What does virtual do in EF?

What does virtual do in EF?

In the context of EF, marking a property as virtual allows EF to use lazy loading to load it. For lazy loading to work EF has to create a proxy object that overrides your virtual properties with an implementation that loads the referenced entity when it is first accessed.

Can a property be virtual?

In Second Life’s Terms of Service agreement, Linden Lab defines virtual land as a “service” instead of the actual property of the person who pays for it: “Virtual Land is the graphical representation of three-dimensional virtual world space.

Why navigation properties are virtual?

1 Answer. If you define your navigation property virtual , Entity Framework will at runtime create a new class (dynamic proxy) derived from your class and uses it instead of your original class. This new dynamically created class contains logic to load the navigation property when accessed for the first time.

How do you implement lazy loading in EF core?

Lazy loading can be enabled in two ways: Using Proxies….Proxies

1. Install the Microsoft.EntityFrameworkCore.Proxies package. [Package Manager Console]
2. Use the UseLazyLoadingProxies method to enable the creation of proxies in the OnConfiguring method of the DbContext :
3. Make all navigation properties virtual :

Why is DbSet virtual?

While the virtual keyword on the derived DbContext class (virtual DbSet<>) is used for testing purpose (mocking the DbSet property), virtual keyword in this case is not related to lazy loading.

What are people buying when they buy virtual real property?

People are selling and buying art, furniture and even houses and land that exist only virtually. It’s not uncommon for people to buy vacation homes they may only visit a few times a year.

Does a virtual tour help sell a house?

When deciding on who to sell their house with, this is going to be an important factor for the vender, as not only does the addition of virtual tours lead to more qualified viewings of their properties, but these tours also increase the likelihood of a quicker sale, due to increased interest from buyers.

What is a navigation property in entity data model?

A navigation property is an optional property on an entity type that allows for navigation from one end of an association to the other end. Unlike other properties, navigation properties do not carry data.

How do I add navigation property to EDMX?

By adding complex type as property and adding the property by the same name and typing it as the Primary key of a complex type,

1. class Client.
2. {
3. public int ClientId {get; set;}
4. public string ClientName {get; set;}
5. }
6. class Project.
7. {
8. public int ProjectId {get; set;}

How do I stop my EF core from lazy loading?

To turn off lazy loading for all entities in the context, set its configuration property to false.

Is lazy loading good?

When to Use Lazy Loading Lazy loading is great for long web pages with lots of heavyweight content (like images, gifs, and videos) that are non-essential to the user experience on first load. Applying lazy loading to your page content has many potential advantages: It helps your page load faster.

Why do we declare properties virtual in Entity Framework?

When a navigation property is defined as virtual, it can take advantage of certain Entity Framework functionality. The most common one is lazy loading. Lazy loading is a nice feature of many ORMs because it allows you to dynamically access related data from a model.

How can I use lazy loading in EF?

For lazy loading to work EF has to create a proxy object that overrides your virtual properties with an implementation that loads the referenced entity when it is first accessed. If you don’t mark the property as virtual then lazy loading won’t work with it.

How does marking a property as virtual work?

In the context of EF, marking a property as virtual allows EF to use lazy loading to load it. For lazy loading to work EF has to create a proxy object that overrides your virtual properties with an implementation that loads the referenced entity when it is first accessed.

Which is the best way to load Entity Framework?

Entity Framework supports three ways to load related data – eager loading, lazy loading and explicit loading. The techniques shown in this topic apply equally to models created with Code First and the EF Designer.

https://www.youtube.com/watch?v=qVGo3fSeibM