asp：图表在更新面板下保持刷新/闪烁

Question

我目前使用asp：图表控件生成图表
该图表是一个真实的实时图表，每秒不断更新
这是我项目的前端代码

<asp:ScriptManager ID="ScriptManager1" runat="server"></asp:ScriptManager>
        <asp:Timer ID="Timer1" runat="server" Interval="1000" OnTick="Timer1_Tick"></asp:Timer>
        <asp:UpdatePanel ID="UpdatePanel1" runat="server">
<Triggers>
            <asp:AsyncPostBackTrigger ControlID="Timer1" EventName="tick" />
        </Triggers>
            <ContentTemplate>
                <div style="height:70%">
                    <asp:Chart ID="chart" runat="server" Width="1700px" Height="600px">
                        <Titles>
                            <asp:Title Text="Chart" Font="Times New Roman, 24pt, style=Bold" ForeColor="White" />
                        </Titles>
                        <Series>
                            <asp:Series ChartType="Area" Name="Level" XValueMember="Time" YValueMembers="Level" IsVisibleInLegend="true" IsValueShownAsLabel="true" YValuesPerPoint="2" Color="90, 39, 174, 96">
                            </asp:Series>
                            <asp:Series ChartType="Area" Name="Percentage" XValueMember="Time" YValueMembers="Percentage" IsVisibleInLegend="true" IsValueShownAsLabel="true" YValuesPerPoint="2" Color="90, 155, 89, 182">
                            </asp:Series>
                        </Series>
                        <ChartAreas>
                            <asp:ChartArea Name="ChartArea1" BackColor="White">
                                <AxisX LineColor="Gray" Interval = "1" Title="Time(hh:mm:ss)" TitleForeColor="White">
                                    <MajorGrid LineColor="Gray" />
                                    <LabelStyle ForeColor="white" />
                                </AxisX>
                                <AxisY LineColor="Gray" Interval = "5" Title="Levek/Percentage" TitleForeColor="White">
                                    <MajorGrid LineColor="Gray" />
                                    <LabelStyle ForeColor="white" />
                                </AxisY>
                                <Area3DStyle Enable3D="true" LightStyle="Realistic"></Area3DStyle>
                            </asp:ChartArea>
                        </ChartAreas>
                        <Legends>
                            <asp:Legend BackColor="Transparent" ForeColor="white">
                            </asp:Legend>
                        </Legends>
                    </asp:Chart>
                </div>
            </ContentTemplate>
        </asp:UpdatePanel>

这是我项目的后端代码

Protected Sub Timer1_Tick(ByVal sender As Object, ByVal e As EventArgs) Handles Timer1.Tick
    Dim dtTable As New Data.DataTable

    Dim strSQL As String = "SELECT level, percentage, time FROM Record ORDER BY date DESC, time DESC"
    If Not db_connSQL(strSQL, dtTable) Then
        Exit Sub
    End If
    If dtTable.Rows.Count > 0 Then
        chart.DataSource = dtTable
        chart.DataBind()
    End If
End Sub

我喜欢使用UpdatePanel和AsyncPostBackTrigger。
但图表仍然闪烁。
任何人都可以帮助我吗？