Replace a String containing a " - vb.net

Question

I have run into a problem trying to get this code to work:
filereader.Replace(Chr(34) & "SomeSetting" & Chr(34) & "=dword:00000000", Chr(34) & "SomeSetting" & Chr(34) & "=dword:00000001")
I want it to replace a string which is !exaclty! looking like this, containing the quotation marks:
"SomeSetting"=dword:00000000
but what it does is looking for this string:
""SomeSetting""=dword:00000000
and i cant get it to work. Even if i tried this:
Dim Test As String = Chr(34)
Test will look like this:
""
instead of "
what am i missing here?

Answer 1

I think I see your problem... This is a quite common, accidental thing for people to do.
Strings are immutable, which means that once you've created them they cannot be changed without creating a new string instance.
The problem is this:
filereader.Replace(Chr(34) & "SomeSetting" & Chr(34) & "=dword:00000000", Chr(34) & "SomeSetting" & Chr(34) & "=dword:00000001")
The Replace() function returns the new string with the replaced value(s) (since it cannot change the original one), but you never use the instance it returns.
You should set your old string variable to the new string returned by Replace(), like this:
filereader = filereader.Replace(Chr(34) & "SomeSetting" & Chr(34) & "=dword:00000000", Chr(34) & "SomeSetting" & Chr(34) & "=dword:00000001")
To avoid (or at least minimize the risk of) things like this happening, make sure you read the information that Visual Studio's IntelliSense shows you when writing the function call.
If you do bump into problems anyway, make sure to check the MSDN documentation to see if you missed anything. They usually also have examples showing how you can use the methods.