TestAppsTopLevel

Better support for testing apps with top-level statements

.NET 10 now has better support for testing apps that use top-level statements. Previously developers had to manually add public partial class Program to the Program.cs file so that the test project could reference the Program class. public partial class Program was required because the top-level statement feature in C# 9 generated a Program class that was declared as internal.

In .NET 10, a source generator is used to generate the public partial class Program declaration if the programmer didn't declare it explicitly. Additionally, an analyzer was added to detect when public partial class Program is declared explicitly and advise the developer to remove it.

The following PRs contribited to this feature:

• PR 58199
• PR 58482