将Excel转换为CSV以及读取CSV到数据表时如何包含逗号

Question

我试图通过将Excel数据提取到Datatable并将其导入到CSV来将Excel转换为CSV。 但是我在构建CSV时用空格/空字符替换了逗号。 如果Excel数据字段包含逗号，如何包含逗号？ 我不想将其替换为该字段的其他任何字符/包括双引号。

这是我的代码：

        command = New OleDbCommand("SELECT * FROM [" + SheetName + "$]", connection)

        command.CommandType = CommandType.Text

        writer = New StreamWriter(targetFile)

        dataAdapter = New OleDbDataAdapter(command)

        Dim dataTable As System.Data.DataTable = New System.Data.DataTable()

        dataAdapter.Fill(dataTable)

        Dim columnString As StringBuilder = New StringBuilder()
        Dim column As Integer

        For column = 0 To dataTable.Columns.Count - 1

            If column = dataTable.Columns.Count - 1 Then

                columnString.Append(dataTable.Columns(column).ToString())

            Else

                columnString.Append(dataTable.Columns(column).ToString() + ",")

            End If

        Next

        writer.WriteLine(columnString)

        Dim row As Integer
        Dim rowString As StringBuilder

        For row = 0 To dataTable.Rows.Count - 1


            rowString = New StringBuilder()

            For column = 0 To dataTable.Columns.Count - 1

                If column = dataTable.Columns.Count - 1 Then

                    rowString.Append(dataTable.Rows(row)(column).ToString().Replace(",", ""))


                Else

                    rowString.Append(dataTable.Rows(row)(column).ToString().Replace(",", "") + ",")

                End If

            Next

            writer.WriteLine(rowString)
        Next

如果我需要通过逗号将csv行拆分为datatable，还应如何将数据从CSV读取到Datatable。

这是我的代码：

 Using sr As StreamReader = New StreamReader(sourceFileFullName)

        While Not sr.EndOfStream

            Dim line = sr.ReadLine()

            If Not String.IsNullOrEmpty(line) Then

                If Not RowCount = 0 Then
                    chunkRowCount = chunkRowCount + 1
                    '//var chunkDataTable = ; //Code for filling datatable or whatever  
                    dt1.Rows.Add()

                    Dim i As Integer = 0
                    Dim Cell As String
                    For Each Cell In line.Split(",")

                        If (String.IsNullOrEmpty(Cell)) Then

                            dt1.Rows(dt1.Rows.Count - 1)(i) = DBNull.Value
                            i = i + 1

                        ElseIf Cell = "00.00.0000" Then

                            dt1.Rows(dt1.Rows.Count - 1)(i) = DBNull.Value
                            i = i + 1

                        Else

                            dt1.Rows(dt1.Rows.Count - 1)(i) = Cell
                            i = i + 1
                        End If
                    Next
                End If

                RowCount = RowCount + 1

                If chunkRowCount = 100000 Then

                    chunkRowCount = 0
                    Yield dt1
                    dt1.Clear()
                End If
            End If
        End While