String constructor

The String constructor can be used in VB.NET programs. This allows you to convert a Char array or single char into a String instance.

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.

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 Module
abc
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.

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.