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Sep 24, 2025
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Update preprocessor directives documentation #48740

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Update preprocessor directives documentation
IEvangelist Sep 24, 2025
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16 changes: 15 additions & 1 deletion docs/csharp/language-reference/preprocessor-directives.md
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Original file line number Diff line number Diff line change
@@ -1,7 +1,7 @@
---
description: "Learn the different C# preprocessor directives that control conditional compilation, warnings, nullable analysis, and more"
title: "Preprocessor directives"
ms.date: 06/19/2025
ms.date: 09/24/2025
f1_keywords:
- "cs.preprocessor"
- "#nullable"
Expand Down Expand Up @@ -109,6 +109,20 @@ The `#:` directives that are used in file-based apps include:
```xml
<PackageReference Include="System.CommandLine" Version="2.0.0-*">
```

- `#:project`:

Instance of `#:project` are translated into `ProjectReference` elements to include the project with the specified path to the project. For example:

```csharp
#:project ../Path/To.Example.csproj
```

The preceding preprocessor token is translated into:

```xml
<ProjectReference Include="../Path/To.Example.csproj" />
```

Tools can add new tokens following the `#:` convention.

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