知道父类的子类重写方法而没有附加标志

如何知道子类正在重写其父类的方法？目前，我正在使用布尔标志，该标志在父类上设置为false，当子类覆盖它时，子类必须设置该标志。当它发挥作用时，我想知道是否有更清洁的解决方案来解决这个问题。

// The parent class
public Class_A
{
    protected bool _hasCheckData = false;
    public bool HasCheckData
    {
        get { return _hasCheckData; }
    }
    public abstract bool CheckData(File fileToCheck)
    {
        return true;
    }
}
// Lot's of children from class A, this is one of them
public Class_B : Class_A
{
    public override bool CheckData(File fileToCheck)
    {
        // the following line will be duplicated for all Class_A's children 
        // who implemented the checking of the file. How to avoid this?
        _hasCheckData = true; 
        // checking the file
        // and return the result
    }
}
public Class_C
{
    public void Test(File fileToCheck)
    {
       Class_B fileAbcChecker = new Class_B();
       if (fileAbcChecker.HasCheckData)
           fileAbcChecker.CheckData(fileToCheck);
    }
}