C# Merging 2 dictionaries

Question

I\'m developing an app in C# targeting .NET 3.5. In it, I have 2 similar dictionaries that contain validation criteria for a specific set of elements in my app. Both dicti

Answer 1

If your going to do this a lot, then I'd recommend writing an equality comparer for dictionary keys:

private class KeyEqualityComparer : IEqualityComparer>
{
    public bool Equals(KeyValuePair x, KeyValuePair y)
    {
        return x.Key.Equals(y.Key);
    }

    public int GetHashCode(KeyValuePair obj)
    {
        return obj.Key.GetHashCode();
    }
}

And then whenever you need to merge dictionaries, you can do the following

var comparer = new KeyEqualityComparer();
dict1 = dict1.Union(dict2,comparer).ToDictionary(a => a.Key, b => b.Value);