1 OleDbConnection odcConnection = new OleDbConnection(MyConnectionString); //打开连接 C#操作Access之按列读取mdb 2 odcConnection.Open(); 3 OleDbCommand odCommandValue = odcConnection.CreateCommand();//value 4 OleDbCommand odCommandYear = odcConnection.CreateCommand();//year 5 6 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 7 odCommandYear.CommandText = "select 年 from 洱海各月出流流量"; //读取year 8 9 OleDbDataReader odrReaderValue = odCommandValue.ExecuteReader();//建立SQL查询value 10 OleDbDataReader odrReaderYear = odCommandYear.ExecuteReader();//建立SQL查询year 11 12 //ArrayList ArrValue = new ArrayList();//定义动态数组ArrValue 13 //ArrayList ArrYear = new ArrayList();//定义动态数组ArrYear 14 15 //double []Yearavrg;//数组定义 16 //Yearavrg = new double[100];//初始化大小，分配内存 17 //double []Year;//数组定义 18 //Year = new double[100]; 19 20 double[] ArrValue;//数组定义 21 ArrValue = new double[100];//初始化大小，分配内存 22 double[] ArrYear;//数组定义 23 ArrYear = new double[100]; 24 int im = 0, jm = 0; 25 while (odrReaderValue.Read()) 26 { 27 //ArrValue.Add(odrReaderValue["全年平均"].ToString());//读取列的每一个 28 ArrValue[im] = Convert.ToDouble(odrReaderValue["全年平均"]); 29 im++; 30 } 31 while (odrReaderYear.Read()) 32 { 33 //ArrYear.Add(odrReaderYear["年"].ToString());//读取列的每一个 34 ArrYear[jm] = Convert.ToDouble(odrReaderYear["年"]); 35 jm++; 36 } 37 38 odrReaderValue.Close(); 39 odrReaderYear.Close(); 40 odcConnection.Close(); 41 //test 42 //int leng = ArrValue.Count;//计算数组长度 43 int leng = ArrValue.Length; 44 45 // MessageBox.Show(leng.ToString());//test 46 GraphPane MyPane=zedGraphControl1.GraphPane; 47 MyPane.Title.Text = "洱海年平均出流流量"; 48 MyPane.XAxis.Title.Text = "年份"; 49 MyPane.YAxis.Title.Text = "流量（立方米每秒）"; 50 51 // 52 PointPairList pplist = new PointPairList();//显示点数组 53 //test-OK 54 foreach (double a in ArrValue) 55 { 56 57 58 textBox1.Text += a; 59 //pplist.Add(0,b); 60 61 62 } 63 64 //test-OK 65 //foreach (string a in ArrYear) 66 //foreach (string a in ArrValue) 67 //{ 68 // //MessageBox.Show(a); 69 // double b = double.Parse(a);//类型转换 70 // textBox1.Text += b;//test 71 //} 72 73 //foreach (string a in ArrValue) 74 //{ 75 // //MessageBox.Show(a); 76 // int i = 0; 77 // Yearavrg[i] = double.Parse(a);//类型转换 78 // i++; 79 80 //} 81 82 //foreach (string b in ArrYear) 83 //{ 84 // //MessageBox.Show(a); 85 // int i = 0; 86 // Year[i] = double.Parse(b);//类型转换 87 // i++; 88 // textBox1.Text+=Year[i].ToString(); 89 90 //} 91 92 93 for (int i = 0; i < leng; i++) 94 { 95 96 pplist.Add(ArrYear[i], ArrValue[i]);//xaile是年，yaile是年平均流量值 97 } 98 99 100 LineItem myCurve = MyPane.AddCurve("流量",pplist,Color.Red,SymbolType.Diamond);//标注样式 101 102 myCurve.Symbol.Fill = new Fill(Color.White);//背景填充白色 103 MyPane.XAxis.MajorGrid.IsVisible = true;//显示X网格 104 MyPane.YAxis.MajorGrid.IsZeroLine = true;//Y坐标不显示0坐标线 105 106 // Align the Y axis labels so they are flush to the axis 107 MyPane.YAxis.Scale.Align = AlignP.Inside; 108 109 //坐标范围划定 110 MyPane.YAxis.Scale.Min = -20; 111 MyPane.YAxis.Scale.Max = 70; 112 113 MyPane.XAxis.Scale.Min = 1950; 114 MyPane.XAxis.Scale.Max = 2016; 115 116 MyPane.Chart.Fill = new Fill(Color.White, Color.LightGray, 45.0f); 117 118 119 // Add a text box with