Question

仅仅说出throw;和throw ex;之间是否有区别，假设ex是你正在捕捉的例外？

Answer 1

throw ex;将清除您的堆栈跟踪。除非你想清除堆栈跟踪，否则不要这样做。只需使用throw;

即可

Answer 2

这是一个简单的代码片段，有助于说明差异。不同之处在于throw ex将重置堆栈跟踪，就好像“throw ex;”行是异常的来源。

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

Answer 3

你有两个选择;或者将原始异常作为新异常的内部异常抛出。根据您的需要而定。

在ASP.NET C中抛出异常＃

3 个答案: