Object reference not set to an instance of an object

Praveen Kumar

6y771.NET

Controller

[HttpPost]
[ValidateAntiForgeryToken]
public ActionResult Edit(ContactDetailViewModel model)
{
if (ModelState.IsValid)
{
model.Id = _Login.GetCurrentUserCustomer().Id;
using (var dbContextScope = _dbContextScopeFactory.Create())
{
Contact contact = model;
contact.ContactAttributes = new List();
var user = _Login.GetCurrentUser();
if(model.Attributes != null)
{
foreach (var item in model.Attributes)
{
if (item.AddressValue != null)
{
ContactAttribute attribute = new ContactAttribute()
{
AttributeValue = item.AddressValue,
Code = item.AddressElement,
Contact = contact//,
};
_ContactRepo.UpdateContactAttribute(attribute, user);
contact.ContactAttributes.Add(attribute);
}
}
}
try
{
_ContactRepo.UpdateContact(contact, user);
}
catch (RMException rme)
{
rme.Log();
ModelState.AddModelError("", "Updating contact failed. Please check your values and try again.");
return PartialView(model);
}
dbContextScope.SaveChanges();
}
}
else
{
return PartialView(model);
}
return RedirectToAction("Index", "Contact");
}

Model

public ContactAttribute UpdateContactAttribute(ContactAttribute attribute, User user)
{
var dbAttribute = DbContext.ContactAttributes.Find(attribute.ContactId);
dbAttribute.AttributeValue = attribute.AttributeValue;
dbAttribute.Code = attribute.Code;
UpdateWithUser(dbAttribute, user.UserId, "ContactRepo.UpdateContactAttribute");
return dbAttribute;
}

2 Replies

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Jignesh Kumar6y ago
Hey Praveen,

As Salman indicate that you are trying to perform action on null value. I mean either you are trying to access values or set values to null object. Here there are two thing need to be check,

First your parater attribute and second one is dbAttribute. Please try to put debugger and check which values you are getting and put null check for that area.
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Salman Beg6y ago
Object reference not set to an instance of an object error will arise when any value is null. As per your screenshot dbAttribute value is null.when you are using Find method and from there it is not able to find and it is returning null value.in the next statement you are assigning value to dbAttribute and as it is null so it will throw exception. Check breakpoint and try to find out why it is returning null. To handle the error what you can do is, if(dbAttribute != null) then execute that statement. Thanks.
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