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I work on the migration of an .NET CORE API. Firstly, I have this error message :

The name 'WebHost' does not exist in the current context

So Visual Studio suggest me to have this namespace :

using Microsoft.AspNetCore.Hosting.Internal;

I put it in my file, after that I have this error message :

'WebHost' does not contain a definition for 'CreateDefaultBuilder'

I don't know why it's doing that. Can I have some help ?

public static IWebHost BuildWebHost(string[] args) => WebHost.CreateDefaultBuilder(args);
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  • use Microsoft.AspNetCore.Hosting instead of "Microsoft.AspNetCore.Hosting.Internal;" Commented Aug 29, 2018 at 8:16
  • On which version of .NET Core runtime are you? And which template version Commented Aug 29, 2018 at 8:16
  • @Tseng I use this version : 2.1.302 Commented Aug 29, 2018 at 8:51

1 Answer 1

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You need a reference to Microsoft.AspNetCore and include the namespace using Microsoft.AspNetCore;. If you use a template, they usually include a meta-package. Depending on the version (2.0 or 2.1) and your IDE, it either will be Microsoft.AspNetCore.All or Microsoft.AspNetCore.App. There you will have all necessary packages included. Is convenient but you might want to add what you need manually.

The suggestion to Microsoft.AspNetCore.Hosting.Internal is not what you are looking for. What you are looking for you find here.

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