What is the difference between IQueryable and IEnumerable in C#?
Querying data from a database, IEnumerable execute a select query on the server side, load data in-memory on a client-side and then filter data. Querying data from a database, IQueryable execute the select query on the server side with all filters.
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.
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.
Is it better to use IEnumerable or list?
In terms of performance, the answer is it depends. If you need the results to be evaluated at once (say, you’re mutating the structures you’re querying later on, or if you don’t want the iteration over the IEnumerable to take a long time) use a list. Else use an IEnumerable .
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.
Does IQueryable inherit IEnumerable?
The IQueryable interface inherits the IEnumerable interface so that if it represents a query, the results of that query can be enumerated.
Is list faster than IEnumerable?
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.
What’s the difference between IQueryable and IEnumerable?
The main differences between IQueryable and IEnumerable are: IEnumerable is best suitable for working with in-memory collection, whereas IQueryable is best suited for remote data sources, like a database or web service. IEnumerable has immediate execution, whereas IQueryable has deferred execution or lazy loading.
When to use IEnumerable?
Long story short, use IEnumerable anytime you only need iteration, use IList when you need to index directly and need a dynamically sized array (if you need indexing on a fixed size array then just use a standard array).
What is IEnumerable in .net?
Mathematically, and in computing, an enumerable is anything that maps to a countable set. So outside of .net an IObservable may be enumerable. In .NET IEnumerable is considered the dual opposite of IObservable in a pull vs push duality.
What is IEnumerable string?
An IEnumerable is general sequence of string that can be iterated but doesn’t allow random access. A List is a specific random-access variable-size collection.