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Old August 5th, 2007, 07:35 AM
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Default Optional prameters and C#?


In the first chapter there is a metho with the signture
Public Shared Function GetContactsByFirstLetterAsCollection(ByVal DiaryId As Integer, Optional ByVal FirstLetterOfSurname As Char = "*") As ContactCollection

There is no such a behavior in C# so I have written
public static ContactCollection GetContactsByFirstLetterAsCollection(int diaryId, char FirstLetterOfSurname)
        if (FirstLetterOfSurname == 0)
            FirstLetterOfSurname = '*';

I'm not sure that this is the best solution, any ideas?

Old August 5th, 2007, 11:07 AM
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Hi there,

IMO, it's cleaner to create an overload that calls the initial method passing in the default value. E.g.:

public static ContactCollection GetContactsByFirstLetterAsCollection(int diaryId)
  return GetContactsByFirstLetterAsCollection(diaryId, '*');

This way, calling code can skip the firstLetterOfSurname param by simply calling something like:


while you can still provide a firstLetterOfSurname by calling the other overload:

  GetContactsByFirstLetterAsCollection(5, 's');

Hope this helps,


Imar Spaanjaars
Everyone is unique, except for me.
Author of ASP.NET 2.0 Instant Results and Beginning Dreamweaver MX / MX 2004
Old August 5th, 2007, 12:17 PM
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Yes it's better :) thanks

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