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    <ul> <li>the <code>Reset()</code> method on <code>IEnumerator&lt;T&gt;</code> was a mistake (for iterator blocks, the language spec even <em>demands</em> that this throws an exception)</li> <li>the reflection methods that return arrays were, in Eric's view, <a href="http://blogs.msdn.com/ericlippert/archive/2008/09/22/arrays-considered-somewhat-harmful.aspx" rel="noreferrer">a mistake</a></li> <li>array covariance was and remains an oddity; at least in C# 4.0 / .NET 4.0 this is done correctly for <code>IEnumerable[&lt;T&gt;]</code></li> <li><code>ApplicationException</code> rather fell out of favor - was that a mistake?</li> <li>synchronized collections - a nice idea, but not necessarily useful in reality: you usually need to synchronize <em>multiple</em> operations (<code>Contains</code>, then <code>Add</code>), so a collection that synchronizes distinct operations isn't all that useful</li> <li>more use could have been made of the <code>using</code>/<code>lock</code> pattern - perhaps allowing them to share a re-usable (extensible?) syntax; you can simulate this by returning <code>IDisposable</code> and using <code>using</code>, but it could have been clearer</li> <li>iterator blocks : no simple way of checking arguments ahead-of-time (rather than lazily). Sure, you can write two chained methods, but that is ugly</li> <li>simpler immutability would be nice; C# 4.0 helps <a href="http://marcgravell.blogspot.com/2008/11/immutability-and-optional-parameters.html" rel="noreferrer">a bit</a>, but not quite enough</li> <li>no "this ref-type parameter cannot be null" support - although contracts (in 4.0) help with this somewhat. But syntax like <code>Foo(SqlConnection! connection)</code> (that injects a null-check / <code>throw</code>) would be nice (contrast to <code>int?</code> etc)</li> <li>lack of support of operators and non-default constructors with generics; C# 4.0 solves this a bit with <code>dynamic</code>, or you can enable it <a href="http://www.pobox.com/~skeet/csharp/miscutil/usage/genericoperators.html" rel="noreferrer">like this</a></li> </ul> <hr> <ul> <li>the iterator variable being declared <em>outside</em> the while in the <code>foreach</code> expansion, meaning that anon-methods/lambdas capture the single variable, rather than one per iteration (painful with threading/async/etc)</li> </ul>
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    1. POC# (.NET) Design Flaws
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    1. USMarc Gravell
    1. USMarc Gravell
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    1. COIEnumerable != IEnumerable<object> is indeed odd
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    2. COWell, the IEnumerable thing is a 1.1 hangover; you can use .Cast<object>() with LINQ, at least
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      1. USMarc Gravell
    3. COThe BCL folks said that `ApplicationException` was a mistake - not useful like they hoped. They also said that `System.Exception` should have been `abstract`.
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      1. USJay Bazuzi
 

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