app.csproj

<Project Sdk="Microsoft.NET.Sdk.Web">
  <!-- This file helps VS Code provide IntelliSense - see https://go.2sxc.org/vscode -->

  <!-- Specify the default Namespace for C# code in this specific App -->
  <PropertyGroup>
    <RootNamespace>AppCode</RootNamespace>
  </PropertyGroup>

  <!-- First: Detect if it's running in Dnn, Oqtane-Production or Oqtane-Dev -->
  <PropertyGroup>
    <RunningInDnn Condition="Exists('..\..\..\..\bin\DotNetNuke.dll')">true</RunningInDnn>
    <RunningInOqtane Condition="Exists('..\..\..\Oqtane.Server.dll') Or Exists('..\..\..\bin\Debug\net8.0\Oqtane.Server.dll')">true</RunningInOqtane>
    <OqtaneIsProd Condition="Exists('..\..\..\Oqtane.Server.dll')">true</OqtaneIsProd>
    <OqtaneIsDev Condition="Exists('..\..\..\bin\Debug\net8.0\Oqtane.Server.dll')">true</OqtaneIsDev>
  </PropertyGroup>

  <!-- Settings for Dnn -->
  <PropertyGroup Condition="'$(RunningInDnn)' == 'true'">
    <!-- Specify .net 4.7.2, C# 8.0 and Bin folder for DNN - see https://go.2sxc.org/vscode -->
    <TargetFramework>net472</TargetFramework>
    <LangVersion>8.0</LangVersion>
    <PathBin>..\..\..\..\bin</PathBin>
  </PropertyGroup>
  
  <!-- Settings for Oqtane -->
  <PropertyGroup Condition="'$(RunningInOqtane)' == 'true'">
    <!-- Oqtane 5+ uses .net 8 and a very new C# language version -->
    <TargetFramework>net8.0</TargetFramework>
    <LangVersion>latest</LangVersion>

    <!-- PathBin Oqtane production, the bin folder is in the root, just up 3 folders, no bin-subfolder -->
    <PathBin Condition="'$(OqtaneIsProd)' == 'true'">..\..\..</PathBin>

    <!-- PathBin Oqtane dev/debug, the bin folder is deeper down, up 3 folders and current build folder -->
    <PathBin Condition="'$(OqtaneIsDev)' == 'true'">..\..\..\bin\Debug\net8.0</PathBin>
  </PropertyGroup>


  <!-- IntelliSense: Load all DLLs which exist in Dnn and Oqtane from the bin folder -->
  <ItemGroup>
    <Reference Include="$(PathBin)\ToSic.*.dll" />
    <Reference Include="$(PathBin)\Connect.Koi.dll" />
    <!-- Also load files in the Dependencies folder of the current App -->
    <Reference Include="Dependencies\*.dll" />
  </ItemGroup>

  <!-- IntelliSense: DNN specific -->
  <ItemGroup Condition="'$(RunningInDnn)' == 'true'">
    <!-- also add System.Web and DotNetNuke DLLs - useful when creating APIs, but be aware that it may make your code less hybrid -->
    <Reference Include="$(PathBin)\DotNetNuke.dll" />
    <Reference Include="$(PathBin)\DotNetNuke.*.dll" />
    <Reference Include="$(PathBin)\System.Web.Http.dll" />
    <Reference Include="$(PathBin)\System.Web.WebPages.dll" />

    <!-- System.Web is not in the DNN folder but in the .net Framework installed on the server -->
    <Reference Include="System.Web" />
  </ItemGroup>

  <!-- Polymorphism - if have files with the same classes confuse IntelliSense - see https://go.2sxc.org/vscode -->
  <!-- Example: exclude /live as we're always working on /staging -->
  <ItemGroup>
    <None Remove="live\**" />
    <Content Remove="live\**" />
    <Compile Remove="live\**" />
    <EmbeddedResource Remove="live\**" />
  </ItemGroup>

</Project>