dotnet add package ILReader.Core --version
NuGet\Install-Package ILReader.Core -Version
This command is intended to be used within the Package Manager Console in Visual Studio, as it uses the NuGet module's version of Install-Package.
<PackageReference Include="ILReader.Core" Version="" />
For projects that support PackageReference, copy this XML node into the project file to reference the package.
paket add ILReader.Core --version
#r "nuget: ILReader.Core,"
#r directive can be used in F# Interactive and Polyglot Notebooks. Copy this into the interactive tool or source code of the script to reference the package.
// Install ILReader.Core as a Cake Addin
#addin nuget:?package=ILReader.Core&version=

// Install ILReader.Core as a Cake Tool
#tool nuget:?package=ILReader.Core&version=

CIL-Reader for Methods(e.g. dynamic) and Delegates

Common Intermediate Language reader, analyzer and visualizer tool.
Allows you to access CIL-instructions of .Net method's bodies.

Core Library (ILReader.Core)

Provides a way to read and interprete CIL-bytes of methods and delegates bodies.


var method = typeof(...).GetMethod(...);
// or
var method = delegate.Method;
// or
var method = (DynamicMethod)(/* create or get method */);

Get Reader:

IILReader GetReader(MethodBase method) {
    IILReaderConfiguration cfg = Configuration.Resolve(method);
    return reader = cfg.GetReader(method);

Iterate instructions one-by-one:

foreach(IInstruction instruction in reader) {
    var opCode = instruction.OpCode
    object operand = instruction.Operand;
    int ILOffset = instruction.Offset;
    // ...

Visualizer Library (ILReader.Visualizer)

Debugger Visualizer for Visual Studio. Provides a way to view CIL-bytes of methods and delegates bodies.


Func<...> someFunc = ...; // Just use it while debugging

Analyzer Library (ILReader.Analyzer)

Provides a way to detect typical patterns in CIL-bytes.


class Bar {
    public void Stub() {
        throw new NotImplementedException("Stub");

Check whether or not the method's body match pattern:

var method = typeof(Bar).GetMethod("Stub");
var reader = GetReader(method);
// use default pattern or create you own
var pattern = Analyzer.NotImplemented.Instance;
if (pattern.Match(reader)) {
    // do something

Real usage

MSIL-level boxing detector tool for .Net


To install ILReader.Core, run the following command in the Package Manager Console:

Install-Package ILReader.Core


The ILReader.Core library is licensed under the MIT license.

Product Compatible and additional computed target framework versions.
.NET net6.0 is compatible.  net6.0-android was computed.  net6.0-ios was computed.  net6.0-maccatalyst was computed.  net6.0-macos was computed.  net6.0-tvos was computed.  net6.0-windows was computed.  net7.0 was computed.  net7.0-android was computed.  net7.0-ios was computed.  net7.0-maccatalyst was computed.  net7.0-macos was computed.  net7.0-tvos was computed.  net7.0-windows was computed.  net8.0 was computed.  net8.0-android was computed.  net8.0-browser was computed.  net8.0-ios was computed.  net8.0-maccatalyst was computed.  net8.0-macos was computed.  net8.0-tvos was computed.  net8.0-windows was computed. 
.NET Framework net472 is compatible.  net48 was computed.  net481 was computed. 
Compatible target framework(s)
Included target framework(s) (in package)
Learn more about Target Frameworks and .NET Standard.

NuGet packages (1)

Showing the top 1 NuGet packages that depend on ILReader.Core:

Package Downloads

Library for creating simple static analysis(SA) diagnostics and analyzing .Net assemblies at the IL-code level.

GitHub repositories (1)

Showing the top 1 popular GitHub repositories that depend on ILReader.Core:

Repository Stars
Robust multiplayer game engine, used by Space Station 14
Version Downloads Last updated 437,952 1/8/2023

- Performance optimization + concurrency support + small fixes