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copied!<p>Based on your comment, you haven't implemented GetHashCode. I'm amazed that the class works at all in a dictionary, unless you're always requesting the <em>identical</em> key that you put in. I would suggest an implementation of something like:</p> <pre><code>public override int GetHashCode() { int hash = 17; hash = hash * 23 + UpperLimit.GetHashCode(); hash = hash * 23 + LowerLimit.GetHashCode(); return hash; } </code></pre> <p>That <em>assumes</em> <code>Double.GetHashCode()</code> gives a consistent value for NaN. There are many values of NaN of course, and you <em>may</em> want to special case it to make sure they all give the same hash.</p> <p>You should also override the <code>Equals</code> method inherited from <code>Object</code>:</p> <pre><code>public override bool Equals(Object other) { return other != null && other.GetType() == GetType() && Equals((NumericalRange) other); } </code></pre> <p>Note that the type check can be made more efficient by using <code>as</code> if you seal your class. Otherwise you'll get interesting asymmetries between <code>x.Equals(y)</code> and <code>y.Equals(x)</code> if someone derives another class from yours. Equality becomes tricky with inheritance.</p> <p>You should <em>also</em> make your fields private, exposing them only as propertes. If this is going to be used as a key in a dictionary, I <em>strongly</em> recommend that you make them readonly, too. Changing the contents of a key when it's used in a dictionary is likely to lead to it being "unfindable" later.</p>

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