Tag: Ignored Directives

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Run C# Source Files Directly in .NET 10

The file app is a new feature in .NET 10 that lets you run a C# source file directly without requiring a project file, like dotnet App.cs. While the build system is tightly integrated with the project file, it operates virtually within the file-based app execution.

Project components like SDK, properties, references, and packages are now defined directly within the C# source file. This is done with the help of C# Ignored Directives. This ensures seamless integration with the virtual project file.

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Using C# Ignored Directives: A Guide for Programmers

.NET 10 File-based Apps and C# Ignored Directives
.NET 10 File-based Apps and C# Ignored Directives

C# – Preprocessor Directives are highly useful for writing code that can be compiled conditionally, depending on factors like the target framework, target platform, or build configuration.

For example:

#if NET9_0_OR_GREATER
// The code within this block will execute only on .NET 9 or higher
#endif

#if ANDROID
// The code within this block will execute only on the Android OS
#endif

#if DEBUG
// The code within this block will execute only in Debug mode
#endif

C# – Ignored Directives have a similar syntax but are ignored by the compiler because they are for tooling.

The real purpose of this feature is to execute a C# source file directly from the CLI. It doesn’t need a project file. Now, even the plain console app requires a project file, despite the much-simplified top-level statements feature.

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