CODEWITHSUNDEEP
asp.net-core.net-coreasp.net-core-3.0
kofifus
kofifus

Reputation: 19295

'IHostingEnvironment' is obsolete

I updated my ASP.NET Core project to .NET Core v3.0.0-preview3, and I now get:

Startup.cs(75,50,75,69): warning CS0618: 'IHostingEnvironment' is obsolete: 'This type is obsolete and will be removed in a future version. The recommended alternative is Microsoft.AspNetCore.Hosting.IWebHostEnvironment.'

The code is:

public void Configure(IApplicationBuilder app, IHostingEnvironment env) {
  if (env.IsDevelopment()) {
    …
  }
}

What is the correct way to do this now? Are there any documentation or examples to demonstrate that?

Upvotes: 100

Views: 86323

Answers (5)

Simply Ged
Simply Ged

Reputation: 8662

It seems IHostingEnvironment has been replaced by IHostEnvironment (and a few others). You should be able to change the interface type in your code and everything will work as it used to :-)

You can find more information about the changes at this link on GitHub https://github.com/aspnet/AspNetCore/issues/7749

There is also an additional interface IWebHostEnvironment that can be used in ASP.NET Core applications. This is available in the Microsoft.AspNetCore.Hosting namespace.

Upvotes: 122

Fayyaz Naqvi
Fayyaz Naqvi

Reputation: 763

The type IHostingEnvironment is obsolete for ASP.NET Core 3.0+. And according to Microsoft:

The recommended alternative is Microsoft.AspNetCore.Hosting.IWebHostEnvironment.

https://learn.microsoft.com/en-us/dotnet/api/microsoft.aspnetcore.hosting.ihostingenvironment?view=aspnetcore-7.0

IHostingEnvironment is obsolete for following versions as of today: enter image description here

Upvotes: 2

Adilson Pereira Silva
Adilson Pereira Silva

Reputation: 59

From ASP.NET Core 5, use:

using Microsoft.AspNetCore.Hosting;
using Microsoft.Extensions.Hosting;
...
public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
    if (Environments.Development.Equals(env.EnvironmentName))
    {
        ...

Upvotes: 5

leocrimson
leocrimson

Reputation: 742

For env.IsDevelopment(), I used env.EnvironmentName.Equals("Development")

Upvotes: 3

Chris Pratt
Chris Pratt

Reputation: 239300

When Microsoft.Extensions.Hosting was introduced in 2.1 some types like IHostingEnvironment and IApplicationLifetime were copied from Microsoft.AspNetCore.Hosting. Some 3.0 changes cause apps to include both the Microsoft.Extensions.Hosting and Microsoft.AspNetCore.Hosting namespaces. Any use of those duplicate types causes an "ambiguous reference" compiler error when both namespaces are referenced.

This error has been addressed in 3.0.0-preview3 by marking the following types obsolete and replacing them with new types. There have not been any behavioral changes made for the new types, only naming.

Obsolete types (warning):

Microsoft.Extensions.Hosting.IHostingEnvironment
Microsoft.AspNetCore.Hosting.IHostingEnvironment
Microsoft.Extensions.Hosting.IApplicationLifetime
Microsoft.AspNetCore.Hosting.IApplicationLifetime
Microsoft.Extensions.Hosting.EnvironmentName
Microsoft.AspNetCore.Hosting.EnvironmentName

New types:

Microsoft.Extensions.Hosting.IHostEnvironment
Microsoft.AspNetCore.Hosting.IWebHostEnvironment : IHostEnvironment
Microsoft.Extensions.Hosting.IHostApplicationLifetime
Microsoft.Extensions.Hosting.Environments

Note the new IHostEnvironment IsDevelopment, IsProduction, etc. extension methods are in the Microsoft.Extensions.Hosting namespace which may need to be added to your app.

For 3.0 both the old and new types will be available from HostBulder's and WebHostBuilder's dependency injection containers. The old types will be removed in 4.0.

Source: https://github.com/aspnet/AspNetCore/issues/7749

Long and short, you're looking for IWebHostEnvironment now. You'll likely need to add using for Microsoft.Extensions.Hosting as well.

Upvotes: 85

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