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Get VS2013 to release a text file

Posted on 2014-10-30
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Last Modified: 2014-10-30
In Win7 VS2013 asp.net, I want to use a text file to provide a variable to my web site, so that I can change the variable externally to the site during run time, to cause the site to run different code paths based on the variable.

But I get a "file in use" message when I try to update the text file.

Any suggestions on how to get around this, or to otherwise create the same effect, would be appreciated.

    Public Shared Function GetTestVar1(ByRef varVarName As String) As String
        Dim rtnVal As String = "not found"
        '-----------------------------------
        Dim p1 As Integer = 0
        Dim p2 As Integer = 0
        Dim l1 As Integer = 0
        Dim varFilePath As String
        varFilePath = "D:\mypath\TestVar.txt"
        Dim varWriter As StreamWriter
        Dim wrkFile As FileStream
        Try
            wrkFile = New FileStream(varFilePath, FileMode.Open, FileAccess.Read)
        Catch
            Return "$ERR$ReadTestVarFile$FilePath =" & varFilePath
            Exit Function
        End Try
        Dim wrkFileReader As StreamReader = New StreamReader(wrkFile)
        Dim n As Integer = 0
        Dim inLine As String
        '----------------------------Read
        While (wrkFileReader.Peek > -1)
            inLine = wrkFileReader.ReadLine
            If InStr(inLine, varVarName) <> 0 Then
                p1 = InStr(inLine, "=")
                If p1 <> 0 Then
                    l1 = Len(inLine)
                    rtnVal = Mid(inLine, p1 + 1, l1 - p1 + 1)
                End If
            End If
        End While
        '--------------------------------
        wrkFileReader = Nothing
        wrkFile = Nothing
        Return rtnVal
    End Function

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Question by:codequest
2 Comments
 
LVL 25

Accepted Solution

by:
chaau earned 2000 total points
ID: 40414820
You should use Using to close the StreamReader, like this:
    Public Shared Function GetTestVar1(ByRef varVarName As String) As String
        Dim rtnVal As String = "not found"
        '-----------------------------------
        Dim p1 As Integer = 0
        Dim p2 As Integer = 0
        Dim l1 As Integer = 0
        Dim varFilePath As String
        varFilePath = "D:\mypath\TestVar.txt"
        Dim varWriter As StreamWriter
        Dim wrkFile As FileStream
        Try
            wrkFile = New FileStream(varFilePath, FileMode.Open, FileAccess.Read)
        Catch
            Return "$ERR$ReadTestVarFile$FilePath =" & varFilePath
            Exit Function
        End Try
        Using wrkFileReader As StreamReader = New StreamReader(wrkFile)
        Dim n As Integer = 0
        Dim inLine As String
        '----------------------------Read
        While (wrkFileReader.Peek > -1)
            inLine = wrkFileReader.ReadLine
            If InStr(inLine, varVarName) <> 0 Then
                p1 = InStr(inLine, "=")
                If p1 <> 0 Then
                    l1 = Len(inLine)
                    rtnVal = Mid(inLine, p1 + 1, l1 - p1 + 1)
                End If
            End If
        End While
        '--------------------------------
        End Using
        wrkFile = Nothing
        Return rtnVal
    End Function
                                  

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Author Comment

by:codequest
ID: 40414869
Sweet!  Many thanks.
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