如何使用Entity Framework按创建日期升序删除1000条记录？

Question

I have a requirement to delete last 1000 records from a table based upon created date and then insert new 1000 records from a different table.

What would be the best possible way to do it?

public void mymethod()
{
     // TestBasketRequests (delete thousands records from here)
     // Call Delete();
}

public void Delete(IList<TestBasketRequest> TestBasketRequests)
{
    using (var dbContext = new myContext())
    {
        dbContext.Entry(TestBasketRequests).State = EntityState.Deleted;
        dbContext.SaveChanges();
    }
}

Answer 1

The

RemoveRange()

method is used to delete multiple items from the database. And in the method you have to use to get the last 1000 items using

TakeLast() 

will only return last items based on the order they were added to the database.

Inside your mymethod() u have to write something like this

var lastN = MyDbContext.MyDbSet
                   .OrderByDescending(g => g.CreateDate)
                   .Take(1000);

MyDbContext.MyDbSet.RemoveRange(lastN);

I didnt test this code.you can make changes as per your requirements.