Snippet from Startup.cs to demonstrate how IWebHostEnvironment can be used to identify the environment

Startup.cs

// IWebHostEnvironment extends IHostEnvironment
public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
{
    if (env.IsDevelopment())
    {
        app.UseDeveloperExceptionPage();
    }
    else
    {
        app.UseExceptionHandler("/Home/Error");
        // The default HSTS value is 30 days. 
        // You may want to change this for production scenarios, 
        // see https://aka.ms/aspnetcore-hsts.
        app.UseHsts();
    }
}