C#操作Excel开发报表系列整理

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将Excel应用于报表开发中（一）--开始

目前的商业工具如水晶报表，ActiveReport等，都提供了灵活，强大的功能，但是对于比较特殊化的表格，特别是国内的一些应用，都是一个个的格子组成的，这样要是用线来一根根画就比较麻烦，但是这类工具还都不提供表格化的报表布局定义方式。一个很好的选择是VS2005的客户端报表（RDLC），但是在某几个方面还是不够灵活，例如，灵活性有限制，要想自己编码实现一些复杂逻辑还是有困难；要VS2005，对于一些还在使用VS2003的项目就只有眼馋的份了。用Excel来实现，优点在于页面布局设计灵活，同时使用代码来操作数据要更灵活，更精确。

下面是一个简单的例子，打开一个定义好的Excel文件，这个文件是作为报表的模板，然后向模板的指定格子里填充数据，形成一个报表，在web方式下可以按照指定的命名方式在服务器上生成一个excel文件，之后传送到客户端，由客户端启动excel进行打印。

Excel.Application m_objExcel = null;

Excel._Workbook m_objBook = null;

Excel.Sheets m_objSheets = null;

Excel._Worksheet m_objSheet = null;

Excel.Range m_objRange = null;

object m_objOpt = System.Reflection.Missing.Value;

try

{

m_objExcel = new Excel.Application();

m_objBook = m_objExcel.Workbooks.Open("z:\\Book1.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_objSheets = (Excel.Sheets)m_objBook.Worksheets;

m_objSheet = (Excel._Worksheet)(m_objSheets.get_Item(1));

string[] info = new string[5] { "Cure", "26", "dahuzizyd.cnblogs.com", "汉", "按时 ?放奥斯丁奥斯丁非是否奥斯丁非" };

m_objRange = m_objSheet.get_Range("B1", m_objOpt);

m_objRange.Value = info[0];

m_objRange = m_objSheet.get_Range("E1", m_objOpt);

m_objRange.Value = info[1];

m_objRange = m_objSheet.get_Range("B2", m_objOpt);

m_objRange.Value = info[2];

m_objRange = m_objSheet.get_Range("E2", m_objOpt);

m_objRange.Value = info[3];

m_objRange = m_objSheet.get_Range("A3", m_objOpt);

m_objRange.Value = info[4];

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();

}

可以看到，使用Excel要进行一部分的编码，好在这部分还不太复杂，但是最大的问题就在于当报表需求变更时，要重新编译部署，而且当格子特别多的时候，要这样硬编码还是挺痛苦的一件事。不过使用Excel毕竟给我们提供了一种选择，可以在开发时对多种方案权衡利弊，使用最适合项目的。

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：

使用C#和Excel进行报表开发（三）－生成统计图（Chart）

有的Web项目选用Excel作为报表方案，在服务器端生成Excel文件，然后传送到客户端，由客户端进行打印。在国内的环境下，相对PDF方式，Excel的安装率应该比pdf阅读器的安装率要高，同时，微软也为C#操作Excel提供了完备的接口，虽然ZedGraph和其他的商业报表工具生成的统计图也很好，但是人家微软毕竟是大品牌，值得信赖。

本文介绍使用C#调用Excel来生成统计图（Chart）的以及Chart图中各部分控制的一些方法。

在上一篇使用C#和Excel进行报表开发（二）－操作统计图（Chart）中，我们使用一个预定义的Excel文件，通过改变Chart中的某个值来生成统计图。本文进一步演示如何从指定的数据从头生成统计图。

首先当然要添加对Excel的引用，然后需要定义几个要用到的Excel对象：

Excel.Application ThisApplication = null;

Excel.Workbooks m_objBooks = null;

Excel._Workbook ThisWorkbook = null;

Excel.Worksheet xlSheet = null;

在创建一个新的_WorkBook对象的时候，默认的会含有3个Sheet，所以为了显示清晰，将多余的Sheet都删掉：

private void DeleteSheet()

{

foreach (Excel.Worksheet ws in ThisWorkbook.Worksheets)

if (ws != ThisApplication.ActiveSheet)

{

ws.Delete();

}

foreach (Excel.Chart cht in ThisWorkbook.Charts)

cht.Delete();

}

再下来需要添加用来给Chart提供数据的Sheet：

private void AddDatasheet()

{

xlSheet = (Excel.Worksheet)ThisWorkbook.

