Question

我m trying to show gender percentage into a pie chart using count statement and placing it in dataset. I已经检索了数据，但我不知道如何在XY中绑定它，因为所有数据都在一个dataTable变量中。

所以我的程序流程，

用户从下拉列表中选择表名
用户生成报告
x和y的ddl填充了上面报告中显示的列
用户从ddl中选择具有列名的x和y值

对于数据库，它只有id，name和gender。

如果只是从DB读取值，那么我已经设法使用dataView（），但为此我真的不知道该怎么做。

P / S。 C＃和asp.net中的新功能。感谢所有帮助和高级TQVM。

第1部分代码 - 获取用户下拉列表并创建数据集

public void testGraph()
    {
        string ddlX = ddlTestGraphX.SelectedValue;
        string ddlY = ddlTestGraphY.SelectedValue;
        CodeDB db = new CodeDB();
        db.Open();

        //SET UP THE DATA TO PLOT
        string userInput = DDLTableName.SelectedValue;
        if (userInput == "tblparticipant")
        {
            DataSet dsX = db.getDataSet2(ddlX, userInput);
            DataTable dataX = dsX.Tables[0];
            DataSet dsY = db.getDataSetCount(ddlY, userInput);
            DataTable dataY = dsY.Tables[0];

            string trimmedUserInput = userInput.Remove(0, 3);
            try
            {
                if (rbPieChart.Checked == true)
                {
                    pieChart(trimmedUserInput, dataX, dataY);
                }

            }
            catch (Exception ex)
            {
                lblError.Visible = true;
                lblError.Text = "Check Your drop down list";
            }
        }
}

第二部分代码 - 显示饼图

public void pieChart(string recTrimmedUserInput, DataTable recDataX, DataTable recDataY)
    {
        //BIND THE DATA TO THE CHART
        Chart1.Series.Add(new Series());
        Title title = Chart1.Titles.Add("CHART " + recTrimmedUserInput.ToUpper());
        Chart1.Series[0].Points.DataBindXY(recDataX.AsDataView(), recDataY.AsDataView());

        //SET THE CHART TYPE TO BE PIE
        Chart1.Series[0].ChartType = System.Web.UI.DataVisualization.Charting.SeriesChartType.Pie;
        //Chart1.Series[0].Label = "#PERCENT{P2}";
        Chart1.Series[0]["PieLabelStyle"] = "Outside";
        Chart1.Series[0]["PieStartAngle"] = "-90";

        //SET THE COLOR PALETTE FOR THE CHART TO BE A PRESET OF NONE 
        //DEFINE OUR OWN COLOR PALETTE FOR THE CHART 
        Chart1.Palette = System.Web.UI.DataVisualization.Charting.ChartColorPalette.None;
        //Chart1.PaletteCustomColors = new Color[] { Color.Blue, Color.Red };

        //Chart1.Series[0].Label = "#VALX , #VALY";
        Chart1.Series[0].Label = "#PERCENT{P2}";

        //SET THE IMAGE OUTPUT TYPE TO BE JPEG
        Chart1.ImageType = System.Web.UI.DataVisualization.Charting.ChartImageType.Jpeg;

        //ADD A PLACE HOLDER CHART AREA TO THE CHART
        //SET THE CHART AREA TO BE 3D
        Chart1.ChartAreas.Add(new ChartArea());
        Chart1.ChartAreas[0].Area3DStyle.Enable3D = true;

        //ADD A PLACE HOLDER LEGEND TO THE CHART
        //DISABLE THE LEGEND
        Chart1.Legends.Add(new Legend());
        Chart1.Series[0].LegendText = "#VALX";
        Chart1.Legends[0].Enabled = true;
    }

第3部分代码 - 获取数据集

public DataSet getDataSetCount(string receivedDDL, string receivedUserInput)
    {
        string query = "Select " + receivedDDL +", count(id) as count From "+ receivedUserInput+" Group by "+ receivedDDL;
        if (con.State.ToString() == "Open")
        {
            SqlDataAdapter ad = new SqlDataAdapter(query, con);
            DataSet ds = new DataSet("Table");

            ad.Fill(ds);

            return ds;
        }
        else
        {
            return null;
        }
    }

饼图 - 如何根据Sql Count语句

0 个答案: