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    <p>The problem is that the addition <em>is</em> being done as short + short (which presumably exists in IL even if it doesn't exist in C#) - and then the conversion is performed separately. This is shown by this complete program - even without the conversion, the result is -32768:</p> <pre><code>using System; using System.Linq.Expressions; class Test { static void Main(string[] args) { short left = short.MaxValue; short right = 1; var a = Expression.Constant(left); var b = Expression.Constant(right); var sum = Expression.Add(a, b); var convert = Expression.ConvertChecked(sum, typeof(short)); var convertLambda = Expression.Lambda&lt;Func&lt;short&gt;&gt;(convert); var convertFunc = convertLambda.Compile(); Console.WriteLine("Conversion: {0}", convertFunc()); var sumLambda = Expression.Lambda&lt;Func&lt;short&gt;&gt;(sum); var sumFunc = sumLambda.Compile(); Console.WriteLine("Sum: {0}", sumFunc()); } } </code></pre> <p>If you make it do an int + int addition and then the conversion, it will throw an overflow exception:</p> <pre><code>using System; using System.Linq.Expressions; class Test { static void Main(string[] args) { short left = short.MaxValue; short right = 1; var a = Expression.Constant((int) left); var b = Expression.Constant((int) right); var sum = Expression.Add(a, b); var convert = Expression.ConvertChecked(sum, typeof(short)); var convertLambda = Expression.Lambda&lt;Func&lt;short&gt;&gt;(convert); var convertFunc = convertLambda.Compile(); Console.WriteLine("Conversion: {0}", convertFunc()); var sumLambda = Expression.Lambda&lt;Func&lt;int&gt;&gt;(sum); var sumFunc = sumLambda.Compile(); Console.WriteLine("Sum: {0}", sumFunc()); } } </code></pre> <p>I don't know why <code>AddChecked</code> doesn't work though... that looks like a bug :( It's possible that using <a href="http://msdn.microsoft.com/en-us/library/bb336728.aspx" rel="nofollow noreferrer">the overload which allows the Method to specified would work</a>, but I'm not sure...</p>
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    1. COExcellent explanation.
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