Call Constructor Base after Code Execution

Question

Let say we have Class A and Class B. ClassB extends Class A. (ClassB : ClassA)

Now let\'s say that whenever I instantiate ClassB, I\'d like to Run some Random code and o

Answer 1

Recently I ran into a scenario where I needed to calculate some logic before passing the result into base.

I could just do something like

public SomeConstructor: base(FlagValue == FlagValues.One || FlagValues.Two ? "OptionA" : "OptionB")
{

}

But I find that to be ugly, and can get really long horizontally. So I opted instead to use Func Anonymous methods.

E.g. imagine you have a base class,

public class SomeBaseClass
{
  public SomeBaseClass(Func GetSqlQueryText){
    string sqlQueryText = GetSqlQueryText();
    //Initialize(sqlQueryText);
  }
}

Now you inherit from that and want to do some logic to determine the sql query text,

public class SomeSqlObject : SomeBaseClass
{
  public SomeSqlObject(ArchiveTypeValues archiveType)
        : base(delegate()
        {
            switch (archiveType)
            {
                case ArchiveTypeValues.CurrentIssues:
                case ArchiveTypeValues.Archived:
                    return Queries.ProductQueries.ProductQueryActive;
                case ArchiveTypeValues.AllIssues:
                    return     string.Format(Queries.ProductQueries.ProductQueryActiveOther, (int)archiveType);
                default:
                    throw new InvalidOperationException("Unknown archiveType");
            };
        })
    {
        //Derived Constructor code here!
    }

}

In this way you can execute code before Base is called and (in my opinion) it's not really hacky.