Rename .cs file -> The namespace 'Namespace' already contains a definition for 'ClassName' [netcoreapp1.0]

[jlost]

Environment data

dotnet --info output:

.NET Command Line Tools (1.0.0-preview2-003121)

Product Information:
 Version:            1.0.0-preview2-003121
 Commit SHA-1 hash:  1e9d529bc5

Runtime Environment:
 OS Name:     Windows
 OS Version:  10.0.14393
 OS Platform: Windows
 RID:         win10-x64

VS Code version: 1.5.3
C# Extension version: 1.4.1

Steps to reproduce

1. Open dotnet core solution from base solution directory
2. Open any .cs file
3. Rename it
4. Make a minor, valid change to the code so OmniSharp reevaluates it
5. Observe as errors appear: Class name has The namespace 'Namespace' already contains a definition for 'ClassName' [netcoreapp1.0]. Methods have Type 'ClassName' already defines a member called 'MethodName' with the same parameter types [netcoreapp1.0]

[matthamil]

I had this same issue, see #803.

[gulshan]

Experienced same issue.

[THuffam]

Same error occuring for me - rename a .cs file and get the errors mentioned above. Need to restart VS Code to fix.

[DustinCampbell]

This is fixed with the latest beta v1.13.0-beta4. You can install it by following the instructions here.

[ehajri]

This is fixed only in beta? because I am still facing this issue with v1.13.

[DustinCampbell]

Yes, this was fixed in 1.13. @rchande?

[rchande]

@ehajri It should be fixed. Can you provide more information about what's happening to you?

[ehajri]

@DustinCampbell, @rchande I removed the extension and it appears to be 1.13.1 now.
It seems to be fixed (or maybe a reboot did it, not sure). I'll update this if it reoccurs.

[DustinCampbell]

Thanks for the update @ehajri. I've seen some evidence of strange install issues with VS Code 1.18 that seem to "correct" themselves later. Hopefully, that's all this was.

[dubeg]

I'm having this problem using C# extension 1.13.1 (and VSCode 1.19 Insiders) in a particular scenario.

Steps

1. Rename a class using F2 within the buffer.
2. Rename the filename using F2 in the explorer to match the new class name.

I get a squiggly line on the classname for the same "Namespace already contains a definition" error.

WebmOfRepro.zip

EDIT:
It seems to happen only with multiple root folders? I'm not sure.
Here's the minimum code/files I could strip down to and still be able to reproduce it:
renameBug.zip

[johncrisostomo]

Odd, but I experienced this today, too. Restructuring my project directory triggered this. Restarting VSCode fixed it.

[rchande]

@johncrisostomo What extension version are you on?

[colotiline]

Had the same issue today.

VS Code info

Version: 1.27.2 (user setup)
Commit: f46c4c469d6e6d8c46f268d1553c5dc4b475840f
Date: 2018-09-12T16:17:45.060Z
Electron: 2.0.7
Chrome: 61.0.3163.100
Node.js: 8.9.3
V8: 6.1.534.41
Architecture: x64
OS: Windows 10 Pro

OmniSharp

Version: 1.16.1.

Workaround
OmniSharp restart helped.

Case

• Create a class description.
• Use it in another class.
• Use F2 to refactor the class name (from the another class).
• Go to Explorer in VS Code and rename file with the class description.
• Get the error.

[PhotoAtomic]

i was experiencing this as well, every time i rename a file the type inside it appears to be duplicated

code --version
1.29.1
bc24f98b5f70467bc689abf41cc5550ca637088e
x64

code --list-extensions --show-versions
Angular.ng-template@0.1.11
AureliaEffect.aurelia@1.0.3
behzad88.Aurelia@1.2.2
christian-kohler.path-intellisense@1.4.2
coolbear.systemd-unit-file@1.0.2
EditorConfig.EditorConfig@0.12.5
eg2.tslint@1.0.40
HookyQR.beautify@1.4.7
jchannon.csharpextensions@1.3.0
jock.svg@0.1.4
ms-mssql.mssql@1.4.0
ms-python.python@2018.11.0
ms-vscode.csharp@1.17.1
ms-vscode.PowerShell@1.10.0
msjsdiag.debugger-for-chrome@4.11.1
msjsdiag.debugger-for-edge@1.0.6
PeterJausovec.vscode-docker@0.4.0

i also changed
"omnisharp.path": null
to
"omnisharp.path": "latest"

i think i was using a default(older) omnisharp version but this didn't solved the issue
now i've
OmniSharp Version = 1.32.9-beta.10

the issue appears ONLY if i work with vscode workspace,

steps to reproduce:

