How to update an object in a List<> in C#

Question

I have a List<> of custom objects.

I need to find an object in this list by some property which is unique and update another property of this object.

What is the quickest way to do it?

Answer 1

Using Linq to find the object you can do:

var obj = myList.FirstOrDefault(x => x.MyProperty == myValue); if (obj != null) obj.OtherProperty = newValue; 

But in this case you might want to save the List into a Dictionary and use this instead:

// ... define after getting the List/Enumerable/whatever var dict = myList.ToDictionary(x => x.MyProperty); // ... somewhere in code MyObject found; if (dict.TryGetValue(myValue, out found)) found.OtherProperty = newValue;