Peter follows up on advice for joining collections with LINQ and getting all of the results, but this time, he uses the method-based syntax.
When your objects get sufficiently complicated to create, it's time to simplify your life by moving to the Builder pattern. The Builder pattern is not only a great pattern for creating complicated objects, it supports your application's further evolution.
If you don't use a section in a View, then you'll get an error. But you may not find out until it's too late.
The Entity Framework DbEntityEntry object lets you do all sorts of things you probably didn't think were possible, including getting the latest data from the database (without losing your current data) and invoking the .NET Framework validation subsystem.
If you're passing an anonymous object to an HtmlHelper method (to ActionLink, for example), you might want to consider using that anonymous object to eliminate one of the other parameters.
If you're not using the Entity Framework DbCollectionEntry object when working with an entity class's related objects, then your application is running too slow. Using DbCollectionEntry lets you asynchronously retrieve related objects and get only the objects you want.
If, after pressing F5, you've ever found yourself adjusting the size of your browser window, then this tip is for you. But you shouldn't be surprised if it doesn't work.
Entity Framework Core doesn't have lazy loading (at least, not yet). But you can fake it by using explicit loading, though it doesn't work quite the way you might want. In fact, it's probably a good idea to use this in Entity Framework 6.
Some questions can only be answered by organizing your data into groups and then finding groups that contain particular members or have particular properties.
Complex queries can be solved with a combination of simpler LINQ queries, anonymous objects and the Group/By/Into clauses. Using Group/By/Into will also give you the best possible performance for those complex queries.
You don't have to keep all your configuration settings in your config file. There are even some benefits to exporting sections to separate files.
Here's a trick to have Marten automatically deserialize JSON data only when you want it to.
- By Jason Roberts
When you want to find all the objects that are missing a corresponding object, then you need the LINQ equivalent of an outer join. Here, step by painful step, is how to build that query.
You don't need to take your hands off the keyboard to move to another tab in the Toolbox.
If you decide on using an Enum with enumerated values in your Entity Framework class, here are the tools you'll need to make it work. But an enumerated value shouldn't be your first choice.