在ASP.NET C中引发异常#

throw ex; 将擦除StackTrace。除非要清除stacktrace,否则不要执行此操作。只使用 throw;

下面是一个简单的代码片段,它将有助于说明差异。不同的是,throw-ex将重置堆栈跟踪,就像行一样” throw ex; “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:未实现方法或操作。
at StackOverflowMess.Program.TestMethod() in Program.cs:line 9
at StackOverflowMess.Program.Main(String[] args) in Program.cs:line 43

您有两个选项:抛出;或者将原始异常作为新异常的innerException抛出。取决于你需要什么。