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9.4

Option Strict on causing Event code to fail

Asked by p_love in Microsoft Visual Basic.Net, .NET Framework 2.x

Tags: Visual Basic.net, 2.0, Option Strict On disallows implicit conversion from System.EventArgs to System.ComponentModel.CancelEventArgs

Hi,

I had some code which was working fine, but now I have turned Option Strict On, I am getting a build error.

Option Strict On disallows implicit conversion from System.EventArgs to System.ComponentModel.CancelEventArgs

VB suggests I chane the line:

RaiseEvent AfterPasswordChanged(Me, EventArgs.Empty)

to

RaiseEvent AfterPasswordChanged(Me, CType(EventArgs.Empty, CancelEventArgs))

But I dont understand why this is. CancelEventArgs inherit from EventArgs, so isnt this a narrowing conversion because there may be properties/methods in the CancelEventArgs which are not in the base class?

If anyone can explain I would appreciate it.

Regards

P

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             Public Event BeforeLogin As CancelEventHandler
    Public Event AfterLogin As CancelEventHandler
    Public Event BeforeUserNameChanged As UserNameChangingEventHandler
    Public Event AfterUserNameChanged As EventHandler
    Public Event BeforePasswordChanged As CancelEventHandler
    Public Event AfterPasswordChanged As CancelEventHandler
    Public Event InvalidPassword As EventHandler
 
    Public Property Password() As String
        Get
            Password = _Password
 
        End Get
        Set(ByVal value As String)
            If value Like "*[!A-Za-z]*" Or Trim(value).Length = 0 Then
                RaiseEvent InvalidPassword(Me, EventArgs.Empty)
            Else
                If value <> _Password Then
                    Dim e As New CancelEventArgs
                    RaiseEvent BeforePasswordChanged(Me, e)
                    If e.Cancel = False Then
                        _Password = value
                        RaiseEvent AfterPasswordChanged(Me, EventArgs.Empty) ' Error appearing here
                    End If
 
                End If
            End If
        End Set
    End Property

           
         

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Option Strict on causing Event code to fail

Asked by p_love in Microsoft Visual Basic.Net, .NET Framework 2.x

Tags: Visual Basic.net, 2.0, Option Strict On disallows implicit conversion from System.EventArgs to System.ComponentModel.CancelEventArgs

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