Question

 For i As Integer = 0 To DataGridView1.RowCount - 1
        fundwith += DataGridView1.Rows(i).Cells("Withdrawal").Value
        trans += DataGridView1.Rows(i).Cells("Trans").Value
        meal += DataGridView1.Rows(i).Cells("Meal").Value
        rep += DataGridView1.Rows(i).Cells("Rep").Value
        meet += DataGridView1.Rows(i).Cells("Meet").Value
        misc += DataGridView1.Rows(i).Cells("Misc").Value
        oth += DataGridView1.Rows(i).Cells("Others").Value
        inc += DataGridView1.Rows(i).Cells("Inc").Value
        dec += DataGridView1.Rows(i).Cells("Dec").Value
    Next

我收到此错误“运算符'+'未定义为类型'Double'并键入'DBNull'。”

如果这两列不可见，我如何得到Column Inc和Column Dec的总数？

Answer 1

您可以改为在数据源上运行计算。如果您的基础源是数据表，则可以枚举数据行或使用table.compute。

Answer 2

访问基础DataRow ...

Dim drw as DataRow = DirectCast(DataGridView1.Rows(i).DataBoundItem, DataRowView).Row

然后

fundwith += CDec(drw("Withdrawal")) 'replace CDec with whatever type conversion you need

如果datagridview中的列不可见，则计算总值

2 个答案: