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Following the instructions on the ASP.Net Core 2.0 announcement blog post I was quickly able to get a website updated to ASP.Net Core 2.0 and run it locally.
The website is hosted on Azure in the App Service model and unfortunately after publishing my project I encountered IIS 502.5 errors. Luckily this was in a deployment slot so my public website was unaffected.
After a bit of head scratching I found two extra steps were required to upgrade an existing web site.
Firstly In your .csproj file you should have an ItemGroup like the one below:
<ItemGroup>
<DotNetCliToolReference Include="Microsoft.VisualStudio.Web.CodeGeneration.Tools" Version="1.0.1" />
</ItemGroup>
You need to change the version to 2.0.0.
Secondly you need to clear out all the old files from your Azure hosted instance. The easiest way to do this is to open Kudu (Advanced Tools in the portal), navigate to the site/wwwroot folder and delete them.
After that if you publish your website again it should work fine.
Hope that saves someone a few hours of head-scratching.