Worksheets.Add(Type.Missing, ThisWorkbook.ActiveSheet,

Type.Missing, Type.Missing);

xlSheet.Name = "数据";

}

生成Chart用到的数据，因为是演示，所以这里使用生成随机数的方法来替代从数据库中提取数据。

private void LoadData()

{

Random ran = new Random();

for (int i = 1; i <= 12; i++)

{

xlSheet.Cells[i, 1] = i.ToString() + "月";

xlSheet.Cells[i, 2] = ran.Next(2000).ToString();

}

好了，到此，准备工作全部已经就绪，下面要进行Chart的生成设置部分了：

生成一个统计图对象：

Excel.Chart xlChart = (Excel.Chart)ThisWorkbook.Charts.

Add(Type.Missing, xlSheet, Type.Missing, Type.Missing);

设定数据来源：

Excel.Range cellRange = (Excel.Range)xlSheet.Cells[1, 1];

通过向导生成Chart：

xlChart.ChartWizard(cellRange.CurrentRegion,

Excel.XlChartType.xl3DColumn, Type.Missing,

Excel.XlRowCol.xlColumns,1, 0, true ,

"访问量比较(dahuzizyd.cnblogs.com)", "月份", "访问量",

"");

到此，Chart的生成就完成了，貌似比较简单，下面我们对其作一些设置，好更漂亮些。

设置统计图Sheet的名称：

xlChart.Name = "统计";

现在的统计图只有一个组，他们会显示成一样的颜色，我们来让12个Bar都显示不同的颜色：

Excel.ChartGroup grp = (Excel.ChartGroup)xlChart.ChartGroups(1);

grp.GapWidth = 20;

grp.VaryByCategories = true;

现在Chart的条目的显示形状是Box，我们让它们变成圆柱形，并给它们显示加上数据标签：

Excel.Series s = (Excel.Series)grp.SeriesCollection(1);

s.BarShape = XlBarShape.xlCylinder;

s.HasDataLabels = true;

下面再来设置统计图的标题和图例的显示：

xlChart.Legend.Position = XlLegendPosition.xlLegendPositionTop;

xlChart.ChartTitle.Font.Size = 24;

xlChart.ChartTitle.Shadow = true;

xlChart.ChartTitle.Border.LineStyle = Excel.XlLineStyle.xlContinuous;

最后设置两个轴的属性，Excel.XlAxisType.xlValue对应的是Y轴，Excel.XlAxisType.xlCategory对应的是X轴：

Excel.Axis valueAxis = (Excel.Axis)xlChart.Axes(Excel.XlAxisType.xlValue, XlAxisGroup.xlPrimary);

valueAxis.AxisTitle.Orientation = -90;

Excel.Axis categoryAxis = (Excel.Axis)xlChart.Axes(Excel.XlAxisType.xlCategory, XlAxisGroup.xlPrimary);

categoryAxis.AxisTitle.Font.Name = "MS UI Gothic";

到此，一切就绪了，下面要生成Chart，并将其存为一个Excel文件：

try
{
    ThisApplication = new Excel.Application();
    m_objBooks = (Excel.Workbooks)ThisApplication.Workbooks;
    ThisWorkbook = (Excel._Workbook)(m_objBooks.Add(Type.Missing));

    ThisApplication.DisplayAlerts = false;

    this.DeleteSheet();
    this.AddDatasheet();
    this.LoadData();

    CreateChart();

