①将csv读取到datatable
②将datatable写到空白exel（使用NPOI）
/// <summary>
/// 获取CSV文件
/// </summary>
public void GetCSVFile()
{
string path = @"E:isec";
DirectoryInfo root = new DirectoryInfo(path);
FileInfo[] files = root.GetFiles();
foreach (FileInfo item in files)
{
if (item.FullName.ToLower().Contains(".csv"))
{
CSVFileHelper dddd = new CSVFileHelper();
string PATH = item.FullName;
DataTable dt = dddd.OpenCSV(PATH);
//将datatable转成excel
string Path = item.FullName.ToLower().Replace(".csv", string.Format("{0}{1}", DateTime.Now.ToString("yyyyMMddHHmmssfff"), ".xlsx"));
ExcelHelperExcel excelHelper = new ExcelHelperExcel();
excelHelper.SaveToExcel(Path, dt, ref _IsSuc, ref _Msg);
}
}
}
//自定义一个类
/// <summary>
/// CSV文件操作类
/// </summary>
public class CSVFileHelper
{
public DataTable OpenCSV(string filePath)//从csv读取数据返回table
{
System.Text.Encoding encoding = GetType(filePath); //Encoding.ASCII;//
DataTable dt = new DataTable();
System.IO.FileStream fs = new System.IO.FileStream(filePath, System.IO.FileMode.Open,
System.IO.FileAccess.Read);
System.IO.StreamReader sr = new System.IO.StreamReader(fs, encoding);
//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 = null;
string[] tableHead = null;
//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
while ((strLine = sr.ReadLine()) != null)
{
if (IsFirst == true)
{
tableHead = strLine.Split(',');
IsFirst = false;
columnCount = tableHead.Length;
//创建列
for (int i = 0; i < columnCount; i++)
{
DataColumn dc = new DataColumn(tableHead[i]);
dt.Columns.Add(dc);
}
}
else
{
aryLine = strLine.Split(',');
DataRow dr = dt.NewRow();
for (int j = 0; j < columnCount; j++)
{
try
{
if (aryLine.Length > j) dr[j] = aryLine[j];
}
catch (Exception)
{
continue;
}
}
dt.Rows.Add(dr);
}
}
if (aryLine != null && aryLine.Length > 0)
{
dt.DefaultView.Sort = tableHead[0] + " " + "asc";
}
sr.Close();
fs.Close();
return dt;
}
public DataTable OpenCSV2(string filePath)//从csv读取数据返回table
{
System.Text.Encoding encoding = GetType(filePath); //Encoding.ASCII;//
DataTable dt = new DataTable();
System.IO.FileStream fs = new System.IO.FileStream(filePath, System.IO.FileMode.Open,
System.IO.FileAccess.Read);
System.IO.StreamReader sr = new System.IO.StreamReader(fs, encoding);
//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 = null;
string[] tableHead = null;
//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
while ((strLine = sr.ReadLine()) != null)
{
if (IsFirst == true)
{
tableHead = strLine.Split(' ');
IsFirst = false;
columnCount = tableHead.Length;
for (int i = 0; i < 20; i++)
{
DataColumn dc = new DataColumn(i.ToString());
dt.Columns.Add(dc);
}
//创建列
DataRow dr = dt.NewRow();
for (int j = 0; j < tableHead.Count(); j++)
{
dr[j] = tableHead[j];
}
dt.Rows.Add(dr);
}
else
{
try
{
aryLine = strLine.Split(' ');
DataRow dr = dt.NewRow();
for (int j = 0; j < aryLine.Count(); j++)
{
dr[j] = aryLine[j];
}
dt.Rows.Add(dr);
}
catch (Exception)
{
throw;
}
}
}
sr.Close();
fs.Close();
return dt;
}
/// 给定文件的路径，读取文件的二进制数据，判断文件的编码类型
/// <param name="FILE_NAME">文件路径</param>
/// <returns>文件的编码类型</returns>
public System.Text.Encoding GetType(string FILE_NAME)
{
System.IO.FileStream fs = new System.IO.FileStream(FILE_NAME, System.IO.FileMode.Open,
System.IO.FileAccess.Read);
System.Text.Encoding r = GetType(fs);
fs.Close();
return r;
}
/// 通过给定的文件流，判断文件的编码类型
/// <param name="fs">文件流</param>
/// <returns>文件的编码类型</returns>
public System.Text.Encoding GetType(System.IO.FileStream fs)
{
byte[] Unicode = new byte[] { 0xFF, 0xFE, 0x41 };
byte[] UnicodeBIG = new byte[] { 0xFE, 0xFF, 0x00 };
byte[] UTF8 = new byte[] { 0xEF, 0xBB, 0xBF }; //带BOM
System.Text.Encoding reVal = System.Text.Encoding.Default;
System.IO.BinaryReader r = new System.IO.BinaryReader(fs, System.Text.Encoding.Default);
int i;
int.TryParse(fs.Length.ToString(), out i);
byte[] ss = r.ReadBytes(i);
if (IsUTF8Bytes(ss) || (ss[0] == 0xEF && ss[1] == 0xBB && ss[2] == 0xBF))
{
reVal = System.Text.Encoding.UTF8;
}
else if (ss[0] == 0xFE && ss[1] == 0xFF && ss[2] == 0x00)
{
reVal = System.Text.Encoding.BigEndianUnicode;
}
else if (ss[0] == 0xFF && ss[1] == 0xFE && ss[2] == 0x41)
{
reVal = System.Text.Encoding.Unicode;
}
r.Close();
return reVal;
}
/// 判断是否是不带 BOM 的 UTF8 格式
/// <param name="data"></param>
/// <returns></returns>
private bool IsUTF8Bytes(byte[] data)
{
int charByteCounter = 1; //计算当前正分析的字符应还有的字节数
byte curByte; //当前分析的字节.
