accessing public variable inside protected method

Question

I have public class and a public variable inside class.

public class Student 
{
    public string _firstName = null;

}

I have protected method in Student class where i am setting _firstName value

protected override void validate()
{

_firstName = "Test 1"
}

But, when i try to use _firstName value in another protected method of same class , it always gives null to me.

protected override string buildName()
{
    return String.Format("{0}_{1}", _firstName, _lastName);
}

Why? Am i missing some important concept here?

Answer 1

除非我误解了，否则您应该在方法中设置变量FullName，而不是_firstName。