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POWhy do I get a System.ArgumentException when invoking Sort(IComparer) on a List?
 

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  1. POWhy do I get a System.ArgumentException when invoking Sort(IComparer) on a List?
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    <p>I sort a List with my own IComparer and this works just fine when running the application (XNA game) for more than an hour. But then, suddenly, I sometimes get the following error when invoking the sort-method with my custom Comparer:</p> <pre><code>An unhandled exception of type 'System.ArgumentException' occured in mscorlib.dll Additional Information: ArgumentException </code></pre> <p>This is the line where the exception is thrown:</p> <pre><code>List&lt;Continent&gt; markets = new List&lt;Continent&gt;(); // filling the markets list ... markets.Sort(new MarketCostCoverComparer(this)); </code></pre> <p>and this is my class implementing IComparer interface:</p> <pre><code>class MarketCostCoverComparer : IComparer&lt;Continent&gt; { private Player player; public MarketCostCoverComparer(Player player) { this.player=player; } public int Compare(Continent c1, Continent c2) { if(player.GetCostCovering(c1)&lt;player.GetCostCovering(c2)) { return +1; } else if(player.GetCostCovering(c1)==player.GetCostCovering(c2)) { return 0; } else { return -1; } } } </code></pre> <p>Here some methods that are linked to the comparer...:</p> <pre><code>public float GetCostCovering(Continent continent) { // cover&lt;1 =&gt; bad | cover&gt;1 =&gt; good if(GetOilfieldTheoreticOutput(continent.Type, true)&lt;continent.Economy.CurrentDemand) { return ((float)((GetOilfieldTheoreticOutput(continent.Type, true)*continent.Economy.CurrentPrice)))/(float)GetOilfieldCosts(continent.Type, true); } else { return ((float)((continent.Economy.CurrentDemand*continent.Economy.CurrentPrice)))/(float)GetOilfieldCosts(continent.Type, true); } } public int GetOilfieldTheoreticOutput(ContinentType continent, bool drilled) { int total = 0; foreach(Oilfield oilfield in worldmap.Continents[(int)continent].Oilfields) { if(oilfield.Owner==this &amp;&amp; oilfield.Drilled==drilled) { total+=oilfield.TheoreticOutput; } } return total; } public int GetOilfieldCosts(ContinentType continent, bool drilled) { int total = 0; foreach(Oilfield oilfield in worldmap.Continents[(int)continent].Oilfields) { if(oilfield.Owner==this &amp;&amp; oilfield.Drilled==drilled) { total+=oilfield.Costs; } } return total; } </code></pre> <p>Here the screenshot of the exception:</p> <p><img src="https://i.stack.imgur.com/LksNk.png" alt="An unhandled exception of type &#39;System.ArgumentException&#39; occured in mscorlib.dll"></p> <p>Here a closer look of the Locals/Stack-Trace (this is an old screenshot, but I will try to reproduce this exception within the next hours, so that I can expand the trace):</p> <p><img src="https://i.stack.imgur.com/I0jZj.png" alt="enter image description here"></p>
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    1. USsalocinx
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      1. POWhy do I get a System.ArgumentException when invoking Sort(IComparer) on a List?
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      1. POWhy do I get a System.ArgumentException when invoking Sort(IComparer) on a List?
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      1. POWhy do I get a System.ArgumentException when invoking Sort(IComparer) on a List?
      1. USStefan
      1. VTFavorite
    1. COCan you supply the stacktrace of the exception?
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      1. POWhy do I get a System.ArgumentException when invoking Sort(IComparer) on a List?
      1. USFredrik Mörk
    2. CO1) post the inner exception, if there is one, or at least the stack trace 2) post the GetCostCovering() method
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      1. POWhy do I get a System.ArgumentException when invoking Sort(IComparer) on a List?
      1. USFilip
    3. COUnfortunately there's no stack trace, since Visual Studio just pops a message box up with the two lines mentioned above. The GetCostCovering() methods just follows ...
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      1. USsalocinx
 

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