读取csv格式时内容含有逗号的无法处理
using System;
using System.Data;
using System.IO;
using System.Web;
using NPOI;
using NPOI.HPSF;
using NPOI.HSSF;
using NPOI.HSSF.UserModel;
using NPOI.POIFS;
using NPOI.Util;
using System.Text;
using NPOI.SS.UserModel;
using NPOI.XSSF.UserModel;
namespace ProductBLL.download
{
public class ExcelHelper
{
#region NPOI读取导入的文件，将xlsx，xls文件的数据读取到DataTable中
/// <summary>
/// 将excel中的数据导入到DataTable中
/// </summary>
/// <param name="sheetName">文件路径</param>
///<param name="fileExtension">后缀名</param>
/// <param name="isFirstRowColumn">第一行是否是DataTable的列名</param>
/// <returns>返回的DataTable</returns>
public static DataTable ExcelToDataTable(string fileName, string fileExtension, bool isFirstRowColumn)
{
IWorkbook workbook = null;
FileStream fs = null;
ISheet sheet = null;
DataTable data = new DataTable();
int startRow = 0;
try
{
//把文件内容导入到工作薄当中，然后关闭文件
using (fs = new FileStream(fileName, FileMode.Open, FileAccess.Read))
{
//根据不同版本获取第一个工作表的数据
if (fileExtension == ".xls") // 2003版本
{
workbook = new HSSFWorkbook(fs);
// sheet = workbook.GetSheet("SheetName"); 可以根据Sheet工作表的名字来获取
sheet = workbook.GetSheetAt(0) as HSSFSheet;
}
else if (fileExtension == ".xlsx") // 2007版本
{
workbook = new XSSFWorkbook(fs);
sheet = workbook.GetSheetAt(0) as XSSFSheet;
}
}
if (sheet != null)
{
IRow firstRow = sheet.GetRow(0);
int cellCount = firstRow.LastCellNum; //一行最后一个cell的编号 即总的列数
#region 第一行是否是作为列名
if (isFirstRowColumn)
{
for (int i = firstRow.FirstCellNum; i < cellCount; ++i)
{
ICell cell = firstRow.GetCell(i);
if (cell != null)
{
string cellValue = cell.StringCellValue;
if (cellValue != null)
{
DataColumn column = new DataColumn(cellValue);
data.Columns.Add(column);
}
}
}
startRow = sheet.FirstRowNum + 1;
}
else
{
startRow = sheet.FirstRowNum;
}
#endregion
//最后一行的标号
int rowCount = sheet.LastRowNum;
#region 从第一行开始遍历数据保存到DataRow
for (int i = startRow; i <= rowCount; ++i)
{
IRow row = sheet.GetRow(i);
if (row == null) continue; //没有数据的行默认是null
DataRow dataRow = data.NewRow();
for (int j = row.FirstCellNum; j < cellCount; ++j)
{
if (row.GetCell(j) != null) //同理，没有数据的单元格都默认是null
dataRow[j] = row.GetCell(j).ToString();
}
data.Rows.Add(dataRow);
}
#endregion
}
return data;
}
catch (Exception ex)
{
Console.WriteLine("Exception: " + ex.Message);
return null;
}
}
#endregion
#region 读取导入的文件，将CSV文件的数据读取到DataTable中
/// <summary>
/// 将CSV文件的数据读取到DataTable中
/// </summary>
/// <param name="">文件地址</param>
/// <returns>返回读取了CSV数据的DataTable</returns>
public static DataTable OpenCSV(string fileName)
{
DataTable dt = new DataTable();
FileStream fs = new FileStream(fileName, System.IO.FileMode.Open, System.IO.FileAccess.Read);
StreamReader sr = new StreamReader(fs, System.Text.Encoding.Default);
try
{
//记录每次读取的一行记录
string strLine = "";
//记录每行记录中的各字段内容
string[] aryLine;
//标示列数
int columnCount = 0;
//标示是否是读取的第一行
bool IsFirst = true;
//逐行读取CSV中的数据 注意要确保文本中没有逗号
while ((strLine = sr.ReadLine()) != null)
{
aryLine = strLine.Split(‘,‘); //把读取到的内容分割
if (IsFirst == true)
{
IsFirst = false;
columnCount = aryLine.Length;
//创建列
for (int i = 0; i < columnCount; i++)
{
DataColumn dc = new DataColumn(aryLine[i]);
dt.Columns.Add(dc);
}
}
else
{
DataRow dr = dt.NewRow(); //创建行
for (int j = 0; j < columnCount; j++)
{
dr[j] = aryLine[j];
}
dt.Rows.Add(dr);
}
}
sr.Close();
fs.Close();
}
catch (Exception ex)
{
// Mes += "文件导入失败，请检查数据格式！" + ex.ToString() + "/r/n";
}
finally
{
sr.Close();
fs.Close();
}
return dt;
}
#endregion
#region DataTable导出Execl
