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POCross-Process Drag and Drop of custom object type in WinForms C#
 

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    <p><a href="https://stackoverflow.com/questions/1213074/winforms-interop-drag-drop-from-winforms-wpf">This question</a> is close to what I'm interested in, but not quite.</p> <p>I have a .NET WinForms application written in C#. I have a <code>ListView</code> control which displays an array of C# objects. I've hooked it up so that you can drag/drop these listview items to a different form in the same application, and it properly passes the array of objects (type <code>Session</code>) to the drop handler for that other form.</p> <p>However, I now want to support cross-process drag/drop where I run multiple instances of my application. This <em>appears</em> that it's going to work (e.g. <code>GetDataPresent</code> succeeds), but ultimately throws an exception when I actually try to retrieve the data-- cannot cast <code>object[]</code> to <code>Session[]</code>.</p> <pre><code>if (e.Data.GetDataPresent("Fiddler.Session[]")) { Session[] oDroppedSessions; try { oDroppedSessions = (Session[])e.Data.GetData("Fiddler.Session[]"); } catch (Exception eX) { // reaches here } } </code></pre> <p><em>Anyone know if I <strong>must</strong> implement <code>ISerializable</code> for my objects in order to make this work? Ordinarily, I'd simply try it, but implementing <code>ISerializable</code> for this class would be quite non-trivial, and I'm worried that there may be weird side-effects of doing so.</em></p> <hr> <p><strong>UPDATE</strong>: Implementing <code>ISerializable</code> doesn't help-- the method is never called. Similarly, adding the <code>Serializable</code> attribute to the class has no impact at all. Any other ideas?</p>
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    1. USMicha Wiedenmann
    1. USEricLaw
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    1. COAdd a line 'Console.WriteLine(string.Format("Exception caught. Details are {0}", eX.ToString()));' in the catch block. What would be the message?
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    2. CO"cannot cast object[] to Session[]"
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