使用C#和Excel进行报表开发（二）－操作统计图（Chart）

[align=left]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。[/align]
[align=left]Excel.Application m_objExcel = null;[/align]
[align=left]Excel._Workbook m_objBook = null;[/align]
[align=left]Excel._Chart m_objChart = null;[/align]
[align=left]Excel.ChartGroup m_objChartGroup = null;[/align]
[align=left]Excel.Series m_objSeries = null;[/align]
[align=left]object m_objOpt = System.Reflection.Missing.Value;[/align]
[align=left]try[/align]
[align=left]{[/align]
[align=left] m_objExcel = new Excel.Application();[/align]
[align=left] 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);[/align]
[align=left] m_objChart = (Excel._Chart)m_objExcel.Charts.get_Item(1);[/align]
[align=left] m_objChart.BarShape = Excel.XlBarShape.xlCylinder;[/align]
[align=left] m_objChartGroup = (Excel.ChartGroup)m_objChart.ChartGroups(1);[/align]
[align=left] m_objSeries = (Excel.Series)m_objChartGroup.SeriesCollection(1);[/align]
[align=left] [/align]
[align=left] m_objSeries.Values = 456;[/align]
[align=left] m_objExcel.DisplayAlerts = false;[/align]
[align=left] [/align]
[align=left] m_objBook.SaveAs("z://Book2.xls", m_objOpt, m_objOpt,[/align]
[align=left] m_objOpt, m_objOpt, m_objOpt, Excel.XlSaveAsAccessMode.xlNoChange,[/align]
[align=left] m_objOpt, m_objOpt, m_objOpt, m_objOpt);[/align]
[align=left] [/align]
[align=left] }[/align]
[align=left]catch (Exception ex)[/align]
[align=left]{[/align]
[align=left] MessageBox.Show(ex.Message);[/align]
[align=left]}[/align]
[align=left]finally[/align]
[align=left]{[/align]
[align=left] m_objBook.Close(m_objOpt, m_objOpt, m_objOpt);[/align]
[align=left] m_objExcel.Workbooks.Close();[/align]
[align=left] [/align]
[align=left] m_objExcel.Quit();[/align]
[align=left] System.Runtime.InteropServices.Marshal.ReleaseComObject(m_objBook);[/align]
[align=left] System.Runtime.InteropServices.Marshal.ReleaseComObject(m_objExcel);[/align]
[align=left] m_objBook = null;[/align]
[align=left] m_objExcel = null;[/align]
[align=left] GC.Collect();[/align]
[align=left] this.Close();[/align]
}

源Excel文件中的统计图：



经过代码处理后保存的统计图：