CODEWITHSUNDEEP
c#
Samantha J T Star
Samantha J T Star

Reputation: 32808

Returning null from a get inside of a class

I have the following in my model:

    public string Subject { 
        get { 
            return SubjectReference.GetSubject(SubjectID);
        }
    }

How can I make this so that if the SubjectID is null then the get call will return null? I think there's a way to do this with the ? operator but can I use this inside of a class for model properties?

Upvotes: 0

Views: 67

Answers (3)

Pilgerstorfer Franz
Pilgerstorfer Franz

Reputation: 8359

You may try this 

public string Subject { 
    get { 
        return SubjectID==null ? null : SubjectReference.GetSubject(SubjectID);
    }
}

Upvotes: 1

Jon Newmuis
Jon Newmuis

Reputation: 26502

You may use either a regular if statement, or the ternary operator (? operator) as you've mentioned. Examples of each are provided below.

Using an if statement:

public string Subject { 
    get { 
        if (SubjectID == null) {
            return null;
        }
        return SubjectReference.GetSubject(SubjectID);
    }
}

Using ternary operator:

public string Subject { 
    get { 
        return SubjectID == null ? null : SubjectReference.GetSubject(SubjectID);
    }
}

Upvotes: 3

ChrisWue
ChrisWue

Reputation: 19020

How about

public string Subject
{
   get
   {
       return SubjectID == null ? null : SubjectReference.GetSubject(SubjectID);
   }
}

You could consider string.IsNullOrEmpty(SubjectID) instead when an empty string for SubjectID should also result in a null return.

If your property is a reference type then of course null is a legal return value.

Upvotes: 4

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