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. Types that use the IList interface must implement Add ().

Full Answer

How to insert new item into an IEnumerable?

Oct 06, 2021 · What you can do is use the Add extension method to create a new IEnumerable with the added value. items = items.Add("msg2"); Even in this case it won't modify the original IEnumerable object. This can be verified by holding a reference to it. For example. var items = new string[]{"foo"}; var temp = items; items = items.Add("bar");

How can I create an IEnumerable from an enum?

Feb 23, 2020 · Can you add to IEnumerable? No the IEnumerable doesn't support adding items to it. Not only can you not add items like you state, but if you add an item to a List (or pretty much any other non-read only collection) that you have an existing enumerator for, the enumerator is invalidated (throws InvalidOperationException from then on).

How to get the first element of IEnumerable?

Feb 17, 2011 · That said, the correct way to add items to IEnumerable is to return new IEnumerable with the new items appended to the contents of the original. Also with Linq libraries you have an extension method that allows casting your IEnumerable to a List via IEnumerable.ToList() and you can add items to a list. THis moght not be the proper way though.

How do I make this class an IEnumerable?

Nov 14, 2019 · You cannot add items to IEnumerable since this interface does not have an Add method. if TransactionSplitLines always return an instance of a List you might want to change its type to IList.

How do I update an IEnumerable object?

IEnumerable is readonly. You can not modify it. If you want to modify collection, then consider to change it to List .Apr 16, 2015

What is IEnumerable in C#?

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.Aug 9, 2018

What is IEnumerable T?

IEnumerable contains a single method that you must implement when implementing this interface; GetEnumerator, which returns an IEnumerator object. The returned IEnumerator provides the ability to iterate through the collection by exposing a Current property.

How do I add an item to 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");Jul 31, 2009

How do I get an IEnumerable element?

We can get first item values from IEnumerable list by using First() property or loop through the list to get respective element. IEnumerable list is a base for all collections and its having ability to loop through the collection by using current property, MoveNext and Reset methods in c#, vb.net.Feb 3, 2015

How do you implement IEnumerable T?

To implement IEnumerable/IEnumerable, you must provide an enumerator. You can do this in one of three ways: If the class is "wrapping" another collection, by returning the wrapped collection's enumerator. Via an iterator using yield return.

What is IEnumerable in MVC with example?

IEnumerable is an interface defining a single method GetEnumerator() that returns an IEnumerator interface. This works for read-only access to a collection that implements that IEnumerable can be used with a foreach statement. IEnumerator has two methods, MoveNext and Reset . It also has a property called Current .

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.Oct 29, 2021

Can IEnumerable be null?

5 Answers. You do not need to check if selectedRows is null . The returned IEnumerable<> might be empty, but it will never be null .

Why IEnumerable is faster than list?

IEnumerable<T> is an interface that is implemented by List<T> . So it isn't that IEnumerable<T> is more efficient than list in a "performance" or "runtime" aspect. It's that IEnumerable<T> is a more efficient design construct because it's a more specific indication of what your design requires.

What is the difference between IQueryable and IEnumerable?

Because While querying data from database, IEnumerable execute select query on server side, load data in-memory on client side and then filter data. Hence does more work and becomes slow. While querying data from database, IQueryable execute select query on server side with all filters.

What is a IEnumerator?

IEnumerator is an interface, which when implemented allows you to iterate through the list of controls. To implement it requires that you provide two methods - Reset to go back to the beginning of the list, and MoveNext to move forward, and Current to get the current item.

Question

some where part of my code, I want to add an Item to the IEnumrable.. How can I possibly add another Item of the same type of that IEnumerable to GradeProfiles?

Answers

Sorry, but I have to say that IEnumerables are only for enumerating. you can't add item to them directly and you should add the item to it's underlying source instead.

All replies

Sorry, but I have to say that IEnumerables are only for enumerating. you can't add item to them directly and you should add the item to it's underlying source instead.

Examples

The following code example demonstrates how to use Append to append a value to the end of the sequence.

Remarks

This method does not modify the elements of the collection. Instead, it creates a copy of the collection with the new element.