什么是Array.Clear实际上在幕后做什么？ [英] What does Array.Clear actually do under the covers?

问题描述

我在寻找一个答案，在C＃在幕后的Array.Clear（...）方法做什么。

I'm looking for a answer to what the Array.Clear(...) method does under the covers in C#.

我看过的IL，但并没有真正产生任何线索，因为它只是调用的System.Array ::清除（...）方法在mscorlib中，然后调用CLR的非托管部分我不能观察到。

I've looked at the IL, but that isn't really yielding any clues, since it simply calls the System.Array::Clear(...) method in mscorlib, which then calls an unmanaged portion of the CLR that I can't observe.

我为什么问这个，究其原因是，我偶尔会收到抛出我呼吁Array.Clear的SEHException，我似乎无法找出为什么它正在发生。

The reason why I am asking this, is that I am occasionally getting an SEHException thrown by my call to Array.Clear, and I can't seem to figure out why it is happening.

不幸的是，微软似乎有点守口如瓶它可能意味着，当异常被抛出...

Unfortunately, Microsoft seems to be a little tight-lipped about what it might mean when the exception is thrown...

从：<一href="http://msdn.microsoft.com/en-us/library/system.runtime.interopservices.sehexception(v=VS.100).aspx">http://msdn.microsoft.com/en-us/library/system.runtime.interopservices.sehexception(v=VS.100).aspx

任何SEH异常不会自动映射到一个特定的异常被映射到系统默认的SEHException类。欲了解更多信息，搜索非托管例外和结构化异常处理MSDN Library中。 的

在这个任何帮助将是AP preciated ......只是点我朝着正确的方向，即使！

Any help on this would be appreciated... just point me in the right direction, even!

谢谢！

推荐答案

您可以看到在SSCLI20源$ C ​​$ C之类的code。它看起来像这样用全部去掉噪音：

You can see that kind of code in the SSCLI20 source code. Which looks like this with all the noise removed:

FCIMPL3(void, SystemNative::ArrayClear, ArrayBase* pArrayUNSAFE, INT32 iIndex, INT32 iLength)
{
    BASEARRAYREF pArray = (BASEARRAYREF)pArrayUNSAFE;
    // error checks
    //.. 
    char* array = (char*)pArray->GetDataPtr();
    int size = pArray->GetMethodTable()->GetComponentSize();
    ZeroMemory(array + (iIndex - lb) * size, iLength * size);
}

在换句话说，它简单地爆炸0字节到的元素。得到一个SEHException的唯一途径是通过处理器故障。 GC堆损坏。查看所有的PInvoke或COM互操作code。

In other words, it simply blasts 0 bytes into the elements. The only way to get an SEHException is through a processor fault. GC heap corruption. Review any pinvoke or COM interop code.

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