这个异步 Lambda Cryptica 代码是否符合我的想法？

发布于 2024-07-22 02:49:43 字数 387 浏览 2 评论 0原文

    Action<SPItemEventProperties> deleteAction = DeleteWorkspace;
    AsyncCallback deleteDone = deleteAction.EndInvoke;
    SPSecurity.RunWithElevatedPrivileges(() => deleteAction.BeginInvoke(properties, deleteDone, null));

所以这应该异步调用DeleteWorkspace，然后在完成后调用EndInvoke，我写了它，但我不确定它会正常工作。我逐步执行，它似乎可以工作，但语法让我自己重新猜测，因为我从未在网上看到过这样的操作...

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原文

    Action<SPItemEventProperties> deleteAction = DeleteWorkspace;
    AsyncCallback deleteDone = deleteAction.EndInvoke;
    SPSecurity.RunWithElevatedPrivileges(() => deleteAction.BeginInvoke(properties, deleteDone, null));

So this is suppose to call DeleteWorkspace Asynchronously and then call EndInvoke when its done, I wrote it but I am not positive it will work properly. I stepped through and it appears to work but the syntax is making me second guess myself cause I have never seen it done like this on the net...

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寂寞美少年 2024-07-29 02:49:43

它应该可以工作，但要真正理解它，让我们假设它是这样写的：

void RunAsync<T>(Action<T> action)
{
    AsyncCallback Done = action.EndInvoke;
    SPSecurity.RunWithElevatedPrivileges(() => action.BeginInvoke(properties, Done, null));
}

RunAsync(DeleteWorkspace);

请注意，在上面的代码中，看起来“完成”回调将立即超出范围。但是，编译器将使用闭包捕获（关闭）它，以便在需要时可用。

It should work, but to really understand it let's pretend it were written like this:

void RunAsync<T>(Action<T> action)
{
    AsyncCallback Done = action.EndInvoke;
    SPSecurity.RunWithElevatedPrivileges(() => action.BeginInvoke(properties, Done, null));
}

RunAsync(DeleteWorkspace);

Note that in the code above, it looks like the 'Done' callback will go out of scope right away. However, the compiler will capture (close over) it with a closure, so that it's available when needed.

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