I have a list of all integer array in which i want to check whether the list has same value i.e -1.
for ex.
int[] intk= {-1,-1,-1,-1,-1,-1};
int[] intl = { -1, -1, -1, -1, -1, -1 };
List<int[]> lst = new List<int[]>();
lst.Add(intk);
lst.Add(intl);
how to find lst has only -1 only.
Flatten your list with SelectMany and then check if all are same:
int value = -1;
bool allSame = lst.SelectMany(a => a).All(i => i == value);
You can check that using the .All(...) extension method bundled with LINQ.
In order to create a list with both array items, you should use .AddRange(...) and the T parameter of List<T> should be int instead of int[]:
int[] intk= {-1,-1,-1,-1,-1,-1};
int[] intl = { -1, -1, -1, -1, -1, -1 };
List<int> lst = new List<int>();
lst.AddRange(intk);
lst.AddRange(intl);
And now you'll be able to use .All(...):
bool result = lst.All(item => item == 1);
...or:
bool result = lst.All(item => item == -1);
This will work if you want to check to any same values not only -1.
var l = lst.SelectMany(_ => _);
bool areSame = l.All(_ => l.FirstOrDefault() == _);