    ThisWorkbook.SaveAs("z:\\Book2.xls", Type.Missing, Type.Missing,
                    Type.Missing, Type.Missing, Type.Missing, Excel.XlSaveAsAccessMode.xlNoChange,
                Type.Missing, Type.Missing, Type.Missing, Type.Missing);

}
catch (Exception ex)
{
    MessageBox.Show(ex.Message);
}
finally
{
    ThisWorkbook.Close(Type.Missing, Type.Missing, Type.Missing);
    ThisApplication.Workbooks.Close();

    ThisApplication.Quit();
            System.Runtime.InteropServices.Marshal.ReleaseComObject(ThisWorkbook);
                System.Runtime.InteropServices.Marshal.ReleaseComObject(ThisApplication);
    ThisWorkbook = null;
    ThisApplication = null;
    GC.Collect();
    this.Close();
}

运行你的程序，打开生成的Excel文件，最终生成的Chart应该像这样：

完成了Chart的生成，但是上面对于每个月只有一项数据，如果我想显示多项呢，例如显示每个月两个页面的范围量的对比。方法很简单，只要再多生成一组数据就可以了，我们修改下LoadData方法：

private void LoadData()

{

Random ran = new Random();

for (int i = 1; i <= 12; i++)

{

xlSheet.Cells[i, 1] = i.ToString() + "月";

xlSheet.Cells[i, 2] = ran.Next(2000).ToString();

xlSheet.Cells[i, 3] = ran.Next(1500).ToString();

}

再次运行程序，生成Chart看看，应该像下面的效果:

可以看到，两组数据以不同的形状显示，同时，图例部分也不再显示1－12月共12项，而是显示两项，这是因为在上面的代码中我们设置了ChartGroup的VaryByCategories 属性：

grp.VaryByCategories = true;当我们有两个以上的组时，这一项就失效了。

在用C#操作Excel的时候，恐怕最大的困难就在于不知道Excel提供的各个对象，以及它们的属性，方法等信息，好在MSDN里有关于Excel的接口说明－Excel Primary Interop Assembly Reference，参照这些，相信很快就能上手了。

使用C#和Excel进行报表开发（四）－复制单元格

在用Excel作报表的时候，可能会碰到分页的情况，这样就要分成多个Sheet显示，如果要在每页都保留表头，就需要将第一页作为模板设计的表头部分拷贝到其他的Sheet上，这时就要用用到Excel中的单元格拷贝。

下面的代码说明如何一个Sheet上的选定内容拷贝到另一个Sheet上：

ThisApplication = new Excel.Application();

ThisWorkbook = ThisApplication.Workbooks.Open("z:\\Book1.xls", Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing,Type.Missing);

ThisApplication.DisplayAlerts = false;

xlSheet = (Excel.Worksheet)ThisWorkbook.Worksheets.get_Item(1);

Excel.Range range = xlSheet.get_Range("A1", Type.Missing);

range.Value = "123";

Excel.Worksheet sheet1 = (Excel.Worksheet)ThisWorkbook.Worksheets.get_Item(2);

Excel.Range range1 = sheet1.get_Range("B1", Type.Missing);

range.Copy(range1);

ThisWorkbook.SaveAs("z:\\Book2.xls", Type.Missing, Type.Missing,

Type.Missing, Type.Missing, Type.Missing, Excel.XlSaveAsAccessMode.xlNoChange,

Type.Missing, Type.Missing, Type.Missing, Type.Missing);

可以看到，核心的代码是很简单的，就是选定一个源区域，然后指定另一个目标区域，调用源区域的Copy方法将内容整个复制到目标区域，但是你会发现是连单元格的格式等属性一并拷贝过去的，如果要只拷贝单元格中的文本呢？那就要用到windows剪贴板了：

xlSheet = (Excel.Worksheet)ThisWorkbook.Worksheets.get_Item(1);

Excel.Range range = xlSheet.get_Range("A1", Type.Missing);

range.Value = "123";

