NPOI、MyXls、Aspose.Cells 导入导出Excel

Excel导入及导出问题产生：

　　从接触.net到现在一直在维护一个DataTable导s出到Excel的类，时不时还会维护一个导入类。以下是时不时就会出现的问题：

导出问题：

　　如果是asp.net，你得在服务器端装Office，几百M呢，还得及时更新它，以防漏洞，还得设定权限允许ASP.net访问COM+，听说如果导出过程中出问题可能导致服务器宕机。

　　Excel会把只包含数字的列进行类型转换，本来是文本型的，它非要把你转成数值型的，像身份证后三位变成000，编号000123会变成123，够智能吧，够郁闷吧。不过这些都还是可以变通解决的，在他们前边加上一个字母，让他们不只包含数字。

　　导出时，如果你的字段内容以"-"或"="开头，Excel好像把它当成了公式什么的，接下来就出错，提示：类似，保存到Sheet1的问题

导入问题：

　　Excel会根据你的 Excel文件前8行分析数据类型，如果正好你前8行某一列只是数字，那它会认为你这一列就是数值型的，然后，身份证，手机，编号都转吧变成类似这样的1.42702E+17格式，日期列变成 包含日期和数字的，乱的很，可以通过改注册表让Excel分析整个表，但如果整列都是数字，那这个问题还是解决不了。

以上问题，一般人初次做时肯定得上网查查吧，一个问题接着另一个问题，查到你郁郁而死，还有很多问题没解决，最终感觉已经解决的不错了，但还不能保证某一天还会出个什么问题。

使用第三方开源组件导入及导出Excel的解决方案：

　　NPOI || MyXls || Aspose.Cells == 研究几年Excel。

　　NPOI开源地址：http://npoi.codeplex.com/
NPOI中文文档：http://www.cnblogs.com/tonyqus/archive/2009/04/12/1434209.html

　　MyXls开源地址：http://sourceforge.net/projects/myxls/

     Aspose.Cells是个商业软件，下载地址：http://www.evget.com/zh-CN/product/563/feature_en.aspx

下面来两个简单入门例子：
MyXls 快速入门例子:

/// <summary>
/// MyXls简单Demo，快速入门代码
/// </summary>
/// <param name="dtSource"></param>
/// <param name="strFileName"></param>
/// <remarks>MyXls认为Excel的第一个单元格是：(1,1)</remarks>
/// <Author>柳永法 http://www.yongfa365.com/ 2010-5-8 22:21:41</Author>
publicstaticvoid ExportEasy(DataTable dtSource, string strFileName)
{
XlsDocument xls = new XlsDocument();
Worksheet sheet = xls.Workbook.Worksheets.Add("Sheet1");

//填充表头
foreach (DataColumn col in dtSource.Columns)
{
sheet.Cells.Add(1, col.Ordinal + 1, col.ColumnName);
}

//填充内容
for (int i = 0; i < dtSource.Rows.Count; i++)
{
for (int j = 0; j < dtSource.Columns.Count; j++)
{
sheet.Cells.Add(i + 2, j + 1, dtSource.Rows[i][j].ToString());
}
}

//保存
xls.FileName = strFileName;
xls.Save();
}

/// <summary>
/// MyXls简单Demo，快速入门代码
/// </summary>
/// <param name="dtSource"></param>
/// <param name="strFileName"></param>
/// <remarks>MyXls认为Excel的第一个单元格是：(1,1)</remarks>
/// <Author>柳永法 http://www.yongfa365.com/ 2010-5-8 22:21:41</Author>
public static void ExportEasy(DataTable dtSource,  string strFileName)
{
    XlsDocument xls = new XlsDocument();
    Worksheet sheet = xls.Workbook.Worksheets.Add("Sheet1");

    //填充表头
    foreach (DataColumn col in dtSource.Columns)
    {
        sheet.Cells.Add(1, col.Ordinal + 1, col.ColumnName);
    }

    //填充内容
    for (int i = 0; i < dtSource.Rows.Count; i++)
    {
        for (int j = 0; j < dtSource.Columns.Count; j++)
        {
            sheet.Cells.Add(i + 2, j + 1, dtSource.Rows[i][j].ToString());
        }
    }

    //保存
    xls.FileName = strFileName;
    xls.Save();
}

NPOI 快速入门例子:

/// <summary>
/// NPOI简单Demo，快速入门代码
/// </summary>
/// <param name="dtSource"></param>
/// <param name="strFileName"></param>
/// <remarks>NPOI认为Excel的第一个单元格是：(0，0)</remarks>
/// <Author>柳永法 http://www.yongfa365.com/ 2010-5-8 22:21:41</Author>
publicstaticvoid ExportEasy(DataTable dtSource, string strFileName)
{
HSSFWorkbook workbook = new HSSFWorkbook();
HSSFSheet sheet = workbook.CreateSheet();

