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Concatenate multiple files into single file

Published: 18 Dec 2009 By Harry L

The following code snippet shows how to concatenate multiple files into single file. In this function I am looping through the source file and appending them into the destination file.

Private Sub ConcatenateFiles(ByVal strDestinationFileName As String, ByVal strHeaderText As String, ByVal ParamArray sourceFiles() As String)
        Dim swFileWriter As System.IO.StreamWriter
        Dim stFileReader As System.IO.StreamReader
        Dim strSourceFile As String

Try

'Create the desitnation file
            If File.Exists(strDestinationFileName) = True Then
                File.Delete(strDestinationFileName)
            End If
            swFileWriter = New System.IO.StreamWriter(strDestinationFileName, True)

For Each strSourceFile In sourceFiles
                'Write the header string on the top of each file contents
                swFileWriter.WriteLine(strHeaderText)
                Try
                    'Open the source file in read mode
                    stFileReader = New System.IO.StreamReader(strSourceFile)
                    'Append content of the current file in the destination file
                    swFileWriter.Write(stFileReader.ReadToEnd() & Environment.NewLine)
                Finally
                    If Not stFileReader Is Nothing Then
                        stFileReader.Close()
                        stFileReader = Nothing
                    End If
                End Try
            Next
        Catch ex As Exception
            'Handle Exception here
        Finally
            'Close swFileWriter stream
            If Not swFileWriter Is Nothing Then
                swFileWriter.Flush()
                swFileWriter.Close()
                swFileWriter = Nothing
            End If

End Try
    End Sub

File Concatenate

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Concatenate multiple files into single file