for (int i = 0; i < data.Length; i++)
{
curByte = data[i];
if (charByteCounter == 1)
{
if (curByte >= 0x80)
{
//判断当前
while (((curByte <<= 1) & 0x80) != 0)
{
charByteCounter++;
}
//标记位首位若为非0 则至少以2个1开始 如:110XXXXX...........1111110X
if (charByteCounter == 1 || charByteCounter > 6)
{
return false;
}
}
}
else
{
//若是UTF-8 此时第一位必须为1
if ((curByte & 0xC0) != 0x80)
{
return false;
}
charByteCounter--;
}
}
if (charByteCounter > 1)
{
throw new Exception("非预期的byte格式");
}
return true;
}
}
/// <summary>
/// 将table写入空白exel
/// </summary>
/// <param name="Path"></param>
/// <param name="dt"></param>
/// <param name="_IsSuc"></param>
/// <param name="_Msg"></param>
public void SaveToExcel(string ExportPath, DataTable dt, ref bool _IsSuc, ref string _Msg)
{
_IsSuc = false;
_Msg = "导出失败";
IWorkbook workbook = null;
FileInfo item = new System.IO.FileInfo(System.Environment.CurrentDirectory + @"APP_DataSaveModel.xlsx");
ExcelHelperExcel excelHelper = new ExcelHelperExcel();
var excelFileStream = FileToStream(item.FullName);
int typeExcel = Path.GetExtension(item.Name) == ".xls" ? 0 : 1;
using (excelFileStream)
{
try
{
if (typeExcel == 0)
{
workbook = new HSSFWorkbook(excelFileStream);
}
else
{
workbook = new XSSFWorkbook(excelFileStream);
}
ISheet sheet = workbook.GetSheetAt(0); //取第一个表
int HeaderRow = 1;
int FjColumIndex = 0;
IRow CurrentRow = sheet.CreateRow(HeaderRow);
#region 将数据写入流
///写入header
for (int i = 0; i < dt.Columns.Count; i++)
{
CurrentRow.CreateCell(i);
CurrentRow.GetCell(i).SetCellValue(dt.Columns[i].Caption);
if (dt.Columns[i].Caption.Contains("附件"))
{
FjColumIndex = i;
sheet.SetColumnWidth(FjColumIndex, 60 * 256);
}
}
HeaderRow = HeaderRow + 1;
bool IsNewRow = true;
int StartRow = 0;
///写入表格内容
for (int i = 0; i < dt.Rows.Count; i++)
{
DataRow dr = dt.Rows[i];
#region 新增行
//判断是否是新行
if (dr.ItemArray[0].ToString().Contains("附件") && string.IsNullOrEmpty(dr.ItemArray[1].ToString()))
{
IsNewRow = false;
}
else
{
IsNewRow = true;
}
if (IsNewRow)
{
if (StartRow != 0)
{
//单元格合并
for (int c = 0; c < dt.Columns.Count; c++)
{
sheet.AddMergedRegion(new CellRangeAddress(StartRow, HeaderRow + i-1, c, c));
}
}
CurrentRow = sheet.CreateRow(HeaderRow + i);
StartRow = HeaderRow + i;
}
#endregion
#region 添加数据
if (IsNewRow)
{
for (int a = 0; a < dr.ItemArray.Count(); a++)
{
if (a == FjColumIndex)
{
ICell notesTitle = sheet.GetRow(StartRow).CreateCell(a);
ICellStyle notesStyle = workbook.CreateCellStyle();
notesStyle.WrapText = true;//设置换行这个要先设置
notesTitle.CellStyle = notesStyle;//设置换行
notesTitle.SetCellValue(dr.ItemArray[a].ToString());
//sheet.GetRow(StartRow).CreateCell(a).SetCellValue(dr.ItemArray[a].ToString());
}
else
{
sheet.GetRow(StartRow).CreateCell(a).SetCellValue(dr.ItemArray[a].ToString());
}
}
}
else
{
string fj = sheet.GetRow(StartRow).GetCell(FjColumIndex).ToString() + @"
";
sheet.GetRow(StartRow).GetCell(FjColumIndex).SetCellValue((fj + dr.ItemArray[0].ToString()).TrimEnd('
'));
}
#endregion
}
#endregion
//模板数据
MemoryStream ms = new MemoryStream();
//写入
workbook.Write(ms);
using (FileStream fs = new FileStream(ExportPath, FileMode.Create, FileAccess.Write))
{
byte[] data = ms.ToArray();
fs.Write(data, 0, data.Length);
fs.Flush();
ms.Close();
ms.Dispose();
}
_IsSuc = true;
}
catch (Exception ex)
{
throw ex;
}
finally
{
if (workbook != null) workbook.Close();
}
}
}