//填充表头
HSSFRow dataRow = sheet.CreateRow(0);
foreach (DataColumn column in dtSource.Columns)
{
dataRow.CreateCell(column.Ordinal).SetCellValue(column.ColumnName);
}


//填充内容
for (int i = 0; i < dtSource.Rows.Count; i++)
{
dataRow = sheet.CreateRow(i + 1);
for (int j = 0; j < dtSource.Columns.Count; j++)
{
dataRow.CreateCell(j).SetCellValue(dtSource.Rows[i][j].ToString());
}
}


//保存
using (FileStream fs = new FileStream(strFileName, FileMode.Create, FileAccess.Write))
{
workbook.Write(fs);
}
workbook.Dispose();
}

/// <summary>
/// NPOI简单Demo，快速入门代码
/// </summary>
/// <param name="dtSource"></param>
/// <param name="strFileName"></param>
/// <remarks>NPOI认为Excel的第一个单元格是：(0，0)</remarks>
/// <Author>柳永法 http://www.yongfa365.com/ 2010-5-8 22:21:41</Author>
public static void ExportEasy(DataTable dtSource, string strFileName)
{
    HSSFWorkbook workbook = new HSSFWorkbook();
    HSSFSheet sheet = workbook.CreateSheet();

    //填充表头
    HSSFRow dataRow = sheet.CreateRow(0);
    foreach (DataColumn column in dtSource.Columns)
    {
        dataRow.CreateCell(column.Ordinal).SetCellValue(column.ColumnName);
    }


    //填充内容
    for (int i = 0; i < dtSource.Rows.Count; i++)
    {
        dataRow = sheet.CreateRow(i + 1);
        for (int j = 0; j < dtSource.Columns.Count; j++)
        {
            dataRow.CreateCell(j).SetCellValue(dtSource.Rows[i][j].ToString());
        }
    }


    //保存
    using (FileStream fs = new FileStream(strFileName, FileMode.Create, FileAccess.Write))
    {
        workbook.Write(fs);
    }
    workbook.Dispose();
}

接下来是柳永法(yongfa365)'Blog封装的可以用在实际项目中的类，实现的功能有（仅NPOI）：

1. 支持web及winform从DataTable导出到Excel。
2. 生成速度很快。
3. 准确判断数据类型，不会出现身份证转数值等上面提到的一系列问题。
4. 如果单页条数大于65535时会新建工作表。
5. 列宽自适应。
6. 支持读取Excel。
7. 调用方便，只一调用一个静态类就OK了。

因为测试期间发现MyXls导出速度要比NPOI慢3倍，而NPOI既能满足我们的导出需求，又能很好的满足我们的导入需求，所以只针对NPOI进行全方位功能实现及优化。

MyXls导出相关类：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using org.in2bits.MyXls;
using org.in2bits.MyXls.ByteUtil;
using System.Data;

class ExcelHelper
{
publicstaticvoid Export(DataTable dtSource, string strHeaderText, string strFileName)
{
XlsDocument xls = new XlsDocument();
xls.FileName = DateTime.Now.ToString("yyyyMMddHHmmssffff", System.Globalization.DateTimeFormatInfo.InvariantInfo);
xls.SummaryInformation.Author = "yongfa365"; //填加xls文件作者信息
xls.SummaryInformation.NameOfCreatingApplication = "liu yongfa"; //填加xls文件创建程序信息
xls.SummaryInformation.LastSavedBy = "LastSavedBy"; //填加xls文件最后保存者信息
xls.SummaryInformation.Comments = "Comments"; //填加xls文件作者信息
xls.SummaryInformation.Title = "title"; //填加xls文件标题信息
xls.SummaryInformation.Subject = "Subject";//填加文件主题信息
xls.DocumentSummaryInformation.Company = "company";//填加文件公司信息


Worksheet sheet = xls.Workbook.Worksheets.Add("Sheet1");//状态栏标题名称
Cells cells = sheet.Cells;

foreach (DataColumn col in dtSource.Columns)
{
Cell cell = cells.Add(1, col.Ordinal + 1, col.ColumnName);
cell.Font.FontFamily = FontFamilies.Roman; //字体
cell.Font.Bold = true; //字体为粗体

