LINQ query where boolean value is true or false

Question

How can I compare a boolean value to both true and false in a LINQ query?

If hideCompleted is true, I want to show values where IsCompleted is false If hideCompleted is false, I want to show values where IsCompleted is true or false

Example:

(t1.IsCompleted ?? false == (hideCompleted == true ? false : (true || false)))

Answer 1

Just to be sure I understand you correctly, if hideCompleted is false, you don't care what the value of IsCompleted is? If so...

!(hideCompleted && t1.IsCompleted)

Answer 2

Build your query based on hideCompleted being true, similar to this approach:

var query = dc.SomeTable;
if (hideCompleted)
{
    query = query.Where(t1 => !t1.IsCompleted);
}

This way when hideCompleted is true you filter for t1.IsCompleted being false. When hideCompleted is false your original query will grab all results regardless of the value of t1.IsCompleted.