C# 异步/等待异常处理模式
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原文地址: http://stackoverflow.com/questions/19148452/
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async/await exception handling pattern
提问by user1231595
I have the following reoccurring try/catch pattern in my code. Using a try/catch block to handle any exceptions thrown when calling a method in orionProxy.
我的代码中有以下重复出现的 try/catch 模式。使用 try/catch 块来处理调用 orionProxy 中的方法时抛出的任何异常。
async private void doGetContacts()
{
try {
currentContacts = await orionProxy.GetContacts (); // call method in orionProxy
ShowContacts (); // do something after task is complete
}
catch (Exception e) {
orionProxy.HandleException (e); // handle thrown exception
}
}
What I would like to write is something like the following.
我想写的是如下内容。
async private void doGetContacts()
{
currentContacts = await orionProxy.CheckForException(orionProxy.GetContacts ());
ShowContacts (); // do something after task is complete but shouldn't run on exception
}
Any pointers/suggestions? I've tried various forms of Actions/Tasks/Lambdas but nothing will properly trap the exception in orionProxy.CheckForException(?) so ShowContacts doesn't run.
任何指示/建议？我已经尝试了各种形式的 Actions/Tasks/Lambdas，但没有任何东西可以正确地捕获 orionProxy.CheckForException(?) 中的异常，因此 ShowContacts 不会运行。
采纳答案by Stephen Cleary
I don't see why it wouldn't work, assuming GetContactsis an asyncmethod:
我不明白为什么它不起作用，假设GetContacts是一种async方法：
public async Task<T> CheckForExceptionAsync<T>(Task<T> source)
{
try
{
return await source;
}
catch (Exception ex)
{
HandleException(ex);
return default(T);
}
}
On a side note, you should avoid async void(as I describe in my MSDN article) and end your asyncmethod names with the Asyncsuffix.
在一个侧面说明，你应该避免async void（正如我在MSDN文章介绍），并结束您async与方法名Async后缀。
