Create a dynamic chart from mysql database

Question

0.00/5 (No votes)

See more:

I want to create a dynamic chart from a mysql database table, from selected columns.
I can graph 2 specific columns in a chart, but the problem I am having is when I try to change chart type.
I am getting this error:

a chart element with name series1 could not be found in the seriescollection

What I have tried:

public void GetData()
    {
        String constr = System.Configuration.ConfigurationManager.ConnectionStrings["web"].ToString();
        //MySqlConnection con = new MySqlConnection(constr);        
        using (MySqlConnection con = new MySqlConnection(constr))
        {
            MySqlCommand cmd = new MySqlCommand("select " + col1.Text + ", " + col2.Text + " from avance_actividad", con);
                Series series = Chart1.Series["Series1"];
            con.Open();
            MySqlDataReader rdr = cmd.ExecuteReader();
            while (rdr.Read())
            {
                series.Points.AddXY(rdr[col1.Text].ToString(), rdr[col2.Text]);
                //this.Chart1.Series["Series1"].Points.AddXY(rdr.GetString(col1.Text), rdr.GetInt32(col2.Text));
            }
        }
    }

    protected void graph_SelectedIndexChanged(object sender, EventArgs e)
    {
        GetData();
        this.Chart1.Series["Series1"].ChartType = (SeriesChartType)Enum.Parse(
                typeof(SeriesChartType), graph.SelectedValue);
    }

Posted 21-Dec-17 2:59am

Member 10850253

Updated 21-Dec-17 3:04am

Add a Solution

1 solution

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Member 10850253 · Answer 1 · 2017-12-21T03:04:00

I just fixed it.

protected void graph_SelectedIndexChanged1(object sender, EventArgs e)
    {
        Chart1.Series.Clear();
        Chart1.Series.Add("Series1");
        GetData();
        this.Chart1.Series["Series1"].ChartType =
            (SeriesChartType)Enum.Parse(typeof(SeriesChartType),
                       graph.SelectedValue); 
    }