IEnumerable vs. IQueryable: When Should I Choose Which?

linq query:

and choice IEnumerable<T> IQueryable<T> When using linq query, select

or

will have a significant impact on performance and data retrieval. These two interfaces are different in processing the delayed execution, which allows optimization and efficient processing of data query. IEnumerable<T> IQueryable<T> Delayed execution: critical differences

and both support delayed execution, which means that the query will not be executed immediately when it is created. Instead, the query is expressed as an expression that can be performed in the future. However, there is a key difference between each interface processing delay execution.

IQueryable<T> : Database is not related to the query IEnumerable<T>

is an interface that enables the Linq to SQL query, which allows high -level operations to perform data sources without having to understand the underlying database. When performing inquiries with , the query provider (for Linq to SQL, this is a database engine) to convert the query and convert to optimized SQL statements. IQueryable<T> This optimized SQL statement runs on the database server, and only returns the result of matching the query conditions. If further refinement is needed, the new query will also be executed on the database, so as to maintain high performance and optimization level.

: Operation in memory IQueryable<T> IQueryable<T>

On the contrary, indicates a set of objects in memory. When the executes query, all objects that match the original query will immediately retrieve them from the data source (database in this example). Once the entire collection is loaded into the memory, any further refinement of the query is performed in memory, which may cause too much memory.

Select the correct options

IEnumerable<T> The choice of and depends on the specific requirements of the application.

• When to use : IQueryable<T>
  complex query with multiple connection and screening conditions
  Require performance optimization and reduction database load
  Large data sets that need to be paged and sorted
When to use
• : IEnumerable<T> Inquiry involved in the screening and processing in memory
  • Small data sets that can be placed in memory
  • Need to retrieve immediately and object operations
By understanding the difference between and

, developers can make wise decisions on the interfaces they want to use in their applications to ensure the best performance and efficient data processing.

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