读写csv文件[要略]
读写CSV文件
using System;
using System.Text;
using System.Collections; using System.IO;
using System.Data;
using System.Text.RegularExpressions; using System.Diagnostics;
namespace CsvLib
{
#region 类说明信息
///
///
/// - 读CSV文件类,读取指定的CSV文件，可以导出DataTable
/// -
///
///
///
/// yangzhihong
/// 2006/01/16
///
/// 1.0
///
#endregion
public class CsvStreamReader
{
private ArrayList rowAL; //行链表,CSV文件的每一
行就是一个链
private string fileName; //文件名
private Encoding encoding; //编码
public CsvStreamReader()
{
this.rowAL = new ArrayList();
this.fileName = "";
this.encoding = Encoding.Default;
}
///
///
///
///
文件名,包括文件路径
public CsvStreamReader(string fileName)
{
this.rowAL = new ArrayList();
this.fileName = fileName;
this.encoding = Encoding.Default;
LoadCsvFile();
}
///
///
///
///
文件名,包括文件路径
///
文件编码
public CsvStreamReader(string fileName,Encoding encoding)
{
this.rowAL = new ArrayList();
this.fileName = fileName;
this.encoding = encoding;
LoadCsvFile();
}
///
/// 文件名,包括文件路径
///
public string FileName
{
set
{
this.fileName = value;
LoadCsvFile();
}
}
///
/// 文件编码
///
public Encoding FileEncoding
{
set
{
this.encoding = value;
}
}
///
/// 获取行数
///
public int RowCount
{
get
{
return this.rowAL.Count;
}
}
///
/// 获取列数
///
public int ColCount
{
get
{
int maxCol;
maxCol = 0;
for (int i = 0;i
colAL.Count)?maxCol:colAL.Count;
}
return maxCol;
}
}
///
/// 获取某行某列的数据
/// row:行,row = 1代表第一行
/// col:列,col = 1代表第一列
///
public string this[int row,int col]
{
get
{
//数据有效性验证
CheckRowValid(row);
CheckColValid(col);
ArrayList colAL = (ArrayList) this.rowAL[row-1];
//如果请求列数据大于当前行的列时,返回空值
if (colAL.Count < col)
{
return "";
}
return colAL[col-1].ToString();
}
}
///
/// 根据最小行，最大行，最小列，最大列，来生成一个DataTable
类型的数据
/// 行等于1代表第一行
/// 列等于1代表第一列
/// maxrow: -1代表最大行
/// maxcol: -1代表最大列
///
public DataTable this[int minRow,int maxRow,int minCol,int
maxCol]
{
get
{
//数据有效性验证
CheckRowValid(minRow);
CheckMaxRowValid(maxRow);
CheckColValid(minCol);
CheckMaxColValid(maxCol);
if (maxRow == -1)
{
maxRow = RowCount;
}
if (maxCol == -1)
{
maxCol = ColCount;
}
if (maxRow < minRow)
{
throw new Exception("最大行数不能小于最小行数");
}
if (maxCol < minCol)
{
throw new Exception("最大列数不能小于最小列数");
}
DataTable csvDT = new DataTable();
int i;
int col;
int row;
//增加列
for (i = minCol;i <= maxCol;i++)
{
csvDT.Columns.Add(i.ToString());
}
for (row = minRow;row <= maxRow;row++)
{
DataRow csvDR = csvDT.NewRow();
i = 0;
for (col = minCol;col <=maxCol;col++)
{
csvDR[i] = this[row,col];
i++;
}
csvDT.Rows.Add(csvDR);
}
return csvDT;
}
}
///
/// 检查行数是否是有效的
///
///
private void CheckRowValid(int row)
{
if (row <= 0)
{
throw new Exception("行数不能小于0");
}
if (row > RowCount)
{
throw new Exception("没有当前行的数据");
}
}
///
/// 检查最大行数是否是有效的
///
///
private void CheckMaxRowValid(int maxRow)
{
if (maxRow <= 0 && maxRow != -1)
{
throw new Exception("行数不能等于0或小于-1");
}
if (maxRow > RowCount)
{
throw new Exception("没有当前行的数据");
}
}
///
/// 检查列数是否是有效的
///
///
private void CheckColValid(int col)
{
if (col <= 0)
{
throw new Exception("列数不能小于0");
}
if (col > ColCount)
{
throw new Exception("没有当前列的数据");
}
}
///
/// 检查检查最大列数是否是有效的
///
///
private void CheckMaxColValid(int maxCol)
{
if (maxCol <= 0 && maxCol != -1)
{
throw new Exception("列数不能等于0或小于-1");
}
if (maxCol > ColCount)
{
throw new Exception("没有当前列的数据");
}
}
///
/// 载入CSV文件
///
private void LoadCsvFile()
{
//对数据的有效性进行验证
if (this.fileName == null)
{
throw new Exception("请指定要载入的CSV文件名");
}
else if (!File.Exists(this.fileName))
{
throw new Exception("指定的CSV文件不存在");
}
else
{
}
if (this.encoding == null)
{
this.encoding = Encoding.Default;
}
StreamReader sr = new StreamReader(this.fileName,this.encoding);
string csvDataLine;
csvDataLine = "";
while (true)
{
string fileDataLine;
fileDataLine = sr.ReadLine();
if (fileDataLine == null)
{
break;
}
if (csvDataLine == "")
{
csvDataLine =
fileDataLine;//GetDeleteQuotaDataLine(fileDataLine);
}
else
{
csvDataLine += "/r/n" + fileDataLine;//GetDeleteQuotaDataLine(fileDataLine);
}
//如果包含偶数个引号，说明该行数据中出现回车符或包含逗号
if (!IfOddQuota(csvDataLine))
{
AddNewDataLine(csvDataLine);
csvDataLine = "";
}
}
sr.Close();
//数据行出现奇数个引号
if (csvDataLine.Length > 0)
{
throw new Exception("CSV文件的格式有错误");
}
}
///
/// 获取两个连续引号变成单个引号的数据行
///
/// 文件数据行
///
private string GetDeleteQuotaDataLine(string fileDataLine)
{
return fileDataLine.Replace("/"/"","/"");
}
///
/// 判断字符串是否包含奇数个引号
///
/// 数据行
/// 为奇数时，返回为真;否则返回为假
private bool IfOddQuota(string dataLine)
{
int quotaCount;
bool oddQuota;
quotaCount = 0;
for (int i = 0;i < dataLine.Length;i++)
{
if (dataLine[i] == '/"')
{
quotaCount++;
}
}
oddQuota = false;
if (quotaCount % 2 == 1)
{
oddQuota = true;
}
return oddQuota;
}
///
/// 判断是否以奇数个引号开始
///
///
///
private bool IfOddStartQuota(string dataCell)
{
int quotaCount;
bool oddQuota;
quotaCount = 0;
for (int i = 0;i < dataCell.Length;i++)
{
if (dataCell[i] == '/"')
{
quotaCount++;
}
else
{
break;
}
}
oddQuota = false;
if (quotaCount % 2 == 1)
{
oddQuota = true;
}
return oddQuota;
}
///
/// 判断是否以奇数个引号结尾
///
///
///
private bool IfOddEndQuota(string dataCell)
{
int quotaCount;
bool oddQuota;
quotaCount = 0;
for (int i = dataCell.Length -1;i >= 0;i--)
{
if (dataCell[i] == '/"')
{
quotaCount++;
}
else
{
break;
}
}
oddQuota = false;
if (quotaCount % 2 == 1)
{
oddQuota = true;
}
return oddQuota;
}
///
/// 加入新的数据行
///
/// 新的数据行
private void AddNewDataLine(string newDataLine)
{
Debug.WriteLine("NewLine:" + newDataLine);
//return;
ArrayList colAL = new ArrayList();
string[] dataArray = newDataLine.Split(',');
bool oddStartQuota; //是否以奇数个引号开始
string cellData;
oddStartQuota = false;
cellData = "";
for (int i = 0 ;i < dataArray.Length;i++)
{
if (oddStartQuota)
{
//因为前面用逗号分割,所以要加上逗号
cellData += "," + dataArray[i];
//是否以奇数个引号结尾
if (IfOddEndQuota(dataArray[i]))
{
colAL.Add(GetHandleData(cellData));
oddStartQuota = false;
continue;
}
}
else
{
//是否以奇数个引号开始
if (IfOddStartQuota(dataArray[i]))
{
//是否以奇数个引号结尾,不能是一个双引号,并且不是奇数个引号
if (IfOddEndQuota(dataArray[i]) &&
dataArray[i].Length > 2 && !IfOddQuota(dataArray[i]))
{
colAL.Add(GetHandleData(dataArray[i]));
oddStartQuota = false;
continue;
}
else
{
oddStartQuota = true;
cellData = dataArray[i];
continue;
}
}
else
{
colAL.Add(GetHandleData(dataArray[i]));
}
}
}
if (oddStartQuota)
{
throw new Exception("数据格式有问
题
快递公司问题件快递公司问题件货款处理关于圆的周长面积重点题型关于解方程组的题及答案关于南海问题
");
}
this.rowAL.Add(colAL);
}
///
/// 去掉格子的首尾引号，把双引号变成单引号
///
///
///
private string GetHandleData(string fileCellData)
{
if (fileCellData == "")
{
return "";
}
if (IfOddStartQuota(fileCellData))
{
if (IfOddEndQuota(fileCellData))
{
return
fileCellData.Substring(1,fileCellData.Length-2).Replace("/"
/"","/""); //去掉首尾引号，然后把双引号变成单引号
}
else
{
throw new Exception("数据引号无法匹配" + fileCellData);
}
}
else
{
//考虑形如"" """" """"""
if (fileCellData.Length >2 && fileCellData[0] == '/"')
{
fileCellData =
fileCellData.Substring(1,fileCellData.Length-2).Replace("/"
/"","/""); //去掉首尾引号，然后把双引号变成单引号
}
}
return fileCellData;
}
}
}
using System;
using System.Text; using System.Collections; using System.IO;
using System.Data;