}
#region 填充内容
XF dateStyle = xls.NewXF();
dateStyle.Format = "yyyy-mm-dd";

for (int i = 0; i < dtSource.Rows.Count; i++)
{
for (int j = 0; j < dtSource.Columns.Count; j++)
{

int rowIndex = i + 2;
int colIndex = j + 1;
string drValue = dtSource.Rows[i][j].ToString();

switch (dtSource.Rows[i][j].GetType().ToString())
{
case"System.String"://字符串类型
cells.Add(rowIndex, colIndex, drValue);
break;
case"System.DateTime"://日期类型
DateTime dateV;
DateTime.TryParse(drValue, out dateV);
cells.Add(rowIndex, colIndex, dateV, dateStyle);
break;
case"System.Boolean"://布尔型
bool boolV = false;
bool.TryParse(drValue, out boolV);
cells.Add(rowIndex, colIndex, boolV);
break;
case"System.Int16"://整型
case"System.Int32":
case"System.Int64":
case"System.Byte":
int intV = 0;
int.TryParse(drValue, out intV);
cells.Add(rowIndex, colIndex, intV);
break;
case"System.Decimal"://浮点型
case"System.Double":
double doubV = 0;
double.TryParse(drValue, out doubV);
cells.Add(rowIndex, colIndex, doubV);
break;
case"System.DBNull"://空值处理
cells.Add(rowIndex, colIndex, null);
break;
default:
cells.Add(rowIndex, colIndex, null);
break;
}
}
}

#endregion

xls.FileName = strFileName;
xls.Save();
}
}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using org.in2bits.MyXls;
using org.in2bits.MyXls.ByteUtil;
using System.Data;

class ExcelHelper
{
    public static void Export(DataTable dtSource, string strHeaderText, string strFileName)
    {
        XlsDocument xls = new XlsDocument();
        xls.FileName = DateTime.Now.ToString("yyyyMMddHHmmssffff", System.Globalization.DateTimeFormatInfo.InvariantInfo);
        xls.SummaryInformation.Author = "yongfa365"; //填加xls文件作者信息
        xls.SummaryInformation.NameOfCreatingApplication = "liu yongfa"; //填加xls文件创建程序信息
        xls.SummaryInformation.LastSavedBy = "LastSavedBy"; //填加xls文件最后保存者信息
        xls.SummaryInformation.Comments = "Comments"; //填加xls文件作者信息
        xls.SummaryInformation.Title = "title"; //填加xls文件标题信息
        xls.SummaryInformation.Subject = "Subject";//填加文件主题信息
        xls.DocumentSummaryInformation.Company = "company";//填加文件公司信息


        Worksheet sheet = xls.Workbook.Worksheets.Add("Sheet1");//状态栏标题名称
        Cells cells = sheet.Cells;

        foreach (DataColumn col in dtSource.Columns)
        {
            Cell cell = cells.Add(1, col.Ordinal + 1, col.ColumnName);
            cell.Font.FontFamily = FontFamilies.Roman; //字体
            cell.Font.Bold = true;  //字体为粗体  

        }
        #region 填充内容
        XF dateStyle = xls.NewXF();
        dateStyle.Format = "yyyy-mm-dd";

        for (int i = 0; i < dtSource.Rows.Count; i++)
        {
            for (int j = 0; j < dtSource.Columns.Count; j++)
            {

                int rowIndex = i + 2;
                int colIndex = j + 1;
                string drValue = dtSource.Rows[i][j].ToString();

                switch (dtSource.Rows[i][j].GetType().ToString())
                {
                    case "System.String"://字符串类型
                        cells.Add(rowIndex, colIndex, drValue);
                        break;
                    case "System.DateTime"://日期类型
                        DateTime dateV;
                        DateTime.TryParse(drValue, out dateV);
                        cells.Add(rowIndex, colIndex, dateV, dateStyle);
                        break;
                    case "System.Boolean"://布尔型
                        bool boolV = false;
                        bool.TryParse(drValue, out boolV);
                        cells.Add(rowIndex, colIndex, boolV);
                        break;
                    case "System.Int16"://整型
                    case "System.Int32":
                    case "System.Int64":
                    case "System.Byte":
                        int intV = 0;
                        int.TryParse(drValue, out intV);
                        cells.Add(rowIndex, colIndex, intV);
                        break;
                    case "System.Decimal"://浮点型
                    case "System.Double":
                        double doubV = 0;
                        double.TryParse(drValue, out doubV);
                        cells.Add(rowIndex, colIndex, doubV);
                        break;
                    case "System.DBNull"://空值处理
                        cells.Add(rowIndex, colIndex, null);
                        break;
                    default:
                        cells.Add(rowIndex, colIndex, null);
                        break;
                }
            }
        }

