4th Basic Language Features note

Key knowledge:

The delay (Deferred) in the 1.LINQ extension method is performed by:

Orderby/orderbydescending

Reverse

Select

SelectMany

Skip/skipwhile

Take/takewhile

Where

In addition to the above, other extension methods are executed immediately. One interesting feature of the deferred LINQ extension method is that each time the result is enumerated, the result of the query is obtained from scratch. That is, as the data changes, the user can execute the query repeatedly.

2. When using iqueryable<t>, describe the data that is processed from the database.

4th Basic Language Features note