Attributes cannot be applied to parameters of lambda expressions

You have applied an attribute to a parameter in a lambda expression definition, which is not supported. The following code causes this error.

Sub LambaAttribute()
    ' Not valid.
    Dim add1 = _
    Function(<System.Runtime.InteropServices.InAttribute()> m As Integer) _
                   m + 1
End Sub

Error ID: BC36634

To correct this error

• Remove the attribute, or consider revising your code by changing the lambda expression to a regular function.

See Also

Concepts

Lambda Expressions

Reference

InAttribute

Other Resources

Attributes in Visual Basic