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    <p>Ok, so I figured out how to write my DSL using an additional expression builder. This is how I wanted my DSL to read:</p> <pre><code>var myPreferredCoffeeFromStarbucks = Coffee.Make.WithCream().PourIn( x =&gt; { x.ShotOfExpresso().AtTemperature(100); x.ShotOfExpresso().AtTemperature(100).OfPremiumType(); } ).ACupSizeInOunces(16); </code></pre> <p>Here's my passing test:</p> <pre><code>[TestFixture] public class CoffeeTests { [Test] public void Can_Create_A_Caramel_Macchiato() { var myPreferredCoffeeFromStarbucks = Coffee.Make.WithCream().PourIn( x =&gt; { x.ShotOfExpresso().AtTemperature(100); x.ShotOfExpresso().AtTemperature(100).OfPremiumType(); } ).ACupSizeInOunces(16); Assert.IsTrue(myPreferredCoffeeFromStarbucks.expressoExpressions[0].ExpressoShots.Count == 2); Assert.IsTrue(myPreferredCoffeeFromStarbucks.expressoExpressions[0].ExpressoShots.Dequeue().IsOfPremiumType == true); Assert.IsTrue(myPreferredCoffeeFromStarbucks.expressoExpressions[0].ExpressoShots.Dequeue().IsOfPremiumType == false); Assert.IsTrue(myPreferredCoffeeFromStarbucks.CupSizeInOunces.Equals(16)); } } </code></pre> <p>And here's my CoffeeExpressionBuilder DSL class(s):</p> <pre><code>public class Coffee { public List&lt;ExpressoExpressionBuilder&gt; expressoExpressions { get; private set; } public bool HasCream { get; private set; } public int CupSizeInOunces { get; private set; } public static Coffee Make { get { var coffee = new Coffee { expressoExpressions = new List&lt;ExpressoExpressionBuilder&gt;() }; return coffee; } } public Coffee WithCream() { HasCream = true; return this; } public Coffee ACupSizeInOunces(int ounces) { CupSizeInOunces = ounces; return this; } public Coffee PourIn(Action&lt;ExpressoExpressionBuilder&gt; action) { var expression = new ExpressoExpressionBuilder(); action.Invoke(expression); expressoExpressions.Add(expression); return this; } } public class ExpressoExpressionBuilder { public readonly Queue&lt;ExpressoExpression&gt; ExpressoShots = new Queue&lt;ExpressoExpression&gt;(); public ExpressoExpressionBuilder ShotOfExpresso() { var shot = new ExpressoExpression(); ExpressoShots.Enqueue(shot); return this; } public ExpressoExpressionBuilder AtTemperature(int temp) { var recentlyAddedShot = ExpressoShots.Peek(); recentlyAddedShot.Temperature = temp; return this; } public ExpressoExpressionBuilder OfPremiumType() { var recentlyAddedShot = ExpressoShots.Peek(); recentlyAddedShot.IsOfPremiumType = true; return this; } } public class ExpressoExpression { public int Temperature { get; set; } public bool IsOfPremiumType { get; set; } public ExpressoExpression() { Temperature = 0; IsOfPremiumType = false; } } </code></pre> <p>Any and all suggestions are welcome.</p>
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