在vb.net中打印收据

Question

我正在尝试使用vb.net打印上述收据。但是，如图所示，金额数字显示在新行上。我做错了什么？

以下是我使用的代码：

Private Sub PrintDocument1_PrintPage(sender As Object, e As PrintPageEventArgs) Handles PrintDocument1.PrintPage

        Dim offset As Integer = 15
    Dim itemdesc As String = "Item".PadRight(30)
        Dim Pricedesc As String = "Price".PadRight(8)
        Dim qtydesc As String = "Qty".PadRight(5)
        Dim amtdesc As String = "Amount"
        Dim descline As String = itemdesc + Pricedesc + qtydesc + amtdesc
        e.Graphics.DrawString(descline, New Font("Courier New", 8, FontStyle.Regular), Brushes.Black, 25, 100 + offset)
        offset += 10
    Dim startx As Integer = 25
        Dim starty As Integer = 100

        Dim font As New Font("Courier New", 8, FontStyle.Regular)
        Dim item As String
        Dim price As String
        Dim qty As String
        Dim amount As String

    Dim productline As String
        For k As Integer = 0 To dgvSales.RowCount - 2

            item = dgvSales.Rows(k).Cells(1).Value.ToString.PadRight(30)
            price = dgvSales.Rows(k).Cells(3).Value.ToString.PadRight(8)
            qty = dgvSales.Rows(k).Cells(4).Value.ToString.PadRight(5)
            amount = dgvSales.Rows(k).Cells(5).Value.ToString
            productline = item + price + qty + amount
            e.Graphics.DrawString(productline, font, Brushes.Black, startx, starty + offset)
            offset += 20

        Next
End Sub

Answer 1

有三种可能性：

• 您的列数量（列idx 4）包含一个字符串，其中包含换行符。如果是这种情况，您可以在加入值之前Trim()加上值。
• 您的列数包含许多空格，或以换行符开头。如果是这种情况，您也可以使用Trim()进行修复，这次是在变量amount上加入值之前。
• 这是我还没有想到的其他事情：）。