I'm using the NPOI Library to import some data from an excel sheet to my database.
One early issue I'm curious about, is typically, to begin, you would have something like this:
snippet
using (FileStream fs = File.Open(filename, FileMode.Open, FileAccess.Read))
{
HSSFWorkbook templateWorkbook = new HSSFWorkbook(fs);
HSSFSheet sheet = templateWorkbook.GetSheet("Sales");
My query is, what happens when the name of the worksheet is different each time, e.g. I plan to import sales data, and the sheets within the workbooks I receive from suppliers are titled by date.
Is there any way that you can specify GetSheet(); to just get the first sheet in the workbook?
Any pointers would be much appreciated,
thanks guys :)
Without trying it out I'd assume that you're looking for getSheetAt.
So it would be:
HSSFSheet sheet = templateWorkbook.GetSheetAt(0);
Related
I am required to write some data into an macro enabled workbook which was developed in 1998, i am using NPOI dotnet core library for this task. I am able to write the values into the excel correctly, however i am seeing that alignment and formatting of the sheets is lost. Screenshots below:
First one shows the file after open the file using NPOI and downloading the same, and second shows the file when it is locally opened.
below is the code i am using
public XSSFWorkbook OpenExcelFile(string filePath, string tempSavePath)
{
using (var stream = new FileStream(tempSavePath, FileMode.OpenOrCreate, FileAccess.ReadWrite))
{
var temphssfwb = new XSSFWorkbook(OPCPackage.Open(filePath));
temphssfwb.Write(stream);
}
XSSFWorkbook hssfwb;
hssfwb = new XSSFWorkbook(OPCPackage.Open(tempSavePath));
hssfwb.CreateSheet("casevalidationsheet");
return hssfwb;
}
Can someone please help me understand why NPOI is ruining the alignment of my excel workbook?
I am developing an Excel Addin that is able to fetch data from our database.Instead of dumping the data directly , I would like to have the data presented in a nice format. I have got our local VBA expert to develop a templates for the same since there can be multiple sheets all of which can have different formats.
It is while adding the worksheet that I am stuck at.
string TemplateFileLocation = Path.GetFullPath(fileName);
if(File.Exists(fileName))
{
Worksheet newWorkSheet = (WorkSheet)Globals.ThisAddin.Aplication.Worksheets.Add(Missing.Value,Missing.Value,1,TemplateFileLocation);
}
The code crashes while it hits this location.
The Error code returned is : 0x800A03EC
I have verified that the path to the template file is correct.
Each of these templates have only one work sheet.
You can use EPPlus
using System.IO;
using System.Reflection;
using OfficeOpenXml;
//Create a stream of .xlsx file contained within my project using reflection
Stream stream = Assembly.GetExecutingAssembly().GetManifestResourceStream("EPPlusTest.templates.VendorTemplate.xlsx");
//EPPlusTest = Namespace/Project
//templates = folder
//VendorTemplate.xlsx = file
//ExcelPackage has a constructor that only requires a stream.
ExcelPackage pck = new OfficeOpenXml.ExcelPackage(stream);
I've tried creating a new Excel file with NPOI and it works OK, reading (only) an Excel file is also OK. However now I want to open an existing Excel file and append some rows on it, it's crashed right at the code line of the NPOI.HSSF.UserModel.HSSFWorkbook constructor. Here is the code:
using(FileStream fs = new FileStream(myFile, FileMode.Append)){
HSSFWorkbook wb = new HSSFWorkbook(fs); //<-- It is crashed right at here
....
}
There is no exception detail, it just shows a window saying that the app is crashed and give 3 options to choose, the middle one is to close the application:
snapshot
That's why I can't understand and feel hard to solve it.
If I change the FileMode to FileMode.Open, the constructor can work well, but that's just for reading. I think there is some thing related to FileAccess policy and tried this:
using(FileStream fs = new FileStream(myFile, FileMode.Append, FileAccess.ReadWrite)){//<-- However it is crashed right at here
HSSFWorkbook wb = new HSSFWorkbook(fs);
....
}
I've tried a workaround by opening (read only) the existing Excel file, copy 1 sheet of it and add this sheet to a new HSSFWorkbook and write (write only) to a new file stream, however there is no way to do that, because the HSSFWorkbook has no collection of Worksheet and there is also no Add method, the new sheet is just created by CreateSheet() method. It's so annoying.
Could you please help me with this? I'm trying NPOI first, then I'll try EPPlus.Your help would be highly appreciated.Thanks.
What's your file format? xls or xlsx? If xlsx, you can try NPOI 2.0 now. xlsx is supported.
