What are the 'Magic Names' Generated by the C# Compiler and How Does PostSharp 2.0 Utilize Them?

Decoding Visual Studio Debugger's Hidden Names

Visual Studio's C# compiler employs a system of unique, internal names for types, methods, and variables—names not visible to the developer. These "magic names," revealed through tools like Reflector, serve critical functions in managing optimized local variables, temporary storage locations, and compiler-generated elements.

Limited Documentation & Implementation Details

It's important to note: these naming schemes are not officially documented and are subject to modification without prior notice. However, the following patterns have been observed:

Local Variable Naming Conventions:

• Optimized-away variables: __Deleted$
• Temporary variable slots: CS$X$Y (where X represents the temporary variable type, and Y its index).

Compiler-Generated Element Names:

• Iterator state: P<name>C__state$S
• Iterator current value: P<name>C__current$S
• Anonymous method closures: P<name>C__AnonymousMethodDelegate$S
• Anonymous method classes: P<name>C__DisplayClass$S
• Auto-property backing fields: P<name>C__BackingField$S

The GeneratedNames.cs File

For the most current information on these naming conventions, consult the GeneratedNames.cs file within the C# compiler source code.

PostSharp 2.0 and the Importance of Understanding These Names

A thorough understanding of these internal naming conventions is essential for tools like PostSharp 2.0. By adhering to these conventions, PostSharp ensures a smooth and consistent debugging experience within Visual Studio.

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