AppDomain.CurrentDomain.SetupInformation.TargetFrameworkName is null

Question

我做了一个C++调用C#的程序 EXE(C++) --> DLL(C#)
编译环境：VS2012，VS2019
DLL(C#)工程设定目标框架是 .NETFramework,Version=v4.8

调用接口如下：
CLRCreateInstance -> GetRuntime("v4.0.30319") ->GetInterface ->ExecuteInDefaultAppDomain ★
"v4.0.30319" 只是CLR版本，没有指定目标框架版本的参数。

接口正常动作，DLL(C#)程序正常启动。
但是，DLL(C#)中打印AppDomain.CurrentDomain.SetupInformation.TargetFrameworkName信息是发现为null，而不是预期的 .NETFramework,Version v4.8
对应的ServicePointManager.SecurityProtocol默认值为 Ssl3, Tls， 也不是预期的 SystemDefault

如果 EXE(C# v4.8) --> DLL(C#)的话，
DLL(C#)中 TargetFrameworkName和SecurityProtocol都是预期值。

我觉得原因在于 ★方式下， DLL(C#)没能按照设定的目标框架动作，而是启动了该CLR版本的最低.NETFramework
有解决办法吗？
我希望DLL(C#)按照预期目标框架动作。

English ==================================================================================================

I made a C++ EXE to call C# dll using VS2019.
C# dll 's target framework version is set to v4.8 in project property.
Call API is： CLRCreateInstance -> GetRuntime("v4.0.30319") ->GetInterface ->ExecuteInDefaultAppDomain ★
"v4.0.30319" is CLR vresion，it seems that there is no parameter to set target framework version.

C# dll is called ,
but in C# dll, AppDomain.CurrentDomain.SetupInformation.TargetFrameworkName is null , not v4.8.
and ServicePointManager.SecurityProtocol is Ssl3, Tls，not SystemDefault
Ref:
https://learn.microsoft.com/en-us/dotnet/api/system.net.servicepointmanager.securityprotocol?view=netframework-4.8

if c# exe(v4.8 ) call this c# dll, the value is all right.

I think the problem is ★'s way, C# dll can not start with target version.

i want AppDomain.CurrentDomain.SetupInformation.TargetFrameworkName = v4.8
and ServicePointManager.SecurityProtocol = SystemDefault
how to fix the problem?

Answer 1

Hi @liu juan ,

I successfully output the .NET version number in the main function. I created a CLR project and my C++/CLI version is 4.8. You could refer to my method.

#include "pch.h"  
using namespace ClassLibrary1;  
using namespace System;  
#include<iostream>  
int main(array<System::String ^> ^args)  
{  
Class1 c1;  
  
int a = c1.myprint();  
String ^ b = AppDomain::CurrentDomain->SetupInformation->TargetFrameworkName;  
Console::WriteLine(b);  
std::cout << "1";  
system("pause");  
//auto a = AppDomain.CurrentDomain.SetupInformation.TargetFrameworkName;  
// System.Console.WriteLine(a);  
return 0;  
}  

Best regards,

Elya

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