C # in Depth (nineth lambda expression and expression tree)

The basic function of LINQ is to create operational pipelines and any state that these operations require. These operations represent a variety of logic about the data: How to filter, how to sort, and how to connect different data sources together.

9.1 Lambda expression as a delegate

• In many ways, lambda expressions can be seen as an evolution of c#2.0 anonymous methods. Almost everything an anonymous method can do can be done with a lambda expression.
• the type of an expression is not itself a delegate type , but it can be implicitly or explicitly converted to a delegate instance in several ways.

9.1.1 Preparation: func<...> delegate type Introduction

If we need to get a string parameter and return an int, we will use Func<string, int>

C # in Depth (nineth lambda expression and expression tree)