System.Windows.Forms.Clipboard.SetDataObject(range.Value.ToString());

Excel.Worksheet sheet1 = (Excel.Worksheet)ThisWorkbook.Worksheets.get_Item(2);

Excel.Range range1 = sheet1.get_Range("B1", Type.Missing);

sheet1.Paste(range1, false);

要注意的是，这种方式只能选一个单元格，复制一个，不能选定一批单元格进行复制。

上面的例子只给出了主要部分的代码，其他的像销毁Excel进程等操作请参考前面的几篇Excel作报表的随笔。

使用C#和Excel进行报表开发（五）－操作单元格边框和颜色

在用Excel作报表的时候，可能需要操作单元格的边框和填充颜色和纹理等操作，下面的代码说明如何设置选中的单元格的填充纹理和边框

try

{

ThisApplication = new Excel.Application();

ThisApplication.DisplayAlerts = false;

xlSheet = (Excel.Worksheet)ThisWorkbook.Worksheets.get_Item(1);

Excel.Range range = xlSheet.get_Range("G4","H5");

range.Value = "123";

Excel.Style st = ThisWorkbook.Styles.Add("PropertyBorder", Type.Missing);

range.Interior.Pattern = Excel.XlPattern.xlPatternCrissCross;

range.Borders.Weight = 2;

range.Borders.get_Item(XlBordersIndex.xlEdgeRight).LineStyle = Excel.XlLineStyle.xlContinuous;

range.Borders.get_Item(XlBordersIndex.xlEdgeBottom).LineStyle = Excel.XlLineStyle.xlContinuous;

range.Borders.get_Item(XlBordersIndex.xlEdgeTop).LineStyle = Excel.XlLineStyle.xlContinuous;

range.Borders.get_Item(XlBordersIndex.xlDiagonalDown).LineStyle = Excel.XlLineStyle.xlLineStyleNone;

range.Borders.get_Item(XlBordersIndex.xlDiagonalUp).LineStyle = Excel.XlLineStyle.xlLineStyleNone;

range.Borders.get_Item(XlBordersIndex.xlInsideHorizontal).LineStyle = Excel.XlLineStyle.xlLineStyleNone;

range.Borders.get_Item(XlBordersIndex.xlInsideVertical).LineStyle = Excel.XlLineStyle.xlLineStyleNone;

range.Borders.get_Item(XlBordersIndex.xlEdgeLeft).LineStyle = Excel.XlLineStyle.xlDot;

range.Borders.get_Item(XlBordersIndex.xlEdgeLeft).Color = System.Drawing.ColorTranslator.ToOle(Color.Red);

ThisWorkbook.SaveAs("z:\\Book2.xls", Type.Missing, Type.Missing,

Type.Missing, Type.Missing, Type.Missing, Excel.XlSaveAsAccessMode.xlNoChange,

Type.Missing, Type.Missing, Type.Missing, Type.Missing);

}

catch (Exception ex)

{

MessageBox.Show(ex.Message);

}

finally

{

ThisWorkbook.Close(Type.Missing, Type.Missing, Type.Missing);

ThisApplication.Workbooks.Close();

ThisApplication.Quit();

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

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

ThisWorkbook = null;

ThisApplication = null;

GC.Collect();

this.Close();

}

使用C#和Excel进行报表开发（六）－操作行和列

在Excel中，行和列实际上仍然是Range，只不过取得行和列的方法和前面几篇随笔出现的有点不同，要使用Worksheet的Rows和Columns属性的get_Item方法，下面是例子代码，演示了怎样选中行，并且在行之间复制数据，和插入行：

ThisApplication = new Excel.Application();

ThisApplication.DisplayAlerts = false;

xlSheet = (Excel.Worksheet)ThisWorkbook.Worksheets.get_Item(1);

//Excel.Range range = xlSheet.get_Range("G4",Type.Missing);

Excel.Range range = (Excel.Range)xlSheet.Rows.get_Item(18, Type.Missing);

