How do I add items to an IEnumerable list?

How do I add items to an IEnumerable list?

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”);

How can I add an item to a IEnumerable T collection?

You can’t add an item to an IEnumerable<T> . Concat creates a new instance. As you can see, the original enumeration – which we saved in original didn’t change. Since IEnumerable is read-only, you need to convert to list.

Is it possible to use Add or AddRange method on IEnumerable C#?

AddRange(IEnumerable) Method is used to add the elements of the specified collection to the end of the List. Properties of List: It is different from the arrays. A list can be resized dynamically but arrays cannot.

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 .

What is IEnumerable in C# Geeksforgeeks?

What is IEnumerable in 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.

Can you add to IEnumerable?

IEnumerable is an interface. You can’t use Add() on an IEnumerable because they’re not required to implement an Add() method. See the IEnumerable documentation on MSDN. Instead, create a generic list which inherits from the interface IList.

How do I update a single column in LINQ?

1. create your query which will return what you want from the db using your where clause.
2. Makes your changes in your code.
3. Submit your changes.

How do I know if IEnumerable has an item?

Use Any() Instead of Count() To See if an IEnumerable Has Any Objects. An IEnumerable is an implementation that supports simple iteration using an enumerator. If you use LINQ you may see yourself using IEnumerable s often.

What is IEnumerable in C# with example?

IEnumerable interface is a generic interface which allows looping over generic or non-generic lists. IEnumerable interface also works with linq query expression. IEnumerable interface Returns an enumerator that iterates through the collection.

Does list implement 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 .

How to add an item to an IEnumerable?

IEnumerable is immutable collection, it means you cannot add, or remove item. Instead, you have to create a new collection for this, simply to convert to list to add: Show activity on this post. But you need to be more careful with your terminology. You can’t add an item to an IEnumerable .

Should I use IEnumerable or IList for data collection?

Otherwise you can use IList (or List) if you want to change the collection. I use IEnumerable only for methods params when I need to read and IList (or List) when I need to change items in it. Thanks for contributing an answer to Stack Overflow!

What is the use of IEnumerable in LINQ?

IEnumerable is meant for querying collections only. It is the backbone for the LINQ framework. It is always an abstraction of some other collection such as Collection , List , or Array.

Can I add an item to a list of variables?

If the type of your variable were List rather than IEnumerable , you would be able to do whatever you wanted to the list you received, including adding items to it, just like you could do with any other list.