How to replace foreach with linq

Question

foreach (var item in items)
{
    item.category = "All Items";
}

How to replace the above foreach with Linq.

I have tried with following code, but it returns null for the item

_ = items.Select(x => x.item = "All Items")

Note : items is of type IEnumerable<ItemList>

LINQ is for querying data, not transforming data. Just use `foreach` - that is what it is for. — NetMage, Feb 03 '23 at 20:28

pm100 · Answer 1 · 2023-02-03T22:36:14.127

0

linq is an example of functional programming - in general it does not change the input data it reads it in and outputs new data

you can do this (assuming you have a List to start with)

 items = items.Select(item=>new {category="All Items", x=.., y=..}).ToList()

wher x and y are the other fields in ItemList

edited Feb 03 '23 at 22:36

answered Jan 30 '23 at 05:16

pm100

1

You shouldn't be using side effects in `Select` in LINQ. – NetMage Feb 03 '23 at 20:27
@NetMage - what side effect? – pm100 Feb 03 '23 at 21:24
`item.category = "All Items"` uses the assignment operator to modify the value in `item.category`. That is a side effect. – NetMage Feb 03 '23 at 22:18
@NetMage - you are quite correct - this is a garbage answer. Will fix – pm100 Feb 03 '23 at 22:33

1 Answers1