using System.IO;
using System.Runtime.InteropServices;
using Excel = Microsoft.Office.Interop.Excel;

private void Btn_Click(object sender, EventArgs e)
{

//创建一个EXCEL文档

CreateExcel("标题","文档.XLS", "工作表名");

}

private void CreateExcel(string title,  string fileName, string sheetNames)
{
            //待生成的文件名称
            string FileName = fileName;
            string FilePath = strCurrentPath + FileName;

FileInfo fi = new FileInfo(FilePath);
            if (fi.Exists)     //判断文件是否已经存在,如果存在就删除!
            {
                fi.Delete();
            }
            if (sheetNames != null && sheetNames != "")
            {
                Excel.Application m_Excel = new Excel.Application();//创建一个Excel对象(同时启动EXCEL.EXE进程)
                m_Excel.SheetsInNewWorkbook = 1;//工作表的个数
                Excel._Workbook m_Book = (Excel._Workbook)(m_Excel.Workbooks.Add(Missing.Value));//添加新工作簿
                Excel._Worksheet m_Sheet;

#region 处理

DataSet ds= ScData.ListData("exec Vote_2008.dbo.P_VoteResult_Update " + int.Parse(fdate));
                if (ds.Tables.Count<= 0)
                {
                        MessageBox.Show("没有最新数据!");
                        return;
                 }
                 DataTableToSheet(title,  ds.Tables[0], m_Sheet, m_Book, 0);
                #endregion

#region 保存Excel,清除进程
                m_Book.SaveAs(FilePath, Missing.Value, Missing.Value, Missing.Value, Missing.Value, Missing.Value,   Excel.XlSaveAsAccessMode.xlNoChange, Missing.Value, Missing.Value, Missing.Value, Missing.Value, Missing.Value);
                //m_Excel.ActiveWorkbook._SaveAs(FilePath, Excel.XlFileFormat.xlExcel9795, null, null, false, false, Excel.XlSaveAsAccessMode.xlNoChange, null, null, null, null, null);
                m_Book.Close(false, Missing.Value, Missing.Value);
                m_Excel.Quit();
                System.Runtime.InteropServices.Marshal.ReleaseComObject(m_Book);
                System.Runtime.InteropServices.Marshal.ReleaseComObject(m_Excel);

m_Book = null;
                m_Sheet = null;
                m_Excel = null;
                GC.Collect();
                //this.Close();//关闭窗体

#endregion
            }
   }

#region 将DataTable中的数据写到Excel的指定Sheet中
        /// <summary>
        /// 将DataTable中的数据写到Excel的指定Sheet中
        /// </summary>
        /// <param name="dt"></param>
        /// <param name="m_Sheet"></param>
        public void DataTableToSheet(string title, DataTable dt, Excel._Worksheet m_Sheet,
                                    Excel._Workbook m_Book,  int startrow)
        {

//以下是填写EXCEL中数据
            Excel.Range range = m_Sheet.get_Range(m_Sheet.Cells[1, 1], m_Sheet.Cells[1, 2]);
            range.MergeCells = true;  //合并单元格
            range.Font.Bold = true;   //加粗单元格内字符
            //写入题目
            m_Sheet.Cells[startrow, startrow] = title;
            int rownum = dt.Rows.Count;//行数
            int columnnum = dt.Columns.Count;//列数
            int num = rownum + 2;   //得到数据中的最大行数

//写入列标题
            for (int j = 0; j < columnnum; j++)
            {
                    int bt_startrow = startrow + 1;

//将字段名写入文档
                    m_Sheet.Cells[bt_startrow, 1 + j] = dt.Columns[j].ColumnName;

//单元格内背景色
                    m_Sheet.get_Range(m_Sheet.Cells[bt_startrow, 1 + j], m_Sheet.Cells[bt_startrow, 1 + j]).Interior.ColorIndex = 15;             }

//逐行写入数据
            for (int i = 0; i < rownum; i++)
            {
                for (int j = 0; j < columnnum; j++)
                {
                        m_Sheet.Cells[startrow + 2 + i, 1 + j] = dt.Rows[i][j].ToString();
                }
            }
            m_Sheet.Columns.AutoFit();

//在当前工作表中根据数据生成图表

CreateChart(m_Book, m_Sheet, num);  
        }

private void CreateChart(Excel._Workbook m_Book,Excel._Worksheet m_Sheet,int num)
        {
            Excel.Range oResizeRange;
            Excel.Series oSeries;

m_Book.Charts.Add(Missing.Value, Missing.Value, 1, Missing.Value);
            m_Book.ActiveChart.ChartType = Excel.XlChartType.xlLine;//设置图形

