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    <p>Facts: Keyboard has keys. Some keys represent numbers and some do not.</p> <p>Problem (rephrased): Yield a numeric value represented by a key, if the key represents a number.</p> <p>To solve the problem it is necessary to know which keys (out of set of all keys) represent numbers as well as exact numeric value each (number) key represents.</p> <p>To my knowledge there is no an easy way to get such a mapping from the framework.</p> <p>Note: The fact D0-D9 and NumPad0-NamPad9 are sequential in the Keys enum is accidental and relying on these values being ordered sequentially is unfounded.</p> <p>So solution would be:</p> <ol> <li>Determine if given key represents a number.</li> <li>Return numeric value of the key if key represents a number.</li> </ol> <hr> <pre><code>private static readonly IDictionary&lt;Keys, int&gt; NumericKeys = new Dictionary&lt;Keys, int&gt; { { Keys.D0, 0 }, { Keys.D1, 1 }, { Keys.D2, 2 }, { Keys.D3, 3 }, { Keys.D4, 4 }, { Keys.D5, 5 }, { Keys.D6, 6 }, { Keys.D7, 7 }, { Keys.D8, 8 }, { Keys.D9, 9 }, { Keys.NumPad0, 0 }, { Keys.NumPad1, 1 }, { Keys.NumPad2, 2 }, { Keys.NumPad3, 3 }, { Keys.NumPad4, 4 }, { Keys.NumPad5, 5 }, { Keys.NumPad6, 6 }, { Keys.NumPad7, 7 }, { Keys.NumPad8, 8 }, { Keys.NumPad9, 9 } }; private int? GetKeyNumericValue(KeyEventArgs e) { if (NumericKeys.ContainsKey(e.KeyCode)) return NumericKeys[e.KeyCode]; else return null; } </code></pre> <p>Arguably, not the simplest solution, but the one that models the solution closely.</p>
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    1. POHow do I convert a "Keys" enum value to an "int" character in C#?
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