VB.NET - String PadRight and PadLeft

PadLeft example. This program creates an array filled with 3 Strings. It then loops over these Strings. Each String has up to five characters of padding added to the left.

And This new String returned by PadLeft is then passed to Console.WriteLine.

Info PadLeft does not modify the String data. Instead it creates a modified String in new memory.

So This means the String Dim you call it on—in this program "w"—is not modified in any way.

For

Module Module1 Sub Main() Dim words() As String = {"A", "Net", "Perls"} ' Loop over words. For Each w As String In words Console.WriteLine(w.PadLeft(5)) Next End Sub End Module

A Net Perls

PadRight example. The PadLeft Function is paired with PadRight. Here we add complexity by using a Dictionary collection. For keys we use Strings. For values we use Integers.

Dictionary

Integer

Here We loop over the Dictionary and apply padding to the Key. For the value we first convert the Integer to a String.

KeyValuePair

Module Module1 Sub Main() ' Create Dictionary. Dim dict As Dictionary(Of String, Integer) = New Dictionary(Of String, Integer) dict.Add("Cat", 5) dict.Add("Mouse", 1) dict.Add("Leopard", 9) dict.Add("Asp", 10) ' Loop over pairs. For Each pair As KeyValuePair(Of String, Integer) In dict ' Pad right of key. Console.Write(pair.Key.PadRight(10)) ' Pad left of value. Console.WriteLine(pair.Value.ToString().PadLeft(2)) Next End Sub End Module

Cat 5 Mouse 1 Leopard 9 Asp 10

Example 3. PadLeft and PadRight can add any Char value you like. In this program we use a period as the second argument to PadRight. And for PadLeft we pass a hash sign.

And The output String contains padding with these special characters, not spaces.

Module Module1 Sub Main() ' Pad with . and # Console.Write("Sam".PadRight(10, "."c)) Console.WriteLine("28173".PadLeft(6, "#"c)) ' Next line. Console.Write("Mark".PadRight(10, "."c)) Console.WriteLine("137".PadLeft(6, "#"c)) End Sub End Module

Sam.......#28173 Mark......137

Summary. Text-based display of data is common. It is an easy way to format tables in console programs. PadLeft and PadRight help in code that displays numeric data.

Dot Net Perls is a collection of tested code examples. Pages are continually updated to stay current, with code correctness a top priority.

Sam Allen is passionate about computer languages. In the past, his work has been recommended by Apple and Microsoft and he has studied computers at a selective university in the United States.

This page was last updated on Jan 4, 2024 (edit).

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