Question

I have two ArrayLists of different lengths. One contains ints, the other contains objects containing an int field. I want to check if any values from the list of ints appear as values of the int fields in any of the objects in the second list: eg. if

intList[i] == objList[j].value

for any i or j.

I’m using .NET 2.0, so I can’t use LINQ. Thanks!

Answer 1

Since HashSet<int> does not exists in 2.0 (if I remember correctly) use Dictionary.

Dictionary<int, object> dic = new Dictionary<int, object>(objList.Count);
foreach (object obj in objList)
    dic.Add(obj.value, null);
bool found = false;
foreach (int i in intList)
{
    if(dic.ContainsKey(i))
    {
        found = true;
        break;
    }
}