vb.net 下的 CSV文件操作

常见CSV文件的操作

Private Function ExportCsvProcess(ByVal FilePath As String ByVal, dt As DataTable) As Boolean
Dim fileStream As System.IO.FileStream
Dim streamWriter As System.IO.StreamWriter
Dim intRow, intCol As Integer
Dim strRow As String

'刪除舊CSV文件
If (System.IO.File.Exists(FilePath)) Then
System.IO.File.Delete(FilePath)
End If

Try
fileStream = New FileStream(FilePath, System.IO.FileMode.CreateNew, System.IO.FileAccess.Write)
If Not dt Is Nothing Then
streamWriter = New StreamWriter(fileStream, System.Text.Encoding.Default)
strRow = ""
'讀列名
For intCol = 0 To dt.Columns.Count - 1
strRow += dt.Columns(intCol).ColumnName
If intCol < dt.Columns.Count - 1 Then
strRow += ","
End If
Next
streamWriter.WriteLine(strRow)
'讀每行的值
For intRow = 0 To dt.Rows.Count - 1
strRow = ""
For intCol = 0 To dt.Columns.Count - 1
strRow += CStr(dt.Rows(intRow).Item(intCol))
If intCol < dt.Columns.Count - 1 Then
strRow += ","
End If
Next
streamWriter.WriteLine(strRow)
Next
streamWriter.Close()
End If
Catch ex As Exception
MessageShow(ex.ToString())
Return False
Finally
fileStream.Close()
End Try
Return True
End Function

 

必要时可以进行特殊字符的过滤

Private Function DelSpacChr(ByVal str As String) As String
Dim i As Integer
Dim result As String = str
Dim strSpac() As String = {"~", "!", "@", "#", "$", "%", "^", "&", "*", "(", ")", "`", ";", "'", ",", ".", "/", ":", "/,", "<", ">", "?"}
For i = 0 To i < strSpac.Length
If result.IndexOf(strSpac(i)) > -1 Then
result = result.Replace(strSpac(i), "")
End If
Next
Return result
End Function

 

 

下面是从CSV导入到DataTable，当然还可以像上面一样使用文件流操作，但这里采用OLEDB类操作。

 

Public Function CSVToDataTable(ByVal FilePath As String) As DataTable
        Try
            If (System.IO.File.Exists(FilePath)) Then
                Dim fi As New System.IO.FileInfo(FilePath)
                'HDR=NO 第一行當數據處理
                'HDR=YES(默認）第一行當列處理
                Dim sConnectionString As String = "Provider=Microsoft.Jet.OLEDB.4.0;Extended Properties='Text;HDR=NO';Data Source=" & fi.DirectoryName
                Dim objConn As New System.Data.OleDb.OleDbConnection(sConnectionString)

                objConn.Open()

                Dim strColum As String
                Dim objCmdSelect As New Data.OleDb.OleDbCommand("SELECT Distinct * FROM " & fi.Name, objConn)
                Dim objAdapter As New Data.OleDb.OleDbDataAdapter
                Dim dt As New DataTable

                objAdapter.SelectCommand = objCmdSelect
                objAdapter.Fill(dt)
                objConn.Close()
                Return dt
            End If
        Catch ex As Exception
            MessageShow(ex.ToString())
            Return Nothing
        End Try
    End Function

 

OK，操作完畢。