ZEDGRAPH画图心得

 OleDbConnection odcConnection = new OleDbConnection(MyConnectionString); //打开连接 C#操作Access之按列读取mdb   
            odcConnection.Open();    
            OleDbCommand odCommandValue = odcConnection.CreateCommand();//value
            OleDbCommand odCommandYear = odcConnection.CreateCommand();//year

            odCommandValue.CommandText = "select 全年平均 from 洱海各月出流流量"; //读取全年平均项，建立读取 C#操作Access之按列读取mdb   
            odCommandYear.CommandText = "select 年 from 洱海各月出流流量"; //读取year

            OleDbDataReader odrReaderValue = odCommandValue.ExecuteReader();//建立SQL查询value
            OleDbDataReader odrReaderYear = odCommandYear.ExecuteReader();//建立SQL查询year

            //ArrayList ArrValue = new ArrayList();//定义动态数组ArrValue
            //ArrayList ArrYear = new ArrayList();//定义动态数组ArrYear

            //double []Yearavrg;//数组定义
            //Yearavrg = new double[100];//初始化大小，分配内存
            //double []Year;//数组定义
            //Year = new double[100];

            double[] ArrValue;//数组定义
            ArrValue = new double[100];//初始化大小，分配内存
            double[] ArrYear;//数组定义
            ArrYear = new double[100];
            int im = 0, jm = 0;
            while (odrReaderValue.Read())
            {
               //ArrValue.Add(odrReaderValue["全年平均"].ToString());//读取列的每一个
                ArrValue[im] = Convert.ToDouble(odrReaderValue["全年平均"]);
                im++;
            }
            while (odrReaderYear.Read())
            {
                //ArrYear.Add(odrReaderYear["年"].ToString());//读取列的每一个
                ArrYear[jm] = Convert.ToDouble(odrReaderYear["年"]);
                jm++;
            }

            odrReaderValue.Close();
            odrReaderYear.Close();
            odcConnection.Close();
            //test
            //int leng = ArrValue.Count;//计算数组长度
            int leng = ArrValue.Length;

           // MessageBox.Show(leng.ToString());//test
            GraphPane MyPane=zedGraphControl1.GraphPane;
            MyPane.Title.Text = "洱海年平均出流流量";
            MyPane.XAxis.Title.Text = "年份";
            MyPane.YAxis.Title.Text = "流量（立方米每秒）";

            //
            PointPairList pplist = new PointPairList();//显示点数组
            //test-OK
            foreach (double a in ArrValue)
            {


                textBox1.Text += a;
                //pplist.Add(0,b);


            }

            //test-OK
            //foreach (string a in ArrYear)
            //foreach (string a in ArrValue)
            //{
            //    //MessageBox.Show(a);
            //    double b = double.Parse(a);//类型转换
            //    textBox1.Text += b;//test
            //}

            //foreach (string a in ArrValue)
            //{
            //    //MessageBox.Show(a);
            //    int i = 0;
            //    Yearavrg[i] = double.Parse(a);//类型转换
            //    i++;
                
            //}

            //foreach (string b in ArrYear)
            //{
            //    //MessageBox.Show(a);
            //    int i = 0;
            //    Year[i] = double.Parse(b);//类型转换
            //    i++;
            //    textBox1.Text+=Year[i].ToString();

            //}


            for (int i = 0; i < leng; i++)
            {

                pplist.Add(ArrYear[i], ArrValue[i]);//xaile是年，yaile是年平均流量值
            }


            LineItem myCurve = MyPane.AddCurve("流量",pplist,Color.Red,SymbolType.Diamond);//标注样式

            myCurve.Symbol.Fill = new Fill(Color.White);//背景填充白色
            MyPane.XAxis.MajorGrid.IsVisible = true;//显示X网格
            MyPane.YAxis.MajorGrid.IsZeroLine = true;//Y坐标不显示0坐标线

            // Align the Y axis labels so they are flush to the axis
            MyPane.YAxis.Scale.Align = AlignP.Inside;
           
