Looping Through A Text File Using StreamReader Causes A "Cannot Access A Disposed Object."
Feb 15, 2012
I have the following basic code to read a text file from a StreamReader:
Using sr As New StreamReader(FileData)
Dim line As String = String.Empty
Do
'Error occurs on the next line after looping
'past the *last* line in the file...sometimes
line = sr.ReadLine()
'Some code here to parse and process the line
Loop Until (line Is Nothing) OrElse (line = String.Empty)
End Using
I tried changing the Do Loop to Do While Not sr.EndOfStream I tried checking If sr.ReadLine IsNot Nothing and a few other things but I keep getting the Cannot access a disposed object. Object name: 'SslStream' error after all 105 lines have successfully been read and processed. This code has been working for a couple of years, but there seems to be some issue with certain files (recently) that is causing this problem.
I opened the file and I didn't see anything out of the ordinary. No extra blank lines, funny characters or anything of the like. Just a normal file with 105 properly formatted lines. So even know there is something about this file causing the error, I need to obviosly handle this programatically.
What can I do to prevent the sr.ReadLine() line of code from throwing that exception that I have not yet tried?UPDATE Upon reading the last line of the file, the 'EndOfStream' property on the StreamReader goes immdeatly to: EndOfStream: {"Cannot access a disposed object.Object name: 'SslStream'."} It never toggles to 'True'. This makes checking for this condition problematic.
I think I have figured out why this issue only occurs sometimes: if I add in a blank line to the file at the end, none of this ever occurs. It is only when the last line of the file contains data. Still, I should be able to handle this programatically. Telling the vendor supplying the file to always add a blank line at the end should not be the solution.
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cannot access a disposed object
I know that it's not really revelant but i've got that problem on my pc and my collegue that use the same application doesn't received that error.I've already check their configuration and i've the same than us. I supposed there are some problems of compatibilty with the framework or thing like that.
Stacktrace ************** Exception Text ************** System.ObjectDisposedException: Cannot access a disposed object named "Form". Object name: "Form".
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Quote:
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