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Do C# NPOI support phonetic text (japanese/chinese text)?

I am converting excel file .xlsx with phonetic text (Japanese text) but the output file gives out warning that there are unreadable contents, and the data are missing from the file.
It seems that the issues were because NPOI can't process the phonetic guide from Microsoft Excel in Japanese language.
This only applies on .xlsx files and not .xls files.
I'm not sure how to attach the sample excel file but the image above shows what it looks like. Basically, if you use Microsoft Excel in Japanese version, there will be automatic phonetic guide for every kanji (Chinese character).
public void writeoutput(string val)
{
try
{
IWorkbook book;
string outPath = "<path for input file>";
using (FileStream file = new FileStream(outPath, FileMode.Open, FileAccess.Read))
{
try
{
book = new XSSFWorkbook(file);
}
catch (Exception e)
{
book = null;
}
if (book == null)
{
book = new HSSFWorkbook(file);
}
file.Close();
}
//ISheet sheet = outputSheet.GetSheet("Sheet1");
ISheet sheet = book.GetSheetAt(0);
sheet.CopySheet("NewSheet", false);
IRow dataRow = sheet.GetRow(35) ?? sheet.CreateRow(35);
ICell cell = dataRow.GetCell(8) ?? dataRow.CreateCell(8);
cell.SetCellValue(val);
//File.Delete(outPath);
outPath = "<path for output file>";
using (FileStream file = new FileStream(outPath, FileMode.OpenOrCreate, FileAccess.Write))
{
book.Write(file);
file.Close();
}
}
catch (Exception e)
{
Console.WriteLine(e);
}
finally
{
textBox2.Text = "done";
}
}
I tried disable the phonetic guide in Microsoft Excel and the processing of the .xlsx file works with no issues but I can only disable the phonetic guide on the text one by one and it is very time consuming.

.Net Core: Reading data from CSV & Excel files

Using .net core & c# here.
I have a UI from which user can upload the Excel or CSV files. Once they upload this goes to my web api which handles the reading of the data from these files and returns json.
My Api code as:
[HttpPost("upload")]
public async Task<IActionResult> FileUpload(IFormFile file)
{
JArray data = new JArray();
using (ExcelPackage package = new ExcelPackage(file.OpenReadStream()))
{
ExcelWorksheet worksheet = package.Workbook.Worksheets[1];
//Process, read from excel here and populate jarray
}
return Ok(data );
}
In my above code I am using EPPlus for reading the excel file. For excel file it works all fine but it cannot read csv file which is the limitation of EPPlus.
I searched and found another library CSVHelper: https://joshclose.github.io/CsvHelper/ The issue with this is it does vice versa and can read from CSV but not from Excel.
Is there any library available which supports reading from both.
Or would it be possible use EPPlus only but convert uploaded CSV to excel on the fly and then read. (please note I am not storing the excel file anywhere so cant use save as to save it as excel)
Any inputs please?
--Updated - Added code for reading data from excel---
int rowCount = worksheet.Dimension.End.Row;
int colCount = worksheet.Dimension.End.Column;
for (int row = 1; row <= rowCount; row++)
{
for (int col = 1; col <= colCount; col++)
{
var rowValue = worksheet.Cells[row, col].Value;
}
}
//With the code suggested in the answer rowcount is always 1

You can use EPPLus and a MemoryStream for opening csv files into an ExcelPackage without writing to a file. Below is an example. You may have to change some of the the parameters based on your CSV file specs.
[HttpPost("upload")]
public async Task<IActionResult> FileUpload(IFormFile file)
{
var result = string.Empty;
string worksheetsName = "data";
bool firstRowIsHeader = false;
var format = new ExcelTextFormat();
format.Delimiter = ',';
format.TextQualifier = '"';
using (var reader = new System.IO.StreamReader(file.OpenReadStream()))
using (ExcelPackage package = new ExcelPackage())
{
result = reader.ReadToEnd();
ExcelWorksheet worksheet =
package.Workbook.Worksheets.Add(worksheetsName);
worksheet.Cells["A1"].LoadFromText(result, format, OfficeOpenXml.Table.TableStyles.Medium27, firstRowIsHeader);
}
}

