Develop Reference

Embed file in excel worksheet/cell

I hope someone can help me. Is there a way to embed a specific file (.txt) into an excel cell? I'm currently using epplus, and I would like to embed programmatically a file into a specific excel cell. I did manage to add a hyperlink, but my goal is to have it embedded.
Worksheet.Cells[rowNumber, colNumber].Value = ....
Is there any way to do it? I couldn't find anything online.

As mentioned in the comments, you can certainly put text within a cell, but bear in mind Excel does have a limit to the number of characters it will allow in a single cell. It's pretty large, but conceivably the contents of a text file could exceed that limit -- even if future versions of Excel keep increasing what the limit is (as they have in the past).
You can also embed an OLE object in your worksheet, and a text file qualifies for that. I don't know that you can assign it to a cell, per se. You can change the location, shape and behavior to fit in a cell and behave as though it's part of a cell, but I don't know that it ever belongs to a range the way formulas do. I could be wrong.
The basic construct of how to embed an OLE object into a worksheet is as follows:
Excel.OLEObject ole = ws.OLEObjects().Add(Filename: #"C:\Users\hambone\Documents\foo.txt");
This is the equivalent of the VBA:
Set ole = sh.OLEObjects.Add(Filename:="C:\Users\hambone\Documents\foo.txt")
The method returns an OLEObject object, which you can then shape to behave the way you want:
ole.Height = 5;

how to get correct format from xlsx - to interpret floating point number formated as text

i am aware of the floating point inaccurrancy, this is just how to get the correct text FORMAT!! by openxml from the xlsx and show the value like excel does. I am not able to edit the excel file and change the format or something like that, because of some reasons.
while working with numbers formated as numbers everything runs fine
formatted as text or general, the number 0.813 is saved as 0.812999.., excel shows it correct!, but via openxml i can't get the used format (0.000), anyone an idea to get the format?
maybe this is a standard format, not saved and choosen by other values?

finally I am using the ugly solution to get rid of this ..
if the cellFormat NumberFormatId is 2 I try to parse the value to double and then to string with two decimals
double.Parse(displayedValue).ToString("0.00");
not my desired solution, but for the moment this works .. of course also with all other unit tests

C# - Decimals not writing out to Excel

I have an ETL that's saving data to an Excel file. The issue is that the decimals are not being written out for integers. Example:
14.00
is being written out as
14
My code for writing out that line is
loWorksheet.Cells[liRowNum, 5] = lcAmount.ToString("0.00");
When I step through the code, it shows as 14.00, but on the Excel file it is not retaining the decimal places. Is this something that can be fixed in my code or is this an Excel issue? Any suggestions?

I'm quite sure you have to set format for your cells. I can't check right now, but it will be something like
xlYourRange.NumberFormat = "0.00";
You can check this question Set data type like number, text and date in excel column using Microsoft.Office.Interop.Excel in c#

If you really want the data to be displayed literally the way it is in the source file, you have to deal with trade-offs. The simplest way is to format the data as text. You can do this a cell at a time or for entire columns:
loWorksheet.Columns["A:E"].NumberFormat = "#";
The trade-off is it's just text at this point. You can't add, sum, average, whatever.
On the other hands, if your data looks like this:
4.0
4.00
4.000
You can't really keep it as numbers and expect to retain the original format without doing some funny business.
If it's consistently two decimal places, and you know it's going to be, then I agree with #RenatZamaletdinov's solution.
And you might want to consider other strings and what Excel might to do them
0000123 becomes 123
10/23 will probably render as a date, depending on your localization
12345678901234567890 will render as scientific notation probably
These are all avoided if you make the numeric format text (#), but again without knowing what you plan to do with the data, it's hard to say if this is the correct approach.

Wrap lcAmount.ToString("0.00");in a pair of quotes and put an equal sign in front of it. This will prevent excel from overriding the format.
loWorksheet.Cells[liRowNum, 5] = "=" + '"' lcAmount.ToString("0.00") + '"';

Formatting cell values from OpenXML

I'm opening up xlsx files as a package and reading the contents of the xml files. I'm able to get the shared strings, borders, etc that I need and it's orders of magnitude faster than when I was using Interop. The only issue I have is when it comes to pulling out numbers and formatting them properly based on what the formatting is in the Excel file.
Is there a generic function somewhere that takes a value and a format and returns the formatted string? For example, if I have the value 31502008 and the custom format "$* #,##0_);$* (#,##0)" is there a simple way to get what Excel shows (which is $31,502,008). Obviously Excel knows how to handle it, but I have some sheets that have a crazy number of custom formats and I'm wondering how best to ensure that the string I get back in code matches what is seen in Excel.
Any ideas?
Thanks a lot for any help.

How to get cell value with applied formatting (formatted cell value) with OpenXML SDK

I've been googling and searching on the site for the answer, but I couldn't find a solution - everywhere people mostly discuss how to add new number format to the document and apply it.
What I need is to get the cell value as a string with applied formatting - i.e. same string as would be displayed by Excel.
I already figured that there's no easy way or built-in function which would return the readymade formatted value for a cell.
So it seems to me that to get the value I need to do two things:
1. Get the format string.
2. Format the cell value using this string.
But I have problems with both steps.
One can easily get CellFormat instance which would contain NumberFormatId:
CellFormat cellFormat = (CellFormat) document.WorkbookPart.WorkbookStylesPart.Stylesheet.CellFormats.ElementAt(cell.StyleIndex);
But how to get the format string with this NumberFormatId, if the id corresponds to one of standard predefined formats? (i.e. is below 160) They are not in the spreadsheet document and I can't believe that they should be hardcoded in the application.
Also, once the format string is somehow obtained, how to apply it to the cell value? So far I understand, the code should check the type of the cell value and if is Number - convert it to string using the format string.
I found this page which mentions using Microsoft.Office.Excel.Interop, but I would prefer to stay with OpenXML SDK only.
Overall, I'm very surprised that it's so difficult to find a definitive answer to this question on the Web as I thought that this would be something which many developers need in their daily work.

Men, this is a hard one... I will be adding here things that i found that could be worth..
First is to get the numbering format of the cell (once you have the CellFormat:
string format = excel.WorkbookPart.WorkbookStylesPart.Stylesheet.NumberingFormats.Elements<NumberingFormat>()
.Where(i => i.NumberFormatId.ToString() == cellFormat.NumberFormatId.ToString())
.First().FormatCode;
For more information about this you can go to: NumberingFormats
Im trying to find out how to apply this format to the cell.CellValue property... I think thats the way you have to go!
Ok, reading the ClosedXml code (its open source), seems to be easy to get the format.
Simply convert the value text to its type (int, double, etc) and call the ToString method passing the format. I was trying do that with the String.Format and didnt work. Ive tested the ToString and it works, but something still missing.
I recommend to you to look at this class and get the code from the method GetFormattedString() as #El G tell in his comment.
Bassicaly you will have to add something like this:
double d = double.Parse(cell.CellValue.InnerText);
string val = d.ToString(format);
Hope it helps you...

If you want to take cell value with applied formatting, same as displayed in Excel, use .Text property of Cell object. Like this:
String formattedValue = cell.Text