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IEnumerable vs. List in LINQ: When Should You Use Each?

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Release: 2025-01-29 04:36:08
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IEnumerable vs. List in LINQ: When Should You Use Each?

INUMERABLE and List's choice: When will it be used?

When using Linq to build query, developers often face the choice of and

as a problem of target type. To clarify this choice, let us explore their behavior and performance differences.

IEnumerable Functional vs. Similar List

It represents an abstract concept and describes how to iterate data. It does not have a specified data storage or access method. On the other hand, is the specific implementation of , which stores data in a fixed -size array. When using , the compiler can be more flexibly delayed and optimized.

Example: Linq query and Ienumeration

IEnumerable List Consider the following linq query: IEnumerable IEnumerable

In this example, query the use of

operational symbols to return . In , internal members such as "internal" and "external" have internal members to manage inquiry and evaluation.

Delayed evaluation vs. Eager evaluation

<code class="language-csharp">IEnumerable<animal> sel =
    (from animal in Animals
     join race in Species
     on animal.SpeciesKey equals race.SpeciesKey
     select animal).Distinct();</code>
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Support delayed evaluation, which means that the actual query execution will delay when accessing data during iteration. Instead, the use of will force the query immediately to generate the

object. Distinct() IEnumerable<animal> When to use Ienumeration IEnumerable

When the following situations occur, More:

You intend to stack multiple Linq expressions to allow delayed evaluation and optimization. IEnumerable ToList() You want to avoid unnecessary processing by returning only data that needs only actual needs. List

When to use list

When the following situations occur,

is more favorable: IEnumerable

    You want to perform only one query and store the results in a fixed set.
  • You need to explicitly control the data structure for the storage results.
Performance precautions

In terms of performance, if the query executes multiple or for remote data source execution,

may be more efficient than

. However, if you need to repeatedly access the query results, List can provide better performance by avoiding multiple evaluations.

    In short, the choice between and
  • depends on the specific requirements of the code. By understanding their functional differences, developers can optimize performance and maintain the flexibility and maintenance of code.

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