How to solve an exception error?

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i have a above code on my controller,

C#

public ActionResult Details(int? id)
{
   var dbo = new DrugBusiness();
   DrugModel dm = dbo.DetailsMethod(id);
   DateTime drug_expdate = dbo.GetAll().Find(x => x.DrugId == id).ExpiryDate;
   DateTime now = DateTime.Today;
   var days = drug_expdate - now;
   if(drug_expdate<=now)
   {
      ViewBag.msg = "The Drug has expired";
   }
   else
   {
      ViewBag.msg = "This Drug expires in " + days.Days + "Days";
   }
return PartialView(dbo.DetailsMethod(id));

but when im running my Details view it's giving me an error in yellow line, this what

it says "{"Object reference not set to an instance of an object."}"

please help me ive try but nothing is working, please

Posted 26-Jul-15 22:44pm

Syabonga Mthethwa

Updated 26-Jul-15 22:47pm

Wendelius

v3

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Wendelius 27-Jul-15 4:48am

And what is the line where you get the error?

Syabonga Mthethwa 27-Jul-15 5:52am

this is the line "DateTime drug_expdate = dbo.GetAll().Find(x => x.DrugId == id).ExpiryDate; "

4 solutions

Solution 4

this is the line that is giving me error "DateTime drug_expdate = dbo.GetAll().Find(x => x.DrugId == id).ExpiryDate; "

Posted 26-Jul-15 23:55pm

Syabonga Mthethwa

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This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

E.F. Nijboer · Accepted Answer · 2015-07-26T22:51:00

Solution 1

You might notice the questionmark after int?. This means that id can also be NULL so you have to check for that.

if(id.HasValue) {
  // do something
} else {
  // id is NULL, do something else
}

Good luck!

Posted 26-Jul-15 22:51pm

E.F. Nijboer

Comments

Syabonga Mthethwa 27-Jul-15 6:33am

thanks Nijboer

Wendelius · Accepted Answer · 2015-07-26T22:52:00

Probably the id you're passing cannot be found in records. Because of this, the ExpiryDate cannot be accessed. Either there is no such id or you have provided a null value for the id.

Is it intentional that you can pass a nullable into to the method. Based on the code it looks like it's not designed to handle such input.

Sreekanth Mothukuru · Accepted Answer · 2015-07-26T23:43:00

Solution 3

Check to see if the value for "drug_expdate is not null before performing any calculations.

DateTime drug_expdate = dbo.GetAll().Find(x => x.DrugId == id).ExpiryDate;
DateTime now = DateTime.Today;

if (drug_expdate != null)
{
    var days = drug_expdate - now;
}

Posted 26-Jul-15 23:43pm

Sreekanth Mothukuru

How to solve an exception error?

4 solutions

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Solution 2

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How to solve an exception error?

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Solution 2

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