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    <blockquote> <p>is this the safe way of iterating over a concurrent dictionary? If not, what is the safe way for doing it?</p> </blockquote> <p>Yes, it's safe in that it won't throw an exception. If elements are added or removed after you start iterating, they may or may not be included in the iteration. From the <a href="http://msdn.microsoft.com/en-us/library/dd287131.aspx" rel="nofollow noreferrer"><code>GetEnumerator</code> documentation:</a></p> <blockquote> <p>The enumerator returned from the dictionary is safe to use concurrently with reads and writes to the dictionary, however it does not represent a moment-in-time snapshot of the dictionary. The contents exposed through the enumerator may contain modifications made to the dictionary after GetEnumerator was called.</p> </blockquote> <p>Next:</p> <blockquote> <p>I use the tryRemove method, but what do I do with the outPerson object?</p> </blockquote> <p>Whatever you want with it, including nothing. You could just cast the dictionary to <code>IDictionary&lt;TKey, TValue&gt;</code> and call <code>Remove</code>, or just use <code>TryRemove</code> and ignore the variable afterwards:</p> <pre><code>Person ignored; dictionary.TryRemove(key, out ignored); </code></pre> <p>There's no concept of "clearing [the object] completely" - if you haven't got any references to it, it will be garbage collected. But either way, it's not in the dictionary any more (at least via that key). If you don't use the variable (<code>ignored</code> above) anywhere else in the code, it won't stop the object from being garbage collected.</p>
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    1. USChristian Gollhardt
    1. USJon Skeet
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    1. COThanks for your explanation! Much appreciated.
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      1. USCharles Whitfield
    2. COI saw this question and immediately knew there would be an answer from Jon Skeet.. lo and behold!
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      1. USdavnicwil
    3. CO@ Jon Skeet - Would this be the correct way to cast it? IDictionary<int,Person> removefromColl=(IDictionary<int,Person>)personColl;
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