NPOI、MyXls、Aspose.Cells 導入導出Excel

本文轉載自查看原文 2012-03-21 16:51 4337 .net

Excel導入及導出問題產生：

　　從接觸.net到現在一直在維護一個DataTable導s出到Excel的類，時不時還會維護一個導入類。以下是時不時就會出現的問題：

導出問題：

　　如果是asp.net，你得在服務器端裝Office，幾百M呢，還得及時更新它，以防漏洞，還得設定權限允許ASP.net訪問COM+，聽說如果導出過程中出問題可能導致服務器宕機。

　　Excel會把只包含數字的列進行類型轉換，本來是文本型的，它非要把你轉成數值型的，像身份證后三位變成000，編號000123會變成123，夠智能吧，夠郁悶吧。不過這些都還是可以變通解決的，在他們前邊加上一個字母，讓他們不只包含數字。

　　導出時，如果你的字段內容以"-"或"="開頭，Excel好像把它當成了公式什么的，接下來就出錯，提示：類似，保存到Sheet1的問題

導入問題：

　　Excel會根據你的 Excel文件前8行分析數據類型，如果正好你前8行某一列只是數字，那它會認為你這一列就是數值型的，然后，身份證，手機，編號都轉吧變成類似這樣的1.42702E+17格式，日期列變成包含日期和數字的，亂的很，可以通過改注冊表讓Excel分析整個表，但如果整列都是數字，那這個問題還是解決不了。

以上問題，一般人初次做時肯定得上網查查吧，一個問題接着另一個問題，查到你郁郁而死，還有很多問題沒解決，最終感覺已經解決的不錯了，但還不能保證某一天還會出個什么問題。

使用第三方開源組件導入及導出Excel的解決方案：

　　NPOI || MyXls || Aspose.Cells == 研究幾年Excel。

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

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

Aspose.Cells是個商業軟件，下載地址：http://www.evget.com/zh-CN/product/563/feature_en.aspx

下面來兩個簡單入門例子：
MyXls 快速入門例子:

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/// <summary>
/// MyXls簡單Demo，快速入門代碼
/// </summary>
/// <param name="dtSource"></param>
/// <param name="strFileName"></param>
/// <remarks>MyXls認為Excel的第一個單元格是：(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");
//填充表頭
foreach (DataColumn col in dtSource.Columns)
{
sheet.Cells.Add(1, col.Ordinal + 1, col.ColumnName);
}
//填充內容
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簡單Demo，快速入門代碼
/// </summary>
/// <param name="dtSource"></param>
/// <param name="strFileName"></param>
/// <remarks>MyXls認為Excel的第一個單元格是：(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");

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

    //填充內容
    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 快速入門例子:

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/// <summary>
/// NPOI簡單Demo，快速入門代碼
/// </summary>
/// <param name="dtSource"></param>
/// <param name="strFileName"></param>
/// <remarks>NPOI認為Excel的第一個單元格是：(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();
//填充表頭
HSSFRow dataRow = sheet.CreateRow(0);
foreach (DataColumn column in dtSource.Columns)
{
dataRow.CreateCell(column.Ordinal).SetCellValue(column.ColumnName);
}
//填充內容
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簡單Demo，快速入門代碼
/// </summary>
/// <param name="dtSource"></param>
/// <param name="strFileName"></param>
/// <remarks>NPOI認為Excel的第一個單元格是：(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();

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


    //填充內容
    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();
}

接下來是柳永法(yongfa365)'Blog封裝的可以用在實際項目中的類，實現的功能有（僅NPOI）：

支持web及winform從DataTable導出到Excel。
生成速度很快。
准確判斷數據類型，不會出現身份證轉數值等上面提到的一系列問題。
如果單頁條數大於65535時會新建工作表。
列寬自適應。
支持讀取Excel。
調用方便，只一調用一個靜態類就OK了。

因為測試期間發現MyXls導出速度要比NPOI慢3倍，而NPOI既能滿足我們的導出需求，又能很好的滿足我們的導入需求，所以只針對NPOI進行全方位功能實現及優化。