        #endregion

        xls.FileName = strFileName;
        xls.Save();
    }
}

NPOI导入导出相关类：

using System;
using System.Collections.Generic;
using System.Data;
using System.IO;
using System.Text;
using System.Web;
using NPOI;
using NPOI.HPSF;
using NPOI.HSSF;
using NPOI.HSSF.UserModel;
using NPOI.HSSF.Util;
using NPOI.POIFS;
using NPOI.Util;


publicclass ExcelHelper
{
/// <summary>
/// DataTable导出到Excel文件
/// </summary>
/// <param name="dtSource">源DataTable</param>
/// <param name="strHeaderText">表头文本</param>
/// <param name="strFileName">保存位置</param>
/// <Author>柳永法 http://www.yongfa365.com/ 2010-5-8 22:21:41</Author>
publicstaticvoid Export(DataTable dtSource, string strHeaderText, string strFileName)
{
using (MemoryStream ms = Export(dtSource, strHeaderText))
{
using (FileStream fs = new FileStream(strFileName, FileMode.Create, FileAccess.Write))
{
byte[] data = ms.ToArray();
fs.Write(data, 0, data.Length);
fs.Flush();
}
}
}

/// <summary>
/// DataTable导出到Excel的MemoryStream
/// </summary>
/// <param name="dtSource">源DataTable</param>
/// <param name="strHeaderText">表头文本</param>
/// <Author>柳永法 http://www.yongfa365.com/ 2010-5-8 22:21:41</Author>
publicstatic MemoryStream Export(DataTable dtSource, string strHeaderText)
{
HSSFWorkbook workbook = new HSSFWorkbook();
HSSFSheet sheet = workbook.CreateSheet();

#region 右击文件 属性信息
{
DocumentSummaryInformation dsi = PropertySetFactory.CreateDocumentSummaryInformation();
dsi.Company = "http://www.yongfa365.com/";
workbook.DocumentSummaryInformation = dsi;

SummaryInformation si = PropertySetFactory.CreateSummaryInformation();
si.Author = "柳永法"; //填加xls文件作者信息
si.ApplicationName = "NPOI测试程序"; //填加xls文件创建程序信息
si.LastAuthor = "柳永法2"; //填加xls文件最后保存者信息
si.Comments = "说明信息"; //填加xls文件作者信息
si.Title = "NPOI测试"; //填加xls文件标题信息
si.Subject = "NPOI测试Demo";//填加文件主题信息
si.CreateDateTime = DateTime.Now;
workbook.SummaryInformation = si;
}
#endregion

HSSFCellStyle dateStyle = workbook.CreateCellStyle();
HSSFDataFormat format = workbook.CreateDataFormat();
dateStyle.DataFormat = format.GetFormat("yyyy-mm-dd");

//取得列宽
int[] arrColWidth = newint[dtSource.Columns.Count];
foreach (DataColumn item in dtSource.Columns)
{
arrColWidth[item.Ordinal] = Encoding.GetEncoding(936).GetBytes(item.ColumnName.ToString()).Length;
}
for (int i = 0; i < dtSource.Rows.Count; i++)
{
for (int j = 0; j < dtSource.Columns.Count; j++)
{
int intTemp = Encoding.GetEncoding(936).GetBytes(dtSource.Rows[i][j].ToString()).Length;
if (intTemp > arrColWidth[j])
{
arrColWidth[j] = intTemp;
}
}
}



int rowIndex = 0;

foreach (DataRow row in dtSource.Rows)
{
#region 新建表，填充表头，填充列头，样式
if (rowIndex == 65535 || rowIndex == 0)
{
if (rowIndex != 0)
{
sheet = workbook.CreateSheet();
}

#region 表头及样式
{
HSSFRow headerRow = sheet.CreateRow(0);
headerRow.HeightInPoints = 25;
headerRow.CreateCell(0).SetCellValue(strHeaderText);

HSSFCellStyle headStyle = workbook.CreateCellStyle();
headStyle.Alignment = CellHorizontalAlignment.CENTER;
HSSFFont font = workbook.CreateFont();
font.FontHeightInPoints = 20;
font.Boldweight = 700;
headStyle.SetFont(font);

headerRow.GetCell(0).CellStyle = headStyle;

sheet.AddMergedRegion(new Region(0, 0, 0, dtSource.Columns.Count - 1));
headerRow.Dispose();
}
#endregion


#region 列头及样式
{
HSSFRow headerRow = sheet.CreateRow(1);


HSSFCellStyle headStyle = workbook.CreateCellStyle();
headStyle.Alignment = CellHorizontalAlignment.CENTER;
HSSFFont font = workbook.CreateFont();
font.FontHeightInPoints = 10;
font.Boldweight = 700;
headStyle.SetFont(font);


foreach (DataColumn column in dtSource.Columns)
{
headerRow.CreateCell(column.Ordinal).SetCellValue(column.ColumnName);
headerRow.GetCell(column.Ordinal).CellStyle = headStyle;

