Latest 4.5.3.20211226 windows binding package breaks .NET Framework

[sdcb]

I saw this commit: 889c573 and this commit: 51fee5e switched from detect .NET Core into detect .NET Framework, however, this might buggy and actually failed in .NET Framework.

Because the tranditional-style .NET Framework projects is actually using TargetFrameworkVersion to identify .NET Framework version, instead of TargetFramework (latest line):

<?xml version="1.0" encoding="utf-8"?>
<Project ToolsVersion="15.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
	<PropertyGroup>
		<Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
		<Platform Condition=" '$(Platform)' == '' ">AnyCPU</Platform>
		<ProjectGuid>{9211D76F-6902-4B3E-81D5-8DC81EC730D1}</ProjectGuid>
		<OutputType>Exe</OutputType>
		<RootNamespace>ConsoleApp3</RootNamespace>
		<AssemblyName>ConsoleApp3</AssemblyName>
		<TargetFrameworkVersion>v4.7.2</TargetFrameworkVersion>

In your .prop file, you're using TargetFramework to detect .NET Framework version, in this case, it will be always empty, so OpenCvSharpExtern.dll cannot be linked:

未经处理的异常:  System.TypeInitializationException: “OpenCvSharp.Internal.NativeMethods”的类型初始值设定项引发异常。 ---> System.DllNotFoundException: 无法加载 DLL“OpenCvSharpExtern”: 找不到指定的模块。 (异常来自 HRESULT:0x8007007E)。
   在 OpenCvSharp.Internal.NativeMethods.redirectError(CvErrorCallback errCallback, IntPtr userdata, IntPtr& prevUserdata)
   在 OpenCvSharp.Internal.NativeMethods.LoadLibraries(IEnumerable`1 additionalPaths)
   在 OpenCvSharp.Internal.NativeMethods..cctor()
   --- 内部异常堆栈跟踪的结尾 ---
   在 OpenCvSharp.Internal.NativeMethods.imgcodecs_imdecode_vector(Byte* buf, Int32 bufLength, Int32 flags, IntPtr& returnValue)
   在 OpenCvSharp.Cv2.ImDecode(ReadOnlySpan`1 span, ImreadModes flags)
   在 OpenCvSharp.Cv2.ImDecode(Byte[] buf, ImreadModes flags)
   在 ConsoleApp3.Program.<Main>d__0.MoveNext() 位置 C:\Users\ZhouJie\source\repos\ConsoleApp3\ConsoleApp3\Program.cs:行号 31
--- 引发异常的上一位置中堆栈跟踪的末尾 ---
   在 System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   在 System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   在 System.Runtime.CompilerServices.TaskAwaiter.GetResult()
   在 ConsoleApp3.Program.<Main>(String[] args)

You can try it by adding this target text in .csproj file:

	<Target Name="BeforeBuild">
		<Message Text="TargetFrameworkVersion: $(TargetFrameworkVersion)" Importance="high"/>
		<Message Text="TargetFramework: $(TargetFramework)" Importance="high"/>
	</Target>

In my machine, it will output following texts:

已启动重新生成…
1>------ 已启动全部重新生成: 项目: ConsoleApp3, 配置: Debug Any CPU ------
1>  TargetFrameworkVersion: v4.7.2
1>  TargetFramework: 
1>  ConsoleApp3 -> C:\Users\ZhouJie\source\repos\ConsoleApp3\ConsoleApp3\bin\Debug\ConsoleApp3.exe
========== 全部重新生成: 成功 1 个，失败 0 个，跳过 0 个 ==========

I suggest change the .prop file into detecting by TargetFrameworkVersion.

[shimat]

Thank you 👍