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>

CodePudding user response：

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=>item.category = "All Items").ToList();

   

CodePudding user response：

You can use the Select method with a lambda expression to modify each item in the items collection, like this:

items = items.Select(x => { x.category = "All Items"; return x; });

or use Select method with an anonymous method

items = items.Select(delegate(ItemList x) { x.category = "All Items"; return x; });

Or you can use ForEach method like

items.ToList().ForEach(x => x.category = "All Items");

You can also use ForEach extension method like

items.ToList().ForEach(x => x.category = "All Items");

Note that, ForEach is not a linq method, it is an extension method of List, it works on in-memory collection and executes the lambda expression for each element of the collection.