using System.Data;
using System.IO;
using System.Text;
using System.Web;
using NPOI.SS.UserModel;
using NPOI.HSSF.UserModel;
namespace AIMSCommon
{
public class ExcelRender
{
/// <summary>
/// 根据Excel列类型获取列的值
/// </summary>
/// <param name="cell">Excel列</param>
/// <returns></returns>
private static string GetCellValue(ICell cell)
{
if (cell == null)
return string.Empty;
switch (cell.CellType)
{
case CellType.BLANK:
return string.Empty;
case CellType.BOOLEAN:
return cell.BooleanCellValue.ToString();
case CellType.ERROR:
return cell.ErrorCellValue.ToString();
case CellType.NUMERIC:
case CellType.Unknown:
default:
return cell.ToString();
case CellType.STRING:
return cell.StringCellValue;
case CellType.FORMULA:
try
{
HSSFFormulaEvaluator e = new HSSFFormulaEvaluator(cell.Sheet.Workbook);
e.EvaluateInCell(cell);
return cell.ToString();
}
catch
{
return cell.NumericCellValue.ToString();
}
}
}
/// <summary>
/// 自动设置Excel列宽
/// </summary>
/// <param name="sheet">Excel表</param>
private static void AutoSizeColumns(ISheet sheet)
{
if (sheet.PhysicalNumberOfRows > 0)
{
IRow headerRow = sheet.GetRow(0);
for (int i = 0, l = headerRow.LastCellNum; i < l; i++)
{
sheet.AutoSizeColumn(i);
}
}
}
/// <summary>
/// 保存Excel文档流到文件
/// </summary>
/// <param name="ms">Excel文档流</param>
/// <param name="fileName">文件名</param>
private static void SaveToFile(MemoryStream ms, string fileName)
{
using (FileStream fs = new FileStream(fileName, FileMode.Create, FileAccess.Write))
{
byte[] data = ms.ToArray();
fs.Write(data, 0, data.Length);
fs.Flush();
data = null;
}
}
/// <summary>
/// 输出文件到浏览器
/// </summary>
/// <param name="ms">Excel文档流</param>
/// <param name="context">HTTP上下文</param>
/// <param name="fileName">文件名</param>
private static void RenderToBrowser(MemoryStream ms, HttpContext context, string fileName)
{
if (context.Request.Browser.Browser == "IE")
fileName = HttpUtility.UrlEncode(fileName);
context.Response.AddHeader("Content-Disposition", "attachment;fileName=" + fileName);
context.Response.BinaryWrite(ms.ToArray());
}
/// <summary>
/// DataTable转换成Excel文档流
/// </summary>
/// <param name="table"></param>
/// <returns></returns>
public static MemoryStream RenderToExcel(DataTable table)
{
MemoryStream ms = new MemoryStream();
using (table)
{
using (IWorkbook workbook = new HSSFWorkbook())
{
using (ISheet sheet = workbook.CreateSheet())
{
IRow headerRow = sheet.CreateRow(0);
foreach (DataColumn column in table.Columns)
headerRow.CreateCell(column.Ordinal).SetCellValue(column.Caption);
int rowIndex = 1;
foreach (DataRow row in table.Rows)
{
IRow dataRow = sheet.CreateRow(rowIndex);
foreach (DataColumn column in table.Columns)
{
dataRow.CreateCell(column.Ordinal).SetCellValue(row[column].ToString());
}
rowIndex++;
}
AutoSizeColumns(sheet);
workbook.Write(ms);
ms.Flush();
ms.Position = 0;
}
}
}
return ms;
}
/// <summary>
/// DataTable转换成Excel文档流，并保存到文件
/// </summary>
/// <param name="table"></param>
/// <param name="fileName">保存的路径</param>
public static void RenderToExcel(DataTable table, string fileName)
{
using (MemoryStream ms = RenderToExcel(table))
{
SaveToFile(ms, fileName);
}
}
/// <summary>
/// DataTable转换成Excel文档流，并输出到客户端
/// </summary>
/// <param name="table"></param>
/// <param name="response"></param>
/// <param name="fileName">输出的文件名</param>
public static void RenderToExcel(DataTable table, HttpContext context, string fileName)
{
using (MemoryStream ms = RenderToExcel(table))
{
RenderToBrowser(ms, context, fileName);
}
}
/// <summary>
/// Excel文档流是否有数据
/// </summary>
/// <param name="excelFileStream">Excel文档流</param>
/// <returns></returns>
public static bool HasData(Stream excelFileStream)
