Checking For Nullable Value

Question

I'm trying to check if GroupEmails is null before executing this section of my code. However, whenever I am checking for the null value, it returns an error Cannot resolve symbol GroupEmails Is there a better solution for this?

Code

Group = new DB.Group
{
    GroupPhones = groupPhones,

    GroupEmails = new List<DB.GroupEmail>
    {
        new DB.GroupEmail
        {
            Email = groupt.Email
        }
    }
}

Trying to check if null like the following:

Group = new DB.Group
{
    GroupPhones = groupPhones,

    GroupEmails == null ? null : new List<DB.GroupEmail>
    {
        new DB.GroupEmail
        {
            Email = groupt.Email
        }
    }
}

Modified Solution Thanks to @Habib

Group = new DB.Group
{
    GroupPhones = groupPhones,

    GroupEmails = group.Email == null ? null : new List<DB.GroupEmail>
                                               {
                                                  new DB.GroupEmail
                                                  {
                                                    Email = groupt.Email
                                                  }
                                                }
}

If this did work you're saying if it is null, then set it to null. Which wouldn't make any sense. — juharr
– juharr, Commented Jun 5, 2015 at 14:22

Habib · Accepted Answer · 2015-06-05 14:38:27Z

1

There is no need to check for null in object initializer.

 GroupEmails == null ? null : new List<DB.GroupEmail>

GroupEmails property is being initialized in the object initializer for new DB.Group.

This shouldn't even compile as you can't perform checks like these on properties/fields in object initializer.

If you want to initialize your property GroupEmail irrespective of data then you can do:

Group = new DB.Group
{
    GroupPhones = groupPhones,
    GroupEmails = new List<DB.GroupEmail>(),
}

or if you want to compare group.Email to null, then you can do:

GroupEmails = group.Email == null ? null : new List<DB.GroupEmail>
                                          {
                                            new DB.GroupEmail
                                            {
                                              Email = groupt.Email
                                            }
                                          }

edited Jun 5, 2015 at 14:38

answered Jun 5, 2015 at 14:20

Habib

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4 Comments

ChaseHardin Over a year ago

The issue I am running into is that it generates an error while running if I don't pass in any data for the GroupEmails. How could I fix that?

juharr Over a year ago

@CodeChaser If that's the problem then show that code and the error message you are getting.

Habib Over a year ago

@CodeChaser, your first code snippet should work fine as long as you have some valid value in groupt.Email , otherwise you can simply initialize the GroupEmails like ` GroupEmails = new List<DB.GroupEmail>(),` and leave the List initialization.

ChaseHardin Over a year ago

@Habib you are right, no need to check for a null value on GroupEmails. I ended up changing it to look like the following: GroupEmails = group.Email == null ? null : new List<DB.GroupEmail>

ragerory · Accepted Answer · 2015-06-05 14:27:18Z

1

You're creating the object, so I'm not sure why you would check for null...

var group = new DB.Group();
group.GroupPhones = groupPhones;
group.GroupEmails = new List<DB.GroupEmail>();
group.GroupEmails.Add(new DB.GroupEmail() { Email = groupt.Email });

answered Jun 5, 2015 at 14:27

ragerory

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