ASP.NET Pie chart only displaying YValueMembers

问题

I am trying to create a chart to display the percentage of checked and unchecked answer booklets.But the pie chart is only showing the unchecked value which is the YValueMember. How to resolve this?

 protected void DropDown_Subjects_SelectedIndexChanged(object sender, EventArgs e)
{
    Chart4.Visible = true;
    SqlConnection connection = new SqlConnection(ConfigurationManager.ConnectionStrings["Con"].ConnectionString);
    SqlCommand cmd = new SqlCommand("select checked_percent, unchecked_percent From(select COUNT(*) * 100.0 / (select count(*)from[newexam2017].[dbo].[newexam2017] where sub_code = '" + DropDown_Subjects.SelectedValue + "') as checked_percent from[newexam2017].[dbo].[newexam2017]  where CheckBy is not null and sub_code = '" + DropDown_Subjects.SelectedValue + "' )checked,(select COUNT(*) * 100.0 / (select count(*)from[newexam2017].[dbo].[newexam2017] where sub_code = '" + DropDown_Subjects.SelectedValue + "')as unchecked_percent from[newexam2017].[dbo].[newexam2017]  where CheckBy is  null and sub_code = '" + DropDown_Subjects.SelectedValue + "')unchecked", connection);
    connection.Open();


    SqlDataAdapter da = new SqlDataAdapter(cmd);
    DataSet ds = new DataSet();
    da.Fill(ds);

    DataTable ChartData = ds.Tables[0];
    Chart4.DataSource = ChartData;

    Chart4.Series[0].Points.DataBind(ChartData.DefaultView, "checked_percent", "unchecked_percent", "");

    for (int i = 0; i < Chart4.Series[0].Points.Count; i++)
    Chart4.Series[0].Points[i].Label = string.Format("{0:0.00}%", ChartData.Rows[i]["checked_percent"], "{0:0.00}%", ChartData.Rows[i]["unchecked_percent"]);


    connection.Close();
   }

asp code:

        <asp:Chart ID="Chart4" runat="server"  BackColor="DarkSlateBlue" BackGradientStyle="LeftRight"  
        BorderlineWidth="0" Height="440px" Palette="SeaGreen" PaletteCustomColors="24, 0, 0"  
        Width="560px" BorderlineColor="128, 128, 255" OnLoad="Chart4_Load">

             <Titles>
            <asp:Title Name="DefaultTitle" Font="Trebuchet MS, 15pt, style=Bold"
                  Text = "Overall Scoring Progress" />
      </Titles>
    <%--  <Legends>
            <asp:Legend Name="DefaultLegend" Enabled="True" Docking="Top" />
      </Legends>--%>

            <Series>
                <asp:Series Name="Series1"  IsValueShownAsLabel="true"  YValuesPerPoint="10"  ChartType="Pie"></asp:Series>
            </Series>
            <ChartAreas>
                <asp:ChartArea Name="ChartArea4" >

</asp:ChartArea>
            </ChartAreas>
        </asp:Chart>

What I want:

What I get :

回答1:

In a pie chart, both, checked_percent and unchecked_percent, must be Y-values. Like this:

 protected void Chart4_Load(object sender, EventArgs e)
 {
    Chart4.Series[0].Points.Add(new DataPoint(0, (double)ChartData.Rows[0]["unchecked_percent"]));
    Chart4.Series[0].Points.Add(new DataPoint(1, (double)ChartData.Rows[0]["checked_percent"]));
 }

EDIT: Including custom labels:

protected void Chart4_Load(object sender, EventArgs e)
{
    DataPoint dp = new DataPoint(0, (double)ChartData.Rows[0]["unchecked_percent"]);
    dp.Label = string.Format("unchecked\n{0:0.00}%", ChartData.Rows[0]["unchecked_percent"]);
    Chart4.Series[0].Points.Add(dp);

    dp = new DataPoint(1, (double)ChartData.Rows[0]["checked_percent"]);
    dp.Label = string.Format("checked\n{0:0.00}%", ChartData.Rows[0]["checked_percent"]);
    Chart4.Series[0].Points.Add(dp);
}

来源：https://stackoverflow.com/questions/45078271/asp-net-pie-chart-only-displaying-yvaluemembers

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