MyXls導出相關類：

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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文件創建程序信息
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文件標題信息
xls.SummaryInformation.Subject = "Subject";//填加文件主題信息
xls.DocumentSummaryInformation.Company = "company";//填加文件公司信息
Worksheet sheet = xls.Workbook.Worksheets.Add("Sheet1");//狀態欄標題名稱
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; //字體
cell.Font.Bold = true; //字體為粗體
}
#region 填充內容
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"://字符串類型
cells.Add(rowIndex, colIndex, drValue);
break;
case"System.DateTime"://日期類型
DateTime dateV;
DateTime.TryParse(drValue, out dateV);
cells.Add(rowIndex, colIndex, dateV, dateStyle);
break;
case"System.Boolean"://布爾型
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"://浮點型
case"System.Double":
double doubV = 0;
double.TryParse(drValue, out doubV);
cells.Add(rowIndex, colIndex, doubV);
break;
case"System.DBNull"://空值處理
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文件創建程序信息
        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文件標題信息
        xls.SummaryInformation.Subject = "Subject";//填加文件主題信息
        xls.DocumentSummaryInformation.Company = "company";//填加文件公司信息


        Worksheet sheet = xls.Workbook.Worksheets.Add("Sheet1");//狀態欄標題名稱
        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; //字體
            cell.Font.Bold = true;  //字體為粗體  

        }
        #region 填充內容
        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"://字符串類型
                        cells.Add(rowIndex, colIndex, drValue);
                        break;
                    case "System.DateTime"://日期類型
                        DateTime dateV;
                        DateTime.TryParse(drValue, out dateV);
                        cells.Add(rowIndex, colIndex, dateV, dateStyle);
                        break;
                    case "System.Boolean"://布爾型
                        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"://浮點型
                    case "System.Double":
                        double doubV = 0;
                        double.TryParse(drValue, out doubV);
                        cells.Add(rowIndex, colIndex, doubV);
                        break;
                    case "System.DBNull"://空值處理
                        cells.Add(rowIndex, colIndex, null);
                        break;
                    default:
                        cells.Add(rowIndex, colIndex, null);
                        break;
                }
            }
        }

        #endregion

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

NPOI導入導出相關類：

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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導出到Excel文件
/// </summary>
/// <param name="dtSource">源DataTable</param>
/// <param name="strHeaderText">表頭文本</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導出到Excel的MemoryStream
/// </summary>
/// <param name="dtSource">源DataTable</param>
/// <param name="strHeaderText">表頭文本</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 右擊文件屬性信息
{
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測試程序"; //填加xls文件創建程序信息
si.LastAuthor = "柳永法2"; //填加xls文件最后保存者信息
si.Comments = "說明信息"; //填加xls文件作者信息
si.Title = "NPOI測試"; //填加xls文件標題信息
si.Subject = "NPOI測試Demo";//填加文件主題信息
si.CreateDateTime = DateTime.Now;
workbook.SummaryInformation = si;
}
#endregion
HSSFCellStyle dateStyle = workbook.CreateCellStyle();
HSSFDataFormat format = workbook.CreateDataFormat();
dateStyle.DataFormat = format.GetFormat("yyyy-mm-dd");
//取得列寬
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，填充表頭，填充列頭，樣式
if (rowIndex == 65535 || rowIndex == 0)
{
if (rowIndex != 0)
{
sheet = workbook.CreateSheet();
}
#region 表頭及樣式
{
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 列頭及樣式
{
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;
//設置列寬
sheet.SetColumnWidth(column.Ordinal, (arrColWidth[column.Ordinal] + 1) * 256);
}
headerRow.Dispose();
}
#endregion
rowIndex = 2;
}
#endregion
#region 填充內容
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"://字符串類型
newCell.SetCellValue(drValue);
break;
case"System.DateTime"://日期類型
DateTime dateV;
DateTime.TryParse(drValue, out dateV);
newCell.SetCellValue(dateV);
newCell.CellStyle = dateStyle;//格式化顯示
break;
case"System.Boolean"://布爾型
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"://浮點型
case"System.Double":
double doubV = 0;
double.TryParse(drValue, out doubV);
newCell.SetCellValue(doubV);
break;
case"System.DBNull"://空值處理
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();//一般只用寫這一個就OK了，他會遍歷並釋放所有資源，但當前版本有問題所以只釋放sheet
return ms;
}
}
/// <summary>
/// 用於Web導出
/// </summary>
/// <param name="dtSource">源DataTable</param>
/// <param name="strHeaderText">表頭文本</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;
// 設置編碼和附件格式
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>讀取excel
/// 默認第一行為標頭
/// </summary>
/// <param name="strFileName">excel文檔路徑</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導出到Excel文件
    /// </summary>
    /// <param name="dtSource">源DataTable</param>
    /// <param name="strHeaderText">表頭文本</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導出到Excel的MemoryStream
    /// </summary>
    /// <param name="dtSource">源DataTable</param>
    /// <param name="strHeaderText">表頭文本</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 右擊文件 屬性信息
        {
            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測試程序"; //填加xls文件創建程序信息
            si.LastAuthor = "柳永法2"; //填加xls文件最后保存者信息
            si.Comments = "說明信息"; //填加xls文件作者信息
            si.Title = "NPOI測試"; //填加xls文件標題信息
            si.Subject = "NPOI測試Demo";//填加文件主題信息
            si.CreateDateTime = DateTime.Now;
            workbook.SummaryInformation = si;
        }
        #endregion

