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Lambda expressions are not valid in the first expression of a 'Select Case' statement

You cannot use a lambda expression for the test expression in a Select Case statement. Lambda expression definitions return functions, and the test expression of a Select Case statement must be an elementary data type.

The following code causes this error:

' Select Case (Function(arg) arg Is Nothing)
    ' List of the cases.
' End Select

Error ID: BC36635

To correct this error

  • Examine your code to determine whether a different conditional construction, such as an If...Then...Else statement, would work for you.

  • You may have intended to call the function, as shown in the following code:

    Dim num? As Integer
    Select Case ((Function(arg? As Integer) arg Is Nothing)(num))
        ' List of the cases
    End Select