ASP.NET Core 2.2 -> 3.0 upgrade. env.IsDevelopment() not found
I upgraded an existing 2.2 project to 3.0. I copied the new code for Program/Startup from a new 3.0 project to my existing 2.2 project. It worked, but the IsDevelopment() below:
public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
{
if (env.IsDevelopment())
{
app.UseDeveloperExceptionPage();
}
}
Results in this error:
'IWebHostEnvironment' does not contain a definition for 'IsDevelopment' and the best extension method overload 'HostingEnvironmentExtensions.IsDevelopment(IHostingEnvironment)' requires a receiver of type 'IHostingEnvironment'
The same line did not caused a newly created 3.0 project. What do I need to modify/add to the project upgraded from 2.2?
The new IHostEnvironment, IsDevelopment, IsProduction etc. extension methods are in the Microsoft.Extensions.Hosting namespace which may need to be added to your app.
Reference:
https://github.com/aspnet/AspNetCore/issues/7749
As Rena says IsDevelopment has been moved to IHostEnvironment Interface in the Microsoft.Extensions.Hosting Namespace
I just had to add the
using Microsoft.Extensions.Hosting;
and then I could use IsDevelopment() as before.
int the extension:
using Microsoft.AspNetCore.Hosting;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.Hosting;
public static class HostingEnvironmentExtensions
{
public static IConfigurationRoot GetAppConfiguration(this IWebHostEnvironment env)
{
return AppConfigurations.Get(env.ContentRootPath, env.EnvironmentName, env.IsDevelopment());
}
}
Follow WeChat
Success story sharing
