Serialization event handlers that don’t have the correct signature will simply not be called, thus bypassing any attempts to augment the automated de/serialization.

This rule raises issue when a method marked with one of the following attributes is Public, Shared, is a Function not a Sub, has type parameters, or does not have a single parameter of type System.Runtime.Serialization.StreamingContext:

• System.Runtime.Serialization.OnSerializingAttribute
• System.Runtime.Serialization.OnSerializedAttribute
• System.Runtime.Serialization.OnDeserializingAttribute
• System.Runtime.Serialization.OnDeserializedAttribute

Noncompliant Code Example

<Serializable>
Public Class Foo
    <OnSerializing>
    Public Sub OnSerializing(ByVal context As StreamingContext) ' Noncompliant should be private
    End Sub

    <OnSerialized>
    Private Function OnSerialized(ByVal context As StreamingContext) As Integer '  Noncompliant should return void
    End Function

    <OnDeserializing>
    Private Sub OnDeserializing() ' Noncompliant should have a single parameter of type StreamingContext
    End Sub

    <OnSerializing>
    Public Sub OnSerializing2(Of T)(ByVal context As StreamingContext) ' Noncompliant should have no type parameters
    End Sub

    <OnDeserialized>
    Private Sub OnDeserialized(ByVal context As StreamingContext, ByVal str As String) ' Noncompliant should have a single parameter of type StreamingContext
    End Sub
End Class

Compliant Solution

<Serializable>
Public Class Foo
    <OnSerializing>
    Private Sub OnSerializing(ByVal context As StreamingContext)
    End Sub

    <OnSerialized>
    Private Sub OnSerialized(ByVal context As StreamingContext)
    End Sub

    <OnDeserializing>
    Private Sub OnDeserializing(ByVal context As StreamingContext)
    End Sub

    <OnDeserialized>
    Private Sub OnDeserialized(ByVal context As StreamingContext)
    End Sub
End Class