在 windowsForms 下进行ZedGraph图表开发

 public Form1()
        {
            InitializeComponent();
            CreateGraph(zedGraphControl2);// 1. 调用CreateGraph 方法

        }

        public void CreateGraph(ZedGraphControl zgc)

        {
            GraphPane myPane = zgc.GraphPane;//2.得到画板
            myPane.Title.Text = "曲线图";
            myPane.XAxis.Title.Text = "时间（S）";
            myPane.YAxis.Title.Text = "电压（mV）";

 

            PointPairList list1 = new PointPairList();//3.添加一条线

            string sql = "select  col1,col2 from testztq";
            string sqlconn = "Server=(local);Database=myztq;User ID=sa;Password=123; ";
            using (SqlConnection conn = new SqlConnection(sqlconn))
            {
                if (conn.State == ConnectionState.Closed)
                {
                    conn.Open();
                }

                SqlDataAdapter da = new SqlDataAdapter(sql, conn);
                DataSet ds = new DataSet();
                da.Fill(ds);
                DataTable dt = ds.Tables[0];
                if (dt.Rows.Count > 0)
                {
                    myPane.XAxis.Scale.Max = dt.Rows.Count;
                    foreach (DataRow dr in dt.Rows)
                    {
                        list1.Add(double.Parse(dr["col1"].ToString()), double.Parse(dr["col2"].ToString()));  //4.给线加上点
                    }
                }

                conn.Close();

            }
            LineItem myCurve = myPane.AddCurve("", list1, Color.Red, SymbolType.XCross); //5.第一条曲线绘制

            zgc.AxisChange();                 //6.重新绘制轴范围

            zedGraphControl2.Invalidate();  //7.更新图标

        }
    }