[开发工具]VSCode的omnisharp找不到net framework的问题，解决

[info]: OmniSharp.MSBuild.ProjectSystem
        Detecting projects in 'c:\Users\Downloads\Asn1Editor.WPF-master\Asn1Editor.sln'.
[info]: OmniSharp.MSBuild.ProjectManager
        Queue project update for 'c:\Users\Downloads\Asn1Editor.WPF-master\Asn1Editor\Asn1Editor.csproj'
[info]: OmniSharp.Script.ScriptProjectSystem
        Detecting CSX files in 'c:\Users\Downloads\Asn1Editor.WPF-master'.
[info]: OmniSharp.Script.ScriptProjectSystem
        Could not find any CSX files
[info]: OmniSharp.WorkspaceInitializer
        Configuration finished.
[info]: OmniSharp.Stdio.Host
        Omnisharp server running using Stdio at location 'c:\Users\Downloads\Asn1Editor.WPF-master' on host 7668.
[info]: OmniSharp.MSBuild.ProjectManager
        Loading project: c:\Users\Downloads\Asn1Editor.WPF-master\Asn1Editor\Asn1Editor.csproj
[fail]: OmniSharp.MSBuild.ProjectLoader
        The reference assemblies for .NETFramework,Version=v4.5 were not found. To resolve this, install the Developer Pack (SDK/Targeting Pack) for this framework version or retarget your application. You can download .NET Framework Developer Packs at https://aka.ms/msbuild/developerpacks
[warn]: OmniSharp.MSBuild.ProjectManager
        Failed to load project file 'c:\Users\Downloads\Asn1Editor.WPF-master\Asn1Editor\Asn1Editor.csproj'.
c:\Users\Downloads\Asn1Editor.WPF-master\Asn1Editor\Asn1Editor.csproj
c:\Users\.vscode\extensions\ms-dotnettools.csharp-1.23.12\.omnisharp\1.37.10\.msbuild\Current\Bin\Microsoft.Common.CurrentVersion.targets(1216,5): Error: The reference assemblies for .NETFramework,Version=v4.5 were not found. To resolve this, install the Developer Pack (SDK/Targeting Pack) for this framework version or retarget your application. You can download .NET Framework Developer Packs at https://aka.ms/msbuild/developerpacks

[fail]: OmniSharp.MSBuild.ProjectManager
        Attempted to update project that is not loaded: c:\Users\Downloads\Asn1Editor.WPF-master\Asn1Editor\Asn1Editor.csproj

使用omnisharp时出现了.netframework找不到的情况

环境是win10，已经默认安装了4.8的netframework，很奇怪为何cannot found这个系统安装的最新的framework呢？

具体报错如上面显示。去它指示的路径看c:\Users\.vscode\extensions\ms-dotnettools.csharp-1.23.12\.omnisharp\1.37.10\.msbuild\Current\Bin\Microsoft.Common.CurrentVersion.targets(1216,5)，看不懂。

怀疑最终问题是没有找到framework的路径，于是重新下载安装一个新的，当然网上有说win10因为已经安装了一个，版本低的安装不上，可以安装开发版本，试了一下，安装可以，但是路径设置到系统环境变量path之后，还是不行。

索性安装最新版本的

?可以看到它自动更新了系统变量，这个就是希望vscode能找到，最后在完成升级了vscode之后（有一篇文章介绍怎么最终实现win10的vscode更新，就是拷贝更新文件的问题），再重新安装了最新的.net SDK之后，重新启动之后，可以看到能执行dotnet --info了，也就是对vscode和omnisharp能找到它了，这样，对应的.csproj打不开的问题就不报了，是一个问题。

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