Comment 2. NET web applications was a daunting task. Recently, I had to resolve an issue of a corrupt report file of an enterprise application in production. Reviewing the logs indicated that the reporting module threw a System. Apparently, a lot of folks have had the same issue using the library, and many suggested different workarounds or alternative libraries. The library is available for use via Nugget. To test the performance and robustness of this library, I decided to throw a large dataset at it.

I tried to make it create five sheets in a single workbook and save 1M rows in each sheet. It handled the large data graciously and also with fewer lines of codes compared to ClosedXML. See the source code below. The next time you need to process a large dataset and save it to an Excel file, you ought to try EPPlus library.

How To Format Excel Table Using EPPlus Library Part Fifteen - C#

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epplus loadfromdatatable

Join the DZone community and get the full member experience. Join For Free. EPPlus Apparently, a lot of folks have had the same issue using the library, and many suggested different workarounds or alternative libraries. Generic; using System. IO; using System. Linq; using System. Text; using System. Medium1 ; workSheet1. Medium1 ; workSheet2.Please see below for your reference.

EPPlus is a. This library can be installed from NuGet as a package. NET Core project, you can choose any project template. NET Core Project template. We shall first read this file programmatically. This API returns the result as a type so that you can read the excel result in the type of your choice.

Writing Large Datasets to Excel Files Using EPPlus in C#

Below logic will generate type dynamically which can be cast to appropriate type as needed. This logic is already part of the above code. Here I have used simple accessor class UserDetails.

This class will help in serializing and deserializing the Excel data. Here we need to use ExcelPackage class to create a new excel file with the required details. Writing data to file and creating new excel is just a liner code. Please make a note of below one line doing the magic of loading DataTable into Excel sheet. After executing the above API, new Excel file will be created with the above custom object transformation into respective Excel columns and rows details as below. NET Core framework.

Above ready to use API can be used in. Please visit the GitHub link for the complete code. I have validated the above two API in. NET Core 2. The legacy so-called applications like Excel are no more legacy and can be used on any platform.

Microsoft has made these available for every OS using. Please share this article with your friends and Subscribe to the blog to get a notification on freshly published best practices of software development.

How to export multiple sheet in one file excel, example have multiple users, i want export one student to one sheet.GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together.

Just wanted to know if a particular scenario is supported: the query returns no data but you still want to output the column headers in the sheet.

I have confirmed my DataTable contains the necessary column metadata but the sheet that is produced is entirely empty with no column headers. I am using code similar to :worksheet. LoadFromDataTable data, true ; where the "data" is my datatable. I am having similar problem with it. When there is no data, it just gives generic names to columns.

Such as Column1, Column2 etc. Is there a work around? My workaround was similar except I add an empty row to the data rather than modify the output sheet - I did it this way because I didn't want to interfere with any kind of header formatting not sure if your way would or not. I used the workaround as well -- but I simplified it to append an empty row to the existing datatable instead of instantiating and returning a new one:.

Skip to content. This repository has been archived by the owner. It is now read-only. Dismiss Join GitHub today GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together. Sign up. Not outputting column headers when data is empty Copy link Quote reply. Thank you. This comment has been minimized. Sign in to view. Add worksheetsName ; worksheet. Medium13 ; if dt. Cells[1, i]. CreateCommand ; command. Add new DataColumn column.

ColumnName ; emptyData. Add emptyData. I used the workaround as well -- but I simplified it to append an empty row to the existing datatable instead of instantiating and returning a new one: if data. Add data. Sign up for free to subscribe to this conversation on GitHub.

Already have an account? Sign in. Linked pull requests. You signed in with another tab or window. Reload to refresh your session.GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together.

Whenever I use. Is there any fix for this, yet? I got it working with the following code by just creating a datatable and looping over the properties.

I got the same problem. I'm obtaining an object collection from somewhereand passing that through a select LINQ statement. The select clause is generating new "dynamic objects" since I do not want all properties of the source object present on my spreadsheet. Here is StackOverflow question that brought me here. I made some tests and I think I found my issue. After some thought I realized my class had only fields, no properties It works!

My guess guess is as good as yours I'm not sure this is a bug though. Do we really want LoadFromCollection to include fields? Same problem here while trying to use object to extract a generalized method.

