Visual Basic 2005 - Language Summary v2
Assume:
Private rand As Random = new Random
| s = | String.Empty |
String.Empty is the same as "". |
| s2 = | s.ToUpper |
Create new string all in upper case. |
| s2 = | s.ToLower |
Create new string all in lower case. |
| b = | String.IsNullOrEmpty(s) |
True if s is null or empty. |
| b = | type.TryParse(s, var) |
Converts s to type, assigns to var. Returns false if bad input. |
x | n = | Val(s) |
Use datatype.TryParse(s, v) instead. |
| s = | n.ToString() |
Converts n to a string. |
| s = | n.ToString(fmt) |
Convert n to a string using string format fmt.
fmt is a code character optionally followed by a digit indicating number of digits to the right of
decimal point to display. If no digit specified, the default is 2.
Codes: "C" currency, "D" decimal integer (no decimal point), "F" fixed point, "N" number, "P" percent.
|
x | s = | Format(n, "currency") |
Use n.ToString("C") instead. |
x | s = | Convert.ToString(n) |
Use n.toString() or n.ToString(fmt) instead. |
| d = | Financial.Pmt(Rate, NPer, PV [,FV, DUE]) |
Calculates loan payments. See p 337. |
| i = | rand.next(min, upto) |
Random integer in range min up to but not includeing upto. |
Selection statements
If ... Then
. . .
End If
|
If ... Then
. . .
Else
. . .
End If
|
If ... Then
. . .
ElseIf ... Then
. . .
ElseIf ... Then
. . .
Else
. . .
End If
|
Select Case ...
Case v1
. . .
Case v2, v3
. . .
Case v4 To v5
. . .
Case Is comparison v6
. . .
Case Else
. . .
End Select
|
Subroutines, procedures, methods, functions, ...
Private Sub name(params,...)
. . .
End Sub
|
Loops: For...Next, Do...Loop
For cntr [As type] = start To end [Step stepval]
. . .
'Exit can be used inside to terminate loop.
Next cntr
|
Do {While | Until} cond
. . .
Loop
|
Do
. . .
Loop {While | Until} cond
|
Other
Types | Integer, Double, Decimal, String, Boolean . |
Declarations | Dim, Private, Static, Const . |
Constants | ControlChars.NewLine, String.Nothing . |
Like patterns | ? (one char), * (zero or more chars), # (digit), [...] (chars in set), [!...] (chars not in set) |
Operators
Arithmetic Ops | + - * / \ mod ^ |
String Ops | & Like |
Comparison Ops | = > >= < <= <> Is (object equality) |
Logical Ops | AndAlso OrElse Not And Or Xor |
Other Ops | = TypeOf |