Here is the download link: https://npoi.codeplex.com/releases/view/112932
How to read all contents of a column from excel file in 1-d array and in C#? Not using ADO.net approach or excel reader. Also there can be any number of rows in the excel file(how to determine number of rows in the column)..some cells may have blank value in the column...need the most basic approach using Microsoft.Office.Interop.Excel
Is using the Excel Objects Library an option?
http://social.msdn.microsoft.com/Forums/en/vsto/thread/b6e8a28c-6760-4e86-a1aa-e2ce9ec36380
If you are using Office 2007 or better, check out OpenXML. Useful for reading and constructing Word, Excel and PowerPoint documents
http://msdn.microsoft.com/en-us/library/bb448854.aspx
A number of 3rd party component vendors have Excel solutions that allow you to load and create Excel files without having to have Excel installed on the system -- I know for a fact Infragistics has such a solution since I have used it myself and it works pretty nicely
Download Excel DataReader This approach is without using ADO.net approach
FileStream stream = File.Open(filePath, FileMode.Open, FileAccess.Read);
//1. Reading from a binary Excel file ('97-2003 format; *.xls)
IExcelDataReader excelReader = ExcelReaderFactory.CreateBinaryReader(stream);
//...
//2. Reading from a OpenXml Excel file (2007 format; *.xlsx)
IExcelDataReader excelReader = ExcelReaderFactory.CreateOpenXmlReader(stream);
//...
//3. DataSet - The result of each spreadsheet will be created in the result.Tables
DataSet result = excelReader.AsDataSet();
//...
//4. DataSet - Create column names from first row
excelReader.IsFirstRowAsColumnNames = true;
DataSet result = excelReader.AsDataSet();
//5. Data Reader methods
while (excelReader.Read())
{
//excelReader.GetInt32(0);
}
//6. Free resources (IExcelDataReader is IDisposable)
excelReader.Close();
I need a way to read a Excel file from a stream. It doesn't seem to work with the ADO.NET way of doing things.
The scenario is that a user uploads a file through a FileUpload and i need to read some values from the file and import to a database.
For several reasons I can't save the file to disk, and there is no reason to do so either.
So, anyone know of a way to read a Excel file from a FileUpload stream?
It seems i found a soultion to the problem myself.
http://www.codeplex.com/ExcelDataReader
This library seems to work nicely and it takes a stream to read the excel file.
ExcelDataReader reader = new ExcelDataReader(ExcelFileUpload.PostedFile.InputStream);
This can be done easily with EPPlus.
//the excel sheet as byte array (as example from a FileUpload Control)
byte[] bin = FileUpload1.FileBytes;
//gen the byte array into the memorystream
using (MemoryStream ms = new MemoryStream(bin))
using (ExcelPackage package = new ExcelPackage(ms))
{
//get the first sheet from the excel file
ExcelWorksheet sheet = package.Workbook.Worksheets[1];
//loop all rows in the sheet
for (int i = sheet.Dimension.Start.Row; i <= sheet.Dimension.End.Row; i++)
{
//loop all columns in a row
for (int j = sheet.Dimension.Start.Column; j <= sheet.Dimension.End.Column; j++)
{
//do something with the current cell value
string currentCellValue = sheet.Cells[i, j].Value.ToString();
}
}
}
SpreadsheetGear can do it:
SpreadsheetGear.IWorkbook workbook = SpreadsheetGear.Factory.GetWorkbookSet().Workbooks.OpenFromStream(stream);
You can try it for yourself with the free evaluation.
Disclaimer: I own SpreadsheetGear LLC
Infragistics has an excel component that can read an excel file from a stream.
I'm using it in a project here and it works well.
Also the open source myXls component could easily be modified to support this. The XlsDocument contstructor only supports loading from a file given by a file name, but it works by creating a FileStream and then reading the Stream, so changing it to support loading from streams should be trivial.
Edit:
I see that you found a solution but I just wanted to note that I updated the source code for the component so that it now can read an excel file directly from a stream. :-)
I use ClosedXML nuget package to read excel content from stream. It has a constructor overload in XLWorkbook class which takes stream pointing to an excel file (aka workbook).
imported namespace at the top of your code file:
using ClosedXML.Excel;
Source code:
var stream = /*obtain the stream from your source*/;
if (stream.Length != 0)
{
//handle the stream here
using (XLWorkbook excelWorkbook = new XLWorkbook(stream))
{
var name = excelWorkbook.Worksheet(1).Name;
//do more things whatever you like as you now have a handle to the entire workbook.
var firstRow = excelWorkbook.Worksheet(1).Row(1);
}
}