[RESOLVED] didn't replace the charater using .replace()

[AustinLeung]

here's the code:

If RichTextBox4.Text.Contains(vbLf) Then
      RichTextBox4.Text.Replace(vbLf, "")
End If

I tried to add a break-point in it and shows it's running properly. But the results still have vbLf char in it.
how can i solve it?

[si_the_geek]

The Replace method is one of those where you need to assign the result, eg:

If RichTextBox4.Text.Contains(vbLf) Then
      RichTextBox4.Text = RichTextBox4.Text.Replace(vbLf, "")
End If

Note however that as this is modifying the .Text property, any formatting will be lost.


Also note that this will only remove LF characters, any CR characters (which have almost the same effect as LF) will still be there.

[jmcilhinney]

The documentation for the String.Replace method says this:

This method does not modify the value of the current instance. Instead, it returns a new string in which all occurrences of oldValue are replaced by newValue.

That's why you should always read the relevant documentation if something doesn't seem to work the way you expect.

[Sitten Spynne]

This is true of basically anything related to Strings in .NET. They are "immutable reference types" which means they sometimes behave more like structs, even though they're not structs. The "immutable" part means once you create a string, you can't change it. You can only create a new string. So the Replace() function builds the new string and returns it. It can't do anything to the string it's called on.

[AustinLeung]

thanks. now i can using the value properly.