Home > DeveloperSection > Forums > Default Value when using SingleOrDefault()
Tanuj Kumar

Total Post:134

Posted on    August-14-2014 5:05 AM

 C# C# 

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I have a simple class like:

class Color


    public int ID { get; set; }

    public string ColorName { get; set; }


and then create a collection of these objects:

List<Color> ColorList;

I'd like to then query this collection with LINQ.

Color selected = ColorList.SingleOrDefault(a => a.ID == someVariable);

My collection will have several colors, all with unique IDs, and one color that I'd want to be the default. What I'm looking for is the ability to specify what is returned when someVariable does not match any ID in the collection. Is this possible, or does SingleOrDefault only return null when a match isn't found?

Pravesh Singh

Total Post:412

Posted on    August-14-2014 6:49 AM

Hi  tanuj, 
Yo can do like this:

Use ?? (null coalescing operator)

Color selected = ColorList.SingleOrDefault(a => a.ID == someVariable) ??

                          new Color {Id = 1234, ColorName = "Blue"}; //Default value

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