//设置列宽
sheet.SetColumnWidth(column.Ordinal, (arrColWidth[column.Ordinal] + 1) * 256);

}
headerRow.Dispose();
}
#endregion

rowIndex = 2;
}
#endregion


#region 填充内容
HSSFRow dataRow = sheet.CreateRow(rowIndex);
foreach (DataColumn column in dtSource.Columns)
{
HSSFCell newCell = dataRow.CreateCell(column.Ordinal);

string drValue = row[column].ToString();

switch (column.DataType.ToString())
{
case"System.String"://字符串类型
newCell.SetCellValue(drValue);
break;
case"System.DateTime"://日期类型
DateTime dateV;
DateTime.TryParse(drValue, out dateV);
newCell.SetCellValue(dateV);

newCell.CellStyle = dateStyle;//格式化显示
break;
case"System.Boolean"://布尔型
bool boolV = false;
bool.TryParse(drValue, out boolV);
newCell.SetCellValue(boolV);
break;
case"System.Int16"://整型
case"System.Int32":
case"System.Int64":
case"System.Byte":
int intV = 0;
int.TryParse(drValue, out intV);
newCell.SetCellValue(intV);
break;
case"System.Decimal"://浮点型
case"System.Double":
double doubV = 0;
double.TryParse(drValue, out doubV);
newCell.SetCellValue(doubV);
break;
case"System.DBNull"://空值处理
newCell.SetCellValue("");
break;
default:
newCell.SetCellValue("");
break;
}

}
#endregion

rowIndex++;
}


using (MemoryStream ms = new MemoryStream())
{
workbook.Write(ms);
ms.Flush();
ms.Position = 0;

sheet.Dispose();
//workbook.Dispose();//一般只用写这一个就OK了，他会遍历并释放所有资源，但当前版本有问题所以只释放sheet
return ms;
}

}


/// <summary>
/// 用于Web导出
/// </summary>
/// <param name="dtSource">源DataTable</param>
/// <param name="strHeaderText">表头文本</param>
/// <param name="strFileName">文件名</param>
/// <Author>柳永法 http://www.yongfa365.com/ 2010-5-8 22:21:41</Author>
publicstaticvoid ExportByWeb(DataTable dtSource, string strHeaderText, string strFileName)
{

HttpContext curContext = HttpContext.Current;

// 设置编码和附件格式
curContext.Response.ContentType = "application/vnd.ms-excel";
curContext.Response.ContentEncoding = Encoding.UTF8;
curContext.Response.Charset = "";
curContext.Response.AppendHeader("Content-Disposition",
"attachment;filename=" + HttpUtility.UrlEncode(strFileName, Encoding.UTF8));

curContext.Response.BinaryWrite(Export(dtSource, strHeaderText).GetBuffer());
curContext.Response.End();

}


/// <summary>读取excel
/// 默认第一行为标头
/// </summary>
/// <param name="strFileName">excel文档路径</param>
/// <returns></returns>
publicstatic DataTable Import(string strFileName)
{
DataTable dt = new DataTable();

HSSFWorkbook hssfworkbook;
using (FileStream file = new FileStream(strFileName, FileMode.Open, FileAccess.Read))
{
hssfworkbook = new HSSFWorkbook(file);
}
HSSFSheet sheet = hssfworkbook.GetSheetAt(0);
System.Collections.IEnumerator rows = sheet.GetRowEnumerator();

HSSFRow headerRow = sheet.GetRow(0);
int cellCount = headerRow.LastCellNum;

for (int j = 0; j < cellCount; j++)
{
HSSFCell cell = headerRow.GetCell(j);
dt.Columns.Add(cell.ToString());
}

for (int i = (sheet.FirstRowNum + 1); i <= sheet.LastRowNum; i++)
{
HSSFRow row = sheet.GetRow(i);
DataRow dataRow = dt.NewRow();

for (int j = row.FirstCellNum; j < cellCount; j++)
{
if (row.GetCell(j) != null)
dataRow[j] = row.GetCell(j).ToString();
}

dt.Rows.Add(dataRow);
}
return dt;
}

}

using System;
using System.Collections.Generic;
using System.Data;
using System.IO;
using System.Text;
using System.Web;
using NPOI;
using NPOI.HPSF;
using NPOI.HSSF;
using NPOI.HSSF.UserModel;
using NPOI.HSSF.Util;
using NPOI.POIFS;
using NPOI.Util;


public class ExcelHelper
{
    /// <summary>
    /// DataTable导出到Excel文件
    /// </summary>
    /// <param name="dtSource">源DataTable</param>
    /// <param name="strHeaderText">表头文本</param>
    /// <param name="strFileName">保存位置</param>
    /// <Author>柳永法 http://www.yongfa365.com/ 2010-5-8 22:21:41</Author>
    public static void Export(DataTable dtSource, string strHeaderText, string strFileName)
    {
        using (MemoryStream ms = Export(dtSource, strHeaderText))
        {
            using (FileStream fs = new FileStream(strFileName, FileMode.Create, FileAccess.Write))
            {
                byte[] data = ms.ToArray();
                fs.Write(data, 0, data.Length);
                fs.Flush();
            }
        }
    }

