问题描述
我正在通过反射调用一个可能导致异常的方法.如何在没有包装反射的情况下将异常传递给调用者?
我正在重新抛出 InnerException,但这会破坏堆栈跟踪.
示例代码:
I am calling, through reflection, a method which may cause an exception. How can I pass the exception to my caller without the wrapper reflection puts around it?
I am rethrowing the InnerException, but this destroys the stack trace.
Example code:
public void test1() { // Throw an exception for testing purposes throw new ArgumentException("test1"); } void test2() { try { MethodInfo mi = typeof(Program).GetMethod("test1"); mi.Invoke(this, null); } catch (TargetInvocationException tiex) { // Throw the new exception throw tiex.InnerException; } }
推荐答案
在 .NET 4.5 中现在有 ExceptionDispatchInfo 类.
In .NET 4.5 there is now the ExceptionDispatchInfo class.
这让您可以在不更改堆栈跟踪的情况下捕获异常并重新抛出它:
This lets you capture an exception and re-throw it without changing the stack-trace:
using ExceptionDispatchInfo = System.Runtime.ExceptionServices.ExceptionDispatchInfo; try { task.Wait(); } catch(AggregateException ex) { ExceptionDispatchInfo.Capture(ex.InnerException).Throw(); }
这适用于任何异常,而不仅仅是 AggregateException.
This works on any exception, not just AggregateException.
它是由于 await C# 语言特性而引入的,它从 AggregateException 实例中解包内部异常,以使异步语言特性更像同步语言特性.
It was introduced due to the await C# language feature, which unwraps the inner exceptions from AggregateException instances in order to make the asynchronous language features more like the synchronous language features.