问题
The reason why I want to upgrade from MVC4 to MVC5 is because MVC5 has Entity Framework Identity already there. I don't want to spend time trying to add Identity to my MVC4 project because it'll take too much time.
Is there like an update button which does it automatically or do I need to create a MVC5 template and copy codes over?
回答1:
I upgraded form MVC4 to MVC5 by following the steps at this link
How to Upgrade an ASP.NET MVC 4 and Web API Project to ASP.NET MVC 5 and Web API 2
that walk you through steps to upgrade from MVC4 to MVC5
Here is a quick summary of the upgrade steps.
Backup your project, as it upgrade will involve changes to package configuration and web.config files.
upgrade from Web API to Web API 2 by making some changes in
global.asaxMake sure all the packages that your projects use are compatible with MVC 5 and Web API 2. They provide a table of package versions from Microsoft packages
Open project in Visual Studio.
Using Package Manager Console (PMC), remove certain ASP.Net NuGet packages if installed.
Upgrade all the ASP.Net NuGet packages using the PMC
They show how to: Update the Application web.config File and Update the web.config files under the Views folder
Check out the link and see if that helps.
回答2:
I upgraded from MVC4 to MVC5 by copying some files from the existing MVC4 project and some files from a new MVC5 web application project into a new empty project.
The issue for me was migrating from SimpleMembership authentication to Identity. I documented the steps I took in this answer: How to migrate from SimpleMembership to ASP.NET.Identity
If you aren't using SimpleMembership already, I would copy files straight from the MVC4 to the MVC5 Web Application.
来源：https://stackoverflow.com/questions/36172440/is-it-possible-to-upgrade-an-existing-mvc4-web-application-to-mvc5