Why do we use IQueryable?
Why do we use IQueryable?
IQueryable is suitable for querying data from out-memory (like remote database, service) collections. While querying data from a database, IQueryable executes a “select query” on server-side with all filters. IQueryable is beneficial for LINQ to SQL queries.
When should I use IQueryable and IEnumerable using LINQ?
In LINQ to query data from database and collections, we use IEnumerable and IQueryable for data manipulation. IEnumerable is inherited by IQueryable, Hence IQueryable has all the features of IEnumerable and except this, it has its own features. Both have its own importance to query data and data manipulation.
What is IQueryable?
The IQueryable interface inherits the IEnumerable interface so that if it represents a query, the results of that query can be enumerated. Enumeration causes the expression tree associated with an IQueryable object to be executed. The definition of “executing an expression tree” is specific to a query provider.
Why IEnumerable does not support lazy loading?
IQueryable supports deferred execution. IEnumerable doesn’t support lazy loading. IQueryable support lazy loading. Hence it is suitable for paging like scenarios.
When should I use IEnumerable?
IEnumerable is best to query data from in-memory collections like List, Array etc. IEnumerable doesn’t support add or remove items from the list. Using IEnumerable we can find out the no of elements in the collection after iterating the collection. IEnumerable supports deferred execution.
What is lazy loading example?
Instead of loading the entire web page and rendering it to the user in one go as in bulk loading, the concept of lazy loading assists in loading only the required section and delays the remaining, until it is needed by the user. For example, say a user requests for the logo of GeeksForGeeks from a search engine.
What’s the difference between IQueryable and IEnumerable in LINQ?
In LINQ to query data from database and collections, we use IEnumerable and IQueryable for data manipulation. IEnumerable is inherited by IQueryable, Hence IQueryable has all the features of IEnumerable and except this, it has its own features. Both have its own importance to query data and data manipulation.
What is the IQueryable interface in C #?
What is IQueryable in C#? Let us first see the definition of IQueryable as shown below. As you can see in the above image, the IQueryable is an interface and it is available in System.Linq namespace. The IQuerable interface is a child of the IEnumerable interface.
Which is a child of the IEnumerable interface?
Let us first see the definition of IQueryable as shown below. As you can see in the above image, the IQueryable is an interface and it is available in System.Linq namespace. The IQuerable interface is a child of the IEnumerable interface. So we can store IQuerable in a variable of type IEnumerable.
When to use IEnumerable interface in Entity Framework?
IEnumerable interface is useful when your collection is loaded using LINQ or Entity framework and you want to apply filter on the collection. Consider the below simple code which uses IEnumerable with entity framework. It’s using a Where filter to get records whose EmpId is 2.