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POYield keyword behavior in C# 2.0
 

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    <p>In a method I yield a custom object which I reuse. later for yielding again. </p> <pre><code>private IEnumerable&lt;DistributorMonthlyComparisonData&gt; ExtractMonthlyAggregate(String CSVFilepath) { DistributorMonthlyComparisonData unitData = new DistributorMonthlyComparisonData(); while (!reader.EndOfStream) { if(something){ // fill unitData } else{ yield return unitData; } } } </code></pre> <p>In another object in my program I call said method in this way:</p> <pre><code>List&lt;DistributorMonthlyComparisonData&gt; distribList = new List&lt;DistributorMonthlyComparisonData&gt;(); foreach (DistributorMonthlyComparisonData result in ExtractMonthlyAggregate(percorso)) { distribList.Add(result); } </code></pre> <p>If I don't create in the yielding method, after each yield, a new object</p> <pre><code>unitData = new DistributorMonthlyComparisonData(); </code></pre> <p>All I get is a List of identical objects.</p> <p>I am wondering: is this because unitData is being passed as a reference and thus the List is merely a List of references to the same identical object? Creating a new unitData() every time changes the hash of the unitData object being passed?</p> <p>Please enlighten me. :)</p> <p><strong>EDIT</strong> I am interested in <em>why</em> this is happening. I used to think that the framework is supposed to do copy-on-write on objects, so basically yielding one object then modifying its properties and then yielding it again should result in two different objects being added to the list.</p>
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