Logical Operators Trivia in Vb.Net

Karthik Gopalakrishnan — Sun, 16 Dec 2007 08:22:37 GMT

Is anybody aware of these two keywords OrElse and AndAlso in Vb.Net.

These keywords were introduced in .Net 2.0 .

 Dim myobj As Object If Not IsNothing(myobj) AndAlso myobj.y = 200 Then Console.WriteLine("Hello World")
End If

If the myObj is null or nothing then the If condition shortcircuits and will not validate the condition myObj.y=200 .

I would advise everybody to use the andAlso and orElse. I wonder why it was not introduced a long time back.

C# by default had this feature by the use && and ||.

Serialization Tips

Karthik Gopalakrishnan — Tue, 11 Dec 2007 06:06:46 GMT

Serialization is one of the concepts, that is always intriguing to developers.

One of my coworker, was trying to move the in process session state management into an out of proc session state service. We were getting some exceptions during the transition, of course when objects need to be persisted in a session, they have to serializable and more than that, if it is an aggregated object (object which may have multiple objects encapsulated in it) then a null check should be performed on each object in the serialization / deserialization method definitions.

VB.NET

Public Overrides Sub GetObjectData(ByVal info As System.Runtime.Serialization.SerializationInfo, ByVal context As System.Runtime.Serialization.StreamingContext)

If Not IsNothing(_empobject) Then
        info.AddValue("_empobject", _empobject.Serialize(_empobject))
End If

End sub

Private Sub New(ByVal Info As SerializationInfo, ByVal Context As StreamingContext)

      If Not String.IsNullOrEmpty(Info.GetString("_empobject")) Then
   _empobject = New EmpObject().DeSerialize(Info.GetString("_empobject"))
     End If

End Sub

public override void GetObjectData(System.Runtime.Serialization.SerializationInfo info, System.Runtime.Serialization.StreamingContext context)

{

if ((_empobject != null)) {

info.AddValue("_empobject", _empobject.Serialize(_empobject));

}

private New(SerializationInfo Info, StreamingContext Context)

{

if (!string.IsNullOrEmpty(Info.GetString("_empobject"))) {

_empobject = EmpObject().DeSerialize(Info.GetString("_empobject"));

}

Finally, how do you serialize a generic list ( of any Type). I was thinking about that, and found this article which explains clearly how to do it.

http://www.eggheadcafe.com/software/aspnet/30067316/how-can-i-add-generic-lis.aspx

If you wonder how to xml serialize a generic list, look at the below blog post

http://www.hanselman.com/blog/XmlSerializingAGenericListltgt.aspx

If you want a tool to convert a code from VB to C# , you could use the below link to do that

http://labs.developerfusion.co.uk/convert/vb-to-csharp.aspx

.NET Framework

Logical Operators Trivia in Vb.Net

Serialization Tips