c# - 在图表控件中添加一个按钮

Question

我想要一个放置在图表内的按钮，以将图表导出到 Excel 文件。我搞砸了 MapAreas，但我不知道如何将地图区域设置为图像或控件。有没有不同的方法来完成这个功能？该按钮需要以某种方式附加到图表上。

Answer 1

You need to understand that an ASP.NET chart control is just an image and when you create MapAreas you basically specify clickable spots on this image, therefore (as far as I know) a MapArea cannot have a custom background image or a custom control.

Instead use a custom legend:

Source:

    <asp:Chart ID="Chart1" runat="server" OnClick="Chart1_Click1">
        <Series>
            <asp:Series YValuesPerPoint="2" IsVisibleInLegend="false" Name="Series1" ChartType="Column">
                <Points>
                    <asp:DataPoint AxisLabel="Product 1" YValues="100" />
                    <asp:DataPoint AxisLabel="Product 2" YValues="300" />
                </Points>
            </asp:Series>
        </Series>
        <ChartAreas>
            <asp:ChartArea Name="ChartArea1">
            </asp:ChartArea>
        </ChartAreas>
        <Legends>
            <asp:Legend Title="Export options:">
                <CustomItems>
                    <asp:LegendItem
                    Name="Export To Excel" 
                    PostBackValue="Export From Legend"  
                    Color="Green">
                    </asp:LegendItem>
                </CustomItems>
            </asp:Legend>
        </Legends>
    </asp:Chart>

Code behind:

protected void Chart1_Click1(object sender, ImageMapEventArgs e)
{
    if (e.PostBackValue == "Export From Legend")
    {
       //Handle the exporting to Excel
    }
}

End result: