在类库中使用ASP.NET Core API

解决办法1

官方文档

<Project Sdk="Microsoft.NET.Sdk">
	<PropertyGroup>
		<TargetFramework>netcoreapp3.1TargetFramework>
	PropertyGroup>
	<ItemGroup>
		<FrameworkReference Include="Microsoft.AspNetCore.App">FrameworkReference>
	ItemGroup>
Project>
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解决办法2

将类库修改为web项目，然后设置输出为类库形式即可

<Project Sdk="Microsoft.NET.Sdk.Web">
	<PropertyGroup>
		<TargetFramework>netcoreapp3.1TargetFramework>
		<OutputType>LibraryOutputType>
	PropertyGroup>
Project>
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