ArrayList or List in C#: Which Collection Should You Choose?

C#collection type: The depth of the depth of arraylist and list

In C#development,

and

are two commonly used collection types. Both are used to store and manage data, but there are differences in some key areas. ArrayList List<T> Type security

and The main difference is type security.

is a non -generic collection that can store any type of object. This flexibility is at the cost of sacrifice type safety: every time you access or modify the elements in the

, the type conversion must be performed. ArrayList List<T> In contrast, ArrayList is a generic collection. By specified type parameters , it forced the execution of a strong type to ensure that all elements in the set are the same type. This eliminates the needs of type conversion, providing type security and reducing the risk of error. ArrayList

Performance and efficiency

List<T> Although the non -generic characteristics of T ​​provide flexibility, it may also lead to performance expenses. Each element access or modification related type conversion process may become a performance bottleneck, especially in large sets.

Due to its strong type characteristics, this cost is avoided. It directly stores elements in memory without type conversion. This improves performance and reduces the execution time, which is particularly obvious for the type of value. Simple and expression

ArrayList In addition to the safety and efficiency of generics, there are many other benefits.

It can be used with language integration query (Linq), which is a powerful tool for querying and conversion data. Because the compiler can automatically infer the type and handle the type of security operation, the use of

and Linq is very direct and expressive. List<T>

Lack of these advantages, cannot be used with Linq without the additional type conversion and type inspection. This may make the code more lengthy and difficult to maintain.

Conclusion

In the development of modern C#, List<T> Due to its strong types, improved performance, and expressive power enhanced through Linq, it is better than the List<T> choice. Although

may still be necessary to be compatible with the old code, it is strongly recommended that developers migrate to

among all new projects. ArrayList

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