Computer Science C# Which of the following operators executes LINQ query immedia

Question

Computer Science C#

Which of the following operators executes LINQ query immediately and gets the result? 'To' operators Casting operators Grouping operators Joining operators What is the difference between First and FirstOrDefault? First throws an exception whereas FirstOrDefault returns default value, if no elements found for specified criteria. First returns NULL whereas FirstOrDefault returns default value, if no elements found for specified criteria First throws an exception whereas FirstOrDefault returns NULL, if no elements found for specified criteria. First returns void whereas FirstOrDefault returns NULL value, if no elements found for specified criteria.

Explanation / Answer

Quetion 17 -> Immediate query execution is used only when we want to cache the data irrespective of the DB level changes happening after that. To operator (like ToList,  ToDictionary, ToArray). It also works on count(),Average, Max,First

Ans : To Operator.

Question : 18 -> First and FirstOrDefault are almost same. Where as First will throw error when no data is found with the given criteria. FirstOrDefault will return default value.

Ans : First throws and exception whereas FirstOrDefault returns default value. If no elements found for specified criteria.

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