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C# language support status
#829 · dgrunwald opened on Aug 27, 2017
3
Up For Grabs / Help Wanted
#1733 · christophwille opened on Oct 1, 2019

In disassembly, scrollbar window should be greater than scrollbar unit
icsharpcode/ILSpy#4219 · opened on Oct 6, 2026
IndexOutOfRange exception
icsharpcode/ILSpy#4203 · opened on Oct 3, 2026
2
Shift+MouseWheel (horizontal scrolling) moves in pixel increments
icsharpcode/ILSpy#4173 · opened on Sep 24, 2026
3
WPF project export misses the transitive references the XAML markup compiler needs
icsharpcode/ILSpy#4155 · opened on Sep 20, 2026
App.axaml comment claims the Simple theme has no Dark dictionary; audit dark-mode overrides
icsharpcode/ILSpy#4151 · opened on Sep 19, 2026
Lifted null comparison decompiles to HasValue/GetValueOrDefault with a '? true : false'
icsharpcode/ILSpy#4136 · opened on Sep 13, 2026
1
Bool-to-int conditional is inlined into every use instead of kept in its local
icsharpcode/ILSpy#4135 · opened on Sep 13, 2026
Duplicate sequence point definitions when generating a PDB for real assemblies
icsharpcode/ILSpy#4123 · opened on Sep 8, 2026
Sequence points can land in the middle of an IL instruction
icsharpcode/ILSpy#4122 · opened on Sep 8, 2026
StateMachineHoistedLocalScopes rows are not aligned with the hoisted slots
icsharpcode/ILSpy#4121 · opened on Sep 8, 2026
Generated PDB contains no imports and its ImportScope table has two roots
icsharpcode/ILSpy#4120 · opened on Sep 8, 2026
Pathological decompilation time on large ANTLR3-generated lexer classes (100s+ for a single type)
icsharpcode/ILSpy#4094 · opened on Aug 31, 2026
nugetfuzz: dependency staging can pair a wrong version or framework flavor yet count the reference as resolved
icsharpcode/ILSpy#4093 · opened on Aug 31, 2026
nugetfuzz: stage the forward targets of facade assemblies
icsharpcode/ILSpy#4092 · opened on Aug 31, 2026
Two back-to-back deconstructions in one method are not recognized
icsharpcode/ILSpy#4059 · opened on Aug 26, 2026
1
Lambda parameter 'params' and default values are dropped below C# 12
icsharpcode/ILSpy#4058 · opened on Aug 26, 2026
Causes the issue of multiple explorer.exe processes failing to exit automatically
icsharpcode/ILSpy#4055 · opened on Aug 26, 2026
9
with expression containing an await leaves the raw <Clone>$ call in the output
icsharpcode/ILSpy#4019 · opened on Aug 16, 2026
2
await on a type parameter with an interface constraint drops the operand (LdObjIfRef not supported)
icsharpcode/ILSpy#4017 · opened on Aug 16, 2026
Nullable annotations shift after an anonymous type: NullableAttribute flags skip the anonymous type's type arguments
icsharpcode/ILSpy#4016 · opened on Aug 16, 2026
Four await shapes decompile to uncompilable C#
icsharpcode/ILSpy#4015 · opened on Aug 16, 2026
1
Result of switch expression not being lifted into initializer, causing init-only properties to be set outside of initializer
icsharpcode/ILSpy#4003 · opened on Aug 15, 2026
Improve text rendering clarity in Avalonia UI compared to previous WPF frontend
icsharpcode/ILSpy#3985 · opened on Aug 12, 2026
8
Explicit delegate constructor not distinguished in C# decompilation.
icsharpcode/ILSpy#3921 · opened on Jul 27, 2026 · ILSpy Dev Meeting 2026
2
Analyze support for enum values
icsharpcode/ILSpy#3846 · opened on Jul 1, 2026

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Issues

Issues

In disassembly, scrollbar window should be greater than scrollbar unit

IndexOutOfRange exception

Shift+MouseWheel (horizontal scrolling) moves in pixel increments

WPF project export misses the transitive references the XAML markup compiler needs

App.axaml comment claims the Simple theme has no Dark dictionary; audit dark-mode overrides

Lifted null comparison decompiles to HasValue/GetValueOrDefault with a '? true : false'

Bool-to-int conditional is inlined into every use instead of kept in its local

Duplicate sequence point definitions when generating a PDB for real assemblies

Sequence points can land in the middle of an IL instruction

StateMachineHoistedLocalScopes rows are not aligned with the hoisted slots

Generated PDB contains no imports and its ImportScope table has two roots

Pathological decompilation time on large ANTLR3-generated lexer classes (100s+ for a single type)

nugetfuzz: dependency staging can pair a wrong version or framework flavor yet count the reference as resolved

nugetfuzz: stage the forward targets of facade assemblies

Two back-to-back deconstructions in one method are not recognized

Lambda parameter 'params' and default values are dropped below C# 12

Causes the issue of multiple `explorer.exe` processes failing to exit automatically

with expression containing an await leaves the raw <Clone>$ call in the output

await on a type parameter with an interface constraint drops the operand (LdObjIfRef not supported)

Nullable annotations shift after an anonymous type: NullableAttribute flags skip the anonymous type's type arguments

Four await shapes decompile to uncompilable C#

Result of switch expression not being lifted into initializer, causing init-only properties to be set outside of initializer

Improve text rendering clarity in Avalonia UI compared to previous WPF frontend

Explicit delegate constructor not distinguished in C# decompilation.

Analyze support for enum values