[英]The type 'System.Object' is defined in an assembly that is not referenced. You must add a reference to assembly 'netstandard
我已经创建了一个 .NET 标准库 (2.0)，它正在调用一个 web 服务（在 .NET 框架中编写）。 当我调用 web 服务的方法时，出现以下错误。
Unable to generate a temporary class (result=1).
error CS0012: The type 'System.Object' is defined in an assembly that is not referenced. You must add a reference to assembly 'netstandard, Version=2.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51'.
error CS0012: The type 'System.Enum' is defined in an assembly that is not referenced. You must add a reference to assembly 'netstandard, Version=2.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51'.
我正在使用 VS 2019 Enterprise（版本 16.4.0）。
如果您可以控制 .netstandard 项目 - 使其多目标化以解决问题
<PropertyGroup>
<TargetFrameworks>netstandard2.0;net471</TargetFrameworks>
</PropertyGroup>
我混合了 .Net 4.7.1 和 .netstandard 2.0 项目 - 两者的混合类序列化失败并出现上述错误。 经过长时间的调查和不幸的解决方法后，我发现该线程揭示了根本原因。 微软将其关闭为“不会修复，使用多目标” https://github.com/do.net/runtime/issues/21373
“组件”类型是在未引用的程序集中定义的。 您必须添加对程序集“System.ComponentModel.Primitives”的引用
[英]The type 'Component' is defined in an assembly that is not referenced. You must add a reference to assembly 'System.ComponentModel.Primitives'
NSubstitute -3.x 'ValueType' 在未引用的程序集中定义。 您必须添加对程序集“netstandard”的引用，
[英]NSubstitute -3.x 'ValueType' is defined in an assembly that is not referenced. You must add a reference to assembly 'netstandard,
类型“ System.Data.Common.DbTransaction”在未引用的程序集中定义。 您必须添加对程序集的引用
[英]The type 'System.Data.Common.DbTransaction' is defined in an assembly that is not referenced. You must add a reference to assembly
System.IObserver'1 <T0> 在未引用的程序集中定义。 您必须添加对程序集的引用
[英]System.IObserver'1<T0> is defined in an assembly that is not referenced. You must add a reference to assembly
为什么我得到：“IThirdParty”类型是在未引用的程序集中定义的。 您必须添加对程序集“ThirdPartyAssembly”的引用吗？
[英]Why am I getting: The type 'IThirdParty' is defined in an assembly that is not referenced. You must add a reference to assembly 'ThirdPartyAssembly'?
“MarshalByRefObject”类型是在未引用的程序集中定义的。 您必须添加对程序集 'mscorlib, Version=4.0.0.0 的引用
[英]The type 'MarshalByRefObject' is defined in an assembly that is not referenced. You must add a reference to assembly 'mscorlib, Version=4.0.0.0
类型“ DbConnection”在未引用的程序集中定义。 我无法添加参考？
[英]The type 'DbConnection' is defined in an assembly that is not referenced. I cannot add the reference?
“IEnumerable <>”类型在未引用的程序集中定义。 System.Runtime
[英]The type 'IEnumerable<>' is defined in an assembly that is not referenced. System.Runtime
类型“ IReportServerCredentials”在未引用的程序集中定义。
[英]type 'IReportServerCredentials' is defined in an assembly that is not referenced.
类型'IAsyncOperationWithProgress <，>'在未引用的程序集中定义。
[英]The type 'IAsyncOperationWithProgress<,>' is defined in an assembly that is not referenced.
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