如何检查对象的ArrayList是否包含我的对象？

Question

I have an ArrayList of objects. Some of these objects are of this class:

public class NewCompactSimilar
{
    public List<int> offsets;
    public List<String> words;
    public int pageID;

    public NewCompactSimilar()
    {
        offsets = new List<int>();
        words = new List<string>();          
    }
}

But the list can also contain objects of other classes.

I need to check if my ArrayList contains an object that is identical to my object.

So, how can I do that?

Answer 1

if (words.Contains(myObject))

ArrayList has a method called Contains which checks if the Object has the same Reference than the one you have. If you want to check if the value is the same, but a different Reference, you have to Code:

private bool GetEqual(String myString)
{
    foreach (String word in words)
    {
         if (word.Equals(myString))
            return true;
    }
    return false;
}

I hope this is it :)

Answer 2

With list being your ArrayList and item being the NewCompactSimilar you are searching for:

list.OfType<NewCompactSimilar>().
                FirstOrDefault(o => o.offsets == item.offsets &&
                o.words == item.words &&
                o.pageID == item.pageID);

To run a deep equality comparison, implement the following method:

public bool DeepEquals(NewCompactSimilar other)
{
    return offsets.SequenceEqual(other.offsets) &&
            words.SequenceEqual(other.words) &&
            pageID == other.pageID;
}

Then use the following LINQ chain:

list.OfType<NewCompactSimilar>().
                FirstOrDefault(o => o.DeepEquals(item));