While reading excel file using EPPLUS getting object reference not set to an instance of an object error

Question

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I am using below code to read SharePoint excel file using EPPLUS

C#

var webRequest = HttpWebRequest.Create("SharepointURLPath") as HttpWebRequest;
                    webRequest.UserAgent = @"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/51.0.2704.106 Safari/537.36";
    
                    var webResponse = webRequest.GetResponse();
    
                    using (var webResponseStream = webResponse.GetResponseStream())
                    using (var memoryStream = new MemoryStream())
                    {
                        webResponseStream.CopyTo(memoryStream);
                        using (var excelPackage = new ExcelPackage(memoryStream))
                        {
                            var value = excelPackage.Workbook.Worksheets.First().Cells[1, 1].Value;
                            
                        }
                    }

I am getting

Object reference not set to an instance of an object

error at below line

var excelPackage = new ExcelPackage(memoryStream)

I am unable to find the root cause of the issue.

What I have tried:

how to solve

Object reference not set to an instance of an object

issue

Posted 4-Dec-18 0:36am

Member 14061262

Updated 24-Oct-22 5:52am

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Comments

CHill60 4-Dec-18 6:41am

Are you sure it's that line ... and not the one above?

Member 14061262 4-Dec-18 6:51am

Yes. While debugging mentioned line itself throwing error.

F-ES Sitecore 4-Dec-18 11:04am

Untested guess but try

webResponseStream.CopyTo(memoryStream);
memoryStream.Position = 0;
using (var excelPackage = new ExcelPackage(memoryStream))

3 solutions

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OriginalGriff · Answer 1 · 2018-12-04T04:42:00

This is one of the most common problems we get asked, and it's also the one we are least equipped to answer, but you are most equipped to answer yourself.

Let me just explain what the error means: You have tried to use a variable, property, or a method return value but it contains null - which means that there is no instance of a class in the variable.
It's a bit like a pocket: you have a pocket in your shirt, which you use to hold a pen. If you reach into the pocket and find there isn't a pen there, you can't sign your name on a piece of paper - and you will get very funny looks if you try! The empty pocket is giving you a null value (no pen here!) so you can't do anything that you would normally do once you retrieved your pen. Why is it empty? That's the question - it may be that you forgot to pick up your pen when you left the house this morning, or possibly you left the pen in the pocket of yesterdays shirt when you took it off last night.

We can't tell, because we weren't there, and even more importantly, we can't even see your shirt, much less what is in the pocket!

Back to computers, and you have done the same thing, somehow - and we can't see your code, much less run it and find out what contains null when it shouldn't.
But you can - and Visual Studio will help you here. Run your program in the debugger and when it fails, VS will show you the line it found the problem on. You can then start looking at the various parts of it to see what value is null and start looking back through your code to find out why. So put a breakpoint at the beginning of the method containing the error line, and run your program from the start again. This time, VS will stop before the error, and let you examine what is going on by stepping through the code looking at your values.

But we can't do that - we don't have your code, we don't know how to use it if we did have it, we don't have your data. So try it - and see how much information you can find out!

Member 13534368 · Answer 2 · 2019-06-20T17:37:00

Solution 2

I have a same problem.

when i use

var excelPackage = new ExcelPackage(memoryStream)

i found a same problem

but

when i debugging and previous to previous line and step again, it pass..

another program i use EPPLUS not found this proplem but haven't try.

Posted 20-Jun-19 17:37pm

Member 13534368

GuinnessNH · Answer 3 · 2022-10-24T05:52:00

Solution 4

Add this line beforehand (use the Commercial enum if Commercial).

C#

ExcelPackage.LicenseContext = LicenseContext.NonCommercial;

Posted 24-Oct-22 5:52am

GuinnessNH

Updated 24-Oct-22 5:53am

v2

Comments

Richard Deeming 24-Oct-22 12:06pm

A suggestion relating to v5, which was released in March 2020, is not a suitable solution for a question posted in 2018!

There is absolutely no way the OP was using v5, so your suggestion does not apply.

Stick to answering new questions unless you have something new and interesting to add to the discussion.