问题
I started a ServiceStack ASP.NET Empty project in VS2019, as that was the closest thing I could find to what I wanted. The template is right on, but I want to run it in .NET Core.
However, the Target framework was set to .NET Framework 4.5, but I wanted it to be .NET Core 2.1+, and I cannot select it either:
I know that I have .NET Core installed, cause I have been developing a Blazor app also in VS2019, which is .NET Core.
I'd like to know what I am missing here.
---- EDIT ---- Here is the csproj file for the project containing the AppHost.cs
<?xml version="1.0" encoding="utf-8"?>
<Project ToolsVersion="12.0" DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
<Import Project="$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props" Condition="Exists('$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props')" />
<PropertyGroup>
<Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
<Platform Condition=" '$(Platform)' == '' ">AnyCPU</Platform>
<ProductVersion>
</ProductVersion>
<SchemaVersion>2.0</SchemaVersion>
<ProjectGuid>{4389B305-B381-4B50-B1A8-BBB5259A0524}</ProjectGuid>
<ProjectTypeGuids>{349c5851-65df-11da-9384-00065b846f21};{fae04ec0-301f-11d3-bf4b-00c04f79efbc}</ProjectTypeGuids>
<OutputType>Library</OutputType>
<AppDesignerFolder>Properties</AppDesignerFolder>
<RootNamespace>DrivingLicenseApi</RootNamespace>
<AssemblyName>DrivingLicenseApi</AssemblyName>
<TargetFrameworkVersion>v4.5</TargetFrameworkVersion>
<UseIISExpress>true</UseIISExpress>
<IISExpressSSLPort />
<IISExpressAnonymousAuthentication />
<IISExpressWindowsAuthentication />
<IISExpressUseClassicPipelineMode />
<SolutionDir Condition="$(SolutionDir) == '' Or $(SolutionDir) == '*Undefined*'">..\..\</SolutionDir>
<RestorePackages>true</RestorePackages>
<Use64BitIISExpress />
<UseGlobalApplicationHostFile />
</PropertyGroup>
<PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
<DebugSymbols>true</DebugSymbols>
<DebugType>full</DebugType>
<Optimize>false</Optimize>
<OutputPath>bin\</OutputPath>
<DefineConstants>DEBUG;TRACE</DefineConstants>
<ErrorReport>prompt</ErrorReport>
<WarningLevel>4</WarningLevel>
</PropertyGroup>
<PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
<DebugType>pdbonly</DebugType>
<Optimize>true</Optimize>
<OutputPath>bin\</OutputPath>
<DefineConstants>TRACE</DefineConstants>
<ErrorReport>prompt</ErrorReport>
<WarningLevel>4</WarningLevel>
</PropertyGroup>
<ItemGroup>
<Reference Include="Microsoft.CSharp" />
<Reference Include="ServiceStack, Version=5.0.0.0, Culture=neutral, PublicKeyToken=02c12cbda47e6587, processorArchitecture=MSIL">
<HintPath>..\..\packages\ServiceStack.5.6.0\lib\net45\ServiceStack.dll</HintPath>
</Reference>
<Reference Include="ServiceStack.Client, Version=5.0.0.0, Culture=neutral, PublicKeyToken=02c12cbda47e6587, processorArchitecture=MSIL">
<HintPath>..\..\packages\ServiceStack.Client.5.6.0\lib\net45\ServiceStack.Client.dll</HintPath>
</Reference>
<Reference Include="ServiceStack.Common, Version=5.0.0.0, Culture=neutral, PublicKeyToken=02c12cbda47e6587, processorArchitecture=MSIL">
<HintPath>..\..\packages\ServiceStack.Common.5.6.0\lib\net45\ServiceStack.Common.dll</HintPath>
</Reference>
<Reference Include="ServiceStack.Interfaces, Version=5.0.0.0, Culture=neutral, PublicKeyToken=02c12cbda47e6587, processorArchitecture=MSIL">
<HintPath>..\..\packages\ServiceStack.Interfaces.5.6.0\lib\net45\ServiceStack.Interfaces.dll</HintPath>
</Reference>
<Reference Include="ServiceStack.OrmLite, Version=5.0.0.0, Culture=neutral, PublicKeyToken=02c12cbda47e6587, processorArchitecture=MSIL">
<HintPath>..\..\packages\ServiceStack.OrmLite.5.6.0\lib\net45\ServiceStack.OrmLite.dll</HintPath>
</Reference>
<Reference Include="ServiceStack.Redis, Version=5.0.0.0, Culture=neutral, PublicKeyToken=02c12cbda47e6587, processorArchitecture=MSIL">
<HintPath>..\..\packages\ServiceStack.Redis.5.6.0\lib\net45\ServiceStack.Redis.dll</HintPath>
</Reference>
<Reference Include="ServiceStack.Server, Version=5.0.0.0, Culture=neutral, PublicKeyToken=02c12cbda47e6587, processorArchitecture=MSIL">
<HintPath>..\..\packages\ServiceStack.Server.5.6.0\lib\net45\ServiceStack.Server.dll</HintPath>
</Reference>
<Reference Include="ServiceStack.Text, Version=5.0.0.0, Culture=neutral, PublicKeyToken=02c12cbda47e6587, processorArchitecture=MSIL">
<HintPath>..\..\packages\ServiceStack.Text.5.6.0\lib\net45\ServiceStack.Text.dll</HintPath>
