实体框架 - 如何正确更新？

Question

I get the following error: https://i.imgur.com/d13B1vi.png

My system: on server startup, I load all database accounts into a list Accounts_ .

Every 5 minutes I want to update all accounts in the database with updated Accounts_ entries.

So I change for example the level from an entry in Accounts_ and want to sync it to the database. Currently I get the error shown above, but second point is that that update all accounts - but I want to update all that have been changed.

My code: https://i.imgur.com/MYtDXpb.png

Answer 1

Code:

internal static async void SaveAllAccounts()
    {
        try
        {
            using (var db = new gtaContext())
            {
                foreach (var accounts in Model.ServerAccounts.Accounts_.ToList())
                {
                    db.Entry(accounts).State = Microsoft.EntityFrameworkCore.EntityState.Modified;
                    db.Accounts.Update(accounts);
                }
                await db.SaveChangesAsync();
            }
        }
        catch (Exception e)
        {
            Console.WriteLine($"{e}");
        }
    }

sometimes "Connection not opened"