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    <p>For modification of elements, one option is to manually iterate the dictionary using a for loop, e.g.:</p> <pre><code>Dictionary&lt;string, string&gt; test = new Dictionary&lt;string, string&gt;(); int dictionaryLength = test.Count(); for (int i = 0; i &lt; dictionaryLength; i++) { test[test.ElementAt(i).Key] = "Some new content"; } </code></pre> <p>Be weary though, that if you're also adding to the Dictionary, you must increment dictionaryLength (or decrement it if you move elements) appropriately.</p> <p>Depending on what exactly you're doing, and if order matters, you may wish to use a SortedDictionary instead.</p> <p>You could extend this by updating dictionaryLength explicitly by recalling test.Count() at each iteration, and also use an additional list containing a list of keys you've already modified and so on and so forth if there's a danger of missing any, it really depends what you're doing as much as anything and what your needs are.</p> <p>You can further get a list of keys using test.Keys.ToList(), that option would work as follows:</p> <pre><code>Dictionary&lt;string, string&gt; test = new Dictionary&lt;string, string&gt;(); List&lt;string&gt; keys = test.Keys.ToList(); foreach (string key in keys) { test[key] = "Some new content"; } IEnumerable&lt;string&gt; newKeys = test.Keys.ToList().Except(keys); if(newKeys.Count() &gt; 0) // Do it again or whatever. </code></pre> <p>Note that I've also shown an example of how to find out whether any new keys were added between you getting the initial list of keys, and completing iteration such that you could then loop round and handle the new keys.</p> <p>Hopefully one of these options will suit (or you may even want to mix and match- for loop on the keys for example updating that as you go instead of the length) - as I say, it's as much about what precisely you're trying to do as much as anything.</p>
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    1. POUsing the Concurrent Dictionary - Thread Safe Collection Modification
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    1. COWith a regular for loop, it's possible you iterate the same key twice (or more, according to the number of deletes/adds). Imagine the following scenario: your i has value 5 (of 10), when suddenly an element is added. Now dictionary doesn't guarantee order of elements, so it's possible the item is added before your element. Now in the next iteration you're using the same key/value pair!
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    2. COIndeed, that's the scenario in which as I say you'd probably need a SortedDictionary, or some kind of tracking (i.e. a list of already iterated elements) but again it depends entirely on what he's trying to achieve - in some scenarios you may not care about this and simply want to get through what you can in the collection without the exception. It's very scenario specific as to what the "best" option really is.
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