WebApr 13, 2024 · Also, install the Microsoft.EntityFrameworkCore and Microsoft.EntityFrameworkCore.SqlServer packages respectively.. 3. Add Models/Entities We will make use of EntityFrameworkCore as the ORM. Models/Entities (classes) are used to define the database objects (tables) and those models are mapped to the database … Webpublic class ClassADb : DBContext, IClassADataSource { public DBSet As {get;set} public DBSet Bs {get;set} public DBSet Cs {get;set} ... } When I create the DB and explore it I can see that it was created what seems to be correctly: 当我创建数据库并探索它时,我可以看到它的创建似乎是正确的:
跟踪,类型,实例,实体的区别 - 我爱学习网
WebNov 3, 2016 · Currently Find () is a simple method defined on DbSet by design, as opposed to a general query method that composes with things like Include () I agree there is some value in doing what you said. Query performance: Client evaluation for tracked queries returning an entity by key #1948 is about doing this automatically for the query methods. WebPass inn a params array of Expression> [] of navigationproperties and then just use the Include method to include the navigation property in a foreach. And starting with IQueryable query = dbContext.Set (); Then you will not have null values in the navigation properties. Do this before you detach. burma road winchester postcode
DBContext Find with Includes - where lambda with Primary keys
WebMar 29, 2024 · So, this is possible if a bit of a faff! In the below I setup the mock context and sets and can call include successfully. I think that the secret sauce is in stubbing the calls through to Provider, Expression and GetEnumerator and in setting the DbSet properties on the stubbed context to the stubbed sets and not stubbing the context to returning them. WebOct 14, 2024 · The Find method on DbSet uses the primary key value to attempt to find an entity tracked by the context. If the entity is not found in the context then a query will be sent to the database to find the entity there. Null is returned if the entity is not found in the context or in the database. WebApr 20, 2024 · Benefits of using Find () It’s a DbSet method Executes immediately If the key is already in memory and being tracked by the context, it avoids unnecessary database queries and returns the object which is already in tracking. var userLinq = context.Users.FirstOrDefault (u => u.Id == 2); Console.WriteLine (userLinq.Name); burmarsh bus stop