c# 異常處理

嵌套

異常嵌套可一起檢查多個異常,其中一環出現異常，便停止排查余下異常

  public class TryCatch
    {
        public void Test1(int a )
        {
            try
            {
                int i = 1 / a;

                Console.WriteLine(i);
                try
                {
                    int j = i + 1;        //異常嵌套
                    Console.WriteLine(j);
                }
                catch (IndexOutOfRangeException e)
                {
                    Console.WriteLine(e.Message);
                    Console.WriteLine(e.StackTrace);


                }
            }
            catch(Exception e )   //當不知道異常種類時用Exception
            {
                Console.WriteLine(e.Message);
            }
            finally
            {
                Console.WriteLine("結果");
            }

        }
    }

多重異常處理

Argument三個異常為參數相關，需先定義一下

    public class Exceptions
    {
        public static void Text1(string name,int age,string sex)
        {
            if (string .IsNullOrWhiteSpace(name))
            {
                throw new ArgumentNullException("name"); 
            }
            if (sex!="boy" &&sex!= "girl")
            {
                throw new ArgumentException("sex");
            }
            if (age>=150 || age <=0)
            {
                throw new ArgumentOutOfRangeException("age");
            }
            Console.WriteLine(name + age + sex);
        }
}

  
            try
            {
                Exceptions.Text1("tt", 23, "boy");
                Console.WriteLine("無異常");
            }

            catch (ArgumentNullException e)
            {
                Console.WriteLine(e.Message);
                Console.WriteLine(e.StackTrace);
            }
            catch (ArgumentOutOfRangeException e)
            {
                Console.WriteLine(e.Message);
                Console.WriteLine(e.StackTrace);
            }
            catch (ArgumentException e)
            {
                Console.WriteLine(e.Message);
                Console.WriteLine(e.StackTrace);
            }