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POInvalidOperationException in release-mode of visual studio since using .Net 4.0
 

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  1. POInvalidOperationException in release-mode of visual studio since using .Net 4.0
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    <p>I have some trouble to port an existing .NET 3.5 Application to .NET 4.0. The Code isn't written by myself so I didn´t know in detail why the things are as they are.</p> <p>This is the Situation: Code works fine if the application is started from Visual Studio (Release or Debug-Mode doesn’t matter) and also if the application is started form Debug-folder The Problem is the Release-deploy, because is doesn’t work well since 4.0 (and also in 4.5) :-/</p> <p>This is the initial call:</p> <pre><code>someObject.Text = Elements.GetElement(Int16.Parse(cb1.Text)); </code></pre> <p>And Here is the code:</p> <pre><code>public class Elements : EnumBase&lt;int, Elements&gt; { public static readonly Elements Element1 = Create("Number 0", 0); public static readonly Elements Element2 = Create("Number 1", 1); private static Elements Create(string text, int value) { return new Elements() { text = text, value = value }; } public static String GetElement(int id) { // The Following Code safes the day and let the release deploy work fine. // It doesn´t matter if the condition becomes true or not to runtime. /* if (id == 999999999) { Elements el = Element1; } */ // Release deploy works also fine if you do the following line in a loop instead of linq. return BaseItemList.Single(v =&gt; v.Value == id).Text; } } [Serializable()] public class EnumBase&lt;T, E&gt; : IEqualityComparer&lt;E&gt; where E : EnumBase&lt;T, E&gt; { private static readonly List&lt;E&gt; list = new List&lt;E&gt;(); protected string text; protected T value; protected static IList&lt;E&gt; BaseItemList { get { return list.Distinct(new EnumBase&lt;T, E&gt;(false)).ToList(); } } protected EnumBase() { list.Add(this as E); } /// &lt;summary&gt; /// Constructor for distinct to avoid empty elements in the list /// &lt;/summary&gt; private EnumBase(bool egal) {} public string Text { get { return text; } } public T Value { get { return value; } } #region IEqualityComparer&lt;E&gt; Member // ... #endregion } </code></pre> <p>The key is <code>return BaseItemList.Single(v =&gt; v.Value == id).Text;</code>. It throws a <code>InvalidOperationException</code>, because in Release <code>public static readonly Elements Element1 = Create("Number 0", 0);</code> and <code>public static readonly Elements Element2 = Create("Number 1", 1);</code> aren't ready. In the moment of the Exception is BaseItemList empty (BaseItemList.Count = 0). I am not sure why this happened in release form bin-folder and not in release out of visual studio. For tests I deactivated "Optimize code" in project-properties but it doesn’t help.</p> <p>Surely the construct isn't the best, but I want to know what is different in .Net 4.0 that bring the code to flatter.</p> <p>Thanks for help</p>
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    1. USMicha
    1. USMicha
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      1. POInvalidOperationException in release-mode of visual studio since using .Net 4.0
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      1. POInvalidOperationException in release-mode of visual studio since using .Net 4.0
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      1. VTUpMod
    1. COA variable GetHashCode is often dangerous. Could you post the full stack frame?
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      1. POInvalidOperationException in release-mode of visual studio since using .Net 4.0
      1. USSimon Mourier
    2. COHi Simon, in wich reason is GetHashCode dangerous? ************** Exception Text ************** System.InvalidOperationException: Sequence contains no matching element at System.Linq.Enumerable.Single[TSource](IEnumerable`1 source, Func`2 predicate) at Test.Form1.button1_Click(Object sender, EventArgs e) in d:\test\Projects\Test\Test\Form1.cs:line 16 at System.Windows.Forms.Button.OnMouseUp(MouseEventArgs mevent) at System.Windows.Forms.Control.WmMouseUp(Message& m, MouseButtons button, Int32 clicks) at System.Windows.Forms.Control.WndProc(Message& m) ...
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      1. POInvalidOperationException in release-mode of visual studio since using .Net 4.0
      1. USMicha
    3. COI didn't say GetHashCode is dangerous, I said a "variable GetHashCode", it should not vary during the lifetime of the object. see this: http://stackoverflow.com/questions/371328/why-is-it-important-to-override-gethashcode-when-equals-method-is-overridden
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      1. POInvalidOperationException in release-mode of visual studio since using .Net 4.0
      1. USSimon Mourier
 

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