C# finding a certain condition of a object via a dictionary -

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Currently I'm using this method to determine if a character is online: 

  public bool online bicycler (string username) {foreach (character c.charts.wols in it) {if (c! = Null & amp; amp; amp; amp; amp; amp; amp; amp; amp; amp; amp; amp; amp; amp; )) {Return; }         }         return false; }

Is there a faster way to do this?

Actually there is not a quick way to do this, if you put the letter as a dictionary value Want to To be sorted out, a linear o (n) search must be done.


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