Delete from Query

Description

DELETE all rows from the database using a LINQ Query without loading entities in the context.

A DELETE statement is built using the LINQ expression and directly executed in the database.

This feature is provided by Z.EntityFramework.Extensions that's used by more than 2000 customers all over the world.

// DELETE all customers that are inactive
context.Customers.Where(x => !x.IsActive).DeleteFromQuery();

// DELETE customers by id
context.Customers.Where(x => x.ID == userId).DeleteFromQuery();

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Purpose

Deleting entities using SaveChanges normally requires to load them first in the ChangeTracker. These additional round-trips are often not necessary.

DeleteFromQuery gives you access to directly execute a DELETE statement in the database and provide a HUGE performance improvement.

Performance Comparisons

Operations 1,000 Entities 2,000 Entities 5,000 Entities
SaveChanges 1,000 ms 2,000 ms 5,000 ms
DeleteFromQuery 1 ms 1 ms 1 ms