LINQ and Lambda

Question 1

Name and describe the two LINQ syntaxes.

Answer 1

Query: similar to SQL for the database. It is defined within the C# code.

Method: use extension methods included in the Enumerable or Queryable static class, similar to how you would call the extension methods of any class.

Question 2

When is a LINQ query executed?

Answer 2

When the query variable is iterated over.

Question 3

What is an anonymous method?

Answer 3

A method without a name they can be defined using the delegate keyword and can be assigned to a variable of delegate type.

Question 4

What is Expression body syntax?

Answer 4

Member => Expression

Question 5

What is a lambda expression? Why is it used in LINQ queries?

Answer 5

A lambda expression is a convenient way of defining an anonymous function that can be passed around as a variable or as a parameter to a method call. It is used in LINQ queries as a parameter.

Question 6

What is LINQ?

Answer 6

Language integerated query is Microsoft .NET Framework component that adds querying capabilities to .NET languages with a syntax similar to SQL.