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POHow to avoid redundant List using LINQ
 

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    <p>I have a Report object that has Recipients property (of String datatype). The Recipients property will hold all the recipients’ email address in <code>comma separated string</code>. I need to create a “<strong>Collection</strong>” of Email objects from the comma separated string. I have the following code that uses a <strong>List of string</strong> to get the email address first. Then I create a collection of email objects. </p> <p>Is there a better way to avoid the redundant List and Collection using <code>LINQ</code>?</p> <pre><code> Report report = new Report(); report.Recipients = "test@test.com, demo@demo.com"; List&lt;string&gt; emailAddressList = new List&lt;string&gt;( report.Recipients.Split(',') ); Collection&lt;Email&gt; emailObjectCollection = new Collection&lt;Email&gt;(); foreach (string emailAddress in emailAddressList) { Email email = new Email(); email.EmailAddress = emailAddress; emailObjectCollection.Add(email); } </code></pre> <p><strong>References</strong>:</p> <ol> <li><a href="https://stackoverflow.com/questions/13247001/better-code-for-avoiding-one-dictionary-case-sensitivity-issue">Better code for avoiding one dictionary - Case Sensitivity Issue</a></li> <li><a href="https://stackoverflow.com/questions/1606679/remove-duplicates-in-the-list-using-linq">Remove duplicates in the list using linq</a></li> <li><a href="https://stackoverflow.com/questions/5596604/using-linq-to-find-duplicates-across-multiple-properties">Using LINQ to find duplicates across multiple properties</a></li> <li><a href="https://stackoverflow.com/questions/1232108/c-difference-between-listt-and-collectiont-ca1002-do-not-expose-generic">C#: Difference between List&lt;T&gt; and Collection&lt;T&gt; (CA1002, Do not expose generic lists)</a></li> </ol> <blockquote> <p><strong>CA1002</strong>: Do not expose generic lists. System.Collections.Generic.List is a generic collection designed for performance not inheritance and, therefore, does not contain any virtual members. <a href="http://msdn.microsoft.com/en-us/library/ms182142(v=vs.80).aspx" rel="nofollow noreferrer">http://msdn.microsoft.com/en-us/library/ms182142(v=vs.80).aspx</a></p> </blockquote>
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    1. COWhy do you need to use `Collection<T>` at all? It's designed to be a *base* class... what advantage does it have for you over `List<T>`?
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    2. CO@JonSkeet I need to return the collection in a publicly exposed method. If I use `List`, I will get `CA1002` warning in code analysis. Is it a bad idea to return a `Collection`? If yes, how should I modify the code to use collection in proper way?
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    3. CO@Lijo Just don't use `Collection` at all. Create a `List` and return a `List`.
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