如何在DataGridView中获取列的总数

Question

Every time there is a blank cell the result is 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

Like Mat said but I like the .net way better. They say TryParse is faster which could make a difference if you have an awful lot of rows.

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

If the cell contains no value, an InvalidCastException is thrown and the Try -block is left.

So you'll need to check the cell for a numeric value before calculating. Furthermore you can shorten your code and omit the 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()