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    <p><code>AddSomeNodes</code> is not creating an instance of <code>List&lt;TreeNode&gt;</code> because that syntax is a collection initializer (therefore it is not assigning to <code>Nodes</code> meaning it doesn't break the <code>readonly</code> contract), the compiler actually translates the collection initializer into calls to <code>.Add</code>.</p> <p>The <code>AddSomeOtherNodes</code> call actually tries to re-assign the value, but it is <code>readonly</code>. This is also the object initializer syntax, which translates into simple property calls. This property does not have a setter, so that call generates a compiler error. Attempting to add a setter that sets the readonly value will generate another compiler error because it is marked <code>readonly</code>.</p> <p><a href="http://msdn.microsoft.com/en-us/library/bb384062.aspx" rel="nofollow">From MSDN</a>:</p> <blockquote> <p>By using a collection initializer you do not have to specify multiple calls to the Add method of the class in your source code; the compiler adds the calls.</p> </blockquote> <p>Also, just to clarify, there are <strong><em>no</em></strong> anonymous types in play in your code - it is all initializer syntax.</p> <p><hr/> Unrelated to your question, but in the same area.</p> <p>Interestingly, the <code>Nodes = { new TreeNode() }</code> syntax doesn't work with a local member, it only seems to work when it is nested inside an object initializer or during object assignment:</p> <pre><code>List&lt;int&gt; numbers = { 1, 2, 3, 4 }; // This isn't valid. List&lt;int&gt; numbers = new List&lt;int&gt; { 1, 2, 3, 4 }; // Valid. // This is valid, but will NullReferenceException on Numbers // if NumberContainer doesn't "new" the list internally. var container = new NumberContainer() { Numbers = { 1, 2, 3, 4 } }; </code></pre> <p>The MSDN documentation doesn't seem to have any clarification on this.</p>
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    1. USAdam Houldsworth
    1. USAdam Houldsworth
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    1. CO@Downvoter Why the downvote? My observation about the OPs situation is accurate according to the documentation and my own testing. Not to mention all of the other answers.
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      1. USAdam Houldsworth
    2. COI just got a down vote as well!
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      1. USMBen
    3. COThanks for providing such a complete and concise answer so quickly! You are completely right that I made a mistake in calling it an anonymous type. This behavior makes sense when considering it is collection initialization syntax, not assignment of an anonymous type. It is sometimes difficult to disambiguate these concepts mentally because they are so syntactically alike. Thanks!
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