namespace CsvLib{
#region 类说明信息
///
///
/// - 写CSV文件类,首先给CSV文件赋值,最后通过Save方
法进行保存操作
/// -
///
///
///
/// yangzhihong
/// 2006/01/16
///
/// 1.0
///
#endregion
public class CsvStreamWriter
{
private ArrayList rowAL; //行链表,CSV文件的每一行就是一个链
private string fileName; //文件名
private Encoding encoding; //编码
public CsvStreamWriter()
{
this.rowAL = new ArrayList();
this.fileName = "";
this.encoding = Encoding.Default;
}
///
///
///
/// 文件名,包括文件路径
public CsvStreamWriter(string fileName)
{
this.rowAL = new ArrayList();
this.fileName = fileName;
this.encoding = Encoding.Default;
}
///
///
///
/// 文件名,包括文件路径
/// 文件编码
public CsvStreamWriter(string fileName,Encoding encoding)
{
this.rowAL = new ArrayList();
this.fileName = fileName;
this.encoding = encoding;
}
///
/// row:行,row = 1代表第一行
/// col:列,col = 1代表第一列
///
public string this[int row,int col]
{
set
{
//对行进行判断
if (row <= 0)
{
throw new Exception("行数不能小于0");
}
else if (row > this.rowAL.Count) //如果当前列链的行数不够，要补齐
{
for (int i = this.rowAL.Count + 1;i <= row;i++)
{
this.rowAL.Add(new ArrayList());
}
}
else
{
}
//对列进行判断
if (col <= 0)
{
throw new Exception("列数不能小于0");
}
else
{
ArrayList colTempAL = (ArrayList) this.rowAL[row-1];
//扩大长度
if (col > colTempAL.Count)
{
for (int i = colTempAL.Count;i <= col;i++)
{
colTempAL.Add("");
}
}
this.rowAL[row-1] = colTempAL;
}
//赋值
ArrayList colAL = (ArrayList) this.rowAL[row-1];
colAL[col-1] = value;
this.rowAL[row-1] = colAL;
}
}
///
/// 文件名,包括文件路径
///
public string FileName
{
set
{
this.fileName = value;
}
}
///
/// 文件编码
///
public Encoding FileEncoding
{
set
{
this.encoding = value;
}
}
///
/// 获取当前最大行
///
public int CurMaxRow
{
get
{
return this.rowAL.Count;
}
}
///
/// 获取最大列
///
public int CurMaxCol
{
get
{
int maxCol;
maxCol = 0;
for (int i = 0;i colAL.Count)?maxCol:colAL.Count;
}
return maxCol;
}
}
///
/// 添加表数据到CSV文件中
///
/// 表数据
/// 从第几列开始,beginCol = 1代表第一列
public void AddData(DataTable dataDT,int beginCol)
{
if (dataDT == null)
{
throw new Exception("需要添加的表数据为空");
}
int curMaxRow;
curMaxRow = this.rowAL.Count;
for (int i = 0;i < dataDT.Rows.Count;i++)
{
for (int j = 0;j
/// 保存数据,如果当前硬盘中已经存在文件名一样的文件，将会覆盖
///
public void Save()
{
//对数据的有效性进行判断
if (this.fileName == null)
{
throw new Exception("缺少文件名");
}
else if (File.Exists(this.fileName))
{
File.Delete(this.fileName);
}
if (this.encoding == null)
{
this.encoding = Encoding.Default;
}
System.IO.StreamWriter sw = new
StreamWriter(this.fileName,false,this.encoding);
for (int i = 0 ;i < this.rowAL.Count;i++)
{
sw.WriteLine(ConvertToSaveLine((ArrayList)
this.rowAL[i]));
}
sw.Close();
}
///
/// 保存数据,如果当前硬盘中已经存在文件名一样的文件，将会覆盖
///
/// 文件名,包括文件路径
public void Save(string fileName)
{
this.fileName = fileName;
Save();
}
///
/// 保存数据,如果当前硬盘中已经存在文件名一样的文件，将会覆盖
///
/// 文件名,包括文件路径
/// 文件编码
public void Save(string fileName,Encoding encoding)
{
this.fileName = fileName;
this.encoding = encoding;
Save();
}
///
/// 转换成保存行
///
/// 一行
///
private string ConvertToSaveLine(ArrayList colAL)
{
string saveLine;
saveLine = "";
for (int i = 0;i< colAL.Count;i++)
{
saveLine += ConvertToSaveCell(colAL[i].ToString());
//格子间以逗号分割
if (i < colAL.Count - 1)
{
saveLine += ",";
}
}
return saveLine;
}
///
/// 字符串转换成CSV中的格子
/// 双引号转换成两个双引号，然后首尾各加一个双引号
/// 这样就不需要考虑逗号及换行的问题
///
/// 格子内容
///
private string ConvertToSaveCell(string cell)
{
cell = cell.Replace("/"","/"/"");
return "/"" + cell + "/"";
}
}
}
![读写csv文件[要略]](https://swf.iask.com/2YKYET4oFmD.jpg?ssig=Viuu62imGv&Expires=1721427805&KID=sina,ishare&range=0-151638)
浙公网安备 33021202002483