Convert C# top-level statements to the old-style Program class

The top-level statements are a feature introduced in C# 10. The idea is to reduce the boilerplate code needed to define aplication’s entry point. So instead of the traditional:

using System; namespace Application { class Program { static void Main(string[] args) { Console.WriteLine("Hello World!"); } } }
Code language: C# (cs)

We can write the code directly in the main project’s file, which reduces the code to just one line:

Console.WriteLine("Hello, World!");
Code language: JavaScript (javascript)

.NET 6 templates use this new, concise form by default. But I find it rather confusing to have one file in a project follow different syntax rules or conventions. I see the traditional way as simpler, even if a bit more verbose. So how to fastest convert between one form and another?

Hopefully, if you have ReSharper 2022.2, there is an automatic conversion available, albeit a bit hard to discover. It seems to appear when you place your cursor on… an empty like in the Program.cs file with top-level statements, and click the hammer icon, or press Alt+Enter:

Converting C# program using top-level statements to a class with main method.
An action available to convert C# top-level statements to a class

When selected, the conversion works just fine:

Entry point to C# program, automatically generated by conversion from top-level statements.
A class automatically created based upon clicking on the “To explicit ‘Program’ class” action

The reverse action, transforming Program.cs class into the compact form, is similarly available. This one is a bit easier to find: it’s in the line where the Program class starts.

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