如何在DataGridView中獲取列的總數

Question

每次有一個空白單元格時結果為0？

Dim tot As Decimal
Try
    If BREAKDOWNLIST.RowCount <> 1 Then
        For Each row As DataGridViewRow In BREAKDOWNLIST.Rows
            If IsNothing(Me.BREAKDOWNLIST.CurrentRow.Cells(5).Value) Then

            Else
                If BREAKDOWNLIST.RowCount = 1 Then
                    tot = Val(row.Cells(5).Value)
                ElseIf BREAKDOWNLIST.RowCount > 1 Then
                    tot += Val(row.Cells(5).Value)
                End If
            End If
        Next
    ElseIf BREAKDOWNLIST.RowCount = 1 Then
    End If

    TOTAL.Text = tot
Catch
End Try

Answer 1

就像Mat所說的一樣，但我更喜歡.net方式。 他們說TryParse更快，如果您有很多行，可能會有所作為。

Dim decValue As Decimal
Dim tot As Decimal
For Each row As DataGridViewRow In BREAKDOWNLIST.Rows
    If Decimal.TryParse(row.Cells(5).Value, decValue) Then
        tot += decValue
    End If
Next

Answer 2

如果單元格不包含任何值，則拋出InvalidCastException並保留Try -block。

因此，您需要在計算之前檢查單元格中的數字值。 此外，您可以縮短代碼並省略Try/Catch -block：

Dim tot As Decimal

For Each row As DataGridViewRow In BREAKDOWNLIST.Rows
    If IsNumeric(row.Cells(5).Value) Then
        tot += Val(row.Cells(5).Value)
    End If
Next

TOTAL.Text = tot.ToString()