instructions 120 TextObj text = new TextObj( 121 "左键拖拽放大 鼠标中键滚放缩 右键菜单", 122 0.05f, 0.95f, CoordType.ChartFraction, AlignH.Left, AlignV.Bottom); 123 text.FontSpec.StringAlignment = StringAlignment.Near; 124 MyPane.GraphObjList.Add(text); 125 126 zedGraphControl1.IsShowHScrollBar = true; 127 zedGraphControl1.IsShowVScrollBar = true; 128 zedGraphControl1.IsAutoScrollRange = true; 129 130 zedGraphControl1.IsShowPointValues = true; 131 zedGraphControl1.PointValueEvent += new ZedGraphControl.PointValueHandler(MyPointValueHandler); 132 // OPTIONAL: Add a custom context menu item 133 // zedGraphControl1.ContextMenuBuilder += new ZedGraphControl.ContextMenuBuilderEventHandler(MyContextMenuBuilder); 134 135 // OPTIONAL: Handle the Zoom Event 136 // zedGraphControl1.ZoomEvent += new ZedGraphControl.ZoomEventHandler(MyZoomEvent); 137 138 // Tell ZedGraph to calculate the axis ranges 139 // Note that you MUST call this after enabling IsAutoScrollRange, since AxisChange() sets 140 // up the proper scrolling parameters 141 zedGraphControl1.AxisChange(); 142 // Make sure the Graph gets redrawn 143 zedGraphControl1.Invalidate(); 144 } 145 /// <summary> 146 /// Display customized tooltips when the mouse hovers over a point 147 /// </summary> 148 private string MyPointValueHandler(ZedGraphControl control, GraphPane pane,CurveItem curve, int iPt) 149 { 150 // Get the PointPair that is under the mouse 151 PointPair pt = curve[iPt]; 152 153 // return curve.Label.Text + " is " + pt.Y.ToString("f2") + " m3/s at " + pt.X.ToString("f1") + " 年"; 154 //return pt.X.ToString("f1") + "年"+curve.Label.Text + "是" + pt.Y.ToString("f2") + " wm3/s"; 155 return pt.X.ToString() + "年" + curve.Label.Text + "是" + pt.Y.ToString("f2") + " wm3/s";//OKZWJ 156 } 157 158 /// <summary> 159 /// Customize the context menu by adding a new item to the end of the menu 160 /// </summary> 161 private void MyContextMenuBuilder(ZedGraphControl control, ContextMenuStrip menuStrip, 162 Point mousePt, ZedGraphControl.ContextMenuObjectState objState) 163 { 164 ToolStripMenuItem item = new ToolStripMenuItem(); 165 item.Name = "add-beta"; 166 item.Tag = "add-beta"; 167 item.Text = "Add a new Beta Point"; 168 item.Click += new System.EventHandler(AddBetaPoint); 169 170 menuStrip.Items.Add(item); 171 } 172 173 /// <summary> 174 /// Handle the "Add New Beta Point" context menu item. This finds the curve with 175 /// the CurveItem.Label = "Beta", and adds a new point to it. 176 /// </summary> 177 private void AddBetaPoint(object sender, EventArgs args) 178 { 179 // Get a reference to the "Beta" curve IPointListEdit 180 IPointListEdit ip = zedGraphControl1.GraphPane.CurveList["Beta"].Points as IPointListEdit; 181 if (ip != null) 182 { 183 double x = ip.Count * 5.0; 184 double y = Math.Sin(ip.Count * Math.PI / 15.0) * 16.0 * 13.5; 185 ip.Add(x, y); 186 zedGraphControl1.AxisChange(); 187 zedGraphControl1.Refresh(); 188 } 189 } 190 191 // Respond to a Zoom Event 192 private void MyZoomEvent(ZedGraphControl control, ZoomState oldState,ZoomState newState) 193 { 194 // Here we get notification everytime the user zooms 195 } 196 197 198 199 200 }
调试蛮辛苦的，尝试了很多次，各种改变，最后终于可以了！！！