C# Detailed explanation of using zedgraph to draw histogram

1. Download the zedGraph control: http://download.csdn.net/detail/allisnew/322251

2. Add a reference to zedGraph.dll

3. At the end of the toolbox Add a regular control on the interface--Browse--Select zedgraph.dll

4. Write the following initialization code (you can also drag a control directly):

private ZedGraphControl zedGraphControl1 = new ZedGraphControl();

 this.zedGraphControl1.Location = new System.Drawing.Point(36, 48);
            this.zedGraphControl1.Name = "zedGraphControl1";
            this.zedGraphControl1.ScrollGrace = 0;
            this.zedGraphControl1.ScrollMaxX = 0;
            this.zedGraphControl1.ScrollMaxY = 0;
            this.zedGraphControl1.ScrollMaxY2 = 0;
            this.zedGraphControl1.ScrollMinX = 0;
            this.zedGraphControl1.ScrollMinY = 0;
            this.zedGraphControl1.ScrollMinY2 = 0;
            this.zedGraphControl1.Size = new System.Drawing.Size(427, 247);
            this.zedGraphControl1.TabIndex = 0;
            this.Controls.Add(zedGraphControl1);

5. Write the drawing code:

 private void ShowChart()
        {
            zedGraphControl1.GraphPane.CurveList.Clear();
            zedGraphControl1.GraphPane.GraphObjList.Clear();
            // clearing not teste


            GraphPane myPane = zedGraphControl1.GraphPane;


            myPane.Title.Text = "消费者学历统计";  //设计图表的标题
            myPane.XAxis.Title.Text = "学历类型"; //X轴标题
            myPane.YAxis.Title.Text = "人数"; //Y轴标题
            //      myPane.XAxis.Type = ZedGraph.AxisType.Date;
            // Date wont work in our case


            PointPairList PPLa = new PointPairList();
            PointPairList PPLb = new PointPairList();
            PointPairList PPLc = new PointPairList();
            PointPairList PPLd = new PointPairList();


            for (int i = 1; i < 2; i++)
            {
                PPLa.Add(i, i + 3);
                PPLb.Add(i + 1, i + 4);
                PPLc.Add(i + 2, i + 5);
                PPLd.Add(i + 3, i + 6);
            }


            // dragged drawing baritems out of forloop
            BarItem myBara = myPane.AddBar("A", PPLa, Color.Red);
            BarItem myBarb = myPane.AddBar("B", PPLb, Color.Blue);
            BarItem myBarc = myPane.AddBar("C", PPLc, Color.Gray);
            BarItem myBard = myPane.AddBar("D", PPLd, Color.Black);


            zedGraphControl1.AxisChange();
            zedGraphControl1.Refresh();//这句话非常重要，否则不会立即显示
        }

If you need to display text on the abscissa:

 private void ShowChart()
        {
            zedGraphControl1.GraphPane.CurveList.Clear();
            zedGraphControl1.GraphPane.GraphObjList.Clear();
            // clearing not teste


            GraphPane myPane = zedGraphControl1.GraphPane;
            // 画图面版标题
            myPane.Title.Text = "收入统计";
            // 画图面版X标题
            myPane.XAxis.Title.Text = "区域";


            myPane.XAxis.Scale.Min = 0;
            //初始化数据
            PointPairList list = new PointPairList();
            PointPairList list2 = new PointPairList();
            PointPairList list3 = new PointPairList();


            for (int i = 0; i < 5; i++)////这里的数量要和lable的一致，比如横坐标显示了5个lable，这里就要给5个
            {
                list.Add(i, i+1);
                list2.Add(i, i + 2);
                list3.Add(i, i + 3);
            }
            


            // 画图面版Y标题
            myPane.YAxis.Title.Text = "销售情况";
            //柱的画笔
            //    public BarItem AddBar(string 名称, IPointList 数据, Color 颜色);

            BarItem myCurve = myPane.AddBar("收入1", list, Color.Blue);
            BarItem myCurve1 = myPane.AddBar("收入2", list2, Color.Purple);
            BarItem myCurve2 = myPane.AddBar("收入3", list3, Color.YellowGreen);

            //myCurve.Bar.Fill = new Fill(Color.Blue, Color.White, Color.Blue);//渐变
           // BarItem myCurve2 = myPane.AddBar("买农药", list2, Color.Red);
           // myCurve2.Bar.Fill = new Fill(Color.Red, Color.White, Color.Red);
          //  BarItem myCurve3 = myPane.AddBar("买化肥", list3, Color.Green);
           // myCurve3.Bar.Fill = new Fill(Color.Green, Color.White, Color.Green);


            //myPane.XAxis.MajorTic.IsBetweenLabels = true;
            //XAxis标注
            string[] labels = { "产品1", "产品2", "产品3", "产品4", "产品5" };
            myPane.XAxis.Scale.TextLabels = labels;
            myPane.XAxis.Type = AxisType.Text;
            //图区以外的颜色
           // myPane.Fill = new Fill(Color.White, Color.FromArgb(200, 200, 255), 45.0f);
            //背景颜色
           // myPane.Chart.Fill = new Fill(Color.Red, Color.LightGoldenrodYellow, 45.0f);


            zedGraphControl1.AxisChange();
            zedGraphControl1.Refresh();
        }

The above is the detailed explanation of using zedgraph to draw histograms in C#. For more related content, please pay attention to the PHP Chinese website (www.php.cn)!