False positive for S4275 Getters and setters should access the expected fields False postive

Rules and Languages Report False-positive / False-negative...
1

Seems something has changed in the processing for S4275 “recently” (between January 18th and this morning).

We have code that is loosely like:

Public Class A
    Private _chargeId as Integer
    Public Overrideable Property ChargeId As Integer
        Get
            Return _chargeId
        End Get
        Set(value As Integer)
            If (value <> _chargeId)
                _chargeId = value ' strictly speaking, we're doing other validation, but a scenario where auto properties aren't a solution
            End If
        End Set
    End Propery
End Class

Public Class B
    Inherits A

    Public Overrides Property ChargeId As Integer
        Get ' Refactor this getter so that it actually refers to the field '_chargeID'.
            Return If(SomeCondition, MyBase.ChargeId, 1234)
        End Get
        Set(value As Integer) ' Refactor this setter so that it actually refers to the field '_chargeID'
            MyBase.ChargeId = value
        End Set
    End Property
End Class

So we’re overriding a virtual method that doesn’t have access to _chargeId, yet the derived class class is told it should reference it.

As an aside, this also doesn’t show up in Visual Studio; but only when doing analysis on a build with Azure DevOps…

3

Hi @RowlandShaw,

thanks a lot for your feedback. I can confirm the false positive, I’ve added an issue and you can follow the progress here: Rule S4275: false positive on Visual Basic when using property overload · Issue #5336 · SonarSource/sonar-dotnet · GitHub

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