Here's using Aspose, which is unfortunately not free, but wow it works great. My API is using the streaming capability with Content-Type: multipart/form-data rather than the IFormFile implementation:
[HttpPut]
[DisableFormValueModelBinding]
public async Task<IActionResult> UploadSpreadsheet()
{
if (!MultipartRequestHelper.IsMultipartContentType(Request.ContentType))
{
return BadRequest($"Expected a multipart request, but got {Request.ContentType}");
}
var boundary = MultipartRequestHelper.GetBoundary(MediaTypeHeaderValue.Parse(Request.ContentType), _defaultFormOptions.MultipartBoundaryLengthLimit);
var reader = new MultipartReader(boundary, HttpContext.Request.Body);
var section = (await reader.ReadNextSectionAsync()).AsFileSection();
//If you're doing CSV, you add this line:
LoadOptions loadOptions = new LoadOptions(LoadFormat.CSV);
var workbook = new Workbook(section.FileStream, loadOptions);
Cells cells = workbook.Worksheets[0].Cells;
var rows = cells.Rows.Cast<Row>().Where(x => !x.IsBlank);
//Do whatever else you want here

Please try with below code
private string uploadCSV(FileUpload fl)
{
string fileName = "";
serverLocation = Request.PhysicalApplicationPath + "ExcelFiles\\";
fileName = fl.PostedFile.FileName;
int FileSize = fl.PostedFile.ContentLength;
string contentType = fl.PostedFile.ContentType;
fl.PostedFile.SaveAs(serverLocation + fileName);
string rpath = string.Empty, dir = string.Empty;
HttpContext context = HttpContext.Current;
string baseUrl = context.Request.Url.Scheme + "://" + context.Request.Url.Authority + context.Request.ApplicationPath.TrimEnd('/') + '/';
try
{
rpath = serverLocation + fileName;//Server.MapPath(dir + fileName);
using (Stream InputStream = fl.PostedFile.InputStream)
{
Object o = new object();
lock (o)
{
byte[] buffer = new byte[InputStream.Length];
InputStream.Read(buffer, 0, (int)InputStream.Length);
lock (o)
{
File.WriteAllBytes(rpath, buffer);
buffer = null;
}
InputStream.Close();
}
}
}
catch (Exception ex)
{
lblSOTargetVal.Text = ex.Message.ToString();
}
return rpath;
}

Use the Open XML SDK package and add insert working solution for it.

Excel file is not opening after writing special or illegal characters programatically

I am using below code to get values (which include invalid characters) from SQL Table and to generate an excel file. But when I open the file it is giving error - "We have found a problem with content..."
I am not able to paste that character here.
Is there any way to write those invalid characters in excel using code and after that when I open the file, it should open properly.
FileInfo NewFile = new FileInfo(#"D:\pg\splchar.xls");
using (OfficeOpenXml.ExcelPackage xlPackage = new OfficeOpenXml.ExcelPackage(NewFile))
{
OfficeOpenXml.ExcelWorksheet worksheet1 = xlPackage.Workbook.Worksheets.Add("Test1");
int rowId = 0;
string str="";
for (int i = 0; i < resultTable.Rows.Count; i++)
{
rowId++;
str=resultTable.Rows[i]["Value"].ToString();
worksheet1.Cell(rowId, 1).Value = str;
}
xlPackage.Save();
}
invalid char

Need to open and save Excel file before reading it

I have a method were I create an Excelsheet. When the file is created I need to open it and save it manually in Excel before I can read it with Excel Data Reader. If I open and save the exact same file without changeing anything I can read it like I wan't it to work. Does anyone know how I can:
a) Save it properly when creating the file (using EPPlus)?
or
b) Open the already created file and save it properly by using C# before I try to read it?
My create method:
public void CreateAnnuityExcelSheet(List<Calculation> cList, FormCollection form, int DTCyear)
{
string fileName = "test";
string path = #"C:\ExcelFiles\" + fileName + ".xlsx"; //Path for the file
FileInfo info = new FileInfo(path);
info.Directory.Create(); //If C:\ExcelFiles does not exist, create it
if (!info.Exists)
{
using (ExcelPackage package = new ExcelPackage(info))
{
ExcelWorksheet ws = package.Workbook.Worksheets.Add(fileName);
//Filling the worksheet with values here...
package.SaveAs(info);
}
}
}
My read method:
[HttpPost]
public ActionResult ShowExcelFile(GetExcel model)
{
List<Calculation> cList = new List<Calculation>();
DataSet result = null;
var file = model.Files[0];
if (file != null && file.ContentLength > 0)
{
// .xlsx
IExcelDataReader reader = ExcelReaderFactory.CreateOpenXmlReader(file.InputStream);
reader.IsFirstRowAsColumnNames = true;
result = reader.AsDataSet();
reader.Close();
var PV = Convert.ToDecimal(data.Table.Rows[1][6]); //Works fine if the file is opened and saved in Excel. Else null..
//Work with the dataset here. When the file is not opened and saved it gets null everywhere. Else it works fine
}
return View("ShowExcelFile", model);
}
I have also tried using WriteAllBytes instead of using package.SaveAs():
byte[] data = package.GetAsByteArray();
System.IO.File.WriteAllBytes(path, data);
This gets my the exact same result. I still need to open and save the file manually.

C# VS2005 Convert Pipe Delimited .TXT to Excel Workbook .XLS

I am using VS2005 C# and im trying to convert a pipe delimited text file to excel workbook format. Below is my code:
public partial class TextToExcel : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
}
protected void SaveAsExcelBtn_Click(object sender, EventArgs e)
{
string xlExtension = ".csv";
string strExcelOutputFilename = "C:/Documents and Settings/rhlim/My Documents/" + DateTime.Now.ToString("yyyyMMddHHmmss") + xlExtension;
// Before attempting to import the file, verify
// that the FileUpload control contains a file.
if (TextFile.HasFile)
{
// Get the name of the Excel spreadsheet.
string strFileName = Server.HtmlEncode(TextFile.FileName);
// Get the extension of the text.
string strExtension = Path.GetExtension(strFileName);
// Validate the file extension.
if (strExtension != ".TXT" && strExtension!=".txt")
{
Response.Write("<script>alert('Failed to import. Cause: Invalid text file.');</script>");
return;
}
// Generate the file name to save the text file.
//string strUploadFileName = "C:/Documents and Settings/rhlim/My Documents/Visual Studio 2005/WebSites/SoD/UploadFiles/" + DateTime.Now.ToString("yyyyMMddHHmmss") + strExtension;
using (StreamWriter outputWriter = new StreamWriter(File.Create(strExcelOutputFilename)))
{
StreamReader inputReader = new StreamReader(TextFile.FileContent);
string fileContent = inputReader.ReadToEnd();
fileContent = fileContent.Replace('|', ';');
outputWriter.Write(fileContent);
TextFile.SaveAs(strExcelOutputFilename);
inputReader.Close();
}
//string strExcelOutputFilename = "C:/Documents and Settings/rhlim/My Documents/" + DateTime.Now.ToString("yyyyMMddHHmmss")+xlExtension;
// Save the Excel spreadsheet on server.
//TextFile.SaveAs (strExcelOutputFilename);
}
else Response.Write("<script>alert('Failed to import. Cause: No file found');</script>");
}
}
Currently I am having some file saving errors
Any suggestions? Thanks a lot!

That's because Excel doesnt support pipelines you have to convert it so comma's or semicolumns like:
using (StreamWriter outputWriter = new StreamWriter(File.Create(strExcelOutputFilename)))
{
StreamReader inputReader = new StreamReader(TextFile.FileContent);
string fileContent = inputReader.ReadToEnd();
fileContent = fileContent.Replace('|', ',');
outputWriter.Write(fileContent);
}

I googled and hope it will help you: http://csharp.net-informations.com/excel/csharp-create-excel.htm
Or, already answered: Create Excel (.XLS and .XLSX) file from C#
At the first link, the line xlWorkSheet.Cell[x,y] to put element in the dedicated cell.
FYI, xlsx format(new from Office 2007) will give you a great manipulation capability with code.

For generating and manipulating excel files, I personally prefer the NPOI library. Download it from Codeplex, add reference to the NPOI dlls to your project. Store a “template” excel file you would like in a known location, with the any column headers/formatting that you need. Then you just use npoi to make a copy of the template file and manipulate it at a sheet/row/column level and put whatever data you want.
The sample code snippet looks something like this. Assuming you have split your input into a List of strings
const string ExcelTemplateFile = "~/Resources/ExcelInputTemplate.xls";
const string ExcelWorksheetName = "Output Worksheet";
const int RequiredColumn = 1;
private HSSFWorkbook CreateExcelWorkbook(IEnumerable<String> inputData)
{
FileStream fs = new FileStream(Server.MapPath(ExcelTemplateFile), FileMode.Open, FileAccess.Read);
// Getting the complete workbook...
HSSFWorkbook templateWorkbook = new HSSFWorkbook(fs, true);
// Getting the worksheet by its name...
HSSFSheet sheet = templateWorkbook.GetSheet(ExcelWorksheetName);
int startRowIterator = 1;
foreach (string currentData in inputData)
{
sheet.CreateRow(startRowIterator).CreateCell(RequiredColumn).SetCellValue(currentData);
}
}