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Modern C# and .NET Tutorial: Cross-Platform Basics

Controlling the Hosting Environment

Explore how to manage and customize hosting environments in ASP.NET Core Razor Pages. Learn to configure environment variables in launchSettings.json to switch between development and production modes, enabling proper exception handling and server settings for your web application.

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In ASP.NET Core 5 and earlier, the project template set a rule to say that while in development mode, any unhandled exceptions will be shown in the browser window for the developer to see the details of the exception, as shown in the following code:

C#
if (app.Environment.IsDevelopment())
{
  app.UseDeveloperExceptionPage();
}

With ASP.NET Core 6 and later, this code is executed automatically, so it is not included in ...