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PO"CLR detected an invalid program." when calling Generic Methods
 

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  1. PO"CLR detected an invalid program." when calling Generic Methods
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    <p>I write a large static method that takes a generic as a parameter argument. I call this method, and the framework throws a System.InvalidProgramException. This exception is thrown even before the first line of the method is executed.</p> <p>I can create a static class which takes the generic argument, and then make this a method of the static class, and everything works fine.</p> <p>Is this a .NET defect, or is there some obscure generic rule I'm breaking here?</p> <p>For the sake of completeness, I've included the method which fails, and the method which passes. Note that this uses a number of other classes from my own library (eg GridUtils), and these classes are not explained here. I don't think the actual meaning matters: the question is why the runtime crashes before the method even starts.</p> <p>(I'm programming with Visual Studio 2005, so maybe this has gone away in Visual Studio 2008.)</p> <p><b>This throws an exception before the first line is invoked:</b></p> <pre><code> private delegate void PROG_Delegate&lt;TGridLine&gt;(DataGridView dgv, IEnumerable&lt;TGridLine&gt; gridLines, string[] columns); public static void PopulateReadOnlyGrid&lt;TGridLine&gt;(DataGridView dgv, IEnumerable&lt;TGridLine&gt; gridLines, string[] columns) { if (dgv.InvokeRequired) { dgv.BeginInvoke ( new PROG_Delegate&lt;TGridLine&gt;(PopulateReadOnlyGrid&lt;TGridLine&gt;), new object[] { dgv, gridLines, columns } ); return; } GridUtils.StatePreserver statePreserver = new GridUtils.StatePreserver(dgv); System.Data.DataTable dt = CollectionHelper.ConvertToDataTable&lt;TGridLine&gt;((gridLines)); dgv.DataSource = dt; dgv.DataMember = ""; dgv.AutoSizeColumnsMode = DataGridViewAutoSizeColumnsMode.AllCells; GridUtils.OrderColumns&lt;TGridLine&gt;(dgv, columns); statePreserver.RestoreState(); dgv.AutoSizeColumnsMode = DataGridViewAutoSizeColumnsMode.None; } </code></pre> <p><b>This works fine:</b></p> <pre><code> public static class Populator&lt;TGridLine&gt; { private delegate void PROG_Delegate(DataGridView dgv, IEnumerable&lt;TGridLine&gt; gridLines, string[] columns); public static void PopulateReadOnlyGrid(DataGridView dgv, IEnumerable&lt;TGridLine&gt; gridLines, string[] columns) { if (dgv.InvokeRequired) { dgv.BeginInvoke ( new PROG_Delegate(PopulateReadOnlyGrid), new object[] { dgv, gridLines, columns } ); return; } GridUtils.StatePreserver statePreserver = new GridUtils.StatePreserver(dgv); System.Data.DataTable dt = CollectionHelper.ConvertToDataTable&lt;TGridLine&gt;((gridLines)); dgv.DataSource = dt; dgv.DataMember = ""; dgv.AutoSizeColumnsMode = DataGridViewAutoSizeColumnsMode.AllCells; GridUtils.OrderColumns&lt;TGridLine&gt;(dgv, columns); statePreserver.RestoreState(); dgv.AutoSizeColumnsMode = DataGridViewAutoSizeColumnsMode.None; } } </code></pre>
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    1. USAndrew Stapleton
    1. USAndrew Stapleton
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    1. COIs this for ASP.NET, WinForms, or what? What is the GridUtils namespace?
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      1. USGregUzelac
    2. COThe GridUtils namespace is part of my own library. I'll clarify that it the message, thanks.
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      1. USAndrew Stapleton
    3. COIn direct answer to your question, it happens to be in WinForms.
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      1. USAndrew Stapleton
 

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