什么是[的DllImport（＆QUOT; QCall＆QUOT;）？

问题描述

在NET库

许多方法在本土code实现的。那些来自于框架本身都标有 [MethodImpl（MethodImplOptions.InternalCall）] 。那些来自一些非托管的DLL都标有 [的DllImport] （如 [的DllImport（KERNEL32.DLL）] ）。到目前为止，没有什么不寻常。

不过，虽然写回答另一个问题，我发现有标有很多方法[的DllImport（QCall）] 。他们似乎是净的内部实现（如 GC._Collect（））。

我的问题是：究竟 [的DllImport（QCall）] 是什么意思？在 [的DllImport（QCall）] 和 [MethodImpl（MethodImplOptions.InternalCall）]

解决方案

这是一个古老的线程。由于CoreCLR现在开源GitHub上;如果有人仍然在寻求答案，这里是<一个href="https://github.com/dotnet/coreclr/blob/0c88c2e67260ddcb1d400eb6adda19de627998f5/Documentation/mscorlib.md#calling-from-managed-to-native-$c$c">official文档：

然后继续在小标题：

• <一个href="https://github.com/dotnet/coreclr/blob/0c88c2e67260ddcb1d400eb6adda19de627998f5/Documentation/mscorlib.md#choosing-between-fcall-qcall-pinvoke-and-writing-in-managed-$c$c">Choosing FCALL，QCall，P / Invoke的，写在管理code之间
• QCall功能特性

举例：

• QCall示例 - 管理部分
• QCall示例 - 未受管理的部分

Many methods in the .Net library are implemented in native code. Those that come from the framework itself are marked with [MethodImpl(MethodImplOptions.InternalCall)]. Those that come from some unmanaged DLL are marked with [DllImport] (e.g. [DllImport("kernel32.dll")]). So far nothing unusual.

But while writing answer for another question, I discovered there are many methods marked with [DllImport("QCall")]. They seem to be internal implementation of .Net (e.g. GC._Collect()).

My question is: What exactly does [DllImport("QCall")] mean? What is the difference between [DllImport("QCall")] and [MethodImpl(MethodImplOptions.InternalCall)]?

解决方案

This is an old thread. Since CoreCLR is now open-sourced on GitHub; if someone is still seeking the answer, here is the official documentation:

And then it continues in subheadings:

• Choosing between FCall, QCall, P/Invoke, and writing in managed code
• QCall Functional Behavior

with examples:

• QCall Example - Managed Part
• QCall Example - Unmanaged Part

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