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POCan I have an .NET 4.0 instance of the CLR and a .NET 3.5 instance of the CLR in the same Windows process?
 

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  1. POCan I have an .NET 4.0 instance of the CLR and a .NET 3.5 instance of the CLR in the same Windows process?
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    <p>I have an multiple assembly C# Excel addin which passes embedded interop types across assembly boundaries. When I run this in an Excel process configured to use .NET 3.5, everything is OK. When I run this in an Excel process configured to use .NET 4.0, only controls with application logic defined in the addin assembly itself load. I think I understand why, since the handling of embedded interop types changed significantly in .NET 4.0, so that they must not cross assembly boundaries. What confuses me is that I thought in .NET 4.0 multiple instances of the CLR could be hosted in a single Windows process. If my addin targets .NET 3.5, why can't it just run in a .NET 3.5 CLR instance owned by Excel? Why is Excel trying to run my addin in .NET 4.0? It's not really an option to rewrite the addin, but it needs to install for a client who also use .NET 4.0 addins, so it's not OK to play with registry keys or the Excel.exe.config files... Any help will be REALLY appreciated!</p>
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      1. POCan I have an .NET 4.0 instance of the CLR and a .NET 3.5 instance of the CLR in the same Windows process?
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    1. COwhat is VSTO version you are using?
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      1. POCan I have an .NET 4.0 instance of the CLR and a .NET 3.5 instance of the CLR in the same Windows process?
      1. USBrijesh Mishra
    2. COI'm using VSTO 4.0, which supports .NET 4.0 and .NET 3.5. I don't know if it supports both concurrently though.
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      1. POCan I have an .NET 4.0 instance of the CLR and a .NET 3.5 instance of the CLR in the same Windows process?
      1. USrichardstartin
 

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