How Can I Preserve Stack Traces When Rethrowing Exceptions in C#?

Preserving stack trace when rethrowing inner exception in C#

While it is common practice to rethrow InnerException to pass the underlying exception to the caller, this can accidentally delete valuable stack trace information, hindering debugging efforts.

In C#, when a method is called via reflection and an exception occurs, a TargetInvocationException is thrown as a wrapper around the actual exception. To retrieve an inner exception, developers often just rethrow it. However, this operation will erase the stack trace information pointing to the true source of the error.

Solution using ExceptionDispatchInfo

Since .NET 4.5, the ExceptionDispatchInfo class provides a solution to this problem. It allows catching an exception and rethrowing it while retaining its stack trace. Here’s how to use it:

<code class="language-csharp">using ExceptionDispatchInfo = 
    System.Runtime.ExceptionServices.ExceptionDispatchInfo;

try
{
    // 执行可能抛出异常的方法。
    task.Wait();
}
catch (AggregateException ex)
{
    // 捕获内部异常并使用原始堆栈跟踪重新抛出它。
    ExceptionDispatchInfo.Capture(ex.InnerException).Throw();
}</code>

This method is particularly useful when unwrapping inner exceptions from an AggregateException instance after using the await C# language feature. It ensures that stack trace information is not lost during asynchronous programming.

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