Step by step migration of ASP.NET Core 2.2 to 3.1

In order to upgrade/migrate core version to 3.1 following steps to be perform. Download and install Visual Studio 2019 version 16.4 or higher. Download and install .NET Core 3.1 Upgrade the projects of solution to .NET Core 3.1 , because ASP.NET Core 3.1 requires it. Update existing Nuget packages to a version compatible with ASP.NET Core 3.1 in each project Use IHost interface from a IHostBuilder instead of building and running a IWebHost from a IWebHostBuilder in Program.cs public static IHostBuilder CreateWebHostBuilder(string[] args) => Host.CreateDefaultBuilder(args) .ConfigureWebHostDefaults(webBuilder => { webBuilder.UseKestrel() .UseSerilog() .UseStartup<Startup>(); }) Change AddMvc method has been replaced by AddControllers in Startup.cs of each projects. In Startup.cs, UseMvc method to b

Creation of the virtual directory failed issue whle opening the older version projects in VS2017[solved]

I attempted to load the new VS2015 project in VS2017, but it immediately failed to load.and i am getting below error popup

Creation of the virtual directory http://localhost:32999/
failed with the error: Filename: redirection.config
Error: Cannot read configuration file

there are two solution for this issue

1) Renaming applicationhost.config :

  1.     Close VS2017
  2.     Go into folder %userprofile%\Documents\IISExpress\config
  3.     Rename applicationhost.config
  4.     Restart VS and load the solution/project
  5.     VS should have recreated applicationhost.config, and project should load

2) Copy config files to IISExpress directory

copy all files from

    C:\Program Files\IIS Express\config\templates\PersonalWebServer



any of above solution will resolve your problem..


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