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Asked: 2026-06-09T00:23:23+00:00

Any LINQ solutions (preferably) would be appreciated. I need the duplicate values upon concatenating

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Any LINQ solutions (preferably) would be appreciated. I need the duplicate values upon concatenating both.

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  1. Editorial Team

    If you want to find out which items are in both lists, you need to use the Enumerable.Intersect() method. 

        var list1 = new List<KeyValuePair<string,string>>();
    var list2 = new List<KeyValuePair<string,string>>();

    list1.Add(new KeyValuePair<string,string>("key1", "value1"));
    list1.Add(new KeyValuePair<string,string>("key2", "value2"));
    list2.Add(new KeyValuePair<string,string>("key1", "value1"));
    list2.Add(new KeyValuePair<string,string>("key3", "value3"));

    var inBothLists = list1.Intersect(list2); // contains only key1,value1

    There are two overloads, one takes an IEqualityComparer<T> so in the event that the default one does not perform the comparison the way you want, you can write and provide your own.

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