{
return HasData(excelFileStream, 0);
}
/// <summary>
/// Excel文档流是否有数据
/// </summary>
/// <param name="excelFileStream">Excel文档流</param>
/// <param name="sheetIndex">表索引号，如第一个表为0</param>
/// <returns></returns>
public static bool HasData(Stream excelFileStream, int sheetIndex)
{
using (excelFileStream)
{
using (IWorkbook workbook = new HSSFWorkbook(excelFileStream))
{
if (workbook.NumberOfSheets > 0)
{
if (sheetIndex < workbook.NumberOfSheets)
{
using (ISheet sheet = workbook.GetSheetAt(sheetIndex))
{
return sheet.PhysicalNumberOfRows > 0;
}
}
}
}
}
return false;
}
/// <summary>
/// Excel文档流转换成DataTable
/// 第一行必须为标题行
/// </summary>
/// <param name="excelFileStream">Excel文档流</param>
/// <param name="sheetName">表名称</param>
/// <returns></returns>
public static DataTable RenderFromExcel(Stream excelFileStream, string sheetName)
{
return RenderFromExcel(excelFileStream, sheetName, 0);
}
/// <summary>
/// Excel文档流转换成DataTable
/// </summary>
/// <param name="excelFileStream">Excel文档流</param>
/// <param name="sheetName">表名称</param>
/// <param name="headerRowIndex">标题行索引号，如第一行为0</param>
/// <returns></returns>
public static DataTable RenderFromExcel(Stream excelFileStream, string sheetName, int headerRowIndex)
{
DataTable table = null;
using (excelFileStream)
{
using (IWorkbook workbook = new HSSFWorkbook(excelFileStream))
{
using (ISheet sheet = workbook.GetSheet(sheetName))
{
table = RenderFromExcel(sheet, headerRowIndex);
}
}
}
return table;
}
/// <summary>
/// Excel文档流转换成DataTable
/// 默认转换Excel的第一个表
/// 第一行必须为标题行
/// </summary>
/// <param name="excelFileStream">Excel文档流</param>
/// <returns></returns>
public static DataTable RenderFromExcel(Stream excelFileStream)
{
return RenderFromExcel(excelFileStream, 0, 0);
}
/// <summary>
/// Excel文档流转换成DataTable
/// 第一行必须为标题行
/// </summary>
/// <param name="excelFileStream">Excel文档流</param>
/// <param name="sheetIndex">表索引号，如第一个表为0</param>
/// <returns></returns>
public static DataTable RenderFromExcel(Stream excelFileStream, int sheetIndex)
{
return RenderFromExcel(excelFileStream, sheetIndex, 0);
}
/// <summary>
/// Excel文档流转换成DataTable
/// </summary>
/// <param name="excelFileStream">Excel文档流</param>
/// <param name="sheetIndex">表索引号，如第一个表为0</param>
/// <param name="headerRowIndex">标题行索引号，如第一行为0</param>
/// <returns></returns>
public static DataTable RenderFromExcel(Stream excelFileStream, int sheetIndex, int headerRowIndex)
{
DataTable table = null;
using (excelFileStream)
{
using (IWorkbook workbook = new HSSFWorkbook(excelFileStream))
{
using (ISheet sheet = workbook.GetSheetAt(sheetIndex))
{
table = RenderFromExcel(sheet, headerRowIndex);
}
}
}
return table;
}
/// <summary>
/// Excel表格转换成DataTable
/// </summary>
/// <param name="sheet">表格</param>
/// <param name="headerRowIndex">标题行索引号，如第一行为0</param>
/// <returns></returns>
private static DataTable RenderFromExcel(ISheet sheet, int headerRowIndex)
{
DataTable table = new DataTable();
IRow headerRow = sheet.GetRow(headerRowIndex);
int cellCount = headerRow.LastCellNum;//LastCellNum = PhysicalNumberOfCells
int rowCount = sheet.LastRowNum;//LastRowNum = PhysicalNumberOfRows - 1
//handling header.
for (int i = headerRow.FirstCellNum; i < cellCount; i++)
{
DataColumn column = new DataColumn(headerRow.GetCell(i).StringCellValue);
table.Columns.Add(column);
}
for (int i = (sheet.FirstRowNum + 1); i <= rowCount; i++)
{
IRow row = sheet.GetRow(i);
DataRow dataRow = table.NewRow();
if (row != null)
{
for (int j = row.FirstCellNum; j < cellCount; j++)
{
if (row.GetCell(j) != null)
dataRow[j] = GetCellValue(row.GetCell(j));
}
}
table.Rows.Add(dataRow);
}
return table;
}
}
}