It also provides support for accessing the items from the index. This interface has more power than the preceding two interfaces. The IList interface contains the following,. The IList interface has one indexer by which we can access any element by its position and can insert an element and remove an element at any position. View All. Ritesh Sharma Updated date Nov 08, IEnumerable vs. IList Collections are used quite often in applications and C have different types of collection.
IEnumerable: Provides Enumerator for accessing collection Used where you want to store a collection of objects which will be accessed only for read-only purpose. You need to iterate through the collection, means to access an element at position 5 you first need to access objects.
Cannot modify the list i. ICollection: List can be modified and iterated i. Operations like Sort are not allowed IQueryable: a special type because it allows deferred query execution i. It is particularly used for Linq queries and in Entity Framework.
It means encapsulate your designer. Interface means a point or a node to join two parts to each other, it means making low dependency from two parts and making a joint section to make flexible change in future.
IEnumerable is suitable just for iterating through collection and you cannot modify Add or Remove data. IEnumerable brings ALL data from server to client, then filters them, assume that you have a lot of records so IEnumerable puts overhead on your memory.
Whenever we encounter huge data with so many records, we have to reduce overhead from application. IQueryable prepares high performance in such situations huge data by filtering data firstly and then sending filtered data to client. There is a tiny difference between them that if dictionary cannot find specific key will throw an exception while HashTable just returns null.
IDictionary is interface and if you estimate big changes in future, use IDictionary instead of Dictionary. It's an O 1 operation. In your code you should always expose the type that's highest in the object hierarchy that will correspond to the needs of the callers. This gives you more flexibility as you could easily swap the concrete implementation without breaking the contract. Using Ienumerable we can find out the no of elements in the collection after iterating the collection.
Stack Overflow for Teams — Collaborate and share knowledge with a private group. Create a free Team What is Teams? Collectives on Stack Overflow. Learn more. Asked 7 years, 11 months ago. Active 2 years, 7 months ago. Viewed 27k times. I need to know what the differences between these types are: List IList IEnumerable What are the differences for each one in comparison with the others?
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