Best way to delete multiple records in a LINQ query?

Question

What is the best way to remove multiple records in one go with LINQ?

Answer 1

Removing many records based on single where clause

context.EntityModel
            .RemoveAll(r => r.property == "propertyEntered");

But you could also Remove records from the database that don't exist in List<ListOfBadRecords>

context.EntityModel
            .Where(w => w.propertyID == ID).ToList()
            .RemoveAll(r => !ListOfBadRecords.Any(a => a.anyID == r.propertyID ));

Edit:

Unsure wich is quicker but you could do the 2nd query with this also

.RemoveAll(r => !ListOfBadRecords.Select(s=>s.propertyID ).Contains(w.propertyID ))

Edit2: don't forget context.SaveChanges(); as i did in the first draft

Answer 2

Using entity framework 6

// Database context
EntitiesContext db = new EntitiesContext(connString);
// Select all the records to be deleted
IEnumerable<entity> list = db.entity.where(x=>x.id == id).toList();
// Use Remove Range function to delete all records at once
db.entity.RemoveRange(list);
// Save changes
db.SaveChanges();

Answer 3

The good old SPROCs.....

You can drag the SPROC to your DBML file and it will generate a rich method in your databasecontext class.

• How to: Call a Stored Procedure by Using LINQ (Visual Basic)
• LINQ and Stored Procedures

Answer 4

maybe its litle late for this answer but today I ran into this demand myself I and I came up with this solution

CustomerDataContext ctx = new CustomerDataContext("connection string");

ctx.Customers.DeleteAllOnSubmit(ctx.Customers.Where(c => c.Name == "david"));

ctx.SubmitChanges();