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Code Analyzer for VB.NET

There is a newer version: 10.5.0.109200

Why is this an issue?
Marking a method with the Pure
attribute indicates that the method doesn’t make any visible state changes. Therefore, a Pure method should return a result. Otherwise,
it indicates a no-operation call.
Using Pure on a void method is either by mistake or the method is not doing a meaningful task.
How to fix it
Code examples
Noncompliant code example
Class Person
    Private age As Integer

    <Pure> ' Noncompliant: The method makes a state change
    Private Sub ConfigureAge(ByVal age As Integer)
        Me.age = age
    End Sub

    <Pure>
    Private Sub WriteAge() ' Noncompliant
        Console.WriteLine(Me.age)
    End Sub

End Class

Compliant solution
Class Person
    Private age As Integer

    Private Sub ConfigureAge(ByVal age As Integer)
        Me.age = age
    End Sub

    <Pure>
    Private Function Age() As Integer
        Return Me.age
    End Function

    ' or remove Pure attribute from the method

    Private Sub WriteAge()
        Console.WriteLine(Me.age)
    End Sub

End Class

Resources
Documentation

   Microsoft Learn - PureAttribute Class