VB.NET - String Remove - Dot Net Perls

Remove. This VB.NET function, part of the String class, makes a String shorter. It eliminates all characters starting at a specified position in the String.

Notes, Remove. With the Remove Function, we can take off any number of characters starting at an index. It is a special form of the Substring() Function.

String Substring

String Insert

First example. We declare a String with some characters on the end we want to remove. Then with LastIndexOf, we find the index of the last space character.

String LastIndexOf

Here We call Remove with one argument. This indicates where the string will be stopped.

Tip All characters following that position are eliminated. This is how a SetLength function on the String type would work.

Detail The Length of the String will always be equal to the argument passed to Remove (if valid).

String Length

Module Module1 Sub Main() Dim value As String = "bird frog dog" ' Find position of last space. Dim index As Integer = value.LastIndexOf(" "c) ' Remove everything starting at that position. value = value.Remove(index) Console.WriteLine("REMOVE RESULT: {0}", value) End Sub End Module

REMOVE RESULT: bird frog

Range example. We can specify a count. Only the number of characters specified as the count are removed. Characters following this range are kept in the String.

Argument 1 This is an Integer that indicates the starting index of the range of characters we want to remove.

Argument 2 This is the count of chars (part of the range) we want to remove. It is not an end index.

Module Module1 Sub Main() Dim value As String = "abcde" ' Remove 2 chars starting at index 1. Dim removed As String = value.Remove(1, 2) Console.WriteLine("RESULT: {0}", removed) End Sub End Module

RESULT: ade

Implementation. Remove() with 1 argument calls into Substring() with an argument of 0. Substring specifies the character range to keep, while Remove specifies the range to discard.

Tip Because of this implementation, it is somewhat faster to directly call the Substring function.

Detail There is a Remove() function on the StringBuilder type. This avoids string copies, and is sometimes faster.

StringBuilder

A summary. We used the Remove function. While Substring specifies the characters we want to keep in a new string, Remove specifies the characters we want to discard.

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This page was last updated on Nov 9, 2021 (image).

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