废话不多说,直接上源码:
1.在托管程序集里面执行方法
HRESULT CorHost2::ExecuteAssembly(DWORD dwAppDomainId,//通过CreateAppDomainWithManager创造的domainid
LPCWSTR pwzAssemblyPath,//要托管的.net core DLL 路径
int argc, //传递进来参数个数
LPCWSTR* argv,//传递进来参数数组
DWORD *pReturnValue)//指示函数执行的结果标记
{
CONTRACTL
{
THROWS; // Throws...as we do not want it to swallow the managed exception
ENTRY_POINT;
}
CONTRACTL_END;
// This is currently supported in default domain only
if (dwAppDomainId != DefaultADID) //如果不等于默认defaultADID 直接返回失败标记
return HOST_E_INVALIDOPERATION;
// No point going further if the runtime is not running...
if (!IsRuntimeActive() || !m_fStarted) //如果 coreclr host 没有在运行或者m_fstarted标记没有被启动,返回失败标记
{
return HOST_E_CLRNOTAVAILABLE;
}
if(!pwzAssemblyPath) //如果托管的DLL为空,返回
return E_POINTER;
if(argc < 0)//如果参数个数小于零,返回
{
return E_INVALIDARG;
}
if(argc > 0 && argv == NULL)//如果参数个数大于零且参数数组等于零,返回
{
return E_INVALIDARG;
}
HRESULT hr = S_OK; //初始化hr
AppDomain *pCurDomain = SystemDomain::GetCurrentDomain(); //获取到当前appdomain的实例
Thread *pThread = GetThread(); //获取到当前进程指针
if (pThread == NULL) //如果进程指针为零
{
pThread = SetupThreadNoThrow(&hr);
if (pThread == NULL)
{
goto ErrExit;
}
}
if(pCurDomain->GetId().m_dwId != DefaultADID)//如果当前进程的ID不等于defaultadid返回
{
return HOST_E_INVALIDOPERATION;
}
INSTALL_UNHANDLED_MANAGED_EXCEPTION_TRAP;
INSTALL_UNWIND_AND_CONTINUE_HANDLER;
_ASSERTE (!pThread->PreemptiveGCDisabled());
Assembly *pAssembly = AssemblySpec::LoadAssembly(pwzAssemblyPath); //加载传递过来的托管程序集,并且实例化
#if defined(FEATURE_MULTICOREJIT)
pCurDomain->GetMulticoreJitManager().AutoStartProfile(pCurDomain);
#endif // defined(FEATURE_MULTICOREJIT)
{
GCX_COOP();
// Here we call the managed method that gets the cmdLineArgs array.
SetCommandLineArgs(pwzAssemblyPath, argc, argv);//设置命令行参数
PTRARRAYREF arguments = NULL;
GCPROTECT_BEGIN(arguments);
arguments = (PTRARRAYREF)AllocateObjectArray(argc, g_pStringClass);//分配内存
for (int i = 0; i < argc; ++i)
{
STRINGREF argument = StringObject::NewString(argv[i]);//转换参数
arguments->SetAt(i, argument);//设置参数数组标记
}
DWORD retval = pAssembly->ExecuteMainMethod(&arguments, TRUE /*waitForOtherThreads */); //执行需要托管的method
if (pReturnValue) //如果返回标记不为空
{
*pReturnValue = retval;//赋值
}
GCPROTECT_END();
}
UNINSTALL_UNWIND_AND_CONTINUE_HANDLER;
UNINSTALL_UNHANDLED_MANAGED_EXCEPTION_TRAP;
ErrExit: //如果错误,调到errexit ,返回HR
return hr;
}
2.利用非托管加载程序集
Assembly *AssemblySpec::LoadAssembly(LPCWSTR pFilePath) // 传递托管程序集路径
{
CONTRACT(Assembly *)
{
THROWS;
GC_TRIGGERS;
MODE_ANY;
PRECONDITION(CheckPointer(pFilePath));
POSTCONDITION(CheckPointer(RETVAL));
INJECT_FAULT(COMPlusThrowOM(););
}
CONTRACT_END;
AssemblySpec spec; //初始化assemblyspec 类
spec.SetCodeBase(pFilePath); //设置类的托管程序集路径
RETURN spec.LoadAssembly(FILE_LOADED); //设置类的加载方式为 文件加载
}
DomainAssembly *AssemblySpec::LoadDomainAssembly(FileLoadLevel targetLevel, //加载方式,为文件加载,另外三个参数都为空
BOOL fThrowOnFileNotFound,
BOOL fRaisePrebindEvents,
StackCrawlMark *pCallerStackMark)
{
CONTRACT(DomainAssembly *)
{
INSTANCE_CHECK;
THROWS;
GC_TRIGGERS;
MODE_ANY;
POSTCONDITION((!fThrowOnFileNotFound && CheckPointer(RETVAL, NULL_OK))
|| CheckPointer(RETVAL));
INJECT_FAULT(COMPlusThrowOM(););
}
CONTRACT_END;
ETWOnStartup (LoaderCatchCall_V1, LoaderCatchCallEnd_V1); //初始化一些宏定义
AppDomain* pDomain = GetAppDomain(); //获取当前 appdomain 的实例
DomainAssembly *pAssembly = nullptr; //声明并赋值一个 domainassembly
ICLRPrivBinder * pBinder = GetHostBinder(); //获取到 iclrprivbinder 对象
// If no binder was explicitly set, check if parent assembly has a binder.
if (pBinder == nullptr) //如果 pbinder等于零
{
pBinder = GetBindingContextFromParentAssembly(pDomain); //获取到父类和注入的一些方法
}
if (pBinder != nullptr)//如果获取到了
{
ReleaseHolder<ICLRPrivAssembly> pPrivAssembly;
HRESULT hrCachedResult;
if (SUCCEEDED(pBinder->FindAssemblyBySpec(GetAppDomain(), this, &hrCachedResult, &pPrivAssembly)) &&
SUCCEEDED(hrCachedResult))//用pbinder找到appdomain 的pprivassembly
{
pAssembly = pDomain->FindAssembly(pPrivAssembly);//利用找到的pprivassembly,pdomain调用然后赋值给要返回的程序集
}
}
if ((pAssembly == nullptr) && CanUseWithBindingCache()) //如果为空
{
pAssembly = pDomain->FindCachedAssembly(this);//pdomain带上当前类的实例去缓存里面找当前的程序集
}
if (pAssembly)//如果找到
{
pDomain->LoadDomainFile(pAssembly, targetLevel); //以文件方式加载程序集
RETURN pAssembly; //然后返回
}
PEAssemblyHolder pFile(pDomain->BindAssemblySpec(this, fThrowOnFileNotFound, fRaisePrebindEvents, pCallerStackMark));//如果上面所有步骤都不行,实例化一个peassemblyholder,
if (pFile == NULL)
RETURN NULL;
pAssembly = pDomain->LoadDomainAssembly(this, pFile, targetLevel);//利用这个实例化的peassemblyholder和this指针,以及文件加载的方式去获取程序集
RETURN pAssembly; //返回程序集
}