = Class1.myInteger;
        //i is now 256.
    }
}

You can declare the variable as static at the topmost scope of your first class (Class1). See the MSDN article for more information regarding static members:

http://msdn.microsoft.com/en-us/library/79b3xss3(v=vs.80).aspx

Yes, if you have a reference to an object of the first class. Or if that variable is a public static member of the first class, in which case you don't need am object reference.

Yes, provide access to it via a Property.

http://msdn.microsoft.com/en-us/library/x9fsa0sw%28v=VS.71%29.aspx

Variables should be exposed as public properties or fields if you want to access them through other classes. However these classes need a relationship.

public class C1
{
  public int x = 1;
}

public class C2
{
  private C1 otherClass;

  // constructor
  public C2(C1 other)
  {
    this.otherClass = other;
  }

  public void accessOtherClass()
  {
    Console.WriteLine(this.otherClass.x);
  }
}