Q: Newbee question, regarding a couple of syntaxes in c#

[Visual Systems AB \(Martin Arvidsson\)]

Hi!

I was testing an application that is writing a mail and sends it to a
recieptiens. I then came across
a couple of ??? in my head, coul anyone briefly tell me what the difference
is between this and where in the help i can read more about it

First out...

Outlook.Applica tion oApp = new Outlook.Applica tion();
My guess is that this create a new object oApp from this
Outlook.Applica tion? Right?

Then the following, i just don't get, what they do and what it is called...

Outlook.NameSpa ce oNS = oApp.GetNamespa ce("mapi");
(Why not xxx = new xxx)

Outlook.MailIte m oMsg =
(Outlook.MailIt em)oApp.CreateI tem(Outlook.OlI temType.olMailI tem);

Outlook.Recipie nts oRecips = (Outlook.Recipi ents)oMsg.Recip ients;

Thanx in advance for any help

Regards

Martin Arvidsson

[Peter Jausovec]

Hi,

Outlook.NameSpa ce oNS = oApp.GetNamespa ce("mapi");
(Why not xxx = new xxx)

Outlook.MailIte m oMsg =
(Outlook.MailIt em)oApp.CreateI tem(Outlook.OlI temType.olMailI tem);

Outlook.Recipie nts oRecips = (Outlook.Recipi ents)oMsg.Recip ients;
You don't need to create new namespace (therefore there is no xxx = new xxx
:)), but you get the namespace from the outlook application object you
created. Same goes with MailItem -> you call method CreateItem with
parameter which descibes the item you are creating (olMailItem) and because
CreateItem returns object you have to cast that to Outlook.MailIte m.

Hope this helps..

--
Regards,
Peter Jausovec
(http://blog.jausovec.net)
--
Regards,
Peter Jausovec
(http://blog.jausovec.net)
"Visual Systems AB (Martin Arvidsson)" <ma************ **@vsab.net> je
napisal v sporoèilo news:%2******** ********@TK2MSF TNGP15.phx.gbl ... Hi!

I was testing an application that is writing a mail and sends it to a
recieptiens. I then came across
a couple of ??? in my head, coul anyone briefly tell me what the
difference
is between this and where in the help i can read more about it

First out...

Outlook.Applica tion oApp = new Outlook.Applica tion();
My guess is that this create a new object oApp from this
Outlook.Applica tion? Right?

Then the following, i just don't get, what they do and what it is
called...

Outlook.NameSpa ce oNS = oApp.GetNamespa ce("mapi");
(Why not xxx = new xxx)

Outlook.MailIte m oMsg =
(Outlook.MailIt em)oApp.CreateI tem(Outlook.OlI temType.olMailI tem);

Outlook.Recipie nts oRecips = (Outlook.Recipi ents)oMsg.Recip ients;

Thanx in advance for any help

Regards

Martin Arvidsson

[Anders Norås]

> Outlook.Applica tion oApp = new Outlook.Applica tion();

My guess is that this create a new object oApp from this
Outlook.Applica tion? Right?
Yes!
Then the following, i just don't get, what they do and what it is
called...

Outlook.NameSpa ce oNS = oApp.GetNamespa ce("mapi");
(Why not xxx = new xxx)
GetNamespace is a factory method. A factory is a method that creates an
object instance for you based on parameters or other stimuli.
On the inside the GetNamespace method could do something like this:
public NameSpace GetNamespace(st ring ns) {
if (ns=="mapi") return new MapiNamespace() ;
else return new OtherNamespace( );
}

Outlook.MailIte m oMsg =
(Outlook.MailIt em)oApp.CreateI tem(Outlook.OlI temType.olMailI tem);
The CreateItem is another factory method. This method creates the item type
you ask for, in your example an olMailItem. Because the return type of the
factory is a base class you have to cast it to the more specific type
MailItem.
Outlook.Recipie nts oRecips = (Outlook.Recipi ents)oMsg.Recip ients;

Same as above. The Recipients property is casted to a Recipients type.

Anders Norås
blog: http://dotnetjunkies.com/weblog/anoras