Unveiling .NET Secrets with the World's Smallest C# Program
summary
Creates a two‑character C# file "{}" and compiles it via the Roslyn CSC invoked through dotnet to produce a DLL and PDB, runs to ExitCode 0 after adding a runtimeconfig.json. Uses DotPeek to show the compiler-generated Program.Main, inspects the 12 bytes of IL in a hex editor, watches hostfxr → hostpolicy.dll → coreclr load with WinDbg, observes 42 strings on the heap and JIT output for tiered compilation, and traces file operations with ProcMon; demos all tools successfully. top-level statements
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chapters (13)
- 0:00Introduction
- 1:05Understanding .NET assemblies
- 3:51JIT and tiered compilation
- 8:21Compiling C# with Roslyn
- 13:19Framework vs self-contained apps
- 18:15Exploring DLL with dotPeek
- 23:51Decompiling IL to C#
- 27:02Inspecting DLL bytes
- 33:17Debugging with WinDbg
- 41:22Monitoring with ProcMon
- 47:03Creating projects
- 50:13Building with MSBuild
- 57:10Runtime launch with apphost
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