Excel.Range range1 = (Excel.Range)xlSheet.Rows.get_Item(19, Type.Missing);

range.Value = "123";

range.Copy(range1);

range1.Rows.Insert(XlInsertShiftDirection.xlShiftDown);

ThisWorkbook.SaveAs("z:\\Book2.xls", Type.Missing, Type.Missing,

Type.Missing, Type.Missing, Type.Missing, Excel.XlSaveAsAccessMode.xlNoChange,

Type.Missing, Type.Missing, Type.Missing, Type.Missing);

关于Excel进程的释放，前面几篇随笔已经有了，这里就不再重复了。

使用C#和Excel进行报表开发（七）－设置单元格的显示格式

在Excel中，如果某个单元格的内容是数字，且比较长，默认情况下，会变为科学计数发表示，例如：123456789123456000会被表示为1.2345E+17，为了能够将数字按照普通的格式完全表示，就需要设置单元格的属性，下面是例子代码：

Excel.Application m_objExcel = null;

            Excel._Workbook m_objBook = null;

            Excel.Sheets m_objSheets = null;

            Excel._Worksheet m_objSheet = null;

            Excel.Range m_objRange = null;


            object m_objOpt = System.Reflection.Missing.Value;

            try
            {
                m_objExcel = new Excel.Application();

                m_objBook = m_objExcel.Workbooks.Open("e:\\1.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_objOpt, m_objOpt);

                m_objSheets = (Excel.Sheets)m_objBook.Worksheets;

                m_objSheet = (Excel._Worksheet)(m_objSheets.get_Item(1));

                m_objRange = m_objSheet.get_Range("A1", m_objOpt);

                m_objRange.NumberFormatLocal = "#";


                m_objBook.SaveAs("e:\\22.xls", m_objOpt, m_objOpt,

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

                                                m_objOpt, 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();

            }

使用C#和Excel进行报表开发（八）－用程序绑定数据源

本文演示一个简单的办法，并使用程序将一个dataset中的内容填充到指定的格子中，目的是尽可能的通用，从而避免C#代码必须知道Excel文件中字段和内容的位置的情况。

先制作一个简单的Excel文件作为模板，为了防止要填充的Cell中的内容和标题的内容一样，所以要填充内容的Cell中的内容是“$” + 字段名(要和DataTable中的列名一致），效果如图：

创建一个Winform程序，给窗体上添加两个按钮，代码分别为：
创建Xml：

private void button1_Click(object sender, EventArgs e)
        {
            DataColumn dcName = new DataColumn("name", typeof(string));
            DataColumn dcAge = new DataColumn("age", typeof(int));
            DataColumn dcMemo = new DataColumn("memo", typeof(string));

            DataTable dt = new DataTable();
            dt.Columns.Add(dcName);
            dt.Columns.Add(dcAge);
            dt.Columns.Add(dcMemo);

            DataRow dr = dt.NewRow();
            dr["name"] = "dahuzizyd";
            dr["age"] = "20";
            dr["memo"] = "dahuzizyd.cnblogs.com";

            dt.Rows.Add(dr);
            dt.AcceptChanges();

            DataSet ds = new DataSet();
            ds.Tables.Add(dt);

            ds.WriteXml(Application.StartupPath +"\\ExcelBindingXml.xml");

        }

提取xml并且加载到Excel模板上，再另存：

private void button2_Click(object sender, EventArgs e)
        {
            DataSet ds = new DataSet();
            ds.ReadXml(Application.StartupPath + "\\ExcelBindingXml.xml");

            Excel.Application m_objExcel = null;

            Excel._Workbook m_objBook = null;

            Excel.Sheets m_objSheets = null;

            Excel._Worksheet m_objSheet = null;

