If I understand correctly you have a C# or VB project which is embedding IronPython (vs. say trying to build IronPython it's self from source for .NET 4). If that's correct have you downloaded the .NET 4 version of IronPython 2.6 which is available here http://ironpython.codeplex.com/releases/view/36280 ?
If you have a pre-.NET 4.0 project did VS ask you to upgrade the project files? Maybe you just need to open xxxxx.csproj in VS and let it upgrade that too? From: users-boun...@lists.ironpython.com [mailto:users-boun...@lists.ironpython.com] On Behalf Of Ken MacDonald Sent: Thursday, September 16, 2010 8:01 AM To: Discussion of IronPython Subject: [IronPython] how to "target" .NET 4.0? MSB3645:. NET Framework v3.5 Service Pack 1 was not found. In order to target "(0)",. NET Framework v3.5 Service Pack 1 or later must be installed. I'm trying to move an ipy/wpf application that I inherited to IPY 2.6 and .NET 4.0 on Windows 2008 Server. I got the above error message, referencing a "xxxxx.csproj" file deep in my project directory, so I installed Visual studio and opened it up, but the project file shows the target is .NET Framework 4. This is a clean install of 2.6 and 4.0 on a brand new system, so not sure what I have to do to convince this thing that I'm trying to run as 4.0 and not 3.5. I've worked on the IPY source for the project, but didn't have anything do do with the initial setup, so I'm pretty well baffled. Anyone successfully move a project from and earlier version of .NET to 4.0? Ken
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