主题：[求助]表事件中平均值计算

呃，直接相加相除。

If e.DataCol.Name Like "硬度*" Then
    Dim count As Integer = 0
    Dim sum As Double = 0
    For Each dc As DataCol In e.DataTable.datacols
        If dc.name Like "硬度*" AndAlso e.DataRow.isnull(dc.name) = False Then
            count += 1
            sum += e.DataRow(dc.name)
        End If
    Next
    If count > 0 Then
        e.DataRow("平均硬度") = sum / count
    Else
        e.DataRow("平均硬度") = Nothing
    End If
End If