Count the number of occurrences of each character in a string, ignoring CRs

I'm scanning through all characters in a textbox. Then the progr开发者_C百科am counts how many of each character is in the textbox. Here's the code which adds all characters to a list:

For each c as char in TxtBox
    list.add(c)
Next

Everything's working fine, except this will also add returns to the list, which I don't want. I thought I could write like this:

If c <> chr(10) Then
    list.add(c)
End If

...but it's not working. Any ideas?

You would also need to exclude chr(13). 10 = new line, 13 = carriage return.

For each c as char in TxtBox

   if c <> chr(10) and c <> chr(13) then
      list.add(c)
   end if

Give that a shot.

In Windows, both LF = LineFeed = Chr(10) and CR = Carriage Return = Chr(13) are inserted as return character.

This comes from (old) dot-matrix printers.

LineFeed = Move one line down
Carriage Return = Move to the begin of the current line

They are both included in the Environment.NewLine property.

So your code should be something like:

 If Environment.NewLine.IndexOf(c) < 0 Then
    list.Add(c)
 End If

This way your are sure your code also works on OS'es that use different characters for newline.

Well, there are already lots of answers, but the way I would have done it is as follows:

For Each c As Char In TextBox1.Text.Replace(vbCrLf, "")
    List.Add(c)
Next

I don't know what your "List" variable is, but if it's of a List type, or of type ListBox.ObjectCollection, or of many other types, you could probably replace this loop with:

List.AddRange(TextBox1.Text.Replace(vbCrLf, "").ToCharArray())

...just for the fun of it!

Use the http://msdn.microsoft.com/en-us/library/system.char.iswhitespace.aspx

Char.IsWhiteSpace