Array.Sort Method (Array, IComparer)
Assembly: mscorlib (in mscorlib.dll)
array is null.
array is multidimensional.
comparer is null, and one or more elements in array do not implement the IComparable interface.
The implementation of comparer caused an error during the sort. For example, comparer might not return 0 when comparing an item with itself.
If comparer is null, each element of array must implement the IComparable interface to be capable of comparisons with every other element in array.
If the sort is not successfully completed, the results are undefined.
This method uses the QuickSort algorithm. This implementation performs an unstable sort; that is, if two elements are equal, their order might not be preserved. In contrast, a stable sort preserves the order of elements that are equal.
On average, this method is an O(n log n) operation, where n is the Length of array; in the worst case it is an O(n ^ 2) operation.