Linq learning notes (1 ).

Linq learning notes (1 ).

 

First: Find the First record that meets the condition, and then return, no matter how much data is there. Single: sorts all records first, and then finds the unique record that meets the requirements.

Single (): operates on a set, and only one object must be matched, and this one is returned.

First (): operates on a set. Multiple objects can be matched, but only the First one is returned.

Take (1): to operate on a set, there can be a matching object. Only the first one is returned, but here a set is returned, rather than a single concept.

The Take () method extracts the first n results from the query results. The Skip () method in the instance is the opposite of the Take () method. It can Skip the first n results and return the remaining results. In Linq, the two are called partition operators.