c# 4.0 - Check duplicate key in Hashtable before adding a key -


i have hashtable , want put check whether hashtable has key or not before adding key in hashtable. adding duplicate key in hashtable throwing exception. want override hashtable's virtual 'add' method , put check in it. dont know how can override add method.

please me write override method.

you can use containskey.

another way use item indexer-property adds new keys , updates existing.

var ht = new system.collections.hashtable(); ht["test"] = "foo"; // added ht["test"] = "bah"; // updated

however, should consider replace old , redundant hashtable generic dictionary<tkey, tval>. why?


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