Applicationuser list in MVC 5 is empty?

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Hello, I'm currently working on an MVC 5 project with c#.

I'm trying to create a List of the ApplicationUsers to find the customer that corresponds to the correct Invoice. I tried the following below, but got a NullReferenceException:

System.NullReferenceException: Object reference not set to an instance of an object.

The code in my Controller:

C#

private string FindCustomerForReservation(List<Invoice> invoices, List<ApplicationUser> customers, Reservation currentReservation) 
{ 
    string customername; Invoice correspInvoice = invoices.Find(f => f.Id == currentReservation.Invoicenumber); 
    ApplicationUser customer =  customers.Find(k => k.Id == correspInvoice.CustomerId);   
       
    customername = customer.UserName; return customername; 
}

"customer" seems to be empty but I don't know why.

How would I fix this?

What I have tried:

I've tried to look in debugging mode, but I still can't figure out why customer stays empty.

Posted 20-Mar-19 15:06pm

Member 14190344

Updated 20-Mar-19 16:14pm

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Bryian Tan 20-Mar-19 22:42pm

did you check what in the correspInvoice ?

2 solutions

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Dave Kreskowiak · Answer 1 · 2019-03-20T16:15:00

Solution 2

If customers is null, it's because your view code isn't passing anything back to the controller to fill in the customers variable.

It's impossible to tell you why that is from what you posted.

Posted 20-Mar-19 16:15pm

Dave Kreskowiak

sajeetharan · Answer 2 · 2019-03-20T15:35:00

Solution 1

You just need to add a null check

if( customers != null && customers.Count > 0){
   //do the query here
}

Posted 20-Mar-19 15:35pm

sajeetharan