What is the use of FirstOrDefault in Linq?

What is the use of FirstOrDefault in Linq?

What is the use of FirstOrDefault in Linq?

FirstOrDefault works same as First() does, FirstOrDefault returns the first element from a sequence, but here there is an advantage over First(), so if there is no record in the collection which matches input criteria then FirstOrDefault() can handle null values and it does not throw an exception.

What is FirstOrDefault in Linq C#?

Use the FirstorDefault() method to return the first element of a sequence or a default value if element isn’t there. For that, use the FirstorDefault() method to display the default value.

What does FirstOrDefault mean?

FirstOrDefault. Returns the first element of a collection, or the first element that satisfies a condition. Returns a default value if index is out of range. First and FirstOrDefault has two overload methods.

What does FirstOrDefault return if Null?

FirstOrDefault returns the default value of a type if no item matches the predicate. For reference types that is null . Thats the reason for the exception.

What is difference between first and FirstOrDefault in Linq?

Difference Between First() And FirstOrDefault() The major difference between First and FirstOrDefault is that First() will throw an exception if there is no result data for the supplied criteria whereas FirstOrDefault() will return the default value (null) if there is no result data.

Which is faster find or FirstOrDefault?

Find() runs almost as twice as faster, hoping . Net team will not mark it Obsolete in the future.

What is default LINQ?

FirstOrDefault(IEnumerable) Returns the first element of a sequence, or a default value if the sequence contains no elements.

Does LINQ return null?

LINQ queries should never return null and you should not get an exception if the result is empty.

Should I use FirstOrDefault first?

The major difference between First and FirstOrDefault is that First() will throw an exception if there is no result data for the supplied criteria whereas FirstOrDefault() will return the default value (null) if there is no result data. First() will throw an exception if there is no result data, as you can see below.

Why do we use FirstOrDefault?

FirstOrDefault() Returns first element of a sequence, or a default value if no element is found. It throws an error Only if the source is null. you should use it, If more than one element is expected and you want only first element.

How do I know if a LINQ query is empty?

if (myQuery. Count > 0) You could also use the Count() method on the original query, but then you would be running the query twice, once to count the items, and once to use them. LINQ queries should never return null and you should not get an exception if the result is empty.