replace values using ascci table

Posted on 2014-10-31
Last Modified: 2014-11-05

My code uses the String.Replace method to replace various characters that the browser cannot interpret due to encoding

group.Name.Replace("½", "½").Replace("¼", "¼").Replace("¾", "¾").Replace("°", "°").Replace("Â", "")

I know it does not look pretty, and that is why I would like to ask if it would be possible to use a subroutine in an utility class, with an array containing all ascci values from a table like in this page:, and then call it from anywhere in my program.

I am not verse in coding something like this, but with a bit of help and guidance I can dare to give it a try.

If anyone could give me a hand with starting the code, if not asking to much, that would be great.
Or at least some direction on how to best approach this issue.

Thank you kindly.
Question by:metropia
LVL 33

Accepted Solution

it_saige earned 350 total points
ID: 40416597
It really wouldn't be that difficult to use an extension method to do this, you would just use a switch statement to replace the found character with the encoded string.

Something like:
Module Extensions
	<System.Runtime.CompilerServices.Extension()> _
	Public Function ToHTMLEncoded(ByVal StringIn As String) As String
		Dim result As String = String.Empty
		For Each character As Char In StringIn
			Select Case character
				Case "¼"
					result = String.Format("{0}&#188;", result)
				Case "½"
					result = String.Format("{0}&#189;", result)
				Case "¾"
					result = String.Format("{0}&#190;", result)
				Case "—"
					result = String.Format("{0}&#151;", result)
				Case Else
					result = String.Format("{0}{1}", result, character)
					Exit Select
			End Select
		Return result
	End Function
End Module

Public Module Module1
	Public Sub Main()
		Dim teststring As String = "I had a brown cow that was ¼ blind and ½ deaf."
	End Sub
End Module

Open in new window

Produces the following output:Capture.JPG
This should get you started.

LVL 35

Assisted Solution

by:Miguel Oz
Miguel Oz earned 25 total points
ID: 40417630
Most of the conversion should be done by HtmlEncode method from System.Net namespace, but given the fact that there is one letter(Â) that is not encoded(but set the empty string), you code needs to be modified as follows:
group.Name = WebUtility.HtmlEncode(group.Name.Replace("Â", "")) 

Open in new window

LVL 28

Assisted Solution

Ark earned 125 total points
ID: 40417828
Public Function StringToHTML(ByVal input As String) As String
    Return String.Join("", input.ToCharArray.Select(Function(c) CharToHtml(c)).ToArray)
End Function
Private Function CharToHtml(ByVal c As Char) As String
    Dim val = Convert.ToInt32(c)
    Dim ret As String
    If val > 127 Then 
        'Add more check here if need (for example for "Â")
        'If val>190 Then Return ""
        ret = "&#" & val & ";"
        ret = c.ToString
    End If
    Return ret
End Function

Open in new window

Using: MsgBox(StringToHTML("string to ½ html ¼test¾"))

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