Why are expression trees needed?

Question

.NET

Hello.
How expression trees are used in practice in C#. Should a novice programmer delve into this topic?

Answer 1

An expression tree is a representation, for example, "a+b>0" not as executable code, but as data, as an object model. Why is this needed? The most common use of DVs is in the context of, for example, databases or any other consumer that needs a string that might be sent over the network. For example, an SQL query is built from the object model (a binary expression tree) (roughly speaking, something like SELECT xxx WHERE a+b>0) and sent to the server. Or this object model is passed to a method that builds a request to Google according to all the rules along the tree (a string that is then sent via http).

Answer 2

A beginner doesn't really need to go deep. Familiarize yourself with what it is and try to understand it is always good.
Used by the environment itself to build LINQ expressions. In practice, to build lambda expressions. Here is a good article on the subject.

Answer 3

Beginning programmer in what area? If the web, then I think you should not go deep, at least it will not be urgent. But if the area intersects with the translation, for example, from the same Linq to something else, for example, in a SQL query, then I think it's worth reading.