我好奇的是，其中 Type.GetType（）实现，所以我把偷看的组装，并注意到 Type.GetType（ ）电话 base.GetType（）键，因为键入从继承的MemberInfo 我接过来一看，它被定义为 _MemberInfo.GetType（）返回 this.GetType（）。因为我无法找到实际的code，显示了C＃可以获得类型的信息，我想知道：

I got curious as to where Type.GetType() is implemented, so I took a peek at the assembly and noticed Type.GetType() calls base.GetType() and since Type inherits from MemberInfo I took a look and it is defined as _MemberInfo.GetType() which returns this.GetType(). Since I cannot find the actual code that shows how C# can get type information I would like to know:

如何从对象的CLR GET类型和的MemberInfo在运行？

How does the CLR get Type and MemberInfo from objects at Runtime?

推荐答案

下面的实际源用于.NET Framework 2.0，可在Internet（用于教育目的）上：的 http://www.microsoft.com/en-us/download/details.aspx?id=4917

The ACTUAL source for .NET Framework 2.0 is available on the internet (for educational purposes) here: http://www.microsoft.com/en-us/download/details.aspx?id=4917

这是C＃语言实现。你可以使用7zip的来解压。您将在这里找到的反射命名空间（相对）：

This is the C# Language implementation. You can use 7zip to unpack it. You will find the reflection namespace here (relatively):

sscli20 CLR的 src BCL SYSTEM 反射

.sscli20clrsrcbclsystemreflection

我挖你问一下具体的实现，但这是一个好的开始。

I am digging for the specific implementation you are asking about, but this is a good start.

更新：很抱歉，但我认为它是一个死胡同。 Type.GetType（）调用基实现它来源于System.Object的。如果你检查了$ C $的CFile（。 sscli20 CLR的 src BCL SYSTEM object.cs ），你会发现该方法为extern （见下面code）。进一步检查可能发现的实施，但它不是在BCL。我怀疑它会在C ++ code的地方。

UPDATE: Sorry, but I think its a dead end. Type.GetType() calls to the base implementation which comes from System.Object. If you inspect that codefile (.sscli20clrsrcbclsystemobject.cs) you will find the method is extern (see code below). Further inspect could uncover the implementation, but its not in the BCL. I suspect it will be in C++ code somewhere.

// Returns a Type object which represent this object instance.
// 
[MethodImplAttribute(MethodImplOptions.InternalCall)]
public extern Type GetType();

更新（再次）：我进一步挖掘，最终发现在CLR虚拟机本身的实现答案。 （它在C ++中）。

UPDATE (AGAIN): I dug deeper and found the answer in the implementation of the CLR virtual machine itself. (Its in C++).

第一块拼图是在这里：

sscli20 CLR的 src 虚拟机 ecall.cpp

sscli20clrsrcvmecall.cpp

在这里，我们看到了code映射到一个C ++函数的外部调用。

Here we see the code that maps the external call to an C++ function.

FCFuncStart(gObjectFuncs)
    FCIntrinsic("GetType", ObjectNative::GetClass, CORINFO_INTRINSIC_Object_GetType)
    FCFuncElement("InternalGetHashCode", ObjectNative::GetHashCode)
    FCFuncElement("InternalEquals", ObjectNative::Equals)
    FCFuncElement("MemberwiseClone", ObjectNative::Clone)
FCFuncEnd()

现在，我们需要去寻找 ObjectNative ::的getclass ...这是在这里：

Now, we need to go find ObjectNative::GetClass ... which is here:

sscli20 CLR的 src 虚拟机 comobject.cpp

sscli20clrsrcvmcomobject.cpp

和这里是实施的GetType ：

    FCIMPL1(Object*, ObjectNative::GetClass, Object* pThis)
{
    CONTRACTL
    {
        THROWS;
        SO_TOLERANT;
        DISABLED(GC_TRIGGERS); // FCallCheck calls ForbidenGC now
        INJECT_FAULT(FCThrow(kOutOfMemoryException););
        SO_TOLERANT;
        MODE_COOPERATIVE;
    }
    CONTRACTL_END;

    OBJECTREF   objRef   = ObjectToOBJECTREF(pThis);
    OBJECTREF   refType  = NULL;
    TypeHandle  typeHandle = TypeHandle();

    if (objRef == NULL) 
        FCThrow(kNullReferenceException);

    typeHandle = objRef->GetTypeHandle();
    if (typeHandle.IsUnsharedMT())
        refType = typeHandle.AsMethodTable()->GetManagedClassObjectIfExists();
    else
        refType = typeHandle.GetManagedClassObjectIfExists();

    if (refType != NULL)
        return OBJECTREFToObject(refType);

    HELPER_METHOD_FRAME_BEGIN_RET_ATTRIB_2(Frame::FRAME_ATTR_RETURNOBJ, objRef, refType);

    if (!objRef->IsThunking())
        refType = typeHandle.GetManagedClassObject();
    else
        refType = CRemotingServices::GetClass(objRef);
    HELPER_METHOD_FRAME_END();

    return OBJECTREFToObject(refType);
}
FCIMPLEND

最后一件事，对 GetTypeHandle 以及其他一些辅助功能的实现可以在这里找到：

One last thing, the implementation of GetTypeHandle along with some other supporting functions can be found in here:

sscli20 CLR的 src 虚拟机 object.cpp

sscli20clrsrcvmobject.cpp