Visual Studio 2017 Doesn't Run Core Apps with IIS Express

Question

I am having an issue with Visual Studio 2017 RC where when I run an MVC and/or WebAPI app using IIS Express the app never actually runs. Instead I get stuck with a page in the b

Answer 1

I had this same issue and after digging around for a while I discovered that I had dotnet preview v1.0.0-preview2 installed under Programs Files (x86) and a non-preview version in x64. I think VS is launching the x86 (preview) version but expecting to see the full version. To fix this, I did the following.

• from programs and feature uninstall every visible dotnet core. (note: for me this did not remove the x86 preview)
• go to https://www.microsoft.com/net/download/core#/sdk and install BOTH x86 and x64 SDK packages
• open command line and from the root directory check run: dotnet --version (at the time of writing it was 1.0.4)
• fire up .net core project in VS 2017 and run.

When I did all of the above, I was able to start up the site in IIS Express from VS.