c# - Try-Finally 与 Thread.BeginCriticalRegion

Question

据我了解，必须在线程中止生效之前完成 finally block 。出于什么目的应该使用 Thread.BeginCriticalRegion，冒着终止 appdomain 的风险？

例子:

try
{
}
finally
{
    CriticalOperation();
}

或

Thread.BeginCriticalRegion();
CriticalOperation();
Thread.EndCriticalRegion();

Answer 1

为了让它变得非常简单，try...finally... 防止 Thread.Abort(finally 部分完全protected 且不能被中断/将始终被执行)，而 Thread.BeginCriticalRegion() 仅向 .NET 的运行时提供一些元信息:

来自 https://learn.microsoft.com/nl-nl/archive/blogs/bclteam/constrained-execution-regions-and-other-errata-brian-grunkemeyer

Critical regions don't really do much.

...

The first effect for critical regions is a way of informing the CLR that a lock is being held by a block of managed code

(注意，这只是信息……运行时做什么是它的问题。这里不能保证)

The second effect is that memory allocations within that block of code are marked as appdomain-critical.

然后它解释了运行时应该优先考虑为该代码块分配内存...所以运行时的其他元信息没有程序员的保证