使用C#画图（饼图折线图）

/// </summary>
        /// <param name="dbDtViewWrk">传递的数据</param>
        /// <param name="strAbsolutePath">绝对路径</param>
        /// <param name="strRelativePath">相对路径</param>
        /// <param name="ChartType">要画的图格式（饼图或者折线图等）</param>
        /// <param name="strTitle">统计名称</param>
public void PaintToImage(DataTable dbDtViewWrk, string strAbsolutePath, string strRelativePath, ChartChartTypeEnum ChartType, string strTitle)

        {
            string strSeriesName = "图例";
            //存放项目
            string[] ItemsName = new string[dbDtViewWrk.Rows.Count];
            //存放数据
            string[] ItemsCount = new string[dbDtViewWrk.Rows.Count];
            //刻度单位
            int iUnit = 1;
            //最大值
            int iMaxValue = 0;
            string strXdata = String.Empty;
            string strYdata = String.Empty;
           
                //为数组赋值
                for (int i = 0; i < dbDtViewWrk.Rows.Count; i++)
                {
                    ItemsName[i] = dbDtViewWrk.Rows[i][0].ToString();  //要统计的字段名字
                    ItemsCount[i] = dbDtViewWrk.Rows[i][5].ToString();//要统计的字段数据
                }
            //为x轴指定特定字符串，以便显示数据
            // string strXdata = String.Empty;
            foreach (string strData in ItemsName)
            {
                strXdata += strData + "\t";
            }
            // string strYdata = String.Empty;
            //为y轴指定特定的字符串，以便与x轴相对应
            foreach (string strValue in ItemsCount)
            {
                strYdata += strValue + "\t";
                if (int.Parse(strValue) > iMaxValue)
                {
                    iMaxValue = int.Parse(strValue);
                }
            }
            if (iMaxValue > 20)
            {
                iUnit = iMaxValue / 10;
            }
            //创建ChartSpace对象来放置图表
            ChartSpace laySpace = new ChartSpaceClass();
            
            //在ChartSpace对象中添加图表
            ChChart InsertChart = laySpace.Charts.Add(0);
            
            //底座颜色
            InsertChart.PlotArea.Interior.Color = "white";

            //指定绘制图表的类型。类型可以通过OWC.ChartChartTypeEnum枚举值得到
            InsertChart.Type = ChartType;//柱形图


            //指定图表是否需要图例标注
            InsertChart.HasLegend = true;
            InsertChart.BarWidth = 0;
            InsertChart.Legend.Position = ChartLegendPositionEnum.chLegendPositionBottom;

            InsertChart.HasTitle = true;//为图表添加标题
            InsertChart.Title.Caption = strTitle;//标题名称

            //为x,y轴添加图示说明
            if (ChartType.ToString().IndexOf("ChartTypePie") == -1)
            {
                InsertChart.Axes[0].Font.Size = 11; //X轴

                InsertChart.Axes[1].Font.Size = 11; //Y轴
                InsertChart.Legend.Font.Size = 11;
                InsertChart.Axes[0].HasTitle = true;
                InsertChart.Axes[0].Title.Caption = "";//月份
                InsertChart.Axes[1].HasTitle = true;
                //InsertChart.Axes[1].Scaling.SplitMinimum = 200;
                InsertChart.Axes[1].Title.Caption = "数量";
                InsertChart.Axes[1].MajorUnit = iUnit;  //刻度单位设置
                InsertChart.Axes[1].Scaling.Minimum = 0;//最小刻度=0
            }

            //添加一个series系列
            InsertChart.SeriesCollection.Add(0);
            
            //给定series系列的名字
            InsertChart.SeriesCollection[0].SetData(ChartDimensionsEnum.chDimSeriesNames, +(int)ChartSpecialDataSourcesEnum.chDataLiteral, strSeriesName);

            //给定分类
            strXdata = strXdata.Substring(0, strXdata.Length - 1);
            InsertChart.SeriesCollection[0].SetData(ChartDimensionsEnum.chDimCategories, +(int)ChartSpecialDataSourcesEnum.chDataLiteral, strXdata);

            //给定值
            strYdata = strYdata.Substring(0, strYdata.Length - 1);
            InsertChart.SeriesCollection[0].SetData(ChartDimensionsEnum.chDimValues, (int)ChartSpecialDataSourcesEnum.chDataLiteral, strYdata);

            //添加标签
            ChDataLabels dls = InsertChart.SeriesCollection[0].DataLabelsCollection.Add();
            if (ChartType.ToString().IndexOf("ChartTypePie") != -1)
            {
                dls.Position = ChartDataLabelPositionEnum.chLabelPositionCenter;
                dls.HasPercentage = false;
                //dls.HasValue = false;
                dls.HasCategoryName = false;
                //指定图表是否需要图例标注
                InsertChart.HasLegend = true;
                InsertChart.Legend.Position = ChartLegendPositionEnum.chLegendPositionBottom;
            }

            //输出文件.
            int iImageLength = 0;
            int iImageWidth = 0;

            //从Config文件取得设置
            //iImageLength = int.Parse(WebConfigurationManager.AppSettings["ShowImageLength"]);
            //iImageWidth = int.Parse(WebConfigurationManager.AppSettings["ShowImageWidth"]);
            iImageLength = 450;
            iImageWidth = 300;

            string strImageName = ChartType.ToString() + "_" + Guid.NewGuid().ToString("N") + ".png";
            laySpace.ExportPicture(strAbsolutePath + strImageName, "PNG", 450, 300);

            //把图片添加到placeholder中，并在页面上显示
            string strImageTag = "<IMG WIDTH=‘450‘ SRC=‘" + strRelativePath + strImageName + "‘/>";
            
            this.PlaceHolder1.Controls.Add(new LiteralControl(strImageTag));
           // return strImageTag;
        }