CODEWITHSUNDEEP
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Hichem
Hichem

Reputation: 1182

how to call public sub from private shared sub vb.net

this is for writing data to same file multithreading 

Dim _readWriteLock As ReaderWriterLockSlim = New ReaderWriterLockSlim

    Private Sub writedatatofile(ByVal s As String)
        ' Set Status to Locked

        _readWriteLock.EnterWriteLock()
        Try
            ' Append text to the file
            Dim sw As StreamWriter = File.AppendText("textfile.txt")
            sw.WriteLine(s)
            sw.Close()
        Finally
            ' Release lock
            _readWriteLock.ExitWriteLock()
        End Try
    End Sub

this is for getting asynchronous response

Private Shared Sub GetResponseCallback(ByVal asynchronousResult As IAsyncResult)
      Dim response As HttpWebResponse = CType(request.EndGetResponse(asynchronousResult),  _
       HttpWebResponse)

writedatatofile(Response.Headers.Tostring)

End Sub

whene i call writedatatofile from GetresponseCallback i get this error : Cannot refer to an instance member of a class from within a shared method or shared member initializer without an explicit instance of the class

how can i write safety multithreads to same text file from asynchronous response ?

Upvotes: 0

Views: 1759

Answers (1)

vcsjones
vcsjones

Reputation: 141638

You cannot call an Instance method from a Shared (static) method. You are basically saying, "I want to call a method that operates on a particular instance of an object from a method that doesn't care about object instances" - so how would the Shared method be able to do that?

You need to change GetResponseCallback to instance (removed the Shared modifier).

Upvotes: 2

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