public static MemoryStream TableToExcel(DataTable dt, string WorkbookType)
{
IWorkbook workbook = null;
if (WorkbookType.ToLower() == "xls")
workbook = new HSSFWorkbook();
else
workbook = new XSSFWorkbook();//xlxs
ISheet sheet = workbook.CreateSheet("Sheet1");
//表头
IRow row = sheet.CreateRow(0);
ICell cell = row.CreateCell(0);
for (int i = 0; i < dt.Columns.Count; i++)
{
cell = row.CreateCell(i);
cell.SetCellValue(dt.Columns[i].ColumnName);
}
//数据
for (int i = 0; i < dt.Rows.Count; i++)
{
IRow row1 = sheet.CreateRow(i + 1);
cell = row1.CreateCell(0);
//cell.SetCellValue(dt.Rows[i][0].ToString());
for (int j = 0; j < dt.Columns.Count; j++)
{
cell = row1.CreateCell(j);
cell.SetCellValue(dt.Rows[i][j].ToString());
}
}
MemoryStream stream = new MemoryStream();
workbook.Write(stream);//生成内存流
return stream;
}
#endregion
#region DataTable生成csv
public static bool TableToCsv(DataTable dt, string path)
{
bool isresult= false;
System.IO.FileStream fs = new FileStream(path, System.IO.FileMode.Create, System.IO.FileAccess.Write);
StreamWriter sw = new StreamWriter(fs, new System.Text.UnicodeEncoding());;
//Tabel header
for (int i = 0; i < dt.Columns.Count; i++)
{
sw.Write(dt.Columns[i].ColumnName);
sw.Write("\t");
}
sw.WriteLine("");
//Table body
for (int i = 0; i < dt.Rows.Count; i++)
{
for (int j = 0; j < dt.Columns.Count; j++)
{
sw.Write(DelQuota(dt.Rows[i][j].ToString()));
sw.Write("\t");
}
sw.WriteLine("");
}
sw.Flush();
sw.Close();
if (File.Exists(path))
{
isresult = true;
}
return isresult;
}
public static string DelQuota(string str)
{
string result = str;
string[] strQuota = { "~", "!", "@", "#", "$", "%", "^", "&", "*", "(", ")", "`", ";", "‘", ",", ".", "/", ":", "/,", "<", ">", "?" };
for (int i = 0; i < strQuota.Length; i++)
{
if (result.IndexOf(strQuota[i]) > -1)
result = result.Replace(strQuota[i], "");
}
return result;
}
#endregion
}
}
ExcelHelper
protected void downloadfile(DataTable dd, string s_path)
{
#region 下载服务器上生成的execl文件
System.IO.FileInfo file = new System.IO.FileInfo(s_path);
HttpContext.Current.Response.ContentType = "application/ms-download";
HttpContext.Current.Response.Clear();
HttpContext.Current.Response.AddHeader("Content-Type", "application/octet-stream");
HttpContext.Current.Response.Charset = "utf-8";
HttpContext.Current.Response.AddHeader("Content-Disposition", "attachment;filename=" + System.Web.HttpUtility.UrlEncode(file.Name, System.Text.Encoding.UTF8));
HttpContext.Current.Response.AddHeader("Content-Length", file.Length.ToString());
HttpContext.Current.Response.WriteFile(file.FullName);
HttpContext.Current.Response.Flush();
HttpContext.Current.Response.Clear();
//下载完成后删除服务器下生成的文件
if (File.Exists(s_path))
{
File.Delete(s_path);
}
HttpContext.Current.Response.End(); ;
#endregion
#region 将二进制字符串数组写入输出流
HttpContext.Current.Response.ContentType = "application/ms-download";
HttpContext.Current.Response.Clear();
HttpContext.Current.Response.AddHeader("Content-Type", "application/octet-stream");
HttpContext.Current.Response.Charset = "utf-8";
HttpContext.Current.Response.AddHeader("Content-Disposition", "attachment;filename=" + System.Web.HttpUtility.UrlEncode("222.xls", Encoding.UTF8));//222.xls下载是默认文件名
HttpContext.Current.Response.BinaryWrite(ProductBLL.download.ExcelHelper.TableToExcel(dd,"xls").GetBuffer());
HttpContext.Current.Response.Flush();
HttpContext.Current.Response.Clear();
HttpContext.Current.Response.End();
#endregion
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时间： 2024-11-06 11:26:02