    /// <summary>
    /// DataTable导出到Excel的MemoryStream
    /// </summary>
    /// <param name="dtSource">源DataTable</param>
    /// <param name="strHeaderText">表头文本</param>
    /// <Author>柳永法 http://www.yongfa365.com/ 2010-5-8 22:21:41</Author>
    public static MemoryStream Export(DataTable dtSource, string strHeaderText)
    {
        HSSFWorkbook workbook = new HSSFWorkbook();
        HSSFSheet sheet = workbook.CreateSheet();

        #region 右击文件 属性信息
        {
            DocumentSummaryInformation dsi = PropertySetFactory.CreateDocumentSummaryInformation();
            dsi.Company = "http://www.yongfa365.com/";
            workbook.DocumentSummaryInformation = dsi;

            SummaryInformation si = PropertySetFactory.CreateSummaryInformation();
            si.Author = "柳永法"; //填加xls文件作者信息
            si.ApplicationName = "NPOI测试程序"; //填加xls文件创建程序信息
            si.LastAuthor = "柳永法2"; //填加xls文件最后保存者信息
            si.Comments = "说明信息"; //填加xls文件作者信息
            si.Title = "NPOI测试"; //填加xls文件标题信息
            si.Subject = "NPOI测试Demo";//填加文件主题信息
            si.CreateDateTime = DateTime.Now;
            workbook.SummaryInformation = si;
        }
        #endregion

        HSSFCellStyle dateStyle = workbook.CreateCellStyle();
        HSSFDataFormat format = workbook.CreateDataFormat();
        dateStyle.DataFormat = format.GetFormat("yyyy-mm-dd");

        //取得列宽
        int[] arrColWidth = new int[dtSource.Columns.Count];
        foreach (DataColumn item in dtSource.Columns)
        {
            arrColWidth[item.Ordinal] = Encoding.GetEncoding(936).GetBytes(item.ColumnName.ToString()).Length;
        }
        for (int i = 0; i < dtSource.Rows.Count; i++)
        {
            for (int j = 0; j < dtSource.Columns.Count; j++)
            {
                int intTemp = Encoding.GetEncoding(936).GetBytes(dtSource.Rows[i][j].ToString()).Length;
                if (intTemp > arrColWidth[j])
                {
                    arrColWidth[j] = intTemp;
                }
            }
        }



        int rowIndex = 0;

        foreach (DataRow row in dtSource.Rows)
        {
            #region 新建表，填充表头，填充列头，样式
            if (rowIndex == 65535 || rowIndex == 0)
            {
                if (rowIndex != 0)
                {
                    sheet = workbook.CreateSheet();
                }

                #region 表头及样式
                {
                    HSSFRow headerRow = sheet.CreateRow(0);
                    headerRow.HeightInPoints = 25;
                    headerRow.CreateCell(0).SetCellValue(strHeaderText);

                    HSSFCellStyle headStyle = workbook.CreateCellStyle();
                    headStyle.Alignment = CellHorizontalAlignment.CENTER;
                    HSSFFont font = workbook.CreateFont();
                    font.FontHeightInPoints = 20;
                    font.Boldweight = 700;
                    headStyle.SetFont(font);

                    headerRow.GetCell(0).CellStyle = headStyle;

                    sheet.AddMergedRegion(new Region(0, 0, 0, dtSource.Columns.Count - 1));
                    headerRow.Dispose();
                }
                #endregion


                #region 列头及样式
                {
                    HSSFRow headerRow = sheet.CreateRow(1);


                    HSSFCellStyle headStyle = workbook.CreateCellStyle();
                    headStyle.Alignment = CellHorizontalAlignment.CENTER;
                    HSSFFont font = workbook.CreateFont();
                    font.FontHeightInPoints = 10;
                    font.Boldweight = 700;
                    headStyle.SetFont(font);


                    foreach (DataColumn column in dtSource.Columns)
                    {
                        headerRow.CreateCell(column.Ordinal).SetCellValue(column.ColumnName);
                        headerRow.GetCell(column.Ordinal).CellStyle = headStyle;

                        //设置列宽
                        sheet.SetColumnWidth(column.Ordinal, (arrColWidth[column.Ordinal] + 1) * 256);

