What is the difference between the IQueryable and IEnumerable interface?

The main difference between IEnumerable and IQueryable in C# is that IQueryable queries out-of-memory data stores, while IEnumerable queries in-memory data. Moreover, IQueryable is part of . NET’s System. LINQ namespace, while IEnumerable is in System.

What is 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.

What is IEnumerable and IQueryable 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 MVC IQueryable?

IQueryable is derived from IEnumerable and this executes select query on server side with all filters. IQueryable can be used for querying data from out-memory like remote database, service collections.

What is difference between IEnumerable and IList?

IList doesn’t support further filtering. IEnumerable exists in System. Collections Namespace. IEnumerable is a forward only collection, it can’t move backward and between the items.

Is IQueryable faster than 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.

Should I use IList or List?

The reason to use IList instead of List as parameters, is because many things implement IList (List and [], as two examples), but only one thing implements List . It’s more flexible to code to the interface. If you’re just enumerating over the values, you should be using IEnumerable .

Is IQueryable faster than List?

Here is a test that i have setup this evening. It was made to prove something different, but the outcome was not quite as i expected. I’m running a test with 10000 random queries on an IQueryable and while testing i found out that if i do the same on a List, my test is 20 times faster.

Is IQueryable lazy loading?

Both IQueryable and IEnumerable support lazy loading of data from remote database servers.