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POC# - How to override GetHashCode with Lists in object
 

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  1. POC# - How to override GetHashCode with Lists in object
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    <p>I am trying to create a "KeySet" to modify UIElement behaviour. The idea is to create a special function if, eg. the user clicks on an element while holding a. Or ctrl+a.</p> <p>My approach so far, first lets create a container for all possible modifiers. If I would simply allow a single key, it would be no problem. I could use a simple Dictionary, with</p> <pre><code>Dictionary&lt;Keys, Action&gt; _specialActionList </code></pre> <ul> <li>If the dictionary is empty, use the default action.</li> <li>If there are entries, check what action to use depending on current pressed keys</li> </ul> <p>And if I wasn't greedy, that would be it... Now of course, I want more. I want to allow multiple keys or modifiers. So I created a <strong>wrapper class, wich can be used as Key to my dictionary.</strong></p> <p>There is an obvious problem when using a more complex class. Currently two different instances would create two different key, and thereby he would never find my function (see code to understand, really obvious)</p> <p>Now I checked this post: <a href="https://stackoverflow.com/questions/638761/c-gethashcode-override-of-object-containing-generic-array">GetHashCode override of object containing generic array</a> which helped a little.</p> <p><strong>But my question is, is my basic design for the class ok. Should I use a hashset to store the modifier and normal keyboardkeys (instead of Lists). And If so, how would the GetHashCode function look like?</strong></p> <p>I know, its a lot of code to write (boring hash functions), some tips would be sufficient to get me started. Will post tryouts here...</p> <p>And here comes the code so far, the Test obviously fails...</p> <pre><code> public class KeyModifierSet { private readonly List&lt;Key&gt; _keys = new List&lt;Key&gt;(); private readonly List&lt;ModifierKeys&gt; _modifierKeys = new List&lt;ModifierKeys&gt;(); private static readonly Dictionary&lt;KeyModifierSet, Action&gt; _testDict = new Dictionary&lt;KeyModifierSet, Action&gt;(); public static void Test() { _testDict.Add(new KeyModifierSet(Key.A), () =&gt; Debug.WriteLine("nothing")); if (!_testDict.ContainsKey(new KeyModifierSet(Key.A))) throw new Exception("Not done yet, help :-)"); } public KeyModifierSet(IEnumerable&lt;Key&gt; keys, IEnumerable&lt;ModifierKeys&gt; modifierKeys) { foreach (var key in keys) _keys.Add(key); foreach (var key in modifierKeys) _modifierKeys.Add(key); } public KeyModifierSet(Key key, ModifierKeys modifierKey) { _keys.Add(key); _modifierKeys.Add(modifierKey); } public KeyModifierSet(Key key) { _keys.Add(key); } } </code></pre>
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    1. USChristian Ruppert
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    1. COWhat programming language are you talking about?
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      1. POC# - How to override GetHashCode with Lists in object
      1. USJonathan Feinberg
    2. COYou might want to add a tag indicating what language you're asking about.
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      1. POC# - How to override GetHashCode with Lists in object
      1. USLaurence Gonsalves
    3. COAnd what the heck is your question!?
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      1. POC# - How to override GetHashCode with Lists in object
      1. USJonathan Feinberg
 

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