///<summary>
/// Get Data From Csv File
/// (Through StreamReader)
///</summary>
///<returns></returns>
private bool GetData(Stream inputStream, out string errMessage, out DataTable dtFile)
{
errMessage = String.Empty;
dtFile = new DataTable();
//this.FileUploadImport.PostedFile.InputStream.CanSeek;
//StreamReader sr = new StreamReader(this.FileUploadImport.PostedFile.InputStream); //update by hwx 11/12/2010
StreamReader sr = new StreamReader(inputStream);
int iColumnCount = 19;//the column count in the file
int iRow = 1;// the row number is being read
int iColumn = 0;// the column number is being read
string strStandardTitle = string.Empty; // the title as it is
//read title row
string strTitle = sr.ReadLine();
//string[] strRowTitle = strTitle.Split(new char[] { ',' });
string[] strRowTitle = new string[iColumnCount];
string strCharTitle;
int iCellNumberTitle = 0;
bool blnQuoteTitle = false;
for (int i = 0; i < strTitle.Length; i++)
{
strCharTitle = strTitle.Substring(i, 1);
if (strCharTitle == ",")// "," is the seperation symbol of csv file,
{
if (!blnQuoteTitle)
{
iCellNumberTitle++;// out of the "" range, "," is the seperation symbol
if (iCellNumberTitle >= iColumnCount)// too many column in this line
{
break;
}
}
else
{
strRowTitle[iCellNumberTitle] += strCharTitle;
}
}
else if (strCharTitle == "\"")// "\"" is the transfer symbol of csv file,
{
blnQuoteTitle = !blnQuoteTitle;
if (blnQuoteTitle && i > 0 && strTitle.Substring(i - 1, 1) == "\"")//in the "" range and there is an transfer symbol before
{
strRowTitle[iCellNumberTitle] += strCharTitle;
}
}
else
{
strRowTitle[iCellNumberTitle] += strCharTitle;
}
}
//read the content
if (strRowTitle.Length == iColumnCount)
{
foreach (string strCell in strRowTitle)
{
iColumn++;
if (strCell.Trim() != string.Empty)
{
dtFile.Columns.Add(strCell);//add new column with name to the data table
}
else //file error:blank title
{
errMessage += "The cell " + iColumn.ToString() + " is blank in the header row.\r\n";
}
}
if (dtFile.Columns.Count == iColumnCount)//make sure that no blank header or error header
{
//read content row
string strLine;
while (!sr.EndOfStream)
{
iRow++;
iColumn = 0;
DataRow dr = dtFile.NewRow();
strLine = sr.ReadLine();
//read csv file line by line
string[] strRow = new string[iColumnCount];
string strChar;
int iCellNumber = 0;
bool blnQuote = false;//whether in the "" range
for (int i = 0; i < strLine.Length; i++)
{
strChar = strLine.Substring(i, 1);
if (strChar == ",")// "," is the seperation symbol of csv file,
{
if (!blnQuote)
{
iCellNumber++;// out of the "" range, "," is the seperation symbol
if (iCellNumber >= iColumnCount)// too many column in this line
{
break;
}
}
else
{
strRow[iCellNumber] += strChar;
}
}
else if (strChar == "\"")// "\"" is the transfer symbol of csv file,
{
blnQuote = !blnQuote;
if (blnQuote && i > 0 && strLine.Substring(i - 1, 1) == "\"")//in the "" range and there is an transfer symbol before
{
strRow[iCellNumber] += strChar;
}
}
else
{
strRow[iCellNumber] += strChar;
}
}
if (iCellNumber + 1 == iColumnCount)
{
foreach (string strCell in strRow)
{
iColumn++;
if (strCell != null && strCell.Trim() != string.Empty)
{
dr[strRowTitle[iColumn - 1]] = strCell.Trim();
}
else//file error:blank cell
{
dr[strRowTitle[iColumn - 1]] = String.Empty;
//errMessage += "The column \"" + strRowTitle[iColumn - 1] + "\" is blank in row " + iRow.ToString() + ".\r\n";
}
}
}
else// file error:the column count of current row do not equal to title's
{
errMessage += "There are more or less cells than title row in the row " + iRow.ToString() + ".\r\n";
}
dtFile.Rows.Add(dr);
}
}
}
else //file error:the count of columns in the file don't equal it should be
{
errMessage += "There are an incorrect number of columns in the header row compared to the template file.\r\n";
}
sr.Close();
sr.Dispose();
errMessage = errMessage.Replace("\r\n", "<br>");
return errMessage == String.Empty ? true : false;
}
///<summary>
/// Get dataset from csv file.
///</summary>
///<param name="filepath"></param>
///<param name="filename"></param>
///<returns>Data Set</returns>
private DataSet GetDatasetFromCsv(string filepath, string filename)
{
string strconn = @"driver={microsoft text driver (*.txt; *.csv)};dbq=";
strconn += filepath; //filepath, for example: c:\
strconn += ";extensions=asc,csv,tab,txt;";
OdbcConnection objconn = new OdbcConnection(strconn);
DataSet dscsv = new DataSet();
try
{
string strsql = "select * from " + filename; //filename, for example: 1.csv
OdbcDataAdapter odbccsvdataadapter = new OdbcDataAdapter(strsql, objconn);
odbccsvdataadapter.Fill(dscsv);
return dscsv;
}
catch (Exception ex)
{
throw ex;
}
}
导入代码，从csv文件得到datatable
