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The best solution is usually to use the <a href="http://www.google.ca/url?sa=t&source=web&cd=1&ved=0CBcQFjAA&url=http://msdn.microsoft.com/en-us/library/wdka673a.aspx&rct=j&q=removeall%20msdn&ei=Km5WTqv9Jenh0QHG_f2kDA&usg=AFQjCNFYUfX-eMDHsuprtvWJy8Sdvvs0EA&sig2=KX9Y1vppeBpmNWTsILfDkQ&cad=rja"><code>RemoveAll()</code></a> method: <pre><code>myList.RemoveAll(x => x.SomeProp == "SomeValue"); </code></pre> Or, if you need certain elements removed: <pre><code>MyListType[] elems = new[] { elem1, elem2 }; myList.RemoveAll(x => elems.Contains(x)); </code></pre> This assume that your loop is solely intended for removal purposes, of course. If you do need to additional processing, then the best method is usually to use a <code>for</code> or <code>while</code> loop, since then you're not using an enumerator: <pre><code>for (int i = myList.Count - 1; i >= 0; i--) { // Do processing here, then... if (shouldRemoveCondition) { myList.RemoveAt(i); } } </code></pre> Going backwards ensures that you don't skip any elements. Response to Edit: If you're going to have seemingly arbitrary elements removed, the easiest method might be to just keep track of the elements you want to remove, and then remove them all at once after. Something like this: <pre><code>List<int> toRemove = new List<int>(); foreach (var elem in myList) { // Do some stuff // Check for removal if (needToRemoveAnElement) { toRemove.Add(elem); } } // Remove everything here myList.RemoveAll(x => toRemove.Contains(x)); </code></pre>
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1. POIntelligent way of removing items from a List<T> while enumerating in C#
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1. CORegarding your response: I need to remove the items instantly during the processing of that item not after the whole loop has been processed. The solution I'm using is to NULL any items that I want to delete instantly and delete them afterwards. This is not an ideal solution as I have to check for NULL all over the place, but it DOES work.
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