c# 异常处理

概要

情况分析	异常后的代码	finally的代码
未+try chatch	不执行	执行
try chatch	执行	执行
提前return	-	执行

代码

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace 异常实验
{
    class A {
        public void Func() {
            Console.WriteLine("A func");
        }
    }
    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("异常实验");
            Program p = new Program();
            p.main();
            Console.ReadKey();
        }
        private void main() {
            test1();
            Console.WriteLine("");
            test2();
            Console.WriteLine("");
            test3();
            Console.WriteLine("");
            test4();
        }
        private void test1() {
            A a = null;
            try
            {
                a.Func();
            }
            catch(Exception ex)
            {
                //Console.WriteLine("ex.ToString():" + ex.ToString());
                Console.WriteLine("ex.Message:" + ex.Message);
            }
            finally {
                Console.WriteLine("finally");
            }
            Console.WriteLine("异常后面的代码");
        }
        private void test2()
        {
            Console.WriteLine("异常实验-提前return");
            A a = null;
            try
            {
                a.Func();
            }
            catch (Exception ex)
            {
                //Console.WriteLine("ex.ToString():" + ex.ToString());
                Console.WriteLine("ex.Message:" + ex.Message);
                return;
            }
            finally
            {
                Console.WriteLine("finally");
            }
            Console.WriteLine("异常后面的代码");
        }
        private void test3()
        {
            Console.WriteLine("异常实验 没有异常");
            A a = new A();
            try
            {
                a.Func();
            }
            catch (Exception ex)
            {
                //Console.WriteLine("ex.ToString():" + ex.ToString());
                Console.WriteLine("ex.Message:" + ex.Message);
                return;
            }
            finally
            {
                Console.WriteLine("finally");
            }
            Console.WriteLine("异常后面的代码");
        }
        private void test4()
        {
            try
            {
                Console.WriteLine("异常实验 外部try catch");
                A a = null;
                a.Func();
                Console.WriteLine("异常后面的代码");
            }
            catch (Exception ex) {
                
            }
        }
    }
}

运行结果