How to run T4 template in Blazor project on build - visual-studio

Question

I have a Blazor project with a T4 template I wrote for scaffolding some code automatically. It works great from within Visual Studio, but I have to modify & save the template to get it to run again (as documented and expected).
I also want to run the template when building the project, so instead of VS running the template, it has to be MSBuild. I went through a bunch of articles about the topic and it looks like I have to re-import the default targets, as explained here.
I added the following to the top of my .csproj file, and this is when things went south:
<Import Project="Sdk.targets" Sdk="Microsoft.NET.Sdk.Web" />
This is the error I'm getting:
The TargetFramework value 'netstandard2.1' was not recognized. It may
be misspelled. If not, then the TargetFrameworkIdentifier and/or
TargetFrameworkVersion properties must be specified
explicitly. TestProject C:\Program
Files\dotnet\sdk\3.1.401\Sdks\Microsoft.NET.Sdk\targets\Microsoft.NET.TargetFrameworkInference.targets 93
Full .csproj file:
<Project Sdk="Microsoft.NET.Sdk.Web">
<Import Project="Sdk.targets" Sdk="Microsoft.NET.Sdk.Web" />
<PropertyGroup>
<TargetFramework>netstandard2.1</TargetFramework>
<RazorLangVersion>3.0</RazorLangVersion>
</PropertyGroup>
<ItemGroup>
<PackageReference Include="Microsoft.AspNetCore.Components.WebAssembly" Version="3.2.1" />
<PackageReference Include="Microsoft.AspNetCore.Components.WebAssembly.Build" Version="3.2.1" PrivateAssets="all" />
<PackageReference Include="Microsoft.AspNetCore.Components.WebAssembly.DevServer" Version="3.2.1" PrivateAssets="all" />
<PackageReference Include="System.Net.Http.Json" Version="3.2.0" />
</ItemGroup>
</Project>
What am I missing/doing wrong?

Answer 1

You should note the info from the article:
Fortunately, there’s a workaround: you can import the default targets
file explicitly, and import the text templating targets after that:
Solution
You should import those targets after netstandard 2.1 node.
In my side, I use these:
<Project Sdk="Microsoft.NET.Sdk.Web">
<PropertyGroup>
<TargetFramework>netstandard2.1</TargetFramework>
<RazorLangVersion>3.0</RazorLangVersion>
</PropertyGroup>
<Import Project="Sdk.targets" Sdk="Microsoft.NET.Sdk.Web" />
<Import Project="$(VSToolsPath)\TextTemplating\Microsoft.TextTemplating.targets"/>
<ItemGroup>
<PackageReference Include="Microsoft.AspNetCore.Components.WebAssembly" Version="3.2.1"/>
<PackageReference Include="Microsoft.AspNetCore.Components.WebAssembly.Build"
Version="3.2.1" PrivateAssets="all" />
<PackageReference Include="Microsoft.AspNetCore.Components.WebAssembly.DevServer"
Version="3.2.1" PrivateAssets="all" />
<PackageReference Include="System.Net.Http.Json" Version="3.2.0"/>
</ItemGroup>
</Project>
Then,