</Reference>
<Reference Include="System.Buffers, Version=4.0.3.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51, processorArchitecture=MSIL">
<HintPath>..\..\packages\System.Buffers.4.5.0\lib\netstandard1.1\System.Buffers.dll</HintPath>
</Reference>
<Reference Include="System.ComponentModel.DataAnnotations" />
<Reference Include="System" />
<Reference Include="System.Memory, Version=4.0.1.1, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51, processorArchitecture=MSIL">
<HintPath>..\..\packages\System.Memory.4.5.3\lib\netstandard1.1\System.Memory.dll</HintPath>
</Reference>
<Reference Include="System.Net" />
<Reference Include="System.Data" />
<Reference Include="System.Core" />
<Reference Include="System.Runtime.CompilerServices.Unsafe, Version=4.0.4.1, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a, processorArchitecture=MSIL">
<HintPath>..\..\packages\System.Runtime.CompilerServices.Unsafe.4.5.2\lib\netstandard1.0\System.Runtime.CompilerServices.Unsafe.dll</HintPath>
</Reference>
<Reference Include="System.ServiceModel" />
<Reference Include="System.Web" />
<Reference Include="System.Xml" />
<Reference Include="System.Configuration" />
</ItemGroup>
<ItemGroup>
<ProjectReference Include="..\DrivingLicenseApi.ServiceInterface\DrivingLicenseApi.ServiceInterface.csproj">
<Project>{801a0f89-d5f6-49a6-bcea-6624388c98a4}</Project>
<Name>DrivingLicenseApi.ServiceInterface</Name>
</ProjectReference>
<ProjectReference Include="..\DrivingLicenseApi.ServiceModel\DrivingLicenseApi.ServiceModel.csproj">
<Project>{53E82AC1-DD1D-4C66-B55F-F9F4ACFB2F40}</Project>
<Name>DrivingLicenseApi.ServiceModel</Name>
</ProjectReference>
</ItemGroup>
<ItemGroup>
<Content Include="packages.config" />
<None Include="Web.Debug.config">
<DependentUpon>Web.config</DependentUpon>
</None>
<None Include="Web.Release.config">
<DependentUpon>Web.config</DependentUpon>
</None>
</ItemGroup>
<ItemGroup>
<Content Include="Global.asax" />
<Content Include="Web.config" />
</ItemGroup>
<ItemGroup>
<Compile Include="AppHost.cs" />
<Compile Include="Global.asax.cs">
<DependentUpon>Global.asax</DependentUpon>
</Compile>
<Compile Include="Properties\AssemblyInfo.cs" />
</ItemGroup>
<PropertyGroup>
<VisualStudioVersion Condition="'$(VisualStudioVersion)' == ''">10.0</VisualStudioVersion>
<VSToolsPath Condition="'$(VSToolsPath)' == ''">$(MSBuildExtensionsPath32)\Microsoft\VisualStudio\v$(VisualStudioVersion)</VSToolsPath>
</PropertyGroup>
<Import Project="$(MSBuildBinPath)\Microsoft.CSharp.targets" />
<Import Project="$(VSToolsPath)\WebApplications\Microsoft.WebApplication.targets" Condition="'$(VSToolsPath)' != ''" />
<Import Project="$(MSBuildExtensionsPath32)\Microsoft\VisualStudio\v10.0\WebApplications\Microsoft.WebApplication.targets" Condition="false" />
<Import Project="$(SolutionDir)\.nuget\NuGet.targets" Condition="Exists('$(SolutionDir)\.nuget\NuGet.targets')" />
<ProjectExtensions>
<VisualStudio>
<FlavorProperties GUID="{349c5851-65df-11da-9384-00065b846f21}">
<WebProjectProperties>
<UseIIS>True</UseIIS>
<AutoAssignPort>True</AutoAssignPort>
<DevelopmentServerPort>51893</DevelopmentServerPort>
<DevelopmentServerVPath>/</DevelopmentServerVPath>
<IISUrl>http://localhost:51893/</IISUrl>
<NTLMAuthentication>False</NTLMAuthentication>
<UseCustomServer>False</UseCustomServer>
<CustomServerUrl>
</CustomServerUrl>
<SaveServerSettingsInUserFile>False</SaveServerSettingsInUserFile>
</WebProjectProperties>
</FlavorProperties>
</VisualStudio>
</ProjectExtensions>
<!-- To modify your build process, add your task inside one of the targets below and uncomment it.
Other similar extension points exist, see Microsoft.Common.targets.
<Target Name="BeforeBuild">
</Target>
<Target Name="AfterBuild">
</Target>
-->
</Project>
回答1:
ServiceStackVS VS.NET Extension only lets you create .NET Framework projects.
To create ASP.NET Core projects you need to use web new, e.g. to create an Empty ASP.NET Core project run:
$ web new web ProjectName
回答2:
Try to open your .csproj for editing and put netcoreapp2.1 as your target framework.
<Project Sdk="Microsoft.NET.Sdk.Web">
<PropertyGroup>
<TargetFramework>netcoreapp2.1</TargetFramework>
</PropertyGroup>
</Project>
Check what version of .NET Core is installed globally by running dotnet --version from your cmd.
来源：https://stackoverflow.com/questions/57510026/servicestack-and-aws-created-a-asp-net-empty-project-but-cannot-select-net-co