ProgTips

What output would you expect from such a piece of code (VB.net, of course):

Imports System.Globalization …. Dim CurrentCalendar As System.Globalization.Calendar = _ CultureInfo.CurrentUICulture.Calendar

‘We want to [...]

In an earlier article I’ve been talkin about how to check if a user belongs to a specific domain group. However, the code in that article doesn’t work on local groups and WinNT ADSI provider. I’ve made an update to the code posted there, this should work both on domain and local groups.

Usage:

If IsUserInGroup(“Contoso\JohnDoe”, “Contoso\Managers”) [...]

A naivist-approach solution to check if a user belongs to a particular domain group.

Whenever you see something like this you should come to an idea something is wrong (for instance, the guy who wrote this is still alive):

‘month names in Latvian Dim sMonth() As String = _ {“Janvāris”, “Februāris”, “Marts”, “Aprīlis”, _ [...]

What if we need to save the value of an instance of an enumeration (Enum) as string and then get back the value again?

For instance, we have the following code:

Dim eDay As System.DayOfWeek = DayOfWeek.Monday

So now we can get a textual representation of eDay using the built-in ToString() method:

MessageBox.Show(eDay.ToString())

This yields a messagebox saying “Monday”. But [...]

We all know that the concatenation operator & is evil when you use it intensively. We know writing like this is no good:

Dim s as String = “” s &= “<” s &= spFieldName s &= “>” s &= spFieldValue s &= “</” s &= spFieldName s &= “>”

This is no good because a new String object is being created for every [...]

Par VB.Net String klases metodēm TrimStart() un TrimEnd()

Starp citu … VB6 skaitījās sliktais stils rakstīt šādi:

Dim i, j As Integer

Šādas deklarācijas rezultātā i bija ar tipu Variant, bet j bija Integer (nevis kā varētu šķist, abi Integer).

Toties VB.net šī pieeja ir tiek atbalstīta un saprasta tieši tā, kā tā izskatās.

Mēģinām augšuplādēt (upload) failu ASP.net lapā. Priekš tam lapas kodā jāievieto apmēram šāds:

<input id=”myFile” type=”file” runat=”server” /> <input type=button id=”cmdUp” runat=”server” />

Pēc tam varam ķert notikumu, kad nospiesta upload poga. Pēc MSDN rādītā piemēra, pietiek pārbaudīt vai UploadedFile atribūts nav nothing, tas ir, šādi:

Private Sub Uploads (ByVal s As System.Object, ByVal e As [...]

Pastāstīšu, cik viegli vai grūti ir programmatiski darboties ar MS Exchange objektiem, no koda “lasīt” e-pastu un tamlīdzīgi.