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Cloning a Collection

Is there a command to shallow clone a collection (e.g. Collection<int>)?

I know you can manually copy the objects the one collection into the other, but is there a quicker way (i.e. a command)


Thanks
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fred2k3
Asked:
fred2k3
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1 Solution
 
ozymandiasCommented:
Collections will have a propected method MemberwiseClone() which is inherited from object.
If you create a class derived from a collection you could implement a Clone() method by exposing this.
Alternatviely use the CopyTo method of the ICollection interface or the ToArray() method.
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ozymandiasCommented:
Quick example :

using System;
using System.Collections.Generic;

namespace ConsoleApplication1 {

      class ClonableList<T> : List<T>{

            public object Clone(){
                  return this.MemberwiseClone();
            }
      }

      class Program {
            static void Main(string[] args) {

                  ClonableList<int> list1 = new ClonableList<int>();
                  list1.Add(1);
                  list1.Add(2);
                  list1.Add(3);
                  list1.Add(4);
                  ClonableList<int> list2 = (ClonableList<int>)list1.Clone();
                  foreach (int i in list2) {
                        Console.WriteLine(i.ToString());
                  }
                  Console.ReadLine();

            }
      }
}
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gregoryyoungCommented:
the collections also provide a copy constructor ...

Collection<int> test = new Collection<int>(SomeOtherCollection);

btw: int is probably a bad example since as it is a value type one could technically call this a deep copy ;-)
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fred2k3Author Commented:

To ozymandias thanks for the solution.

To Gregory You solution doesn't work since after performing the initialisation of test ,if you add an object to SomeOtherCollection the object is also added to the test Collecetion.

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gregoryyoungCommented:
whoops for collection<T> when passed an IList creates a wrapper .. list<T> does a shallow copy.

Cheers,

Greg
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fred2k3Author Commented:
thanks
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