假设" ex"是我们要捕获的异常，只是说" throw;"和" throw ex;"之间有区别吗？

解决方案

throw ex;将清除堆栈跟踪。除非我们要清除堆栈跟踪，否则请勿执行此操作。只需使用throw;

我们有两个选择权；或者将原始异常作为新异常的内部异常。根据需要。

这是一个简单的代码段，将有助于说明这些差异。区别在于throw ex将重置堆栈跟踪，就像" throw ex;`"行是异常的来源一样。

代码：

using System;

namespace StackOverflowMess
{
    class Program
    {
        static void TestMethod()
        {
            throw new NotImplementedException();
        }

        static void Main(string[] args)
        {
            try
            {
                //example showing the output of throw ex
                try
                {
                    TestMethod();
                }
                catch (Exception ex)
                {
                    throw ex;
                }
            }
            catch (Exception ex)
            {
                Console.WriteLine(ex.ToString());
            }

            Console.WriteLine();
            Console.WriteLine();

            try
            {
                //example showing the output of throw
                try
                {
                    TestMethod();
                }
                catch (Exception ex)
                {
                    throw;
                }
            }
            catch (Exception ex)
            {
                Console.WriteLine(ex.ToString());
            }

            Console.ReadLine();
        }
    }
}

输出(注意不同的堆栈跟踪)：

System.NotImplementedException: The method or operation is not implemented.

  at StackOverflowMess.Program.Main(String[] args) in Program.cs:line 23
  
  System.NotImplementedException: The method or operation is not implemented.

  at StackOverflowMess.Program.TestMethod() in Program.cs:line 9

  at StackOverflowMess.Program.Main(String[] args) in Program.cs:line 43