[英]How to catch async void method exception?
I have an implementation like this: 我有一个这样的实现:
Task<IEnumerable<Item1>> GetItems1()
{
return RunRequest(async () => ParseItemsFromResponse(await(httpClient.Get(..))));
}
Task<IEnumerable<Item2>> GetItems2()
{
return RunRequest(async () => ParseItemsFromResponse(await httpClient.Get(..)));
}
TResult RunRequest<TResult>(Func<TResult> req)
{
try
{
return req();
}
catch (Exception ex)
{
// Parse exception here and throw custom exceptions
}
}
The issue is the void anonymous method async () => ParseItemsFromResponse(..)
. 问题是无效的匿名方法async () => ParseItemsFromResponse(..)
。
Since it returns void and not a Task
, if there's an exception thrown within the anonymous method, it's actually not going to be caught by the try
and catch
within the RunRequest
. 因为它返回void而不是Task
,所以如果在匿名方法中引发异常,则实际上不会被RunRequest
的try
和catch
。
Any suggestions how to refactor this? 有什么建议如何重构吗?
RunRequest
should take a Func<Task<TResult>>
, as such: RunRequest
应该采用Func<Task<TResult>>
,例如:
async Task<TResult> RunRequestAsync<TResult>(Func<Task<TResult>> req)
{
try
{
return await req().ConfigureAwait(false);
}
catch (Exception ex)
{
// Parse exception here and throw custom exceptions
}
}
Then your async
lambdas are converted to async Task<T>
methods instead of async void
. 然后将您的async
lambda转换为async Task<T>
方法,而不是async void
。
I have more information on sync/async delegates on my blog. 我在博客上有关于同步/异步委托的更多信息。
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