I have this class:
public class Myclass
{
public int id;
public string name;
}
And Collection:
Collection<Myclass> myCollection = new Collection<Myclass>();
How i can sort this collection by id in place????
6 Answers
Make your class implment IComparable, and define
int CompareTo(MyClass other)
{
return Id.compareTo(other.Id);
}
Then any standard sort functions can be used.
Comments
Linq is the most straightforward way
var sorted = (from my in myCollection orderby my.id select my).ToList();
Comments
Do like this with lambda expreesion:
myCollection.Sort((a,b) => a.id.CompareTo(b.id));
If your class implements IComparable<T> in following way:
public class Myclass : IComparable<Myclass> {
public int id;
public string name;
public int CompareTo(Myclass myClass) {
return id.CompareTo(myClass.id);
}
}
Then, you directly can call Sort() method:
myCollection.Sort();
I have used myCollection as for you but indeed it do not have Sort() method....Instead, you can make your myCollection to List so that list can use Sort() method.
2 Comments
digEmAll
@AlexF: Actually this answer is not completely accurate. If you use the first line you don't need to change
MyClass (i.e. no need to implement IComparable<>). Instead, if MyClass implements IComparable<> like in the last code snippet, you can use directly myCollection.Sort() without any lambda expression. Finally, Collection<> has no method Sort(); List<> does.
Alex F
@digEmAll: you are right! I decided to use
List<T> in my project, thanks to you! I do not know why, but I thought that the collection is better than a list, but it turned out the oppositeCollection<Myclass> ss = new Collection<Myclass>();
var ordered=ss.OrderBy(s => s.id).ToList();
now order will be a list of MyClass object order by the ID
Comments
I suggest you to use List instead of Collection. For sorting you can use Linq operator OrderBy.
List<Myclass> items = new List<Myclass>();
// Add items here
items=items.OrderBy(item=>item.Id).ToList();
Comments
Collection myCl= new Collection();
var res = myCl.OrderBy(mc=>mc.Id).ToList();
Collection<T>? Can you switch toList<T>instead ?Collection<T>doesn't have theSort()method, whileList<T>does...