Delete from Query

Definition

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.

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

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

Purpose

Deleting entities using SubmitChanges 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
SubmitChanges 1,000 ms 2,000 ms 5,000 ms
DeleteFromQuery 1 ms 1 ms 1 ms

FAQ

Why DeleteFromQuery is faster than SubmitChanges, BulkSubmitChanges, and BulkDelete?

DeleteFromQuery executes a statement directly in SQL such as DELETE FROM [TableName] WHERE [Key].

Other operations normally require one or multiple database round-trips which makes the performance slower.