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捕获Azure函数中的异步方法异常

azure-functions async-await azure c#

Pankaj Rawat · 技术社区 · 7 年前

Catch an exception thrown by an async method

我有上面讨论过的相同问题,然而,Azure函数运行方法是异步任务,其异常处理与异步void相同。不确定哪里有问题?假设这是函数SDK问题。

Azure函数

public static class PingFunction
{
    [LoggerAspect]
    [FunctionName("PingFunction")]
    public static async Task<HttpResponseMessage> Run([HttpTrigger(AuthorizationLevel.Anonymous, "get", "post", Route = null)]HttpRequestMessage req, TraceWriter log)
    {
        string name = string.Empty;
        log.Info("C# HTTP trigger function processed a request.");

            SomeService someService = new SomeService();
            await someService.DoSomething();

        return req.CreateResponse(HttpStatusCode.OK, "Hello " + name);
    }
}

public class SomeService
{
    public async Task DoSomething()
    {
        await Task.Delay(1000);
        throw new Exception("Exception from Service");
    }
}

记录器方面(MrAdvise)

public class LoggerAspectAttribute : Attribute, IMethodAdvice
{
    public void Advise(MethodAdviceContext context)
    {
        //Logger initilizer here
        Console.WriteLine($"{context.TargetType.Name} started...");
        try
        {
            context.Proceed(); // this calls the original method
        }
        catch (Exception ex)
        {
            Console.WriteLine(ex.Message);
        }
        finally
        {
            Console.WriteLine($"{context.TargetType.Name} completed...");
        }
    }
}

GetAwaiter().GetResult() ”“那么它就行了。

public static HttpResponseMessage Run([HttpTrigger(AuthorizationLevel.Anonymous, "get", "post", Route = null)]HttpRequestMessage req, TraceWriter log)
    {
        string name = string.Empty;
        log.Info("C# HTTP trigger function processed a request.");

        SomeService someService = new SomeService();
        someService.DoSomething().GetAwaiter().GetResult();

        return req.CreateResponse(HttpStatusCode.OK, "Hello " + name);
    }

Task.GetAwaiter().GetResult() methods cause the potential for deadlock issues and should be avoided in favor of async/await .

我的函数每天处理数百万个事件。如果这是FunctionSDK问题或其他问题,这是正确的解决方案吗?

1 回复 | 直到 7 年前

picrap 7 年前

您需要编写异步建议,例如:

public class LoggerAspectAttribute : Attribute, IMethodAsyncAdvice
{
    public async Task Advise(MethodAsyncAdviceContext context)
    {
        //Logger initilizer here
        Console.WriteLine($"{context.TargetType.Name} started...");
        try
        {
            await context.ProceedAsync(); // this calls the original method
        }
        catch (Exception ex)
        {
            Console.WriteLine(ex.Message);
        }
        finally
        {
            Console.WriteLine($"{context.TargetType.Name} completed...");
        }
    }
}

编辑 :是的,它与Mr Advice一起工作:)