Question

I have a List<> in my program, filled with my custom class. I want to be able to extract an object from the list by simply specifying an integer, then returning all objects that have an integer property set to that integer. I was thinking of doing it like this:

int exampleint = 5; List<MyClass> extract = new List<MyClass>(); for(int i = 0; i < list.Length; i++) {     if(list[i].Number == exampleint)         extract.Add(list[i]); } return extract; 

Is there any better or faster way do do this? Just wondering.

Update: Chris, your answer was a little off. This:

 List<MyClass> extract = list.FindAll(delegate(int obj) { return obj.Number == exampleint; }); 

should in fact be this:

List<MyClass> extract = list.FindAll(new Predicate<MyClass>(delegate(MyClass obj) { return obj.Number == exampleint; })); 

Your first example gave me errors. But thanks for pointing me in the right direction, it seems to work now.

Answer 1

List<MyClass> extract = list.FindAll(obj => obj.Number == exampleint); 

OR (if you’re using .NET 2.0 and can’t use expressions)

List<MyClass> extract = list.FindAll(delegate(MyClass obj) { return obj.Number == exampleint; });