                    }
                    headerRow.Dispose();
                }
                #endregion

                rowIndex = 2;
            }
            #endregion


            #region 填充内容
            HSSFRow dataRow = sheet.CreateRow(rowIndex);
            foreach (DataColumn column in dtSource.Columns)
            {
                HSSFCell newCell = dataRow.CreateCell(column.Ordinal);

                string drValue = row[column].ToString();

                switch (column.DataType.ToString())
                {
                    case "System.String"://字符串类型
                        newCell.SetCellValue(drValue);
                        break;
                    case "System.DateTime"://日期类型
                        DateTime dateV;
                        DateTime.TryParse(drValue, out dateV);
                        newCell.SetCellValue(dateV);

                        newCell.CellStyle = dateStyle;//格式化显示
                        break;
                    case "System.Boolean"://布尔型
                        bool boolV = false;
                        bool.TryParse(drValue, out boolV);
                        newCell.SetCellValue(boolV);
                        break;
                    case "System.Int16"://整型
                    case "System.Int32":
                    case "System.Int64":
                    case "System.Byte":
                        int intV = 0;
                        int.TryParse(drValue, out intV);
                        newCell.SetCellValue(intV);
                        break;
                    case "System.Decimal"://浮点型
                    case "System.Double":
                        double doubV = 0;
                        double.TryParse(drValue, out doubV);
                        newCell.SetCellValue(doubV);
                        break;
                    case "System.DBNull"://空值处理
                        newCell.SetCellValue("");
                        break;
                    default:
                        newCell.SetCellValue("");
                        break;
                }

            }
            #endregion

            rowIndex++;
        }


        using (MemoryStream ms = new MemoryStream())
        {
            workbook.Write(ms);
            ms.Flush();
            ms.Position = 0;

            sheet.Dispose();
           //workbook.Dispose();//一般只用写这一个就OK了，他会遍历并释放所有资源，但当前版本有问题所以只释放sheet
            return ms;
        }

    }


    /// <summary>
    /// 用于Web导出
    /// </summary>
    /// <param name="dtSource">源DataTable</param>
    /// <param name="strHeaderText">表头文本</param>
    /// <param name="strFileName">文件名</param>
    /// <Author>柳永法 http://www.yongfa365.com/ 2010-5-8 22:21:41</Author>
    public static void ExportByWeb(DataTable dtSource, string strHeaderText, string strFileName)
    {

        HttpContext curContext = HttpContext.Current;

        // 设置编码和附件格式
        curContext.Response.ContentType = "application/vnd.ms-excel";
        curContext.Response.ContentEncoding = Encoding.UTF8;
        curContext.Response.Charset = "";
        curContext.Response.AppendHeader("Content-Disposition", 
            "attachment;filename=" + HttpUtility.UrlEncode(strFileName, Encoding.UTF8));

        curContext.Response.BinaryWrite(Export(dtSource, strHeaderText).GetBuffer());
        curContext.Response.End();

    }


    /// <summary>读取excel
    /// 默认第一行为标头
    /// </summary>
    /// <param name="strFileName">excel文档路径</param>
    /// <returns></returns>
    public static DataTable Import(string strFileName)
    {
        DataTable dt = new DataTable();

        HSSFWorkbook hssfworkbook;
        using (FileStream file = new FileStream(strFileName, FileMode.Open, FileAccess.Read))
        {
            hssfworkbook = new HSSFWorkbook(file);
        }
        HSSFSheet sheet = hssfworkbook.GetSheetAt(0);
        System.Collections.IEnumerator rows = sheet.GetRowEnumerator();

        HSSFRow headerRow = sheet.GetRow(0);
        int cellCount = headerRow.LastCellNum;

        for (int j = 0; j < cellCount; j++)
        {
            HSSFCell cell = headerRow.GetCell(j);
            dt.Columns.Add(cell.ToString());
        }

        for (int i = (sheet.FirstRowNum + 1); i <= sheet.LastRowNum; i++)
        {
            HSSFRow row = sheet.GetRow(i);
            DataRow dataRow = dt.NewRow();

            for (int j = row.FirstCellNum; j < cellCount; j++)
            {
                if (row.GetCell(j) != null)
                    dataRow[j] = row.GetCell(j).ToString();
            }

            dt.Rows.Add(dataRow);
        }
        return dt;
    }

}

Aspose.Cells 使用整理 

以上

这两天用Aspose.Cells构建一个Excel报表,感觉这个组件还比较好用.记录一下常用的使用知识:这两天用Aspose.Cells构建一个Excel报表,感觉这个组件还比较好用.记录一下常用的使用知识:

