How to return null when the Linq query returns empty value?

Question

I have the following code to get values from the list.

GetList().SingleOrDefault(x => x.Key == "MyKey").MyValue;

When there is Key property with value MyKey in a list it is working fine but when there is not Key property with value MyKey in a list it is throwing an NullReferenceException. How can I return null value instead of exception.

System.NullReferenceException
  HResult=0x80004003
  Message=Object reference not set to an instance of an object.

Answer 1

Use ?. and ?[] null-conditional Operators. It tests the value of the left-hand operand for null before performing a member access (?.) or index (?[]) operation; returns null if the left-hand operand evaluates to null.

GetList().SingleOrDefault(x => x.Key == "MyKey")?.MyValue;