Which is better IQueryable or IEnumerable?
While querying data from database, IEnumerable executes select query on server side, load data in-memory on client side and then filter data. Hence does more work and becomes slow. While querying data from database, IQueryable executes select query on server side with all filters. Hence does less work and becomes fast.
What is the difference between returning IQueryable vs IEnumerable?
The main difference between “IEnumerable” and “IQueryable” is about where the filter logic is executed. One executes on the client side (in memory) and the other executes on the database.
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.
Which is faster IQueryable or IEnumerable?
IQueryable is faster than IEnumerable. In addition to Munesh Sharma’s answer:IEnumerable loads data in-memory and then apply filters to it one by one but IQueryable apply filters all at once and return the result.
When should I use IQueryable?
IQueryable uses Expression objects that result in the query being executed only when the application requests an enumeration. Use IQueryable when you have to run ad-hoc queries against data source like LinQ to SQL Server,Entity framework and other sources which implement IQueryable.
Is IEnumerable faster than list?
We aren’t forcing the caller to convert their data structure to a List unnecessarily. So it isn’t that IEnumerable is more efficient than list in a “performance” or “runtime” aspect. It’s that IEnumerable is a more efficient design construct because it’s a more specific indication of what your design requires.
Why we use IQueryable in LINQ?
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.
Can FirstOrDefault return null?
8 Answers. FirstOrDefault returns the default value of a type if no item matches the predicate. For reference types that is null . Thats the reason for the exception.
Do you think Lazy Loading is better than eager loading?
Lazy Loading vs. Eager Loading. While lazy loading delays the initialization of a resource, eager loading initializes or loads a resource as soon as the code is executed. Eager loading is beneficial when there is an opportunity or need to load resources in the background.
Is IQueryable Lazy Loading?
Use a lazy loading IQueryable when you want to extend deferred querying capabilities to the client, by allowing the client to add their own linq clauses. This defers execution of the entire query until output is required.
Should I return list or IEnumerable?
Returning the least derived type ( IEnumerable ) will leave you the most leeway to change the underlying implementation down the track. Returning a more derived type ( IList ) provides the users of your API with more operations on the result.
What’s the difference between IQueryable and IEnumerable in LINQ?
We use IEnumerable and IQueryable for data manipulation while querying the data from a database or collections. IEnumerable and IQueryable, both are interfaces to a .NET collection. IQueryable exists in System.Linq Namespace while IEnumerable exists in System.Collections Namespace.
When to use the IList interface in LINQ?
The IList interface is useful when you want to perform any operation like get item, add a new item, or remove an item at a specific index from the collection.
Which is the queryable Join method in LINQ?
Join (IQueryable , IEnumerable , Expression >, Expression >, Expression >) Correlates the elements of two sequences based on matching keys. The default equality comparer is used to compare keys.
What’s the difference between icollection, IList and IEnumerable?
In C#, we have been using collections like IEnumerable, ICollection, IList interchangeably but do you really know what is it that separates each other. They all have specific characteristics that differentiate them and makes them adaptable to certain scenarios.