By default, queries that return entity types are tracking. Which means you can make changes to those entity instances and have those changes persisted by SaveChanges(). In the following example, the change to the blogs rating will be detected and persisted to the database during SaveChanges(). … See more No tracking queries are useful when the results are used in a read-only scenario. They're quicker to execute because there's no need to set up the change tracking information. … See more Even if the result type of the query isn't an entity type, EF Core will still track entity types contained in the result by default. In the following query, which returns an anonymous type, the … See more Since a tracking query uses the change tracker, EF Core will do identity resolution in a tracking query. When materializing an entity, EF Core will … See more If you find yourself changing the tracking behavior for many queries, you may want to change the default instead: This makes all your queries non … See more WebMay 6, 2024 · We don’t have to do some voodoo magic and attach entity or change its state. EF knows how to do its job. So, when we call .AsNoTracking () our entity will be not tracked (wow, what a surprise! 😉 ). Although we change fields of our entity, nothing will be updated after calling context.SaveChanges (). using (var context = new MyDbContext ...
Entity Framework AsNoTracking - Learn How Not …
WebJan 11, 2024 · No-Tracking Queries Extract data access layer with migrations to the library project and Execute migrations from the command line Output EF SQL Queries to the Console and tips to setup DbContext with the development in mind WebApr 10, 2024 · var query = from c in dbContext.Customers join a in dbContext.Orders on c.CustomerId equals a.CustomerId into ps from suborder in ps.DefaultIfEmpty() select new { Customer = c, Order = suborder //deal with null, assign some generic object or whatever you need }; var result = await query.ToListAsync(); Console.WriteLine(result); how we cooperate
Explicitly Tracking Entities - EF Core Microsoft Learn
WebJul 14, 2024 · Tip. Attaching entities to the same DbContext instance that they were queried from should not normally be needed. Do not routinely perform a no-tracking query and then attach the returned entities to the same context. This will be slower than using a tracking query, and may also result in issues such as missing shadow property values, making it … WebFeb 26, 2024 · as-no-tracking. In the Entity Framework, the DbContext keeps the track of all the changes done in the objects, so that the correct update is done to the database … WebOct 14, 2024 · No-Tracking Queries. Sometimes you may want to get entities back from a query but not have those entities be tracked by the context. This may result in better performance when querying for large numbers of entities in read-only scenarios. The techniques shown in this topic apply equally to models created with Code First and the … how we cook