//设置数据取值范围
            m_Book.ActiveChart.SetSourceData(m_Sheet.get_Range("A2", "C" + num.ToString()), Excel.XlRowCol.xlColumns);
            //m_Book.ActiveChart.Location(Excel.XlChartLocation.xlLocationAutomatic, title);
            //以下是给图表放在指定位置
            m_Book.ActiveChart.Location(Excel.XlChartLocation.xlLocationAsObject, m_Sheet.Name);
            oResizeRange = (Excel.Range)m_Sheet.Rows.get_Item(10, Missing.Value);
            m_Sheet.Shapes.Item("Chart 1").Top = (float)(double)oResizeRange.Top;  //调图表的位置上边距
            oResizeRange = (Excel.Range)m_Sheet.Columns.get_Item(6, Missing.Value);  //调图表的位置左边距
           // m_Sheet.Shapes.Item("Chart 1").Left = (float)(double)oResizeRange.Left;
            m_Sheet.Shapes.Item("Chart 1").Width = 400;   //调图表的宽度
            m_Sheet.Shapes.Item("Chart 1").Height = 250;  //调图表的高度

m_Book.ActiveChart.PlotArea.Interior.ColorIndex = 19;  //设置绘图区的背景色
            m_Book.ActiveChart.PlotArea.Border.LineStyle = Excel.XlLineStyle.xlLineStyleNone;//设置绘图区边框线条
            m_Book.ActiveChart.PlotArea.Width = 400;   //设置绘图区宽度
            //m_Book.ActiveChart.ChartArea.Interior.ColorIndex = 10; //设置整个图表的背影颜色
            //m_Book.ActiveChart.ChartArea.Border.ColorIndex = 8;// 设置整个图表的边框颜色
            m_Book.ActiveChart.ChartArea.Border.LineStyle = Excel.XlLineStyle.xlLineStyleNone;//设置边框线条
            m_Book.ActiveChart.HasDataTable = false;

//设置Legend图例的位置和格式
            m_Book.ActiveChart.Legend.Top = 20.00; //具体设置图例的上边距
            m_Book.ActiveChart.Legend.Left = 60.00;//具体设置图例的左边距
            m_Book.ActiveChart.Legend.Interior.ColorIndex = Excel.XlColorIndex.xlColorIndexNone;
            m_Book.ActiveChart.Legend.Width = 150;
            m_Book.ActiveChart.Legend.Font.Size = 9.5;
            //m_Book.ActiveChart.Legend.Font.Bold = true;
            m_Book.ActiveChart.Legend.Font.Name = "宋体";
            //m_Book.ActiveChart.Legend.Position = Excel.XlLegendPosition.xlLegendPositionTop;//设置图例的位置
            m_Book.ActiveChart.Legend.Border.LineStyle = Excel.XlLineStyle.xlLineStyleNone;//设置图例边框线条

//设置X轴的显示
            Excel.Axis xAxis = (Excel.Axis)m_Book.ActiveChart.Axes(Excel.XlAxisType.xlValue, Excel.XlAxisGroup.xlPrimary);
            xAxis.MajorGridlines.Border.LineStyle = Excel.XlLineStyle.xlDot;
            xAxis.MajorGridlines.Border.ColorIndex = 1;//gridLine横向线条的颜色
            xAxis.HasTitle = false;
            xAxis.MinimumScale = 1500;
            xAxis.MaximumScale = 6000;
            xAxis.TickLabels.Font.Name = "宋体";
            xAxis.TickLabels.Font.Size = 9;

//设置Y轴的显示
            Excel.Axis yAxis = (Excel.Axis)m_Book.ActiveChart.Axes(Excel.XlAxisType.xlCategory, Excel.XlAxisGroup.xlPrimary);
            yAxis.TickLabelSpacing = 30;
            yAxis.TickLabels.NumberFormat = "M月D日";
            yAxis.TickLabels.Orientation = Excel.XlTickLabelOrientation.xlTickLabelOrientationHorizontal;//Y轴显示的方向,是水平还是垂直等
            yAxis.TickLabels.Font.Size = 8;
            yAxis.TickLabels.Font.Name = "宋体";

//m_Book.ActiveChart.Floor.Interior.ColorIndex = 8;

oSeries = (Excel.Series)m_Book.ActiveChart.SeriesCollection(1);
            oSeries.Border.ColorIndex = 45;
            oSeries.Border.Weight = Excel.XlBorderWeight.xlThick;
            oSeries = (Excel.Series)m_Book.ActiveChart.SeriesCollection(2);
            oSeries.Border.ColorIndex = 9;
            oSeries.Border.Weight = Excel.XlBorderWeight.xlThick;

}