我正在尝试捕获异步方法中抛出的自定义异常,但由于某种原因,它总是被通用异常catch块捕获.请参阅下面的示例代码
class Program
{
static void Main(string[] args)
{
try
{
var t = Task.Run(TestAsync);
t.Wait();
}
catch(CustomException)
{
throw;
}
catch (Exception)
{
//handle exception here
}
}
static async Task TestAsync()
{
throw new CustomException("custom error message");
}
}
class CustomException : Exception
{
public CustomException()
{
}
public CustomException(string message) : base(message)
{
}
public CustomException(string message,Exception innerException) : base(message,innerException)
{
}
protected CustomException(SerializationInfo info,StreamingContext context) : base(info,context)
{
}
}
解决方法
问题是Wait抛出了一个AggregateException,而不是你想要捕获的异常.
你可以用这个：
try
{
var t = Task.Run(TestAsync);
t.Wait();
}
catch (AggregateException ex) when (ex.InnerException is CustomException)
{
throw;
}
catch (Exception)
{
//handle exception here
}
