How do I convert an IList to a list?
List list = new List(); IList obj = `Your Data Will Be Here`; list = obj. ToList(); This Would Convert IList Object to List Object. The other answers all recommend to use AddRange with an IList.
Should I use list or IList?
List is used whenever you just want a generic List where you specify object type in it and that’s it. IList on the other hand is an Interface. NET to recognize it as a list. You should use the interface only if you need it, e.g., if your list is casted to an IList implementation other than List.
Does List implement IList?
I believe List implements a version of IList because it is trivial to do, and may be useful, as you wouldn’t need to wrap your list in another to pass it into another class. However it does do a type-check on any items you attempt to add and will throw if they don’t match.
How do I return an IList?
You can’t return an Interface itself – you have to return an object that implements IList . Though I don’t know exactly what your situation is, the best choice is most likely List . Note that if the object type stored in db.
Is list faster than IEnumerable?
We aren’t forcing the caller to convert their data structure to a List unnecessarily. So it isn’t that IEnumerable is more efficient than list in a “performance” or “runtime” aspect. It’s that IEnumerable is a more efficient design construct because it’s a more specific indication of what your design requires.
Should I use IList or List C#?
Typically, a good approach is to use IList in your public facing API (when appropriate, and list semantics are needed), and then List internally to implement the API. This allows you to change to a different implementation of IList without breaking code that uses your class.
Should I use IList or list C#?
What is difference between IEnumerable and IList?
An IEnumerable does not hold even the count of the items in the list, instead, you have to iterate over the elements to get the count of items. An IList can perform all operations combined from IEnumerable and ICollection, and some more operations like inserting or removing an element in the middle of a list.
Is List an ICollection?
Yes, that’s the chain. List has to implement each of those interfaces ( IList , ICollection , IEnumerable ) because of the inheritance hierarchy. For completion, IList also picks up the non-generic IList , ICollection and IEnumerable interfaces.
Is List a collection C#?
List is a collection class in C# and . NET.
When to use IList < T > instead of list?
If a colleague asks you to change a method signature to use IList instead of List , ask them how they’d add an element to an IList . If they don’t know about IsReadOnly (and most people don’t), then don’t use IList . Ever.
Which is the equivalent of a list < T >?
List equivalent of the ArrayList, which implements IList . It comes under System.Collections.Generic namespace. List can contain elements of the specified type.
Which is a Concreate implementation of the IList < T > interface?
The List is a concreate implementation of IList interface. In the object-oriented programming, it is advisable to program to interface rather than concreate class. So use IList type variable to create an object of List . However, List includes more helper methods than IList interface.
Which is an example of a list < T > class?
The following example demonstrates several properties and methods of the List generic class of type string. (For an example of a List of complex types, see the Contains method.) The parameterless constructor is used to create a list of strings with the default capacity.