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Help finding an item within a list

I have a list of objects and before I add a new object to the list I need to see if it was already added. I tried List.Items.Contains(), but it dodnt work. Any help would be appreciated

CycleVolumeList cycleVolumeList = new CycleVolumeList();
cycleVolume = serviceClient.GetCycleVolume(Param1, Param2, Param3);

// Add it to cycleVolumeList
CycleVolume cycleVolume = new CycleVolume(item1, item2, cycleVolume );

                            if (cycleVolumeList.Items.Contains(new CycleVolume(item1, item2, cycleVolume)))
                            {
                              //do nothing  
                            }
                            else
                            {
                                cycleVolumeList.Items.Add(cycleVolume);
                            }

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dimaj

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jmpatton

ASKER

Thanks for the quick reply. Much apprieciated!

wdosanjos

For Contains to work as you expect, CycleVolume must implement System.IEquatable<T>.

IEquatable<T> Interface (System)
http://msdn.microsoft.com/en-us/library/ms131187.aspx

I hope this helps.

it_saige

Why not just use a HashSet?

http://msdn.microsoft.com/en-us/library/bb359438.aspx
http://stackoverflow.com/questions/918742/efficient-list-of-unique-strings-c

-saige-