使用C#和Excel进行报表开发（二）－操作统计图（Chart）

下面的代码使用一个现有的统计图 Excel 文件，加载这个文件，设置某一项的值和统计图的表示方式，然后保存到另一个 Excel 文件里。如果是 VS2005+ Office2003 ，也可以选择使用 Visual Studio Tools for Office 来作。

Excel.Application m_objExcel = null;

Excel._Workbook m_objBook = null;

Excel._Chart m_objChart = null;

Excel.ChartGroup m_objChartGroup = null;

Excel.Series m_objSeries = null;

object m_objOpt = System.Reflection.Missing.Value;

try

{

m_objExcel = new Excel.Application();

m_objBook = m_objExcel.Workbooks.Open("z:\\Book11.xls", m_objOpt, m_objOpt, m_objOpt, m_objOpt, m_objOpt, m_objOpt, m_objOpt, m_objOpt, m_objOpt, m_objOpt, m_objOpt, m_objOpt);

m_objChart = (Excel._Chart)m_objExcel.Charts.get_Item(1);

m_objChart.BarShape = Excel.XlBarShape.xlCylinder;

m_objChartGroup = (Excel.ChartGroup)m_objChart.ChartGroups(1);

m_objSeries = (Excel.Series)m_objChartGroup.SeriesCollection(1);

m_objSeries.Values = 456;

m_objExcel.DisplayAlerts = false;

m_objBook.SaveAs("z:\\Book2.xls", m_objOpt, m_objOpt,

m_objOpt, m_objOpt, m_objOpt, Excel.XlSaveAsAccessMode.xlNoChange,

m_objOpt, m_objOpt, m_objOpt, m_objOpt);

}

catch (Exception ex)

{

MessageBox.Show(ex.Message);

}

finally

{

m_objBook.Close(m_objOpt, m_objOpt, m_objOpt);

m_objExcel.Workbooks.Close();

m_objExcel.Quit();

System.Runtime.InteropServices.Marshal.ReleaseComObject(m_objBook);

System.Runtime.InteropServices.Marshal.ReleaseComObject(m_objExcel);

m_objBook = null;

m_objExcel = null;

GC.Collect();

this.Close();

}

源Excel文件中的统计图：

经过代码处理后保存的统计图：