Update all objects in a collection using LINQ

Is there a way to do the following using LINQ?

foreach (var c in collection)
{
    c.PropertyToSet = value;
}

To clarify, I want to iterate through each object in a collection and then update a property on each object.

My use case is I have a bunch of comments on a blog post, and I want to iterate through each comment on a blog post and set the datetime on the blog post to be +10 hours. I could do it in SQL, but I want to keep it in the business layer.

Solution 1:

While you can use a ForEach extension method, if you want to use just the framework you can do

collection.Select(c => {c.PropertyToSet = value; return c;}).ToList();

The ToList is needed in order to evaluate the select immediately due to lazy evaluation.

Solution 2:

collection.ToList().ForEach(c => c.PropertyToSet = value);

Solution 3:

I am doing this

Collection.All(c => { c.needsChange = value; return true; });

Solution 4:

I actually found an extension method that will do what I want nicely

public static IEnumerable<T> ForEach<T>(
    this IEnumerable<T> source,
    Action<T> act)
{
    foreach (T element in source) act(element);
    return source;
}

Solution 5:

Use:

ListOfStuff.Where(w => w.Thing == value).ToList().ForEach(f => f.OtherThing = vauleForNewOtherThing);

I am not sure if this is overusing LINQ or not, but it has worked for me when wanting to update a specific items in the list for a specific condition.