谁能解释实体框架中的延迟加载？

Question

I want a simple explanation about Lazy loading in Entity Framework with a simple example.

• Why do we use Lazy loading?
• When do we use Lazy loading?

Answer 1

Lazy loading means delaying the loading of related data until you specifically request it.

take an example from here..

Lazy loading

Answer 2

As stated by Mike Stone in this

It's called lazy loading because, like a lazy person, you are putting off doing something you don't want to. The opposite is Eager Loading, where you load something right away, long before you need it.

If you are curious why people might use lazy loading, consider an application that takes a LOOOOONG time to start. This application is probably doing a lot of eager loading... loading things from disk, and doing calculations and whatnot long before it is ever needed.

Compare this to lazy loading, the application would start much faster, but then the first time you need to do something that requires some long running load, there may be a slight pause while it is loaded for the first time. Thus, with lazy loading, you are amortizing the load time throughout the course of running your application... and you may actually save from loading things that the user may never intend to use.