icsharpcode/ILSpy

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.NET Decompiler with support for PDB generation, ReadyToRun, Metadata (&more) - cross-platform!

Stars: 26.1k
Forks: 3.7k
Open beginner issues: 0
Indexed issues: 167
Avg merge: 1d 11h
Merged PRs (30d): 80

Dominant language: C#
License: MIT
Last GitHub push: Sep 20, 2026
Latest indexed: Sep 17, 2026
Contributing guide: Contributing guide
Code of conduct: No code of conduct
Beginner labels: help wanted

Beginner friendly Everything

Open All

161 open issues indexed

Matched text is hard to read when find (Ctrl+F) Open

Bug

Difficulty 3/5 1-2 days Newbie friendliness 35/100

icsharpcode/ILSpy#4159 · Opened Sep 20, 2026
WPF project export misses the transitive references the XAML markup compiler needs Open

Difficulty 4/5 3-5 days Newbie friendliness 68/100

icsharpcode/ILSpy#4155 · Opened Sep 20, 2026
foreach is lost when a named argument inlines the loop variable Open

Difficulty 4/5 3-5 days Newbie friendliness 48/100

icsharpcode/ILSpy#4153 · Opened Sep 19, 2026
DeclareVariables: collision check assumes two same-named variables have the same type Open

Difficulty 4/5 3-5 days Newbie friendliness 65/100

icsharpcode/ILSpy#4152 · Opened Sep 19, 2026
App.axaml comment claims the Simple theme has no Dark dictionary; audit dark-mode overrides Open

Difficulty 4/5 3-5 days Newbie friendliness 48/100

icsharpcode/ILSpy#4151 · Opened Sep 19, 2026
Incorrect cursor when hovering over button and check box on 'About' tab Open

Bug

Difficulty 2/5 1-3 hours Newbie friendliness 70/100

icsharpcode/ILSpy#4148 · Opened Sep 19, 2026
ILSpy sometimes lose its taskbar icon Open

Bug

Difficulty 4/5 3-5 days Newbie friendliness 35/100

icsharpcode/ILSpy#4143 · 3 comments · Opened Sep 16, 2026
Conditional in unsafe code prints (IntPtr) casts where nint was used Open

Decompiler Output

Difficulty 3/5 1-2 days Newbie friendliness 68/100

icsharpcode/ILSpy#4137 · Opened Sep 13, 2026
Lifted null comparison decompiles to HasValue/GetValueOrDefault with a '? true : false' Open

Decompiler Output

Difficulty 4/5 3-5 days Newbie friendliness 55/100

icsharpcode/ILSpy#4136 · 1 comment · Opened Sep 13, 2026
Bool-to-int conditional is inlined into every use instead of kept in its local Open

C# Decompiler

Difficulty 4/5 3-5 days Newbie friendliness 52/100

icsharpcode/ILSpy#4135 · Opened Sep 13, 2026
Duplicate sequence point definitions when generating a PDB for real assemblies Open

Bug PDBGen

Difficulty 4/5 3-5 days Newbie friendliness 58/100

icsharpcode/ILSpy#4123 · Opened Sep 8, 2026
Sequence points can land in the middle of an IL instruction Open

Bug PDBGen

Difficulty 3/5 1-2 days Newbie friendliness 74/100

icsharpcode/ILSpy#4122 · Opened Sep 8, 2026
StateMachineHoistedLocalScopes rows are not aligned with the hoisted slots Open

Bug PDBGen

Difficulty 4/5 3-5 days Newbie friendliness 68/100

icsharpcode/ILSpy#4121 · Opened Sep 8, 2026
Generated PDB contains no imports and its ImportScope table has two roots Open

Bug PDBGen

Difficulty 3/5 1-2 days Newbie friendliness 76/100

icsharpcode/ILSpy#4120 · Opened Sep 8, 2026
Pathological decompilation time on large ANTLR3-generated lexer classes (100s+ for a single type) Open

Difficulty 4/5 3-5 days Newbie friendliness 45/100

icsharpcode/ILSpy#4094 · Opened Aug 31, 2026
nugetfuzz: dependency staging can pair a wrong version or framework flavor yet count the reference as resolved Open

