C#清理C分配的内存吗？

一般来说,interop封送者和CLR遵守COM惯例来释放内存;收件人负责释放内存.因此,如果该内存返回给被管理的调用者,则CLR / Interop封送器通常将负责释放在本地调用中分配的内存.

从Memory Management with the Interop Marshaler(msdn)：

The interop marshaler always attempts
to free memory allocated by unmanaged
code. This behavior complies with COM
memory management rules,but differs
from the rules that govern native C++.

Confusion can arise if you anticipate
native C++ behavior (no memory
freeing) when using platform invoke,
which automatically frees memory for
pointers. For example,calling the
following unmanaged method from a C++
DLL does not automatically free any
memory.

The runtime always uses the CoTaskMemFree method to free memory. If the memory you are working with was not allocated with the CoTaskMemAlloc method,you must use an IntPtr and free the memory manually using the appropriate method.