            //坐标范围划定
            MyPane.YAxis.Scale.Min = -20;
            MyPane.YAxis.Scale.Max = 70;

            MyPane.XAxis.Scale.Min = 1950;
            MyPane.XAxis.Scale.Max = 2016;

            MyPane.Chart.Fill = new Fill(Color.White, Color.LightGray, 45.0f);


            // Add a text box with instructions
            TextObj text = new TextObj(
                "左键拖拽放大
鼠标中键滚放缩
右键菜单",
                0.05f, 0.95f, CoordType.ChartFraction, AlignH.Left, AlignV.Bottom);
            text.FontSpec.StringAlignment = StringAlignment.Near;
            MyPane.GraphObjList.Add(text);

            zedGraphControl1.IsShowHScrollBar = true;
            zedGraphControl1.IsShowVScrollBar = true;
            zedGraphControl1.IsAutoScrollRange = true;

            zedGraphControl1.IsShowPointValues = true;
            zedGraphControl1.PointValueEvent += new ZedGraphControl.PointValueHandler(MyPointValueHandler);
            // OPTIONAL: Add a custom context menu item
           // zedGraphControl1.ContextMenuBuilder += new ZedGraphControl.ContextMenuBuilderEventHandler(MyContextMenuBuilder);

            // OPTIONAL: Handle the Zoom Event
           // zedGraphControl1.ZoomEvent += new ZedGraphControl.ZoomEventHandler(MyZoomEvent);

            // Tell ZedGraph to calculate the axis ranges
            // Note that you MUST call this after enabling IsAutoScrollRange, since AxisChange() sets
            // up the proper scrolling parameters
            zedGraphControl1.AxisChange();
            // Make sure the Graph gets redrawn
            zedGraphControl1.Invalidate();
        }
        /// <summary>
        /// Display customized tooltips when the mouse hovers over a point
        /// </summary>
        private string MyPointValueHandler(ZedGraphControl control, GraphPane pane,CurveItem curve, int iPt)
        {
            // Get the PointPair that is under the mouse
            PointPair pt = curve[iPt];

           // return curve.Label.Text + " is " + pt.Y.ToString("f2") + " m3/s at " + pt.X.ToString("f1") + " 年";
            //return pt.X.ToString("f1") + "年"+curve.Label.Text + "是" + pt.Y.ToString("f2") + " wm3/s";
            return pt.X.ToString() + "年" + curve.Label.Text + "是" + pt.Y.ToString("f2") + " wm3/s";//OKZWJ
        }

        /// <summary>
        /// Customize the context menu by adding a new item to the end of the menu
        /// </summary>
        private void MyContextMenuBuilder(ZedGraphControl control, ContextMenuStrip menuStrip,
                        Point mousePt, ZedGraphControl.ContextMenuObjectState objState)
        {
            ToolStripMenuItem item = new ToolStripMenuItem();
            item.Name = "add-beta";
            item.Tag = "add-beta";
            item.Text = "Add a new Beta Point";
            item.Click += new System.EventHandler(AddBetaPoint);

            menuStrip.Items.Add(item);
        }

        /// <summary>
        /// Handle the "Add New Beta Point" context menu item.  This finds the curve with
        /// the CurveItem.Label = "Beta", and adds a new point to it.
        /// </summary>
        private void AddBetaPoint(object sender, EventArgs args)
        {
            // Get a reference to the "Beta" curve IPointListEdit
            IPointListEdit ip = zedGraphControl1.GraphPane.CurveList["Beta"].Points as IPointListEdit;
            if (ip != null)
            {
                double x = ip.Count * 5.0;
                double y = Math.Sin(ip.Count * Math.PI / 15.0) * 16.0 * 13.5;
                ip.Add(x, y);
                zedGraphControl1.AxisChange();
                zedGraphControl1.Refresh();
            }
        }

        // Respond to a Zoom Event
        private void MyZoomEvent(ZedGraphControl control, ZoomState oldState,ZoomState newState)
        {
            // Here we get notification everytime the user zooms
        }




    }

调试蛮辛苦的，尝试了很多次，各种改变，最后终于可以了！！！