Difficulty 4/5 3-5 days Newbie friendliness 48/100

icsharpcode/ILSpy#4093 · Opened Aug 31, 2026
nugetfuzz: stage the forward targets of facade assemblies Open

Difficulty 4/5 3-5 days Newbie friendliness 55/100

icsharpcode/ILSpy#4092 · Opened Aug 31, 2026
Two back-to-back deconstructions in one method are not recognized Open

Bug Decompiler

Difficulty 3/5 1-2 days Newbie friendliness 74/100

icsharpcode/ILSpy#4059 · 1 comment · Opened Aug 26, 2026
Lambda parameter 'params' and default values are dropped below C# 12 Open

Decompiler

Difficulty 3/5 1-2 days Newbie friendliness 57/100

icsharpcode/ILSpy#4058 · Opened Aug 26, 2026
Causes the issue of multiple `explorer.exe` processes failing to exit automatically Open

Bug

Difficulty 3/5 1-2 days Newbie friendliness 52/100

icsharpcode/ILSpy#4055 · 9 comments · Opened Aug 26, 2026
Avalonia UI follow-ups found while fixing #4027/#4028/#4030 (Analyzer pane Ctrl+R and context menu, navigation focus, Dock re-focus) Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

icsharpcode/ILSpy#4042 · 1 comment · Opened Aug 22, 2026
with expression containing an await leaves the raw <Clone>$ call in the output Open

Async Bug Decompiler

Difficulty 4/5 3-5 days Newbie friendliness 55/100

icsharpcode/ILSpy#4019 · 1 comment · Opened Aug 16, 2026
await on a type parameter with an interface constraint drops the operand (LdObjIfRef not supported) Open

Async Bug Decompiler

Difficulty 3/5 1-2 days Newbie friendliness 78/100

icsharpcode/ILSpy#4017 · Opened Aug 16, 2026
Nullable annotations shift after an anonymous type: NullableAttribute flags skip the anonymous type's type arguments Open

Difficulty 3/5 1-2 days Newbie friendliness 74/100

icsharpcode/ILSpy#4016 · Opened Aug 16, 2026
Four await shapes decompile to uncompilable C# Open

Difficulty 4/5 3-5 days Newbie friendliness 48/100

icsharpcode/ILSpy#4015 · 1 comment · Opened Aug 16, 2026
Result of switch expression not being lifted into initializer, causing init-only properties to be set outside of initializer Open

Bug Decompiler

Difficulty 4/5 3-5 days Newbie friendliness 52/100

icsharpcode/ILSpy#4003 · Opened Aug 15, 2026
Improve text rendering clarity in Avalonia UI compared to previous WPF frontend Open

Difficulty 4/5 3-5 days Newbie friendliness 45/100

icsharpcode/ILSpy#3985 · 8 comments · Opened Aug 12, 2026
Explicit delegate constructor not distinguished in C# decompilation. Open

Bug Decompiler

Difficulty 4/5 3-5 days Newbie friendliness 52/100

icsharpcode/ILSpy#3921 · 2 comments · Opened Jul 27, 2026
Analyze support for enum values Open

Enhancement

Difficulty 4/5 3-5 days Newbie friendliness 35/100

icsharpcode/ILSpy#3846 · Opened Jul 1, 2026
Add decompiler accuracy tests as C#/VB.NET/F# snippets Open

Enhancement

Difficulty 5/5 Over a week Newbie friendliness 25/100

icsharpcode/ILSpy#3800 · 2 comments · Opened Jun 22, 2026
Metadata explorer: decoding options and richer viewing for CustomDebugInformation blobs Open

Difficulty 4/5 3-5 days Newbie friendliness 45/100

icsharpcode/ILSpy#3764 · Opened Jun 10, 2026
runtime-async: pretty-test gaps in exception/try-finally rewriting Open

Bug

Difficulty 5/5 Over a week Newbie friendliness 35/100

icsharpcode/ILSpy#3745 · 1 comment · Opened May 20, 2026
Cast lost when ternary with mismatched branch types is hoisted to `object` local Open