            Excel.Range m_objRange = null;

            object m_objOpt = System.Reflection.Missing.Value;

            try
            {

                m_objExcel = new Excel.Application();
                m_objBook = m_objExcel.Workbooks.Open(Application.StartupPath + "\\ExcelTemplate.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_objOpt, m_objOpt);
                m_objSheets = (Excel.Sheets)m_objBook.Worksheets;
                m_objSheet = (Excel._Worksheet)(m_objSheets.get_Item(1));

                foreach (DataRow dr in ds.Tables[0].Rows)
                {
                    for (int col = 0; col < ds.Tables[0].Columns.Count; col++)
                    {
                        for (int excelcol = 1; excelcol < 8; excelcol++)
                        {
                            for (int excelrow = 1; excelrow < 5; excelrow++)
                            {
                                string excelColName = ExcelColNumberToColText(excelcol);

                                m_objRange = m_objSheet.get_Range(excelColName + excelrow.ToString(), m_objOpt);

                                if ( m_objRange.Text.ToString().Replace("$","") == ds.Tables[0].Columns[col].ColumnName )
                                {
                                    m_objRange.Value2 = dr[col].ToString();
                                }
                            }

                        }
                    }
                }

                m_objExcel.DisplayAlerts = false;
                m_objBook.SaveAs(Application.StartupPath + "\\ExcelBindingXml.xls", m_objOpt, m_objOpt,
                m_objOpt, m_objOpt, m_objOpt, Excel.XlSaveAsAccessMode.xlNoChange,

                                                m_objOpt, 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();
            }
        }

下面是一个辅助函数，主要是将整数的列序号转换到Excel用的以字母表示的列号，Excel最大列数为255。

private string ExcelColNumberToColText(int colNumber)
        {
            string colText = "";

            int colTextLength = colNumber / 26;
            int colTextLast = colNumber % 26;

            if (colTextLast != 0)
            {
                switch (colTextLength)
                {
                    case 0: break;
                    case 1: colText = "A"; break;
                    case 2: colText = "B"; break;
                    case 3: colText = "C"; break;
                    case 4: colText = "D"; break;
                    case 5: colText = "E"; break;
                    case 6: colText = "F"; break;
                    case 7: colText = "G"; break;
                    case 8: colText = "H"; break;
                    case 9: colText = "I"; break;
                    default: break;
                }
            }
            else
            {
                switch (colTextLength)
                {
                    case 1: colText = ""; break;
                    case 2: colText = "A"; break;
                    case 3: colText = "B"; break;
                    case 4: colText = "C"; break;
                    case 5: colText = "D"; break;
                    case 6: colText = "E"; break;
                    case 7: colText = "F"; break;
                    case 8: colText = "G"; break;
                    case 9: colText = "H"; break;
                    default: break;
                }
            }

            switch (colTextLast)
            {
                case 0:colText = colText + "Z"; break;
                case 1: colText = colText + "A"; break;
                case 2: colText = colText + "B"; break;
                case 3: colText = colText + "C"; break;
                case 4: colText = colText + "D"; break;
                case 5: colText = colText + "E"; break;
                case 6: colText = colText + "F"; break;
                case 7: colText = colText + "G"; break;
                case 8: colText = colText + "H"; break;
                case 9: colText = colText + "I"; break;
                case 10: colText = colText + "J"; break;
                case 11: colText = colText + "K"; break;
                case 12: colText = colText + "L"; break;
                case 13: colText = colText + "M"; break;
                case 14: colText = colText + "N"; break;
                case 15: colText = colText + "O"; break;
                case 16: colText = colText + "P"; break;
                case 17: colText = colText + "Q"; break;
                case 18: colText = colText + "R"; break;
                case 19: colText = colText + "S"; break;
                case 20: colText = colText + "T"; break;
                case 21: colText = colText + "U"; break;
                case 22: colText = colText + "V"; break;
                case 23: colText = colText + "W"; break;
                case 24: colText = colText + "X"; break;
                case 25: colText = colText + "Y"; break;

                default: break;
            }

            return colText;
        }

运行完成后，生成的Excel如下图：