[Visual Studio] F12 Go to Definition on .NET 9 library types occasionally goes to the wrong files
- Dominant language
- C#
- Stars
- 20.7k
- Forks
- 4.3k
- PR merge metrics
- PR metrics pending
Description
**Version Used**:
VS 17.14, .NET 9.0.3
**Steps to Reproduce**:
1. Create a trivial project targeting .NET 9
2. Add the following code to a class method:
```csharp
Process p = new Process();
p.OutputDataReceived
```
3. F12 `OutputDataReceived`
4. F12 again on the delegate type of `OutputDataReceived`, `DataReceivedEventHandler`
**Expected Behavior**:
F12 on `DataReceivedEventHandler` should go to `DataReceivedEventArgs.cs` [where it is defined in the runtime](https://github.com/dotnet/runtime/blob/f0230dbda533cbd6531e44d24bc0c6e298be56e8/src/libraries/System.Diagnostics.Process/src/System/Diagnostics/DataReceivedEventArgs.cs#L6)
**Actual Behavior**:
F12 on `DataReceivedEventHandler` navigates to `Interop.GetModuleInformation.cs`
Additional notes:
- I have anecdotally hit this with other types.
- Closing the document and F12ing again continuously yields the same incorrect document.
- Verified on 2 separate machines / VS versions / .NET 9 versions
- Interestingly, public docs for `DataReceivedEventHandler` also list the wrong source document, though it is different from the one yielded by Go to Definition (`Interop.ForkAndExecProcess.cs`): https://learn.microsoft.com/en-us/dotnet/api/system.diagnostics.datareceivedeventhandler?view=net-9.0
- Even more curious, the .NET 10 version of the page (`?view=net10.0`) has the correct file.
Contributor guide
Research direction
Reproduce the issue in Visual Studio 17.14 with a .NET 9 project using the listed Process and DataReceivedEventHandler steps. Compare F12's destination with the runtime's DataReceivedEventArgs.cs and the documentation links; done means F12 consistently opens the correct source file.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- csharp
- Domain
- devtools
- Issue type
- Bug
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 35/100