After fixing an error in my ASP.NET Core C# code, it is still being marked with the red wavy underline and hovering over it still shows the old error popup

[kenny1983]

Type: Bug

Issue Description

Title pretty much says it all.

Steps to Reproduce

1. Open a C# file (.cs extension).
2. Purposefully introduce some error, e.g. a method call to a method that doesn't exist or a reference to a variable that doesn't exist.
3. Fix said error, e.g. define the missing method or variable.

Expected Behavior

Red, wavy underline disappears and building the project works.

Actual Behavior

Building the project works, but the red, wavy underline still appears (even after a successful build!), either in the same place as before, or at the start of the previously-erroneous line. Hovering over it still pops up the old error dialog with the details in it, even if the line has completely changed to not reference the same method/variable anymore!

The worst part of all of this is that it doesn't always happen and can be somewhat difficult to reproduce. But it usually happens to me roughly 10 - 20 times per day, and the only way I've found to resolve it is to:

1. Delete all bin and obj directories within each project.
2. Rebuild and run the main project again.

Logs

logs.zip

C# log

csharp.log

Environment information

VSCode version: 1.85.2
C# Extension: 2.15.30
Using OmniSharp: false

Dotnet Information

.NET SDK: Version: 8.0.101 Commit: 6eceda187b Workload version: 8.0.100-manifests.69afb982

Runtime Environment:
OS Name: Mac OS X
OS Version: 14.3
OS Platform: Darwin
RID: osx-arm64
Base Path: /usr/local/share/dotnet/sdk/8.0.101/

.NET workloads installed:
Workload version: 8.0.100-manifests.69afb982

Host:
Version: 8.0.1
Architecture: arm64
Commit: bf5e279d92

.NET SDKs installed:
7.0.405 [/usr/local/share/dotnet/sdk]
8.0.101 [/usr/local/share/dotnet/sdk]

.NET runtimes installed:
Microsoft.AspNetCore.App 8.0.1 [/usr/local/share/dotnet/shared/Microsoft.AspNetCore.App]
Microsoft.NETCore.App 8.0.1 [/usr/local/share/dotnet/shared/Microsoft.NETCore.App]

Environment variables:
Not set

global.json file:
Not found

Learn more:
https://aka.ms/dotnet/info

Download .NET:
https://aka.ms/dotnet/download

Visual Studio Code Extensions

|Extension|Author|Version|Folder Name| |---|---|---|---| |csdevkit|ms-dotnettools|1.2.7|ms-dotnettools.csdevkit-1.2.7-darwin-arm64| |csharp|ms-dotnettools|2.15.30|ms-dotnettools.csharp-2.15.30-darwin-arm64| |csharp-format-usings|gaoshan0621|0.0.4|gaoshan0621.csharp-format-usings-0.0.4| |data-workspace-vscode|ms-mssql|0.5.0|ms-mssql.data-workspace-vscode-0.5.0| |mssql|ms-mssql|1.22.1|ms-mssql.mssql-1.22.1| |sql-bindings-vscode|ms-mssql|0.4.0|ms-mssql.sql-bindings-vscode-0.4.0| |sql-database-projects-vscode|ms-mssql|1.4.1|ms-mssql.sql-database-projects-vscode-1.4.1| |user-secrets|adrianwilczynski|2.0.1|adrianwilczynski.user-secrets-2.0.1| |vscode-dotnet-runtime|ms-dotnettools|2.0.1|ms-dotnettools.vscode-dotnet-runtime-2.0.1| |vscode-dotnet-watch|Murugaratham|1.1.8|murugaratham.vscode-dotnet-watch-1.1.8| |vscodeintellicode-csharp|ms-dotnettools|0.1.26|ms-dotnettools.vscodeintellicode-csharp-0.1.26-darwin-arm64| |vstuc|visualstudiotoolsforunity|0.9.4|visualstudiotoolsforunity.vstuc-0.9.4|;

System Info

|Item|Value| |---|---| |CPUs|Apple M3 Pro (11 x 24)| |GPU Status|2d_canvas: enabled
canvas_oop_rasterization: enabled_on
direct_rendering_display_compositor: disabled_off_ok
gpu_compositing: enabled
multiple_raster_threads: enabled_on
opengl: enabled_on
rasterization: enabled
raw_draw: disabled_off_ok
video_decode: enabled
video_encode: enabled
vulkan: disabled_off
webgl: enabled
webgl2: enabled
webgpu: enabled| |Load (avg)|2, 2, 2| |Memory (System)|18.00GB (0.17GB free)| |Process Argv|--crash-reporter-id e0741296-fe57-436d-9555-caf2acc96e94| |Screen Reader|yes| |VM|0%|

A/B Experiments

vsliv368cf:30146710
vspor879:30202332
vspor708:30202333
vspor363:30204092
vscoreces:30445986
vscod805cf:30301675
binariesv615:30325510
vsaa593cf:30376535
py29gd2263:30899288
c4g48928:30535728
azure-dev_surveyone:30548225
2i9eh265:30646982
962ge761:30951796
pythongtdpath:30769146
welcomedialog:30910333
pythonidxpt:30866567
pythonnoceb:30805159
asynctok:30898717
pythontestfixt:30902429
pythonregdiag2:30936856
pyreplss1:30897532
pythonmypyd1:30879173
pythoncet0:30885854
pythontbext0:30879054
accentitlementsc:30887149
dsvsc016:30899300
dsvsc017:30899301
dsvsc018:30899302
dsvsc019bcf:30953938
3ef8e399:30949928

[dibarbet]

@kenny1983 just want to confirm - we've made a number of fixes to the C# extension recently that may have fixed this - could you confirm if you're still seeing this issue in the latest prerelease version (v2.41.26)?