C#画图之饼图折线图的实现方法

public PlaceHolder PlaceHolder1;

/// </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;}