数据载入错误!对象不能从DBunll转换为其类型.错误号13#,三天了没搞定，请高手帮忙。

eiko_1985

数据载入错误!对象不能从DBunll转换为其类型.错误号13#

调试runningsun的值为OD


Public runningsum As Double
    Private Sub DataGrid2_ItemDataBound(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.DataGridItemEventArgs) Handles DataGrid2.ItemDataBound
        'Dim runningSum As Single
        If e.Item.ItemType = ListItemType.Item Or e.Item.ItemType = ListItemType.AlternatingItem Then

            runningsum += Convert.ToDouble(DataBinder.Eval(e.Item.DataItem, "jshj"))

        ElseIf e.Item.ItemType = ListItemType.Footer Then
'e.Item.Cells(3).Text = "<b>签复总金额：</b>   " + String.Format("{0:c}", runningsum)
End If

    End Sub  

eiko_1985

调试runningsun的值为OD,实际值为60

heatheat

你可以这样试下
假设字段strtmp is DBNull
你可以将strtmp写成strtmp.tostring(不用理会有没有显示提示)可以将DBNull转为""(空字符)