How do you declare an IEnumerable string?
You can create a static method that will return desired IEnumerable like this : public static IEnumerable CreateEnumerable(params T[] values) => values; //And then use it IEnumerable myStrings = CreateEnumerable(“first item”, “second item”);//etc..
What is IEnumerable string?
IEnumerable is an interface defining a single method GetEnumerator() that returns an IEnumerator interface. It is the base interface for all non-generic collections that can be enumerated. This works for read-only access to a collection that implements that IEnumerable can be used with a foreach statement.
What is IEnumerable string C#?
IEnumerable in C# is an interface that defines one method, GetEnumerator which returns an IEnumerator interface. This allows readonly access to a collection then a collection that implements IEnumerable can be used with a for-each statement.
How do you add an IEnumerable?
What you can do is use the Add extension method to create a new IEnumerable with the added value. var items = new string[]{“foo”}; var temp = items; items = items.Add(“bar”);
Why do we use IEnumerable in C#?
IEnumerable interface is used when we want to iterate among our classes using a foreach loop. The IEnumerable interface has one method, GetEnumerator, that returns an IEnumerator interface that helps us to iterate among the class using the foreach loop.
Is a List An IEnumerable?
List implements IEnumerable, but represents the entire collection in memory. LINQ expressions return an enumeration, and by default the expression executes when you iterate through it using a foreach, but you can force it to iterate sooner using .
What is the purpose of an IEnumerable?
IEnumerable is a standard interface that enables iterating over collections that supports it (in fact, all collection types I can think of today implements IEnumerable). Compiler support allows language features like foreach . In general terms, it enables this implicit iterator implementation.
Why do we need IEnumerable in C#?
IEnumerable is best to query data from in-memory collections like List, Array etc. Using IEnumerable we can find out the no of elements in the collection after iterating the collection. IEnumerable supports deferred execution. IEnumerable supports further filtering.
What is difference between List and IEnumerable in C#?
One important difference between IEnumerable and List (besides one being an interface and the other being a concrete class) is that IEnumerable is read-only and List is not. So if you need the ability to make permanent changes of any kind to your collection (add & remove), you’ll need List.
Is array IEnumerable C#?
All arrays implement IList, and IEnumerable.
Can you modify IEnumerable?
IEnumerable is readonly. You can not modify it. If you want to modify collection, then consider to change it to List .
How do you initialize an IEnumerable object?
IEnumerable is just an interface and so can’t be instantiated directly. IEnumerable<string> m_oEnum = new List>() { “1”, “2”, “3” }; you can then pass this to anything expecting an IEnumerable . You cannot instantiate an interface – you must provide a concrete implementation of IEnumerable.