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

        //取得列寬
        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，填充表頭，填充列頭，樣式
            if (rowIndex == 65535 || rowIndex == 0)
            {
                if (rowIndex != 0)
                {
                    sheet = workbook.CreateSheet();
                }

                #region 表頭及樣式
                {
                    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 列頭及樣式
                {
                    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;

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

                    }
                    headerRow.Dispose();
                }
                #endregion

                rowIndex = 2;
            }
            #endregion


            #region 填充內容
            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"://字符串類型
                        newCell.SetCellValue(drValue);
                        break;
                    case "System.DateTime"://日期類型
                        DateTime dateV;
                        DateTime.TryParse(drValue, out dateV);
                        newCell.SetCellValue(dateV);

                        newCell.CellStyle = dateStyle;//格式化顯示
                        break;
                    case "System.Boolean"://布爾型
                        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"://浮點型
                    case "System.Double":
                        double doubV = 0;
                        double.TryParse(drValue, out doubV);
                        newCell.SetCellValue(doubV);
                        break;
                    case "System.DBNull"://空值處理
                        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();//一般只用寫這一個就OK了，他會遍歷並釋放所有資源，但當前版本有問題所以只釋放sheet
            return ms;
        }

    }


    /// <summary>
    /// 用於Web導出
    /// </summary>
    /// <param name="dtSource">源DataTable</param>
    /// <param name="strHeaderText">表頭文本</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;

        // 設置編碼和附件格式
        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>讀取excel
    /// 默認第一行為標頭
    /// </summary>
    /// <param name="strFileName">excel文檔路徑</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

這兩天用Aspose.Cells構建一個Excel報表,感覺這個組件還比較好用.記錄一下常用的使用知識:這兩天用Aspose.Cells構建一個Excel報表,感覺這個組件還比較好用.記錄一下常用的使用知識:

1.創建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];
如果直接用下邊兩句則直接使用默認的第一個Worksheet:

workbook&worksheet2
Workbook wb = new Workbook();
Worksheet ws = wb.Worksheets[0];
2.給Cell賦值設置背景顏色並加背景色:

cell1
Cell cell = ws.Cells[0, 0];
cell.PutValue("填充"); //必須用PutValue方法賦值
cell.Style.ForegroundColor = Color.Yellow;
cell.Style.Pattern = BackgroundType.Solid;
cell.Style.Font.Size = 10;
cell.Style.Font.Color = Color.Blue;
自定義格式:

cell2
cell.Style.Custom = "ddd, dd mmmm 'yy";
旋轉字體:

cell3
cell.Style.Rotation = 90;
3.設置Range並賦值加Style

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

//從Cells[0,0]開始創建一個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不能直接設置Style.必須先定義style再將style賦給Style.其他設置和Cell基本一致.Range的Style會覆蓋Cell定義的Style.另外必須先賦值再傳Style.否則可能不生效.

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文件的時候必須調用CalculateFormula方法計算結果.

5.插入圖片:

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;

//設置Validations的區域，因為現在要Validations的位置是12,1，所以下面設置對應的也要是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一樣，要新增的，否則不生效
*/

參考地址：

NPOI導出Excel表功能實現(多個工作簿)：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類庫導出Excel：http://www.cnblogs.com/niunan/archive/2010/03/30/1700706.html

總結：

　　通過以上分析，我們不難發現，用NPOI或MyXls代替是Excel是很明智的，在發文前，我看到NPOI及MyXls仍然在活躍的更新中。在使用過程中發現這兩個組件極相似，以前看過文章說他們使用的內核是一樣的。還有NPOI是國人開發的，且有相關中文文檔，在很多地方有相關引用，下載量也很大。並且它支持Excel，看到MyXls相關問題基本上沒人回答，所以推薦使用NPOI。MyXls可以直接Cell.Font.Bold操作，而NPOI得使用CellType多少感覺有點麻煩。

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