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c# check IEnumerable for null

debugcn Published at Dev
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I am trying to check a type of IEnuemrable<SystemUser> for null.

I am using this piece of code

            var systemUsers = newActActivityPersons.SelectMany(x => x.Person.SystemUsers);
            if (systemUsers == null || !systemUsers.Any()) return ;

That isn't working. When I try to do something like systemUsers.ToArray() or systemUsers.ToList() I get a null exception. How can I check this for errors?

Justin Self

One of the subsequent x.Person.SystemUsers could be null. .Any() returns true if there is one. If you then try to ToList() afterwards, you might find an x who's Person is null.

Check to make sure that x.Person isn't null before accessing a property on the object.

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