c#保存数据格式为.cvs_C#读取csv格式文件的方法
//讀CSV文件類,讀取指定的CSV文件，可以導出DataTable
public class CsvStreamReader
{
private ArrayList rowAL;???????? //行鏈表,CSV文件的每一行就是一個鏈
private string fileName;??????? //文件名
private Encoding encoding;??????? //編碼
public CsvStreamReader()
{
this.rowAL = new ArrayList();
this.fileName = "";
this.encoding = Encoding.Default;
}
///
///
///
/// 文件名,包括文件路徑
public CsvStreamReader(string fileName)
{
this.rowAL = new ArrayList();
this.fileName = fileName;
this.encoding = Encoding.Default;
LoadCsvFile();
}
///
///
///
/// 文件名,包括文件路徑
/// 文件編碼
public CsvStreamReader(string fileName, Encoding encoding)
{
this.rowAL = new ArrayList();
this.fileName = fileName;
this.encoding = encoding;
LoadCsvFile();
}
///
/// 文件名,包括文件路徑
///
public string FileName
{
set
{
this.fileName = value;
LoadCsvFile();
}
}
///
/// 文件編碼
///
public Encoding FileEncoding
{
set
{
this.encoding = value;
}
}
///
/// 獲取行數
///
public int RowCount
{
get
{
return this.rowAL.Count;
}
}
///
/// 獲取列數
///
public int ColCount
{
get
{
int maxCol;
maxCol = 0;
for (int i = 0; i < this.rowAL.Count; i++)
{
ArrayList colAL = (ArrayList)this.rowAL[i];
maxCol = (maxCol > colAL.Count) ? maxCol : colAL.Count;
}
return maxCol;
}
}
///
/// 獲取某行某列的數據
/// 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
{
//數據有效性驗證
CheckRowValid(row);
CheckColValid(col);
ArrayList colAL = (ArrayList)this.rowAL[row - 1];
//如果請求列數據大于當前行的列時,返回空值
if (colAL.Count < col)
{
return "";
}
return colAL[col - 1].ToString();
}
}
///
/// 根據最小行，最大行，最小列，最大列，來生成一個DataTable類型的數據
/// 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
{
//數據有效性驗證
CheckRowValid(minRow);
CheckMaxRowValid(maxRow);
CheckColValid(minCol);
CheckMaxColValid(maxCol);
if (maxRow == -1)
{
maxRow = RowCount;
}
if (maxCol == -1)
{
maxCol = ColCount;
}
if (maxRow < minRow)
{
throw new Exception("最大行數不能小于最小行數");
}
if (maxCol < minCol)
{
throw new Exception("最大列數不能小于最小列數");
}
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;
}
}
///
/// 檢查行數是否是有效的
///
///
private void CheckRowValid(int row)
{
if (row <= 0)
{
throw new Exception("行數不能小于0");
}
if (row > RowCount)
{
throw new Exception("沒有當前行的數據");
}
}
///
/// 檢查最大行數是否是有效的
///
///
private void CheckMaxRowValid(int maxRow)
{
if (maxRow <= 0 && maxRow != -1)
{
throw new Exception("行數不能等于0或小于-1");
}
if (maxRow > RowCount)
{
throw new Exception("沒有當前行的數據");
}
}
///
/// 檢查列數是否是有效的
///
///
private void CheckColValid(int col)
{
if (col <= 0)
{
throw new Exception("列數不能小于0");
}
if (col > ColCount)
{
throw new Exception("沒有當前列的數據");
}
}
///
/// 檢查檢查最大列數是否是有效的
///
///
private void CheckMaxColValid(int maxCol)
{
if (maxCol <= 0 && maxCol != -1)
{
throw new Exception("列數不能等于0或小于-1");
}
if (maxCol > ColCount)
{
throw new Exception("沒有當前列的數據");
}
}
///
/// 載入CSV文件
///
private void LoadCsvFile()
{
//對數據的有效性進行驗證
if (this.fileName == null)
{
throw new Exception("請指定要載入的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);
}
//如果包含偶數個引號，說明該行數據中出現回車符或包含逗號
if (!IfOddQuota(csvDataLine))
{
AddNewDataLine(csvDataLine);
csvDataLine = "";
}
}
sr.Close();
//數據行出現奇數個引號
if (csvDataLine.Length > 0)
{
throw new Exception("CSV文件的格式有錯誤");
}
}
///
/// 獲取兩個連續引號變成單個引號的數據行
///
/// 文件數據行
///
private string GetDeleteQuotaDataLine(string fileDataLine)
{
return fileDataLine.Replace("\\"\\"", "\\"");
}
///
/// 判斷字符串是否包含奇數個引號
///
/// 數據行
/// 為奇數時，返回為真；否則返回為假
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;
}
///
/// 判斷是否以奇數個引號開始
///
///
///
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;
}
///
/// 判斷是否以奇數個引號結尾
///
///
///
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;
}
///
/// 加入新的數據行
///
/// 新的數據行
private void AddNewDataLine(string newDataLine)
{
//System.Diagnostics.Debug.WriteLine("NewLine:" + newDataLine);
return;
ArrayList colAL = new ArrayList();
string[] dataArray = newDataLine.Split(',');
bool oddStartQuota;??????? //是否以奇數個引號開始
string cellData;
oddStartQuota = false;
cellData = "";
for (int i = 0; i < dataArray.Length; i++)
{
if (oddStartQuota)
{
//因為前面用逗號分割,所以要加上逗號
cellData += "," + dataArray[i];
//是否以奇數個引號結尾
if (IfOddEndQuota(dataArray[i]))
{
colAL.Add(GetHandleData(cellData));
oddStartQuota = false;
continue;
}
}
else
{
//是否以奇數個引號開始
if (IfOddStartQuota(dataArray[i]))
{
//是否以奇數個引號結尾,不能是一個雙引號,并且不是奇數個引號
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("數據格式有問題");
}
this.rowAL.Add(colAL);
}
///
/// 去掉格子的首尾引號，把雙引號變成單引號
///
///
///
private string GetHandleData(string fileCellData)
{
if (fileCellData == "")
{
return "";
}
if (IfOddStartQuota(fileCellData))
{
if (IfOddEndQuota(fileCellData))
{
return fileCellData.Substring(1, fileCellData.Length - 2).Replace("\\"\\"", "\\""); //去掉首尾引號，然后把雙引號變成單引號
}
else
{
throw new Exception("數據引號無法匹配" + fileCellData);
}
}
else
{
//考慮形如""??? """"????? """"""
if (fileCellData.Length > 2 && fileCellData[0] == '\\"')
{
fileCellData = fileCellData.Substring(1, fileCellData.Length - 2).Replace("\\"\\"", "\\""); //去掉首尾引號，然后把雙引號變成單引號
}
}
return fileCellData;
}
}
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