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POHow to find duplicates in a List<T> quickly, and update the original collection
 

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    <p>Let me start by saying I've read these questions: <a href="https://stackoverflow.com/questions/223400/checking-for-duplicates-in-a-complex-object-using-linq-or-lamda-expression">1</a> &amp; <a href="https://stackoverflow.com/questions/454601/how-to-count-duplicates-in-list-with-linq">2</a>, and I understand that I can write the code to find duplicates in my List, but my problem is I want to update the original list not just query and print the duplicates.</p> <p>I know I can't update the collection the query returns as it's not a view, it's an anonymous type <code>IEnumerable&lt;T&gt;</code>.</p> <p>I want to be able to find duplicates in my list, and mark a property I've created called <code>State</code> which is used later in the application.</p> <p>Has anyone ran into this problem and can you point me in the right direction?</p> <p>p.s. The approach I'm using ATM is a bubble sort type loop to go through the list item by item and compare key fields. Obviously this isn't the fastest method.</p> <p>EDIT:</p> <p>In order to consider an item in the list a "duplicate", there are three fields which must match. We'll call them Field1, Field2, and Field3</p> <p>I have an overloaded Equals() method on the base class which compares these fields.</p> <p>The only time I skip an object in my <code>MarkDuplicates()</code> method is if the objects state is <code>UNKNOWN</code> or <code>ERROR</code>, otherwise, I test it.</p> <p>Let me know if you need more details.</p> <p>Thanks again!</p>
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