With the New String syntax, you can create String instances much faster than with the equivalent loop constructs. We can use the String constructor after calling ToCharArray.
Example. First, this program is divided into 3 important routines. In the A subroutine, we show how to create a New String from an entire character array.
And In the B subroutine, we show how to create a String by repeating the letter "a" ten times.
Finally In the third subroutine C, we construct a String instance from a range of a Char array.
Result The program's execution shows that all the New String constructors worked as expected.
Module Module1
Sub Main()
A()
B()
C()
End Sub
Sub A()
' Construct string from character array.
Dim array(2) As Char
array(0) = "a"c
array(1) = "b"c
array(2) = "c"c
Dim example As String = New String(array)
Console.WriteLine(example)
Console.WriteLine(example = "abc")
Console.WriteLine()
End Sub
Sub B()
' Construct string from repeated character.
Dim example As String = New String("a"c, 10)
Console.WriteLine(example)
Console.WriteLine(example = "aaaaaaaaaa")
Console.WriteLine()
End Sub
Sub C()
' Construct string from part of character array.
Dim array(5) As Char
array(0) = "a"c
array(1) = "B"c
array(2) = "c"c
array(3) = "D"c
array(4) = "e"c
array(5) = "F"c
Dim example As String = New String(array, 0, 3)
Console.WriteLine(example)
Console.WriteLine(example = "aBc")
End Sub
End Moduleabc
True
aaaaaaaaaa
True
aBc
True
Discussion. The string constructor is different in the C# language and the VB.NET language. VB.NET does not allow you to use the unsafe (pointer-based) methods. The C# language allows you to.
Note This means that VB.NET only has 3 overloads on the constructor, while the C# language presents 8.
A summary. The String constructor provides an essential way to create certain kinds of strings. If you need a string that is based on a range of Char array, the String constructor is ideal.
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This page was last updated on Mar 25, 2022 (edit link).