Changes to Programming Elements
VB .NET has removed support for several programming elements because the underlying .NET Framework class library and the Common Language Runtime (CLR) contain equivalent functionality. Here are the victims and their replacements. (We discuss the class library and CLR in Chapter 4 and Chapter 5.)
Constants
The Microsoft.VisualBasic.Constants class in
the Base Class Library defines a number of constants, such as the
familiar vbCrLf
constant, so these can be used as
always. However, some constants, such as the color constants
vbRed
and vbBlue
, are no longer
directly supported. Indeed, the color constants are part of the
System.Drawing namespace’s Color
structure,
so they are accessed as follows:
Me.BackColor = System.Drawing.Color.BlanchedAlmond
In most cases, to access a particular constant that is not a field in
the Microsoft.VisualBasic.Constants class, you must designate the
enumeration (or structure) to which it belongs, along with the
constant name. For example, the vbYes
constant in
VB 6 continues to exist as an intrinsic constant in VB .NET. However,
it has a counterpart in the MsgBoxResult
enumeration, which can be accessed as follows:
If MsgBoxResult.Yes = MsgBox("OK to proceed?", ...
For a list of all built-in constants and enums, see Appendix D.
String Functions
The
LSet
and
RSet
functions have been replaced by the
PadLeft
and PadRight
methods of the System.String class. For instance, the following code pads the name “Donna” with spaces on ...
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