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    <p><strike>Yes</strike> You can do it like this.</p> <pre class="lang-vb prettyprint-override"><code>Dim WorkingDict As New HybridDictionary WorkingDict.Add("k1", "v1") WorkingDict.Add("k2", "v2") Parallel.ForEach(WorkingDict.Cast(Of Object), Sub(DictObject As KeyValuePair(Of String, String)) ' do something End Sub) </code></pre> <p>You need to use the <code>IEnumerable.Cast</code> operator because <code>Parallel.Foreach</code> <a href="http://blogs.msdn.com/b/pfxteam/archive/2010/03/02/9971804.aspx" rel="nofollow noreferrer">only works with generic collections</a>. <code>HybridDictionary</code> is a non-generic collection.</p> <p>But keep in mind that this is a very simple [empty] example and more complex parallel operations require many considerations such as locking shared resources etc. You could always consider using a <code>System.Collections.ConcurrentDictionary</code>, which handles locking shared resources if needed. <a href="https://stackoverflow.com/questions/7028919/concurrentdictionary-addorupdate">A SO post on this</a>. Example:</p> <pre class="lang-vb prettyprint-override"><code>Dim WorkingDict As New ConcurrentDictionary(Of String, String) ' ConcurrentDictionary has no Add operator, so to replicate it, use AddOrUpdate ' and just pass the same value whether it is being added or updating WorkingDict.AddOrUpdate("key1", "value1", Function(key, oldvalue) "value1") WorkingDict.AddOrUpdate("key2", "value2", Function(key, oldvalue) "value2") Parallel.ForEach(WorkingDict, Sub(DictObject as DictionaryEntry) ' do something End Sub) </code></pre>
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    1. POHow to convert a for each dictionary loop to a parallel foreach loop
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    1. COI'm getting a "Option Strict On requires each lambda expression to be declared with an 'As' clause if it's type cannot be inferred." error with the (DictObject).
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    2. COEdited to satisfy your Option Strict On (I don't have the IDE in front of me, forgive me)
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    3. COThanks for your help Dan.....I'm now getting an overload resolution failed......
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