inherited / constructors : best code ?

Article View: borland.public.csharpbuilder.language.csharp

Article #395

Back to borland.public.csharpbuilder.language.csharp Previous Next

#395

From: OD
Date: Thu, 21 Jul 2005 21:47

56 lines
3242 bytes

Hi all,

I've got a coding problem and I'll appreciate your advise :

I used to add multiple constructors in classes with different 
paremeters. Each new constructor is calling the preceding (with one 
less parameter). That's right and avoid rewritting same inits :

public class A
 {
   public A()
   {
     // init here
   }

   public A(int param):this()
   {
    // use "param",
    // init is already done calling ":this()"
   }
 }

This is fine, till I create a new class inherited from the first one.
The problem is shown below :

public class B : A
 {
  public class B():base() // Problem 1
  {
   // init just what B adds to A
   // since i'm calling ":base()"
  }

  public class B(int param):this() // Problem 2
  {
   // init problem....
  }
 }

Problem 1 : is using ":base()" correct ?

Problem 2, the worst : this constructor can call either ":this()" or
":base(param)".
In the first case I lose the init of the parameter (done in A class),
in the second case I lose local init of class B done in the first 
constructor...

What is the best construction ? Is there some "best practices" or 
coding patterns for such a situation ?

Thanks in advance for ideas you'll bring..

-- 
Olivier Dahan
MK Query Builder
www.e-naxos.com

Technical Details

Message-ID: <mn.ad937d57748784b9.18651@0e-naxos.com>

Path:

arc1-ca.pugleaf.net!g2news1.google.com!news4.google.com!news.glorb.com!news.moat.net!news-out.newsfeeds.com!propagator3-LAX.newsfeeds.com!news-in.spamkiller.net!news-in.superfeed.net!caladan.landsraad.net!newsgroups.borland.com!not-for-mail

Show Full Headers

Complete Article Headers

X-Google-Thread: 1efe35,40a1073c2533bd08,start
X-Google-Attributes: gid1efe35,public
X-Google-Language: ENGLISH,ASCII-7-bit
Subject: inherited / constructors : best code ?
From: "OD" <OD[.@.]e-naxos.com>
Newsgroups: borland.public.csharpbuilder.language.csharp
Message-ID: <mn.ad937d57748784b9.18651@0e-naxos.com>
Organization: www.e-naxos.com
X-Newsreader: MesNews/1.04.00.00
Date: Thu, 21 Jul 2005 23:47:34 +0200
MIME-Version: 1.0
Face: iVBORw0KGgoAAAANSUhEUgAAAC4AAAApBAMAAAHPlTYqAAAAB3RJTUUH0wwfAAI7FsnlTwAAA
 AlwSFlzAAALEgAACxIB0t1+/AAAAARnQU1BAACxjwv8YQUAAAAVUExURczMzP///5mZmWZmZjNmZpm
 ZzAAzM6IOup8AAAIwSURBVHjaXVOxkuMgDBV46eH20hMBqb0W6XeM4toh462vyOT/P+EEzm5uDmeGe
 Y8nCT0RwA8CrAPoLwLNAeA3AAwaAhD4cYB1IbgywXrRoCcE9ADvBPV4eowSceQSCMwxRR1AgdfeA5J
 S9EeUFt4/AYFhGGVb7rJVON3fR9BmnjtiJg/G10Cj1N0ukh1gHaHtb60WIp2dA2spSxJE60DqDNSAt
 /HxuI8N1Cf4aEDQYeU7IzWg0yFm5htNvYTNcnLb663qxuHse4wsFT8RvtfABXu7GIi8lCXqRcMHgJM
 LdDA5Z6Ed9evI1cCqHRxtxBVs6EAd+PHg6/AC92uTbXh9gYpHwOXB6w682ZZSbl1WjzpypmGP8Zo5c
 +jNGf+L47L3Y6o/8InnQKE3Z8+1XgSIi9VD5ItUD91g9YYyTuguS47ox5+2Reh125QApBk0+h3oLNP
 FZoisEGhSIN1b5bQ4k6k8ee+UyJUVl3Tjc+fRK+X6HMVJcSUT7TxYMJtJvXbPJG+rya0zgZflXqis8
 ORr89gdolgmpvFZ/c8vT3744VE5U5/65ELn19R4u0WWgIIp9TTyihu/ih7nOE/blsLO90TKGuZZPuZ
 ET74FXO3A+yo/eqNlfE7008Ly2FKYSL42ktT4XFIszBdN+M2LXlnctii/BAEphNAmU5srJkYuc2oDk
 wG+XqjT7TJGCA3/rqS2bb1JXi+T8y9+wAlz8Vpr+Z+K832qbbAp54JCypE48Bf1mYlrJKOvfwAAAAB
 JRU5ErkJggg==
Plugin-EXIF: J'utilise schexif de Chasta (http://www.chasta.com/fr/plugin.htm)
Content-Type: text/plain; format=flowed
Content-Transfer-Encoding: 8bit
NNTP-Posting-Host: 83.193.5.138
X-Trace: newsgroups.borland.com 1121982452 83.193.5.138 (21 Jul 2005 14:47:32 -0700)
Lines: 58
Path: arc1-ca.pugleaf.net!g2news1.google.com!news4.google.com!news.glorb.com!news.moat.net!news-out.newsfeeds.com!propagator3-LAX.newsfeeds.com!news-in.spamkiller.net!news-in.superfeed.net!caladan.landsraad.net!newsgroups.borland.com!not-for-mail