C# 中的 CATCH 块中的 GOTO 最终执行了吗？

Question

很简单的问题：

int retryAttempts = 3;

retry:
try {
    await getSemaphore();
    throw new Exception();
}
catch {
    if (0 > retryAttempts--) {
        await Task.Delay(5000);
        goto retry;
    }

    return;
}
finally {
    releaseSemaphore();
}

在这个例子中，信号量会被释放一到三次吗？

Answer 1

finally 将在您每次离开 catch 块时执行。所以在你的情况下 releaseSemaphore() 将被调用三次（在每个 goto 之后）。

我也邀请你阅读关于try-finallyhere

的官方文档

Answer 2

C# 规范 (ECMA-334) states as follows:

A goto statement is executed as follows:

If the goto statement exits one or more try blocks with associated finally blocks, control is initially transferred to the finally block of the innermost try statement. When and if control reaches the end point of a finally block, control is transferred to the finally block of the next enclosing try statement. This process is repeated until the finally blocks of all intervening try statements have been executed.

Control is transferred to the target of the goto statement.

因此 goto 仅在所有相关 finally 块执行后发生。

C# 中的 CATCH 块中的 GOTO 最终执行了吗？

Does GOTO in CATCH block in c# execute FINALLY?

c#

goto

try-catch

try-catch-finally