DataGridView VB.net中的计算

我正在VB.net中构建一个销售点系统，并使用DataGridView显示我的数据。当我将“价格”列相加时，将显示总数，但如果我按下“总数”按钮，则数字将加倍，并且每次按下时，数字将继续加倍。此外，我想知道如何包括一个按钮，我可以输入收到的金额和需要给予的变化？我将感谢任何帮助，因为我是一个全新的VB

          Private Sub btnSandAndSoup_Click(sender As Object, e As EventArgs)                          
          Handles btnSandAndSoup.Click
    DataGridView1.ColumnCount = 4
    DataGridView1.Columns(0).Name = "Bar Code"
    DataGridView1.Columns(1).Name = "Type"
    DataGridView1.Columns(2).Name = "Name"
    DataGridView1.Columns(3).Name = "Price"

   Dim row As String() = New String() {"0037853", "Food", "Sandwhich Soup",
  "10"}
    DataGridView1.Rows.Add(row)

End Sub

  Private Sub btnChickenWings_Click(sender As Object, e As EventArgs
  Handles btnChickenWings.Click

    DataGridView1.ColumnCount = 4
    DataGridView1.Columns(0).Name = "Bar Code"
    DataGridView1.Columns(1).Name = "Type"
    DataGridView1.Columns(2).Name = "Name"
    DataGridView1.Columns(3).Name = "Price"

    Dim row As String() = New String() {"0037834", "Food", "Chicken Wings", "12"}
    DataGridView1.Rows.Add(row)


 End Sub
 Private Sub btnTotal_Click(ByVal sender As System.Object, ByVal e As   System.EventArgs) Handles btnTotal.Click
    Try
        'declaring variable as integer to store the value of the total rows    in the datagridview

        Dim max As Integer = DataGridView1.Rows.Count - 1
        Dim total As String = "Total ----------->"
        Dim tot As Integer = 0
        'getting the values of a specific rows


        For Each row As DataGridViewRow In DataGridView1.Rows
            'formula for adding the values in the rows
            tot += row.Cells(3).Value
        Next
        DataGridView1.Rows(max).Cells(3).Value += tot
        DataGridView1.Rows(max).Cells(2).Value = total
    Catch ex As Exception
        MsgBox(ex.Message)
    End Try
End Sub

---

有两种行类型-

DataRow

和

AlternatingDataRow

。仅当行是这两种类型之一时，才循环和总计

---

将总控件放在页脚模板中。在循环期间，它们不会被添加到总和中。

您正在迭代所有行：

在DataGridView1中将每行作为DataGridViewRow。行

和总计行是其中之一，因此其值也会被添加（并重新添加）