c# - Linq, determine if list are equals

Question

How to determine, if items in a List<List<int>> are equals ?

List<List<int>> equals = new List<List<int>>()
{
    new List<int>() { 1,2 },
    new List<int>() { 1,2 }
};

List<List<int>> notEquals = new List<List<int>>()
{
    new List<int>() { 1,2 },
    new List<int>() { 2,500}
};

Answer 1

You need to compare the first list with all others, you can use SequenceEqual:

List<int> first = yourLists[0];
bool allEqual = yourLists.Skip(1).All(l => first.SequenceEqual(l));

Since All returns false on the first unequal list this is pretty efficient.