如何将用 ~ 分隔的文本文件解析为 VB.Net 中的数据表或数组

Question

我正在尝试将文本文件解析为数组或数据表，其中以 D、O 和 L 开头的行是单行数据。

“L”行永远不会超过 1 个。

我想将其放入列标题名称（位置）所在的数据表或二维数组中

• 日期 {D3}
• 客户名称 {O2}
• 地址 {O3}
• 城市 {O7}
• 状态 {O8}
• 邮政编码 {O9}
• 参考 ID {D17}
• 金额 {D20}

我试过了

TextFieldParser("C:\Users\MyAccount\test.txt")
FileReader.SetDelimiters("~")

但我不明白如何处理输出。有什么想法吗？

B~AAA~~12/03/19~12/03/19~1~428.51~APV~REF~K8~~
D~AAA~~12/03/19~12/03/19~APV~REF~N~REFUNDCIS~~12/03/19~0~N~N~Y~~~0000244909~~~72.90~~~00~N~0~12/03/19~0~12/03/19~12/03/19~0~K8~~~N~N~0~
O~JOHN DOE~ 1000 NOAKY LN   ~~~~DETROIT~MI~31000~~~
L~01~141011~000~00000~000~00~000~~REFUND0000244909JOHN DOE~72.90~N~N~~~N~
D~AAA~~12/03/19~12/03/19~APV~REF~N~REFUNDCIS~~12/03/19~0~N~N~Y~~~0000404236~~~101.42~~~00~N~0~12/03/19~0~12/03/19~12/03/19~0~K8~~~N~N~0~
O~BRUCE DOE~UNIT 1 1000 E MICHIGAN AVE   ~~~~DETROIT~MI~31000~~~
L~01~141011~000~00000~000~00~000~~REFUND0000404236BRUCE DOE~101.42~N~N~~~N~
D~AAA~~12/03/19~12/03/19~APV~REF~N~REFUNDCIS~~12/03/19~0~N~N~Y~~~0000436750~~~180.00~~~00~N~0~12/03/19~0~12/03/19~12/03/19~0~K8~~~N~N~0~
O~JOEL DOE~ 100 MICHIGAN AVE   ~~~~DETROIT~MI~31000~~~
L~01~141011~000~00000~000~00~000~~REFUND0000436750JOEL DOE~180.00~N~N~~~N~
D~AAA~~12/03/19~12/03/19~APV~REF~N~REFUNDCIS~~12/03/19~0~N~N~Y~~~0000448122~~~74.19~~~00~N~0~12/03/19~0~12/03/19~12/03/19~0~K8~~~N~N~0~
O~JOHN DOE~ 100 MICHIGAN AVE   ~~~~DETROIT~MI~31000~~~
L~01~141011~000~00000~000~00~000~~REFUND0000448122JOHN DOE~74.19~N~N~~~N~

Answer 1

首先我从 MS 文档 https://docs.microsoft.com/en-us/dotnet/api/microsoft.visualbasic.fileio.textfieldparser?view=netcore-3.1 中获取代码 我需要知道数据表中需要多少列。

Private Sub OpCode1()
    Dim maxColumnCount As Integer
    Using MyReader As New TextFieldParser("C:\Users\xxx\test.txt")
        MyReader.TextFieldType = FieldType.Delimited
        MyReader.Delimiters = {"~"}
        Dim currentRow As String()
        'Loop through all of the fields in the file. 
        'If any lines are corrupt, report an error and continue parsing. 
        While Not MyReader.EndOfData
            Try
                currentRow = MyReader.ReadFields()
                ' Include code here to handle the row.
                If currentRow.Count > maxColumnCount Then
                    maxColumnCount = currentRow.Count
                End If
            Catch ex As Microsoft.VisualBasic.FileIO.MalformedLineException
                MsgBox("Line " & ex.Message & " is invalid.  Skipping")
            End Try
        End While
    End Using
    MessageBox.Show(maxColumnCount.ToString)
End Sub

获得所需的列数后，我创建了一个DataTable 并添加了必要的列数。然后，在示例指示您处理该行的地方，我将该行添加到DataTable。最后，我在DataGridView 中显示了DataTable。

Private Sub OPCode()

    Dim dt As New DataTable
    For i = 1 To 38
        dt.Columns.Add(i.ToString)
    Next

    Using MyReader As New TextFieldParser("C:\Users\xxx\test.txt")
        MyReader.TextFieldType = FieldType.Delimited
        MyReader.Delimiters = {"~"}
        Dim currentRow As String()
        'Loop through all of the fields in the file. 
        'If any lines are corrupt, report an error and continue parsing. 
        While Not MyReader.EndOfData
            Try
                currentRow = MyReader.ReadFields()
                ' Include code here to handle the row.

                dt.Rows.Add(currentRow)

            Catch ex As Microsoft.VisualBasic.FileIO.MalformedLineException
                MsgBox("Line " & ex.Message & " is invalid.  Skipping")
            End Try
        End While
    End Using

    DataGridView1.DataSource = dt
End Sub

更具体到您的数据...

Private Sub OpCode()

    Dim dt As New DataTable

    dt.Columns.Add("Date", GetType(Date))
    dt.Columns.Add("Customer Name", GetType(String))
    dt.Columns.Add("Address", GetType(String))
    dt.Columns.Add("City", GetType(String))
    dt.Columns.Add("State", GetType(String))
    dt.Columns.Add("Zipcode", GetType(String))
    dt.Columns.Add("RefID", GetType(String))
    dt.Columns.Add("Amount", GetType(Decimal))

    Dim DataDate As Date
    Dim RefID As String = ""
    Dim Amount As Decimal

    Using MyReader As New TextFieldParser("C:\Users\maryo\test.txt")
        MyReader.TextFieldType = FieldType.Delimited
        MyReader.Delimiters = {"~"}
        Dim currentRow As String()
        'Loop through all of the fields in the file. 
        'If any lines are corrupt, report an error and continue parsing. 
        While Not MyReader.EndOfData
            Try
                currentRow = MyReader.ReadFields()
                ' Include code here to handle the row.
                If currentRow(0) = "D" Then
                    DataDate = CDate(currentRow(3))
                    RefID = currentRow(17)
                    Amount = CDec(currentRow(20))
                End If
                If currentRow(0) = "O" Then
                    dt.Rows.Add({DataDate, currentRow(1), currentRow(2), currentRow(6), currentRow(7), currentRow(8), RefID, Amount})
                End If
            Catch ex As Microsoft.VisualBasic.FileIO.MalformedLineException
                MsgBox("Line " & ex.Message & " is invalid.  Skipping")
            End Try
        End While
    End Using
    DataGridView1.DataSource = dt
End Sub

我假设 D 行适用于以下 O 行。我将 D 行的数据保存在 3 个变量中，并在读取下一行时使用。

记住集合（包括数组）在 .net 中为零。