Question

How to replace char in a string by index with VB.NET

Answer 1

Imports System
Imports System.Text
   
Public Class Test
    Public Shared Function replace_char(s As String, idx as Integer, ch as Char) As String
        Dim len As Integer = s.Length
         
        If (idx < 0 Or idx > len) Then
            return s
        End If
         
       	Dim sb As StringBuilder = new StringBuilder(s)
   		
		sb(idx) = ch
		
        return sb.ToString()
    End Function
   
    Public Shared Sub Main()
        Dim s As String = "vb.net programming"
         
        s = replace_char(s, 3, "B")
	    Console.WriteLine(s)
	
    End Sub
End Class
   
 
   
' run:
'
' vb.Bet programming
'

 

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