Dictionary.Add() defeat already exists exception
in [CSharp]
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From: cate on 9 May 2010 12:16 Is there a switch somewhere, or a different hash, that will allow me to add the same key again and again with out throwing? Thank you.
From: Family Tree Mike on 9 May 2010 12:23 On 5/9/2010 12:16 PM, cate wrote: > Is there a switch somewhere, or a different hash, that will allow me > to add the same key again and again with out throwing? > Thank you. If you had two keys named "FindMe", one pointing to "Fred", one pointing to "Barney", then how would code know which to return for MyDictionary ["FindMe"]? There actually is a trick, but to use the trick, you would need to have a good explanation as to why you want duplicate strings as keys. -- Mike
From: Arne Vajhøj on 9 May 2010 13:14 On 09-05-2010 12:16, cate wrote: > Is there a switch somewhere, or a different hash, that will allow me > to add the same key again and again with out throwing? The term Add indicates that a new entry is added. If a new entry is not added, then it seems rather fair that an exception is thrown. The syntax: dic[key] = val; allows you to both add and update with the same syntax. Note that this syntax does not in current implementation do a test and a remove if already exists - both Add and this set calls the same private Insert method which determines whether to throw an exception or update the value based on a flag passed on to it. Arne
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