In C#, IEnumerable
and IQueryable
are both interfaces that represent a sequence of elements that can be enumerated or iterated over. However, there are some key differences between the two interfaces:
Definition:
IEnumerable
is a base interface that represents a non-generic collection of elements that can be enumerated using aforeach
loop or theGetEnumerator()
method.IQueryable
is a more specific interface that extendsIEnumerable
and represents a collection of elements that can be queried using a query language, such as LINQ.Deferred execution:
IEnumerable
uses deferred execution, which means that the query is executed when the sequence is enumerated. This can lead to multiple enumerations of the same sequence, which can impact performance.IQueryable
, on the other hand, uses deferred execution with query optimization, which means that the query is executed when the sequence is enumerated, but the query is optimized before execution to minimize the number of database requests or other operations.Query execution:
IEnumerable
executes the query on the client side, which means that all data is loaded into memory before the query is executed.IQueryable
, on the other hand, executes the query on the server side, which means that only the requested data is loaded into memory.Type of data source:
IEnumerable
is typically used with in-memory collections, such as lists or arrays.IQueryable
, on the other hand, is typically used with remote data sources, such as databases or web services.
In summary, IEnumerable
and IQueryable
are both interfaces that represent a sequence of elements, but they differ in their definition, deferred execution, query execution, and type of data source. IEnumerable
is a base interface that represents a non-generic collection of elements that can be enumerated, while IQueryable
extends IEnumerable
and represents a collection of elements that can be queried using a query language. IEnumerable
uses deferred execution, while IQueryable
uses deferred execution with query optimization. IEnumerable
executes the query on the client side, while IQueryable
executes the query on the server side. IEnumerable
is typically used with in-memory collections, while IQueryable
is typically used with remote data sources.
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