冒泡

 static void Main(string[] args)
        {
            int[] arr = {4, 5, 6, 1 };
            foreach (var item in arr)
            {
                Console.Write(item+"\t");
            }
           
            for (int j = 0; j < arr.Length-1; j++)
            {
                for (int i = 0; i < arr.Length - 1-j; i++)
                {
                    if (arr[i] > arr[i + 1])
                    {
                        int temp = arr[i];
                        arr[i] = arr[i + 1];
                        arr[i + 1] = temp;

                    }
                }
            }
            Console.WriteLine();
        
            foreach (var item in arr)
            {
                Console.Write(item + "\t");
            }
        }