Where is IQueryable used?

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.

What is IQueryable in C# with example?

The IQueryable interface is intended for implementation by query providers. 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.

What is an IQueryable?

IQueryable is best to query data from out-memory (like remote database, service) collections. While query data from a database, IQueryable execute the select query on the server side with all filters. IQueryable is suitable for LINQ to SQL queries. IQueryable supports custom query using CreateQuery and Execute methods.

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.

What do you need to know about IQueryable in Java?

IQueryable simply pairs the expression tree ( Expression) with a query provider ( IQueryProvider ). The query provider ( IQueryProvider) is responsible for interpreting the expression tree, executing the query, and fetching the results. The key word here is “interpreting”.

Which is the first method of the IQueryable?

Each method produces a new IQueryable, where the expression tree has been altered to include additional elements of the query. The first IQueryable we need to consider is Source.Students. In this case, the expression tree ( IQueryable.Expression) consists entirely of a single node ( ConstantExpression ).

How does system.linq.queryable consume an IQueryable?

The methods in System.Linq.Queryable operate in a different manner. Each consumes an IQueryable, which is simply a pairing of an expression tree (Expression) with a query provider (IQueryProvider). Each method produces a new IQueryable, where the expression tree has been altered to include additional elements of the query.

Is the where / ORDER BY clause in IQueryable immutable?

IQueryable is immutable. Don’t worry this is how you are supposed to do it. This is how the queries are formed internally. All the extension methods like “Where” don’t actually change the object. They just return a new one. The code that you claim works should not work. The method doesn’t even have a type.