在 Windows 窗体应用程序 C# 中绘制图形

Question

Hello guys I need some help to draw the graphic in Windows Forms Application.

I downloaded Nevron Chart for .NET Community Edition from here:

https://www.nevron.com/products-dot-net-chart-free-control

And I drag one chart from tools in Windows Forms Application

So I make connection in the chart with MySql but I need to export the query in the chart.

My Code is:

private void chart1_Click(object sender, EventArgs e) {
    string MyConString3 = "SERVER=localhost;" + "DATABASE=hydrodb;" +
                "UID=root;" + "PASSWORD=;";
    MySqlConnection connection3 = new MySqlConnection(MyConString3);

    string command3 = "select year(Dat),month(Dat),min(vkolmin),avg(Vkolsre),Max(Vkolmax) from hydmes where station='"
        + comboBox1.SelectedItem.ToString() + "' and Dat between '"
        + comboBox2.SelectedItem.ToString() + "' and '" + comboBox3.SelectedItem.ToString()
        + "' group by year(dat),month(Dat)";
        MySqlDataAdapter da3 = new MySqlDataAdapter(command3, connection3);
        DataTable dt3 = new DataTable();
        da3.Fill(dt3);

        string s = "";
        foreach (DataRow row in dt3.Rows) {
            string rowz = string.Format("{0}, {1}, {2}, {3}, {4}", row.ItemArray[0], row.ItemArray[1], row.ItemArray[2],
            row.ItemArray[3], row.ItemArray[4]);
            s += "-" + rowz;
        }
        connection3.Close();
    }

I'm not sure if I need foreach ?

I need to export this query from

string command3 = "select year(Dat),month(Dat),min(vkolmin),avg(Vkolsre),Max(Vkolmax) from hydmes where station='"
    + comboBox1.SelectedItem.ToString() + "' and Dat between '"
    + comboBox2.SelectedItem.ToString() + "' and '" + comboBox3.SelectedItem.ToString()
    + "' group by year(dat),month(Dat)";`

In the chart ?

Some help with the code ?

Answer 1

If you wish to draw graphics in winform, why not use the zedgraph instead. They have got lots of sample codes for many varieties of charts as well..

Do checkout the following links :

1. Samples From Code project

2. The Official Site containing sample materials