Understand implementation details of .NET code by decompiling assemblies. Use when you want to see how a .NET API works internally, inspect NuGet package source, view framework implementation, or understand compiled .NET binaries.

.NET Assembly Decompilation with ILSpy Use this skill to understand how .NET code works internally by decompiling compiled assemblies. Prerequisites .NET SDK installed ILSpy command line tool available via one of the following: dnx ilspycmd (if available in your SDK or runtime) dotnet tool install global ilspycmd Both forms are shown below. Use the one that works in your environment. Note: ILSpyCmd options may vary slightly by version. Always verify supported flags with ilspycmd h . Quick start Common .NET Assembly Locations NuGet packages .NET runtime libraries .NET SDK reference assemblies Reference assemblies do not contain implementations. Project build output Core workflow 1. Identify what you want to understand 2. Locate the assembly 3. List types 4. Decompile the target Commands Basic decompilation Targeted decompilation View IL code Notes on modern .NET builds ReadyToRun images may reduce readability Trimmed or AOT builds may omit code Prefer non trimmed builds Legal note Decompiling assemblies may be subject to license restrictions.

ilspy-decompile