1.创建Workbook和Worksheet

workbook&worksheet1
Workbook wb = new Workbook();
wb.Worksheets.Clear();
wb.Worksheets.Add("New Worksheet1");//New Worksheet1是Worksheet的name
Worksheet ws = wb.Worksheets[0];
如果直接用下边两句则直接使用默认的第一个Worksheet:

workbook&worksheet2
Workbook wb = new Workbook();
Worksheet ws = wb.Worksheets[0];
2.给Cell赋值设置背景颜色并加背景色:

cell1
Cell cell = ws.Cells[0, 0];
cell.PutValue("填充"); //必须用PutValue方法赋值
cell.Style.ForegroundColor = Color.Yellow;
cell.Style.Pattern = BackgroundType.Solid;
cell.Style.Font.Size = 10;
cell.Style.Font.Color = Color.Blue;
自定义格式:

cell2
cell.Style.Custom = "ddd, dd mmmm 'yy";
旋转字体:

cell3
cell.Style.Rotation = 90;
3.设置Range并赋值加Style

range1
int styleIndex = wb.Styles.Add();
Style style = wb.Styles[styleIndex];
style.ForegroundColor = Color.Yellow;
style.Pattern = BackgroundType.Solid;
style.Font.Size = 10;

//从Cells[0,0]开始创建一个2行3列的Range
Range range = ws.Cells.CreateRange(0, 0, 2, 3);
Cell cell = range[0, 0];
cell.Style.Font = 9;
range.Style = style;
range.Merge();
注意Range不能直接设置Style.必须先定义style再将style赋给Style.其他设置和Cell基本一致.Range的Style会覆盖Cell定义的Style.另外必须先赋值再传Style.否则可能不生效.

4.使用Formula:

formula1
ws.Cells[0,0].PutValue(1);
ws.Cells[1,0].PutValue(20);
ws.Cells[2,0].Formula="SUM(A1:B1)";
wb.CalculateFormula(true);
Save Excel文件的时候必须调用CalculateFormula方法计算结果.

5.插入图片:

pictures1
string imageUrl = System.Web.HttpContext.Current.Server.MapPath("~/images/log_topleft.gif");
ws.Pictures.Add(10, 10, imageUrl);

6.使用Validations:

validations1
Cells cells = ws.Cells;

cells[12, 0].PutValue("Please enter a number other than 0 to 10 in B1 to activate data validation:");
cells[12, 0].Style.IsTextWrapped = true;

cells[12, 1].PutValue(5);
Validations validations = totalSheet.Validations;

Validation validation = validations[validations.Add()];
//Set the data validation type
validation.Type = ValidationType.WholeNumber;
//Set the operator for the data validation
validation.Operator = OperatorType.Between;
//Set the value or expression associated with the data validation
validation.Formula1 = "0";
//the value or expression associated with the second part of the data validation
validation.Formula2 = "10";

validation.ShowError = true;
//Set the validation alert style
validation.AlertStyle = ValidationAlertType.Information;
//Set the title of the data-validation error dialog box
validation.ErrorTitle = "Error";
//Set the data validation error message
validation.ErrorMessage = " Enter value between 0 to 10";
//Set the data validation input message
validation.InputMessage = "Data Validation using Condition for Numbers";
validation.IgnoreBlank = true;
validation.ShowInput = true;
validation.ShowError = true;

//设置Validations的区域，因为现在要Validations的位置是12,1，所以下面设置对应的也要是12,1
CellArea cellArea;
cellArea.StartRow = 12;
cellArea.EndRow = 12;
cellArea.StartColumn = 1;
cellArea.EndColumn = 1;
validation.AreaList.Add(cellArea);

/*
要注意 的地方Validations 也是和Range的Style一样，要新增的，否则不生效
*/

相关源码及测试用例下载地址：

http://download.csdn.net/source/2330821

参考地址：

NPOI导出Excel表功能实现(多个工作簿)：http://www.cnblogs.com/zhengjuzhuan/archive/2010/02/01/1661103.html
在 Server 端存取 Excel 檔案的利器：NPOI Library：http://msdn.microsoft.com/zh-tw/ee818993.aspx
ASP.NET使用NPOI类库导出Excel：http://www.cnblogs.com/niunan/archive/2010/03/30/1700706.html

总结：

　　通过以上分析，我们不难发现，用NPOI或MyXls代替是Excel是很明智的，在发文前，我看到NPOI及MyXls仍然在活跃的更新中。在使用过程中发现这两个组件极相似，以前看过文章说他们使用的内核是一样的。还有NPOI是国人开发的，且有相关中文文档，在很多地方有相关引用，下载量也很大。并且它支持Excel，看到MyXls相关问题基本上没人回答，所以推荐使用NPOI。MyXls可以直接Cell.Font.Bold操作，而NPOI得使用CellType多少感觉有点麻烦。