It seems that LoadFromCollection only works with custom classes or anonymous types. TheOutsider89 I simply gave up on that :.

C# Tutorial - How to read excel file - FoxLearn

I was getting the same error and got it working by passing in a DataTable and then calling LoadFromDataTable instead: worksheet. LoadFromDataTable dtData,true. This solved my problem.

epplus loadfromdatatable

Many thanks to brmiguel5 :. Skip to content. This repository has been archived by the owner. It is now read-only. Dismiss Join GitHub today GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together. Sign up. Copy link Quote reply. This comment has been minimized. Sign in to view. Please provide some code to replicate.This example shows you how to export datatable or dataset data to excel in asp.

By using EPPlus. You can merge cells, give background color and can format the cell text in excel using EPPlus. In the below example we have a dataset contains student details and product details.

Datatable1 students data will be exported to students sheet and Datatable2 products data will be exported to products sheet in the same excel.

And we can dynamically merge the heading of the sheet and can give the border for dynamic data. C code using System; using System. Generic; using System. Linq; using System. Web; using System. UI; using System. WebControls; using System. Add "StudentID", typeof int ; dt. Add "StudentName", typeof string ; dt. Add "RollNumber", typeof int ; dt. Add "TotalMarks", typeof int ; dt. Add 1, "Jame's",; dt. Add 2, "Steave, Smith",; dt.

Add 5, "Smith",; dt. Add "ProductID", typeof int ; dt. Add "ProductName", typeof string ; dt. Add dt. Count; ws. Cells[rowstart, colstart, rowend, colend].

TableName; ws. Center; ws. Solid; ws. SetColor System. Cells[rowstart, colstart]. Column i. AutoFitColumns ; ws. BinaryWrite xp. GetAsByteArray ; Response.GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together.

Our previous version is 2. Trying version 4. Anyway, when saving data to sheets now EPPlus v4. Can we still have an option to write column headers to a sheet even if there are no rows in the datatable?

Skip to content. This repository has been archived by the owner. It is now read-only. Dismiss Join GitHub today GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together.

Sign up. Copy link Quote reply. Cells "A1". LoadFromDataTable Data, True when the "Data" datatable contains no rows but still contains named columnsthe headers are no longer saved to the sheet. JanKallman added a commit that referenced this issue Dec 13, Fixed issue 51 This comment has been minimized. Sign in to view. Is there a way to pull this fix via NuGet to replace 4. Fixed in 4. JanKallman closed this Mar 30, Sign up for free to subscribe to this conversation on GitHub.

Already have an account? Sign in. Linked pull requests. You signed in with another tab or window. Reload to refresh your session. You signed out in another tab or window.The issue is caused by a ClosedXML implementation bug. It can easily be reproduced by using the following snippet a modified version of their Pivot Tables example and opening the resulting file in Excel:.

Workbook while it's allowed to contain 0 or 1. With that being said, the only way to fix it is inside the source code by modifying the above method as follows:. Update: The good news are that my post triggered a ClosedXML source repository fix by Francois Botha also credits to petelids who brought it up thereso you can take the code from there until their next release which hopefully will include it.

I am trying to export some data to an excel sheet S1 whose data would be shown as Pivoted views in the next two sheets S2 and S3.

I am able to create a single pivot and it works perfect. But when I create two pivots, the consequent Excel file renders as corrupt. Try this modification. I made a note where I added an additional line. Also, I think the AddNew method may have had the wrong worksheet reference?

Writing Large Datasets to Excel Files Using EPPlus in C#

You may have been trying to add a pivot table on top of another one. That may have been the real issue rather than the additional line I added.

Add "Data" ; wsData. Cell "A1". Cell "A2". Cell "A3". Cell "A4". Cell "B1". Cell "B2". Cell "B3". Cell "B4". AddNew namewsPT. Cell "A1"source ; pt. Add "Category" ; pt.

Add "Number". ShowAsPctFrom "Category". And "A". GetNext RelType. AppendChild pivotCache ; workbookPart. CacheId ; pivotTablePart. Excel ; Add "output table" ; sheet1.

Cell 11. InsertTable dsData. AddNew "PivotTable1"ptSheet. Cell 31dataRange ; pt1. Add "CX" ; pt1.