CODEWITHSUNDEEP
c#linq
chobo2
chobo2

Reputation: 85855

How to check for null before I use in linq?

I have an list of objects that contains another object in it.

List<MyClass> myClass = new List<MyClass>();

I want to do some linq like this

myClass.Where(x => x.MyOtherObject.Name = "Name").ToList();

Thing is sometimes "MyOtherObject" is null. How do I check for this?

Upvotes: 25

Views: 89291

Answers (4)

ProgrammingLlama
ProgrammingLlama

Reputation: 38850

As of C# 6, you can also use a null conditional operator ?.:

myClass.Where(x => x.MyOtherObject?.Name == "Name").ToList();

This will essentially resolve the Name property to null if MyOtherObject is null, which will fail the comparison with "Name".

Try it online

Upvotes: 11

Hugo
Hugo

Reputation: 6464

I would do something like this:

myClass.Where(x => x.MyOtherObject != null)
       .Where(y => y.MyOtherObject.Name = "Name")
       .ToList();

Upvotes: 0

alexn
alexn

Reputation: 59002

Simple, just add an AND clause to check if it's not null:

myClass.Where(x => x.MyOtherObject != null && x.MyOtherObject.Name = "Name").ToList();

Upvotes: 49

Dan J
Dan J

Reputation: 16718

You can just make your predicate check for null...

myClass.Where(x => (x.MyOtherObject == null) ? false : x.MyOtherObject.Name == "Name").ToList();

Upvotes: 3

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