我希望能够做到这一点:
class MyClass
{
IRepo repo;
public MyClass(IMyRepo repo) { this.repo = repo; }
long ID { get; set; }
string Prop1 { get; set; }
string Prop2 { get; set; }
public async Task LoadAsync()
{
await Task.WhenAll(
repo.GetProp1ByIDAsync(ID).OnComplete(x => Prop1 = x),
repo.GetProp2ByIDAsync(ID).OnComplete(x => Prop2 = x)
);
}
}
当然,我似乎找不到任何标准库具有 Task
的 OnComplete
扩展。我真的需要创建自己的方法吗?或者是否有一个库已经有了这种扩展方法?我看到有 ContinueWith
但这并没有给我展开的结果,我仍然必须 await
或 .Result
它......所以那不会阻塞线程吗?暂停第二次 repo
调用直到完成?如果它不能阻止它,那为什么我得到的结果仍然是包装的,将未包装的结果返回给我会更干净吗?还是我遗漏了什么?
最佳答案
I can't seem to find any standard library that has this OnComplete extension for Task. Do I really need to create my own or is there a library that already has this extension method? I see that there's ContinueWith but that does not give me the unwrapped result, I still have to await it or .Result it... so wouldn't that block the thread?
ContinueWith
是您正在寻找的方法; Result
不会阻塞任务,因为它在回调被调用时已经完成。
但是,ContinueWith
是一个危险的低级 API。您应该改用 await
:
public async Task LoadAsync()
{
await Task.WhenAll(
LoadProp1Async(),
LoadProp2Async()
);
}
private async Task LoadProp1Async()
{
Prop1 = await repo.GetProp1ByIDAsync(ID);
}
private async Task LoadProp2Async()
{
Prop2 = await repo.GetProp2ByIDAsync(ID);
}
关于c# - 任务的 OnCompleted 回调在哪里?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/39239295/