Strings
String is a sequence of characters enclosed in double quotes.
How to declare strings
String keyword is used to declare strings and it is an alias for the System.String class.
Below is the syntax:
Dim variableName As String
How to initialize strings
Dim Name As String = "OneCompiler"
String Functions
VB.net provides various in-built string functions which can manipulate strings. Some of the frequently used string functions are listed below:
| Function name | Description |
|---|---|
| str.Length | to return the length of string str |
| string.Concat(str1,str2) | to concatenate two strings str1 and str2 |
| Copy(str1, str2) | To copy string str2 into string str1. |
| String.Compare(str1, str2) | returns 0 if str1 and str2 are the same and less than 0 if str1 < str2 and a positive number if str1 > str2 |
| Str.Contains("value") | checks for the value in str |
| Str.Substring(start_Index, length) | Used to return a part of a specified string |
| Join(str, String()) | concatenate all the elements of the given string array with the specified separator between each element. |
| Split(Char()) | splits a string into substrings based on the characters in an array |
| str.ToUpper() | converts the string to upper case |
| str.ToLower() | converts the string to lower case |
| ToString() | to return instance of a string |
| Trim() | removes all leading and trailing whitespaces from a given string |
| Clone() | returns a reference to this instance of String |
Examples
Public Module Program
Public Sub Main(args() As string)
Dim str as String = "OneCompiler"
Console.WriteLine("The length of the string is: " & str.Length) 'returns the length of the string
Console.WriteLine(str.ToUpper()) 'converts to upper case
Console.WriteLine(str.ToLower()) 'converts to lower case
Dim str1 as String = "Hello "
Dim str2 as String = "World!"
Console.WriteLine(string.Concat(str1,str2)) 'string concatenation
Dim str3 as String = string.Copy(str1) 'string copy
Console.WriteLine(str3)
Console.WriteLine(string.Compare(str1,str3)) 'string compare
Console.WriteLine(string.Compare(str1,str2)) 'string compare
End Sub
End Module