C# Adding Multiple Elements to a IList in one line - AddRange not available

Question

I want to shorten the code and add multiple items to list at once, I get error.

"No overload method Add taking 2 arguments"

The list has some items added and i want to add new ones

IList

public IList<SelectListItem> Cmsentities { get; set; }

method

Cmsentities.Add(
            new SelectListItem
            {
                Value = "publish",
                Text = "nur veröffentlichte"
            },
            new SelectListItem
            {
                Value = "nopublish",
                Text = "nur nicht veröffentlichte"
            });

You can use `var Cmsentities = new List { new SelectListItem{}, new SelectListItem{} };` — SelvaS, Sep 08 '20 at 20:43
Thanks for reply, actually this way previously added item of list will be deleted. I want to keep those and still add more. — Amir Dora., Sep 08 '20 at 20:45
Use `AddRange()`. Example: `Cmsentities.Add(new[] { new SelectListItem(), new SelectListItem() });` — 41686d6564 stands w. Palestine, Sep 08 '20 at 20:45
You can create an extension method `Add(params SelectListItem[] items)` and use it. — SelvaS, Sep 08 '20 at 20:46
This question is in no way _about_ [tag:asp.net-core]. Do not add tags to your question except those that indicate what the question is _about_. — Peter Duniho, Sep 08 '20 at 20:51

score 0 · Answer 1 · answered Sep 08 '20 at 20:46

0

In addition to SelvaS's comment, you can also use List.AddRange(IEnumerable) Method if Cmsentities is already instantiated.

it'd look like

Cmsentities.AddRange(new List<SelectListItem> {new SelectListItem(), new SelectListItem()})

answered Sep 08 '20 at 20:46

bronzeson

71
1
8

1

`new SelectListItem[]` can perhaps also be used and avoid the creation of an instance of a generic class. – Sep 08 '20 at 20:47
3

@Olivier Or just `new[]`. – 41686d6564 stands w. Palestine Sep 08 '20 at 20:47
Since what C# language version ? – Sep 08 '20 at 20:48
1

@OlivierRogier Implicitly-typed arrays were introduced in C# 3.0 – CoolBots Sep 08 '20 at 20:54

C# Adding Multiple Elements to a IList in one line - AddRange not available

1 Answers1