[英]Why is my custom exception wrapped by an AggregatException. What does this depend on?
I have the following custom exception :我有以下自定义异常:
public class MyCustomException : Exception
{
public MyCustomException(string message) : base(message)
{ }
}
I throw it at this point:我在这一点上抛出它:
private async Task<string> AquireToken()
{
string url = GetUrl("authentication/connect/token");
//...
private static string GetUrl(string relativeUrl)
{
var baseUrl = Environment.GetEnvironmentVariable("BASE_URL");
if (string.IsNullOrEmpty(baseUrl))
{
throw new MyCustomException("Address is not set in Enviroment Variable (BASE_URL)");
}
var fullUrl = $"{baseUrl.Trim('/')}/{relativeUrl}";
return fullUrl;
}
But when testing, I find that it is wrapped by an AggregateException, the test fails:但是测试的时候发现被一个AggregateException包裹了,测试失败:
MyCustomException exception = await Assert.ThrowsAsync<MyCustomException>(async () =>
{
Environment.SetEnvironmentVariable("BASE_URL", null);
await serviceUnderTest.SampleMethod(input);
});
Assert.Throws() Failure
Expected: typeof(SAMPLECOMPANY.SAMPLEPROJECT.SampleMicroservice.WebApi.Service.Exceptions.MyCustomException)
Actual: typeof(System.AggregateException): One or more errors occurred. (Address is not set in Enviroment Variable (BASE_URL))
---- System.AggregateException : One or more errors occurred. (Address is not set in Enviroment Variable (BASE_URL))
-------- SAMPLECOMPANY.SAMPLEPROJECT.SampleMicroservice.WebApi.Service.Exceptions.MyCustomException : Address is not set in Enviroment Variable (BASE_URL)
At other places in the same class I throw it too (for example in the method SampleMethod()
that calls AquireToken()
and, there I only get the custom exception.在同一个类的其他地方,我也抛出了它(例如,在调用
AquireToken()
的方法SampleMethod()
中,我只得到自定义异常。
I am confused, because in other projects I do supposedly analogous and there the exceptions are not wrapped....我很困惑,因为在其他项目中我做了类似的事情,并且没有包装异常......
What does it depend on, if the exception of AggregateException is wrapped or not, how can I avoid it?它取决于什么,如果包裹了 AggregateException 的异常,我怎样才能避免它?
You are starting a task here by using await/aync and you are not handling exception.您在此处使用 await/aync 开始一项任务,并且您没有处理异常。 That is why you are getting aggregate exception.
这就是为什么您会收到聚合异常的原因。 From MS docs
来自 MS 文档
https://docs.microsoft.com/en-us/dotnet/api/system.aggregateexception.handle?view=netframework-4.7.2 https://docs.microsoft.com/en-us/dotnet/api/system.aggregateexception.handle?view=netframework-4.7.2
MyCustomException exception = await Assert.ThrowsAsync<MyCustomException>(async () =>
{
Environment.SetEnvironmentVariable("BASE_URL", null);
await serviceUnderTest.SampleMethod(input);
});
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