CODEWITHSUNDEEP
c#.netlinq
Lee Grissom
Lee Grissom

Reputation: 9953

How do I return a default value if collection is empty?

(Fees is a collection of Fee objects.)

If the Fees collection is empty, I want to assign a default value of 0 to FeeValue.

Below is what I currently do. However, I'd prefer to not new up an instance of Fee. What are some alternative ways to write this? Thanks!

from w in Widgets
select new {
  FeeValue = w.Fees.DefaultIfEmpty(new Fee()).First().Value, // Value is a Double
};

Upvotes: 1

Views: 417

Answers (2)

Michael Johnson
Michael Johnson

Reputation: 31

If you want to avoid the empty Select() this should work as well:

Widgets
.Select(w => 
    new 
    {
        FeeValue = w.Fees.DefaultIfEmpty(yourDefaultValue).First()
    });

Upvotes: 0

cbp
cbp

Reputation: 25628

Your questions is a bit confusing, but I think I know what you're asking...

Something like this:

Widgets
    .Select(w => 
        new 
        {
            FeeValue = w.Fees.Select(f => f.Value).DefaultIfEmpty(yourDefaultValue)
        });

Upvotes: 4

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