c#int 型溢出 变负数 怎么检测

static void Main(string[] args){
            try
            {
                checked
                {
                    int minValue = Int32.MinValue;
                    minValue -= 1;
                    Console.WriteLine(minValue);
                }
            }
            catch (OverflowException e)
            {
                Console.WriteLine(e.Message);
            }
            catch (Exception e)
            {
                Console.WriteLine(e.Message);
            }

            Console.ReadKey(true);
        }
    }

查一下checked的用法。