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    <p>You can't, basically. When you create an array, it's always initially populated with the default value for the type - which for a class is always a null reference. For <code>int</code> it's 0, for <code>bool</code> it's false, etc.</p> <p>(If you use an array initializer, that will create the "empty" array and <em>then</em> populate it with the values you've specified, of course.)</p> <p>There are various ways of populating the array by calling the constructor - I would <em>probably</em> just use a foreach loop myself. Using LINQ with Enumerable.Range/Repeat feels a little forced.</p> <p>Of course, you could always <em>write</em> your own population method, even as an extension method:</p> <pre><code>public static T[] Populate&lt;T&gt;(this T[] array, Func&lt;T&gt; provider) { for (int i = 0; i &lt; array.Length; i++) { array[i] = provider(); } return array; } </code></pre> <p>Then you could use:</p> <pre><code>Sample[] samples = new Sample[100].Populate(() =&gt; new Sample()); </code></pre> <p>What I like about this solution:</p> <ul> <li>It's still a single expression, which can be useful in various scenarios</li> <li>It doesn't introduce concepts you don't actually want (like repeating a single value or creating a range)</li> </ul> <p>Of course you could add more options:</p> <ul> <li>An overload which takes a <code>Func&lt;int, T&gt;</code> instead of a <code>Func&lt;T&gt;</code>, passing the index to the provider</li> <li>A non-extension method which creates the array <em>and</em> populates it</li> </ul>
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    1. USJon Skeet
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    1. COI liked this solution most. :-) Reusable Method. :-)
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      1. USNawaz
    2. COAnother useful overload is replace `, Func<T> provider)` with `) where T : new()` and then you don't need to pass in a delegate at all if you are just using the default constructor (you will also need to replace `provider()` with `new T()`).
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      1. USScott Chamberlain
 

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