---

mkdir test
cd test
dotnet new classlib -f netstandard2.0 -n omnitest
code .
from inside vs code
File -> Save Workspace As…
chose where the test folder is
name the workspace "test.code-workspace"

wait for omnisharp to complete to load and process the project
you should see a file "class1.cs" created by the classlib template by dotnet new

select it and rename it "class2.cs"

you'll see that a red squiggle appear below
public class Class1
problems tab will report
{
"resource": "/c:/temp/omnisharp/omnitest/Class2.cs",
"owner": "csharp",
"severity": 8,
"message": "The namespace 'omnitest' already contains a definition for 'Class1' [omnitest]",
"startLineNumber": 5,
"startColumn": 18,
"endLineNumber": 5,
"endColumn": 24
}

as i said if i open the folder with "code . " instead of using the workspace file the issue didn't appear.
it is strictly related to the use of workspaces.

I hope this help to understand where the issue is, it is really annoying to keep restarting omnisharp

[dubeg]

@PhotoAtomic Oh, you might be on to something. If I open a single folder, I can rename without issue, but if I then add another folder (if that has any importance, via the side pane Explorer -> Right-Click -> Add Folder to workspace), then error will appear on renames.

[NickChlam]

@THuffam

Restarting Omnisharp also works. CTRL + SHIFT + P, then 'Restart Omnisharp'. Faster than restarting VSCode at least

This worked for me.

[robwillup]

@THuffam

Restarting Omnisharp also works. CTRL + SHIFT + P, then 'Restart Omnisharp'. Faster than restarting VSCode at least 😄

This works, thanks for sharing!

[Abdulkareem83]

The same issue here, And restart vs code or Omnisharp doesn't work for me. So odd

[toptulla]

The same issue here, And restart vs code or Omnisharp doesn't work for me. So odd

Running a VS Code with admin rights "helps".

[hk1ll3r]

3 years later, still have to restart omnisharp after a file rename. Supporting these "advanced" use cases must be real hard.

[poctob]

Original bug is still present. Also reproducible on copying and pasting a file containing a class. And as of today, reproducible on adding a new file and adding a new class.

Looks like latest stable:
extensions\ms-dotnettools.csharp-1.23.0.omnisharp\1.36.1\OmniSharp.exe
Windows 10
VS Code 1.48.0
.net core 3.1 project

[ghost]

The same issue.
code --version
1.65.0
b5205cc8eb4fbaa726835538cd82372cc0222d43
x64

code --list-extensions --show-versions
donjayamanne.githistory@0.6.19
icsharpcode.ilspy-vscode@0.13.1
idleberg.openvpn@0.2.3
MS-CEINTL.vscode-language-pack-ru@1.65.1
ms-dotnettools.csharp@1.24.1
ms-dotnettools.vscode-dotnet-runtime@1.5.0
ms-python.python@2022.2.1924087327
ms-python.vscode-pylance@2022.3.0
ms-toolsai.jupyter@2022.2.1020642448
ms-toolsai.jupyter-keymap@1.0.0
ms-toolsai.jupyter-renderers@1.0.6
PrzemyslawOnak.pimp-my-avalonia@0.0.1

lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 21.04
Release: 21.04
Codename: hirsute

[blogcraft]

Same issue... getting tired of omnisharp, many years and no solution. Considering transition my development team to Visual Studio.

Project using .NET 6 and .NET 7
omnisharp v1.25.2

[TheBuzzSaw]

Still no solution for this? It happens to this very day.

/.vscode/extensions/ms-dotnettools.csharp-1.25.8-linux-x64/.omnisharp/1.39.6-net6.0/OmniSharp.dll

[ghost]

I downgraded C# add-on to v1.24.1, and it is a workaround.