如何声明和等待异步委托?
How to declare and await an async delegate?
出于某种原因,尽管这个问题在我的谷歌搜索中出现了很多次,但我似乎找不到真正的答案。也许我只是错误地使用了代表,我不确定。如果这是一个 X-Y 问题,我很高兴有其他处理方法。
假设我有这个:
public class SomeLibrary
{
public delegate void OnSomethingHappened(EventInfo eventInfo);
public OnSomethingHappened onSomethingHappened;
public void SomeMethod()
{
// ...
// Something happened here, so we'd better trigger the event
onSomethingHappened?.Invoke(eventInfo);
// ...
}
}
public class MyCode
{
public void SomeInitialisationMethod()
{
SomeLibrary someLibrary = new SomeLibrary();
someLibrary.onSomethingHappened += SomeEventHandler;
}
private void SomeEventHandler(EventInfo eventInfo)
{
DoSyncProcessing(eventInfo);
}
}
应该没问题(除了愚蠢的拼写错误)。
现在想象一下我的常规同步 DoSyncProcessing
函数突然变成了异步的,就像在这个神奇的非功能代码中一样:
public class SomeLibrary
{
public async delegate Task OnSomethingHappened(EventInfo eventInfo); // <<< IDK what I'm doing here!
public OnSomethingHappened onSomethingHappened;
public void SomeMethod()
{
// ...
// Something happened here, so we'd better trigger the event
await onSomethingHappened?.Invoke(eventInfo); // <<< IDK what I'm doing here either!
// ...
}
}
public class MyCode
{
public void SomeInitialisationMethod()
{
SomeLibrary someLibrary = new SomeLibrary();
someLibrary.onSomethingHappened += SomeEventHandler;
}
private async Task SomeEventHandler(EventInfo eventInfo)
{
await DoAsyncProcessing(eventInfo);
}
}
我该如何处理?正确的做法是什么?
async
修饰符影响方法实现,而不是签名。所以改变这个:
public async delegate Task OnSomethingHappened(EventInfo eventInfo);
为此:
public delegate Task OnSomethingHappened(EventInfo eventInfo);
您的代码将起作用。
出于某种原因,尽管这个问题在我的谷歌搜索中出现了很多次,但我似乎找不到真正的答案。也许我只是错误地使用了代表,我不确定。如果这是一个 X-Y 问题,我很高兴有其他处理方法。
假设我有这个:
public class SomeLibrary
{
public delegate void OnSomethingHappened(EventInfo eventInfo);
public OnSomethingHappened onSomethingHappened;
public void SomeMethod()
{
// ...
// Something happened here, so we'd better trigger the event
onSomethingHappened?.Invoke(eventInfo);
// ...
}
}
public class MyCode
{
public void SomeInitialisationMethod()
{
SomeLibrary someLibrary = new SomeLibrary();
someLibrary.onSomethingHappened += SomeEventHandler;
}
private void SomeEventHandler(EventInfo eventInfo)
{
DoSyncProcessing(eventInfo);
}
}
应该没问题(除了愚蠢的拼写错误)。
现在想象一下我的常规同步 DoSyncProcessing
函数突然变成了异步的,就像在这个神奇的非功能代码中一样:
public class SomeLibrary
{
public async delegate Task OnSomethingHappened(EventInfo eventInfo); // <<< IDK what I'm doing here!
public OnSomethingHappened onSomethingHappened;
public void SomeMethod()
{
// ...
// Something happened here, so we'd better trigger the event
await onSomethingHappened?.Invoke(eventInfo); // <<< IDK what I'm doing here either!
// ...
}
}
public class MyCode
{
public void SomeInitialisationMethod()
{
SomeLibrary someLibrary = new SomeLibrary();
someLibrary.onSomethingHappened += SomeEventHandler;
}
private async Task SomeEventHandler(EventInfo eventInfo)
{
await DoAsyncProcessing(eventInfo);
}
}
我该如何处理?正确的做法是什么?
async
修饰符影响方法实现,而不是签名。所以改变这个:
public async delegate Task OnSomethingHappened(EventInfo eventInfo);
为此:
public delegate Task OnSomethingHappened(EventInfo eventInfo);
您的代码将起作用。