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Is there a LINQ method to modify items in a collection, such as simply setting a property of each item in a collection? Something like this:
var items = new []{ new Item { IsActive = true } }
var items = items.Transform(i => i.IsActive = false)
where Touch enumerates each item and applies the transformation. BTW, I am aware of the SELECT extension method, but this would require I expose a method on the type that does this transformation and return the same reference.
var items = items.Select(i => i.Transform())
where Item.Transform returns does the transformation and return the same instance.
TIA
724
You can use LINQ to query any enumerable collections such as List<T>, Array, or Dictionary<TKey,TValue>. The collection may be user-defined or may be returned by a . NET API.
By using a LINQ query, you can use a source sequence as input and modify it in many ways to create a new output sequence. You can modify the sequence itself without modifying the elements themselves by sorting and grouping.
var fruit = ListOfFruits. FirstOrDefault(x => x.Name == "Apple"); if (fruit != null) { return fruit.ID; } return 0; This is not the only road to Rome, you can also use Single(), SingleOrDefault() or First().
No, there are no methods in standard LINQ that allows you to modify items in a collection. LINQ is for querying collections and not for causing side-effects (e.g., mutating the items). Eric Lippert goes into the idea in more detail in his blog post: “foreach” vs “ForEach”.
Just use a loop.
foreach (var item in items)
{
item.IsActive = false;
}
LINQ is for querying. Use a simple loop if you want to modify. Just use the right tool for the right job. LINQ is not a messiah for everything.
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