Bug Feedback Needed

icsharpcode/ILSpy#3736 · 3 comments · 1 reaction · 1 assignee · Opened May 13, 2026
csproj export emits embedded resources flat instead of restoring folder structure from dotted LogicalName Open

Enhancement

Difficulty 4/5 3-5 days Newbie friendliness 58/100

icsharpcode/ILSpy#3717 · 5 comments · Opened Apr 13, 2026
Pinning GitHub Actions Open

Build Automation github_actions

Difficulty 5/5 Over a week Newbie friendliness 20/100

icsharpcode/ILSpy#3708 · Opened Apr 6, 2026
Phasing out custom domain ilspy.net for GitHub Pages Open

Build Automation

Difficulty 2/5 1-3 hours Newbie friendliness 42/100

icsharpcode/ILSpy#3707 · Opened Apr 6, 2026
Operator '??' cannot be applied to operands of type 'bool' and 'bool' Open

Bug Decompiler

Difficulty 3/5 1-2 days Newbie friendliness 50/100

icsharpcode/ILSpy#3702 · 1 comment · Opened Mar 31, 2026
Failed in stateMachine Open

Bug Decompiler

Difficulty 4/5 3-5 days Newbie friendliness 42/100

icsharpcode/ILSpy#3693 · 1 comment · Opened Mar 24, 2026
MarkupExtensions require Name/Value pairs in the form 'Name=Value'. Each pair must be separated by a comma Open

Bug Decompiler

Difficulty 3/5 1-2 days Newbie friendliness 55/100

icsharpcode/ILSpy#3692 · Opened Mar 23, 2026
C# decompilation uses ternary conditional operator instead of if else, and causes desync on IL with C#. Open

Bug Decompiler

Difficulty 4/5 3-5 days Newbie friendliness 45/100

icsharpcode/ILSpy#3688 · 2 comments · Opened Mar 23, 2026
Unable to search for numerical constants in the array Open

Bug

Difficulty 4/5 3-5 days Newbie friendliness 45/100

icsharpcode/ILSpy#3658 · Opened Jan 30, 2026
`ReduceNestingTransform` increases nesting for long `if` chain Open

Bug Decompiler

Difficulty 4/5 3-5 days Newbie friendliness 52/100

icsharpcode/ILSpy#3654 · Opened Jan 24, 2026
Add support for generating PDBs from NativeAOT libraries Open

Enhancement

Difficulty 5/5 Over a week Newbie friendliness 28/100

icsharpcode/ILSpy#3649 · 5 comments · 1 reaction · Opened Jan 1, 2026
Fields initialized in the constructor should not be ordered by token. Open

Bug Decompiler

icsharpcode/ILSpy#3643 · 6 comments · 1 assignee · Opened Dec 18, 2025
The generated PDB has issues - stackframe switching is not supported. Open

Bug

Difficulty 4/5 3-5 days Newbie friendliness 35/100

icsharpcode/ILSpy#3633 · 3 comments · Opened Dec 2, 2025
ILSpyCmd: Add the ability to output one file per class in IL Open

Enhancement ILSpyCmd

Difficulty 4/5 3-5 days Newbie friendliness 35/100

icsharpcode/ILSpy#3608 · Opened Nov 5, 2025
ILSpyCmd: Add the ability to generate a default decompiler settings file Open

Enhancement ILSpyCmd

Difficulty 3/5 1-2 days Newbie friendliness 48/100

icsharpcode/ILSpy#3607 · Opened Nov 5, 2025
Allow reordering decompiled member types Open

Enhancement

Difficulty 5/5 Over a week Newbie friendliness 35/100

icsharpcode/ILSpy#3603 · Opened Oct 26, 2025
Does not handle collection expression in call to base constructor properly Open

Enhancement

Difficulty 3/5 1-2 days Newbie friendliness 48/100

icsharpcode/ILSpy#3567 · 1 comment · Opened Sep 24, 2025
Parallelize (multithread) ILSpyCmd Project Decompilation Open

Enhancement ILSpyCmd

Difficulty 5/5 Over a week Newbie friendliness 20/100

icsharpcode/ILSpy#3509 · 10 comments · Opened Jul 7, 2025

icsharpcode/ILSpy

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