Dim dt As DataTable = DataTables("登录日志")Dim dr As DataRow = dt.find(("用户 = '" & _UserName & "' and 退出时间 is null"))If dt.新增行或者未保存行 Then If dr IsNot Nothing Then dr("退出时间")= Date.Now() dt.save() End IfEnd If
请指点代码,谢谢!If dt.代码? Then