Question

我正在尝试从datagridview创建柱形图，该视图从数据库下载DataSet。是datagridview2。我在公共类中编写了void loaddata（）。至于Chart是演唱会，我是由chart（）public void类编写的。我要显示：

XvalueMember : ORDER_NUMBER
YvalueMember: TOTAL_TIME

有我的代码：

GenerateCharts.cs

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using MySql.Data.MySqlClient;
using System.Configuration;
using System.Windows.Forms.DataVisualization.Charting;
using iTextSharp.text;
using iTextSharp.text.pdf;
using System.IO;
using System.Text.RegularExpressions;

namespace ControlBase
{
    public partial class GenerateCharts : Form
    {
        public GenerateCharts()
        {
            InitializeComponent();
        }
        public void loaddata()
        {
            try
            {
                MySqlConnection connection = new MySqlConnection("datasource=localhost;port=3306;username=root;password=");
                MySqlDataAdapter adapter2 = new MySqlDataAdapter("SELECT w.FNAME, w.LNAME, z.ORDER_DESC AS 'ORDER DESCRIPTION', o.ORDER_NUMBER AS 'ORDER NUMBER', SEC_TO_TIME(SUM(TIME_TO_SEC(s.BEGIN_DATE) - TIME_TO_SEC(s.END_DATE))) AS 'TOTAL TIME OF ORDER' FROM projekt1.status_order s INNER JOIN projekt1.workers p ON s.ID_WORKER = w.ID_WORKER INNER JOIN projekt1.orders z ON s.ID_ORDER = o.ID_ORDER WHERE p.ID_WORKER ='" + int.Parse(textBox1.Text)+ "' AND BEGIN_DATE >= '" + dateTimePicker1.Value.ToString("yyyy-MM-dd") + "' AND END_DATE <= '" + dateTimePicker2.Value.ToString("yyyy-MM-dd") + "' GROUP BY s.ID_ORDER;", connection);
                connection.Open();

                DataSet ds2 = new DataSet();
                adapter2.Fill(ds2, "status_order");
                dataGridView2.DataSource = ds2.Tables["status_order"];
                connection.Close();
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }
        }

        public void chart()
        {

            MySqlConnection connection = new MySqlConnection();
            connection.ConnectionString = "datasource=localhost;port=3306;username=root;password=";
            connection.Open();

            MySqlCommand cmd = connection.CreateCommand();
            cmd.CommandText = "SELECT w.FNAME, w.LNAME, z.ORDER_DESC AS 'ORDER DESCRIPTION', o.ORDER_NUMBER AS 'ORDER NUMBER', SEC_TO_TIME(SUM(TIME_TO_SEC(s.BEGIN_DATE) - TIME_TO_SEC(s.END_DATE))) AS 'TOTAL_TIME' FROM projekt1.status_order s INNER JOIN projekt1.workers p ON s.ID_WORKER = w.ID_WORKER INNER JOIN projekt1.orders z ON s.ID_ORDER = o.ID_ORDER WHERE p.ID_WORKER ='" + int.Parse(textBox1.Text)+ "' AND BEGIN_DATE >= '" + dateTimePicker1.Value.ToString("yyyy-MM-dd") + "' AND END_DATE <= '" + dateTimePicker2.Value.ToString("yyyy-MM-dd") + "' GROUP BY s.ID_ORDER;";

            MySqlDataReader reader;

            reader = cmd.ExecuteReader();
            while (reader.Read())
            {
                chart1.Series[0].Points.AddXY(reader.GetString("ORDER_NUMBER"), reader.GetDateTime("TOTAL_TIME"));
            }

        }
        private void button1_Click(object sender, EventArgs e)
        {
            chart1.Series.Clear();
            chart();
            loaddata();

        }
    }
}

启动此应用并尝试生成列后，我出现错误：

System.ArgumentOutOfRangeException: "The index was out of range. It must have a non-negative value and less than the size of the collection. Parameter name: index "

我也尝试过从datagridview2获取数据，但是它没有用。有人可以解释如何更改该代码吗？寻求帮助。

Answer 1

您调用chart1.Series.Clear();，然后在chart()方法中尝试索引到集合：chart1.Series[0]。您需要先创建一个新的Series并添加它，然后才能对其进行索引。

C＃从数据库的datagridview创建图表

1 个答案: