I am using CSV Helper to read a CSV file but the first row is been skipped, I saw that it can be a configuration but I can't see how to force the reading of the first row.
Any ideas?
try
{
using var csv = new CsvReader(file);
var records = csv.GetRecords<TMap>().ToList();
return _mapper.Map<List<T>>(records.ToList());
}
catch (Exception e)
{
throw new Exception($"Error parsing the Csv File. Error: {e.Message}");
}
you need to set the configuration first.
Try this
var config = new CsvConfiguration(CultureInfo.InvariantCulture)
{
HasHeaderRecord = true,
};
try
{
using var csv = new CsvReader(file, config);
var records = csv.GetRecords<TMap>().ToList();
return _mapper.Map<List<T>>(records.ToList());
}
catch (Exception e)
{
throw new Exception($"Error parsing the Csv File. Error: {e.Message}");
}
Related
I'm using ClosedXML to read in what appears to be a simple Excel file. But my program gets an out of memory exception.
Using some standard code to read in Excel sheet to a datatable:
public static void GetDataFromExcel(ref DataTable dt, string path, dynamic worksheet, bool header) //+EAG 6/8/2022
{
//Save the uploaded Excel file.
//DataTable dt = new DataTable();
//Open the Excel file using ClosedXML.
using (XLWorkbook workBook = new XLWorkbook(path))
{
//Read the first Sheet from Excel file.
IXLWorksheet workSheet = workBook.Worksheet(worksheet);
//Create a new DataTable.
// Does the first row contain headers ?
bool firstRow = false;
if (header) firstRow = true;
//Loop through the Worksheet rows.
foreach (IXLRow row in workSheet.Rows())
{
//Use the first row to add columns to DataTable.
if (firstRow)
{
foreach (IXLCell cell in row.Cells())
{
if (!string.IsNullOrEmpty(cell.Value.ToString()))
{
dt.Columns.Add(cell.Value.ToString());
}
else
{
break;
}
}
firstRow = false;
}
else
{
//Add rows to DataTable.
dt.Rows.Add();
int i = 0;
foreach (IXLCell cell in row.Cells())
{
string val = string.Empty;
try
{
val = cell.Value.ToString();
}
catch { }
dt.Rows[dt.Rows.Count - 1][i] = val;
i++;
}
}
}
}
}
The actual spreadsheet has only columns A -> O being used and there are only 130 rows in it. I've used this method in the same program to read in 3 other much larger spreadsheets without issue.
Not sure how to track down a solution to this. Any ideas ?
I'm using Xamarin.Forms and I am trying to convert an html string to a pdf file using EvoPdfConverter, but the problem is that when I try to do so, on the line htmlToPdfConverter.ConvertHtmlToFile(htmlData, "", myDir.ToString()); in the code snippet below, the app just freezes and does nothing, seems like it wants to connect to the given IP, but it can't, however I don't get any errors or exceptions! not even catch!! does anybody know what I should do to resolve this issue? and here is my code for this:
public void ConvertHtmlToPfd(string htmlData)
{
ServerSocket s = new ServerSocket(0);
HtmlToPdfConverter htmlToPdfConverter = new
HtmlToPdfConverter(GetLocalIPAddress(),(uint)s.LocalPort);
htmlToPdfConverter.TriggeringMode = TriggeringMode.Auto;
htmlToPdfConverter.PdfDocumentOptions.CompressCrossReference = true;
htmlToPdfConverter.PdfDocumentOptions.PdfCompressionLevel = PdfCompressionLevel.Best;
if (ContextCompat.CheckSelfPermission(Android.App.Application.Context, Manifest.Permission.WriteExternalStorage) != Permission.Granted)
{
ActivityCompat.RequestPermissions((Android.App.Activity)Android.App.Application.Context, new String[] { Manifest.Permission.WriteExternalStorage }, 1);
}
if (ContextCompat.CheckSelfPermission(Android.App.Application.Context, Manifest.Permission.ReadExternalStorage) != Permission.Granted)
{
ActivityCompat.RequestPermissions((Android.App.Activity)Android.App.Application.Context, new String[] { Manifest.Permission.ReadExternalStorage }, 1);
}
try
{
// create the HTML to PDF converter object
if (Android.OS.Environment.IsExternalStorageEmulated)
{
root = Android.OS.Environment.ExternalStorageDirectory.ToString();
}
htmlToPdfConverter.LicenseKey = "4W9+bn19bn5ue2B+bn1/YH98YHd3d3c=";
htmlToPdfConverter.PdfDocumentOptions.PdfPageSize = PdfPageSize.A4;
htmlToPdfConverter.PdfDocumentOptions.PdfPageOrientation = PdfPageOrientation.Portrait;
Java.IO.File myDir = new Java.IO.File(root + "/Reports");
try
{
myDir.Mkdir();
}
catch (Exception e)
{
string message = e.Message;
}
Java.IO.File file = new Java.IO.File(myDir, filename);
if (file.Exists()) file.Delete();
htmlToPdfConverter.ConvertHtmlToFile(htmlData, "", myDir.ToString());
}
catch (Exception ex)
{
string message = ex.Message;
}
}
Could you try to set a base URL to ConvertHtmlToFile call as the second parameter? You passed an empty string. That helps to resolve the relative URLs found in HTML to full URLs. The converter might have delays when trying to retrieve content from invalid resources URLs.
I am currently saving an excel file like so on my c drive.
public ActionResult Export()
{
try
{
Excel.Application application = new Excel.Application();
Excel.Workbook workbook = application.Workbooks.Add(System.Reflection.Missing.Value);
Excel.Worksheet worksheet = workbook.ActiveSheet;
var people = db.People.ToList();
worksheet.Cells[1, 1] = "Last Name";
worksheet.Cells[1, 2] = "First Name";
int row = 2;
foreach (var person in people)
{
worksheet.Cells[row, 1] = person.PersonFName;
worksheet.Cells[row, 2] = person.PersonLName;
row++;
}
workbook.SaveAs("c:\\test\\worksheet.xls");
workbook.Close();
Marshal.ReleaseComObject(workbook);
application.Quit();
Marshal.FinalReleaseComObject(application);
ViewBag.Result = "Done";
}
catch(Exception ex)
{
ViewBag.Result = ex.Message;
}
return File("c:\\test\\workseet.xls", "application/vnd.ms-excel", "workseet.xls");
// return View("Success");
}
I can go to c:\\test\workseet.xls and it exists there I can do what ever with it...
I am wanting to transform my method from return a view to return a file download...
I figured that it was as simple as this:
return File("c:\\test\\workseet.xls", "application/vnd.ms-excel", "workseet.xls");
However when I do this method and click the link to download, it gives me this error.
The process cannot access the file 'c:\test\workseet.xls' because it is being used by another process.
This duplicate question is just one of those that show how to use EPPlus to generate Excel files on the server side in a scaleable manner. It's actually a lot easier than using Excel interop and a lot faster. You don't even have to save the file to the disk.
public ActionResult ExportData()
{
//Somehow, load data to a DataTable
using (ExcelPackage package = new ExcelPackage())
{
var ws = package.Workbook.Worksheets.Add("My Sheet");
//true generates headers
ws.Cells["A1"].LoadFromDataTable(dataTable, true);
//Save the workbook to a stream
var stream = new MemoryStream();
package.SaveAs(stream);
string fileName = "myfilename.xlsx";
string contentType = "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet";
stream.Position = 0;
return File(stream, contentType, fileName);
}
}
You can use LoadFromDataTable to fill a sheet from a data table or LoadFromCollection to load data from a collection, eg List<Sale>.
Both methods return an ExcelRange object (a range of cells) that you can use to format individual cells, rows, and columns. You can also create tables from a range and apply themes.
The duplicate goes even farther and shows how you can avoid even the MemoryStream
I need to read a folder that contains multiple inner folders, which have more than 100 xml files. I need to read all these xml files one by one. I am using asp.net c# . How can I achieve this.
For Example: A is my folder, containing 1,2,3,4,5,6...200 as sub-folders.
Now the folder 1 contains a.xml, b.xml, c.xml ... Similarly folder 2 contains 1.xml, 2.xml, 3.xml ...
Now I need to read all these xml files one by one from each folder.
you can make use of parallel linq and do as below
int count = 0;
string[] files = null;
try
{
files = Directory.GetFiles(path, "*.*", SearchOption.AllDirectories);
}
catch (UnauthorizedAccessException e)
{
Console.WriteLine("You do not have permission to access one or more folders in this directory tree.");
return;
}
catch (FileNotFoundException)
{
Console.WriteLine("The specified directory {0} was not found.", path);
}
var fileContents = from file in files.AsParallel()
let extension = Path.GetExtension(file)
where extension == ".xml"
let text = File.ReadAllText(file)
select new FileResult { Text = text , FileName = file }; //Or ReadAllBytes, ReadAllLines, etc.
try
{
foreach (var item in fileContents)
{
Console.WriteLine(Path.GetFileName(item.FileName) + ":" + item.Text.Length);
count++;
}
}
catch (AggregateException ae)
{
ae.Handle((ex) =>
{
if (ex is UnauthorizedAccessException)
{
Console.WriteLine(ex.Message);
return true;
}
return false;
});
}
Example takem from : https://msdn.microsoft.com/en-us/library/ff462679%28v=vs.110%29.aspx
I am currently using TrueZip to add a file to a Zip file that was uploaded to a server via MultiPartFile.
The Problem
Upon appending a file the zip becomes invalid. It can no longer be opened as a zip file.
The Code
Let's start with the relevant code in my upload controller (file is the MultiPartFile):
// Get the file
File dest = null;
TFile zip = null;
try {
// Obtain the file locally, zip, and delete the old
dest = new File(request.getRealPath("") + "/datasource/uploads/" + fixedFileName);
file.transferTo(dest);
// Validate
zip = new TFile(dest);
resp = mls.validateMapLayer(zip);
// Now perform the upload and delete the temp file
FoundryUserDetails userDetails = (FoundryUserDetails) SecurityContextHolder.getContext().getAuthentication()
.getPrincipal();
UserIdentity ui = userDetails.getUserIdentity();
MapLayer newLayer = new MapLayer();
// generate the prj
mls.generateProjection(resp, dest.getAbsolutePath(), projection);
The method "generateProjection" is where the file is added:
public void generateProjection(UploadMapResponse resp, String fLoc, FoundryCRS proj) throws NoSuchAuthorityCodeException,
FactoryException, IOException {
TFile projFile = new TFile(fLoc, resp.getLayerName() + ".prj");
CoordinateReferenceSystem crs = CRS.decode(proj.getEpsg());
String wkt = crs.toWKT();
TConfig config = TConfig.push();
try {
config.setOutputPreferences(config.getOutputPreferences().set(FsOutputOption.GROW));
TFileOutputStream writer = new TFileOutputStream(projFile);
try {
writer.write(wkt.getBytes());
} finally {
writer.close();
}
} finally {
config.close();
}
}
In order to test if this worked at all I tried it in a simple main:
public static void main(String[] args) {
File f = new File("C:/Data/SierritaDec2011TopoContours.zip");
TFile tf = new TFile(f);
tf.listFiles();
TFile proj = new TFile(f, "test.prj");
TConfig config = TConfig.push();
try {
config.setOutputPreferences(config.getOutputPreferences().set(FsOutputOption.GROW));
TFileOutputStream writer = null;
try {
writer = new TFileOutputStream(proj);
} catch (FileNotFoundException e1) {
e1.printStackTrace();
}
try {
writer.write("Hello Zip world".getBytes());
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} finally {
try {
writer.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
} finally {
// Pop the current configuration off the inheritable thread local
// stack.
config.close();
}
}
Which, of course, works just fine.
The Question
Does anyone have insight into why, in a web server with a MultiPartFile copied to a local file, the TFileOutputStream fails to write properly?
In a long running server app, you may need to add a call to TVFS.sync() or TVFS.umount() in order to sync or umount archive files. In the case of ZIP files, this will trigger to write the Central Directory at the end of the ZIP file, which is required to form a valid ZIP file.
Please check the Javadoc to decide which call is the best for your use case: http://truezip.java.net/apidocs/de/schlichtherle/truezip/file/TVFS.html
Also, please note that calling TFVS.sync() or TVFS.umount() after each append operation will result in a growing Central Directory to be written each time, which results in huge overhead. So it's worth to consider when exactly you need to do this. Generally speaking this is only required when you want a third party to access the ZIP file. A third party is anyone not interacting with the TrueZIP Kernel for accessing the ZIP file.