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

In order to upgrade/migrate asp.net 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  https://dotnet.microsoft.com/download/dotnet-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(); }) Change AddMvc method has been replaced by AddControllers in Startup.cs of each projects.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

System.Security.SecurityException: Request failed. issue on web server [resolved]

While hosting your website on shared hosting server you might get the System.Security.SecurityException: Request failed issue which will give you below stack trace on landing page of the website.

Description: The application attempted to perform an operation not allowed by the security policy. To grant this application the required permission please contact your system administrator or change the application's trust level in the configuration file.

Exception Details: System.Security.SecurityException: Request for the permission of type 'System.Security.Permissions.SecurityPermission, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089' failed.



  • You can add below code to your Application web.config file to resolve it permanently

 
<system.web>
    <customErrors mode="Off"/>
    <trust level="Full" />
</system.web>
 
 
  • This issue might occur in the case when server does not have higher version of .Net framework installed. suppose your application is developed to work with 4.5 run-time framework but the same version is not installed on the server. You can ask your web hosting provider to install the required version on the server so that your website will work as expected.

You can refer below Microsoft support post for detailed information on this issue.

 https://support.microsoft.com/en-us/help/555466

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