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PO.NET4: In-Process Side-by-Side Execution Explained
 

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    <p><strong>Overview</strong>: I'm interested in learning more about the .NET4 "In-Process Side-by-Side Execution" of assemblies, and need additional information to help me demystify it.</p> <p><strong>Motivation</strong>: The application in question is built against .NET2, and uses two third-party libraries that also work against .NET2. The application is deployed (via file copy) to client machines in a virtual environment that includes .NET2. <em>Not my architecture, please bear with me.</em></p> <p><strong>Goal</strong>: To see if it's possible to rebuild the application assemblies (or a subset) against .NET4, and ship the application as before, without changing the third-party libraries and including the .NET4 Client Profile (as described <a href="http://www.hanselman.com/smallestdotnet/" rel="noreferrer">here</a>) in the deployment.</p> <p><strong>Steps Taken</strong>: The following articles were read, but didn't quite provide me enough information:</p> <ol> <li><p><a href="http://msdn.microsoft.com/en-us/library/ee518876.aspx" rel="noreferrer">In-Process Side-by-Side Execution</a>: Browsed this article, and Scenario Two is the closest it comes to describing something that resembles my situation, but doesn't really cover it with any depth.</p></li> <li><p><a href="http://msdn.microsoft.com/en-us/library/a99txfy5.aspx" rel="noreferrer">ASP.NET Side-by-Side Execution Overview</a>: This article covers a web application, but I'm dealing with a client WinForms application.</p></li> <li><p><a href="http://blogs.msdn.com/clrteam/archive/2009/06/03/in-process-side-by-side-part1.aspx" rel="noreferrer">CLR Team Blog: In-Process Side-by-Side</a>: This is useful to explain how plug-ins to host processes function under .NET4, but I don't know if this applies to the third-party libraries.</p></li> </ol> <p><strong>Further Steps</strong>: I'm also unclear on how to proceed upgrading a single .NET2 assembly to .NET4, with the executable remaining in .NET2 (i.e. how to configure the solution/project files, if any special code needs to be included, etc.).</p>
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    1. USGeorge Stocker
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    1. CO+1, very nice question.
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    2. COSilly question perhaps, but have you just tried running the application as-is in the .NET 4 CLR? Do you *know* that the third party assemblies won't work (e.g. due to mixed-mode code)? I'd try to get everything running under .NET 4 before going side-by-side.
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      1. USJon Skeet
    3. COIgnore previous comment. From what I understand (and I'm fuzzy on this as well), the virtual environment (ThinApp) ships some kind of .NET2 redistributable, and the third-party library (Crystal Reports) works against that. So, no, haven't gotten a chance yet but currently working on it - I'd like to know what I'm getting into. I think it is a pain to upgrade in-place the ThinApp clients, but *I think* we can distribute .NET Client Profile via file copy without as many hitches.
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