LSet, RSet. LSet and RSet are string padding Functions. They allow you to pad the right (LSet) and left (RSet) sides of a string with spaces.
Here we look at these VB.NET functions in more detail. Usually in VB.NET we prefer PadRight and PadLeft on strings—these are more common because they are used in C#.
First example. Let's begin by looking at the LSet and RSet in a program. We see that the string returned by LSet is padded to 20 characters total by adding spaces to the right.
And The string returned by RSet, meanwhile, is padded to 20 characters total by adding spaces to the left.
Module Module1
Sub Main()
' Use LSet and RSet.
Console.WriteLine("[{0}]", LSet("abcd", 20))
Console.WriteLine("[{0}]", RSet("abcd", 20))
Console.WriteLine("[{0}]", LSet("abcd", 2))
Console.WriteLine("[{0}]", RSet("abcd", 2))
End Sub
End Module[abcd ]
[ abcd]
[ab]
[ab]
Internals. The implementation of LSet and RSet in the Microsoft.VisualBasic.dll is simple. LSet internally calls PadRight. RSet internally calls PadLeft.
However LSet and RSet are more complex than just the pad methods. The implementation has a path that calls Substring.
Internals, substring. These functions call Substring if you specify that the string be reduced below its current length. So they either pad or truncate.
Summary. We looked at LSet and RSet. We peeked inside the Visual Basic implementation. These functions truncate or pad strings without any If-statements added directly to your code.
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This page was last updated on Sep 16, 2024 (edit).