StackOverflow2013

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primarykey
Id
18340577
data
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0
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0
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3
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2013-08-20T16:43:36.213
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2013-08-20T18:23:10.947
LastEditDate
2017-05-23T10:25:27.643
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-1
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1715579
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18340542
PostTypeId
2
Score
0
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text
Body
In addition to overloading <code>==</code> and <code>Equals</code>, make sure you override <a href="http://msdn.microsoft.com/en-us/library/system.object.gethashcode%28v=vs.110%29.aspx" rel="nofollow noreferrer"><code>GetHashCode</code></a> with a suitable hash function. In particular, see this specification from the documentation: <blockquote> <ul> <li>If two objects compare as equal, the <code>GetHashCode</code> method for each object must return the same value. However, if two objects do not compare as equal, the <code>GetHashCode</code> methods for the two objects do not have to return different values.</li> <li>The <code>GetHashCode</code> method for an object must consistently return the same hash code as long as there is no modification to the object state that determines the return value of the object's Equals method. Note that this is true only for the current execution of an application, and that a different hash code can be returned if the application is run again.</li> <li>For the best performance, a hash function should generate an even distribution for all input, including input that is heavily clustered. An implication is that small modifications to object state should result in large modifications to the resulting hash code for best hash table performance.</li> <li>Hash functions should be inexpensive to compute.</li> <li>The <code>GetHashCode</code> method should not throw exceptions.</li> </ul> </blockquote> <hr> I agree with <a href="https://stackoverflow.com/a/18341416/1715579">Jon Skeet's suspicion</a> that you're somehow unintentionally modifying <code>UserID</code> property after it's added as a key. But since the only property that's important for testing equality in <code>MyObject</code> is <code>UserID</code> (and therefore that's the only property that the <code>Dictionary</code> cares about), I'd recommend refactoring your code to use a simple <code>Dictionary<ulong, IMyInterface></code> instead: <pre><code>Dictionary<ulong, IMyInterface> dict = new Dictionary<string, IMyInterface>(); ulong userID = dict.Keys.First(); var value = dict[userID]; </code></pre>
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