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POStrange Inheritance Issue with C# classes
 

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    <pre><code>public class DTOa { public int Id { get; set;} public string FirstName { get; set;} } public class DTOb: DTOa { public string Email { get; set;} public string Password { get; set; } } public class a { protected DTOa _DTO = new DTOa(); public int Id { get { return _DTO.Id; } set { _DTO.Id = value; } } public string FirstName { get { return _DTO.FirstName; } set { _DTO.FirstName = value; } } public DTOa ToValueObject() { return _DTO; } } public class b: a { protected DTOb _DTO = new DTOb(); public string Email { get { return _DTO.Email; } set { _DTO.Email = value; } } public string Password { get { return _DTO.Password; } set { _DTO.Password = value; } } public DTOb ToValueObject() { return _DTO; } } </code></pre> <p>now let's execute the following code</p> <pre><code>public function test() { var a = new a(); var b = new b(); b.Id = 100; b.FirstName = "Jim"; b.Email = "email@email.com"; b.Password = "test"; Console.WriteLine(b.ToValueObject().Dump()); } </code></pre> <p>the problem is that </p> <ol> <li><p>I expect b.ToValueObject have all properties set, but in reality only get properties from DTOb class (so I FirstName and Id properties are NULL, however I set the explicitly)</p> <pre><code>dump: { Email: email@email.com, Password: test, Id: 0 } </code></pre></li> </ol> <p>Any ideas why ID is not set and FirstName is not set? DTOb is inherited from DTOa and thus "Should" include all the properties from DTOa. It's working on the code level, so if I write <code>console.WriteLine(b.Firstname)</code> - I'll get the value correct, but when I call <code>ToValueObject()</code> method - it got deleted.</p> <hr> <p>OKay here is working example:</p> <pre><code>public class DTOa : IDTO { public int Id { get; set; } public string FirstName { get; set; } } public class DTOb : DTOa, IDTO { public string Email { get; set; } public string Password { get; set; } } public class a { protected IDTO _DTO; public a() { _DTO = new DTOa(); } public int Id { get { return (_DTO as DTOa).Id; } set { (_DTO as DTOa).Id = value; } } public string FirstName { get { return (_DTO as DTOa).FirstName; } set { (_DTO as DTOa).FirstName = value; } } public DTOa ToValueObject() { return (_DTO as DTOa); } } public class b : a { public b() { _DTO = new DTOb(); } public string Email { get { return (_DTO as DTOb).Email; } set { (_DTO as DTOb).Email = value; } } public string Password { get { return (_DTO as DTOb).Password; } set { (_DTO as DTOb).Password = value; } } public DTOb ToValueObject() { return _DTO as DTOb; } } </code></pre>
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    1. USMichael Celey
    1. USDmitry
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    1. COdmitry - if you are so lucky to have another oo dvlp in your shop w/ more experience, print this page out, study the crap out of it, and meet w/ them for 1/2 hour. It's impossible to get the class layout of a program right the first few times you try - there are a few classic (and understandable new oo engineer) design slips here and talking with a real person who's been there can't be beat by any book or webpages. The clincher - after 15 min, ask them to help you design it right. Getting it wrong can't happen the first time b/c it's too expensive and you live with impossible code forever.
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      1. USFastAl
 

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